<commit_before>//
//  BarLineChartViewBase.swift
//  Charts
//
//  Created by <NAME> on 4/3/15.
//
//  Copyright 2015 <NAME> & <NAME>
//  A port of MPAndroidChart for iOS
//  Licensed under Apache License 2.0
//
//  https://github.com/danielgindi/ios-charts
//

import Foundation
import CoreGraphics

#if !os(OSX)
    import UIKit
#endif

/// Base-class of LineChart, BarChart, ScatterChart and CandleStickChart.
public class BarLineChartViewBase: ChartViewBase, BarLineScatterCandleBubbleChartDataProvider, NSUIGestureRecognizerDelegate
{
    /// the maximum number of entries to which values will be drawn
    /// (entry numbers greater than this value will cause value-labels to disappear)
    internal var _maxVisibleValueCount = 100
    
    /// flag that indicates if auto scaling on the y axis is enabled
    private var _autoScaleMinMaxEnabled = false
    private var _autoScaleLastLowestVisibleXIndex: Int!
    private var _autoScaleLastHighestVisibleXIndex: Int!
    
    private var _pinchZoomEnabled = false
    private var _doubleTapToZoomEnabled = true
    private var _dragEnabled = true
    
    private var _scaleXEnabled = true
    private var _scaleYEnabled = true
    
    /// the color for the background of the chart-drawing area (everything behind the grid lines).
    public var gridBackgroundColor = NSUIColor(red: 240/255.0, green: 240/255.0, blue: 240/255.0, alpha: 1.0)
    
    public var borderColor = NSUIColor.blackColor()
    public var borderLineWidth: CGFloat = 1.0
    
    /// flag indicating if the grid background should be drawn or not
    public var drawGridBackgroundEnabled = false
    
    /// Sets drawing the borders rectangle to true. If this is enabled, there is no point drawing the axis-lines of x- and y-axis.
    public var drawBordersEnabled = false

    /// Sets the minimum offset (padding) around the chart, defaults to 10
    public var minOffset = CGFloat(10.0)
    
    /// Sets whether the chart should keep its position (zoom / scroll) after a rotation (orientation change)
    /// **default**: false
    public var keepPositionOnRotation: Bool = false
    
    /// the object representing the left y-axis
    internal var _leftAxis: ChartYAxis!
    
    /// the object representing the right y-axis
    internal var _rightAxis: ChartYAxis!

    internal var _leftYAxisRenderer: ChartYAxisRenderer!
    internal var _rightYAxisRenderer: ChartYAxisRenderer!
    
    internal var _leftAxisTransformer: ChartTransformer!
    internal var _rightAxisTransformer: ChartTransformer!
    
    internal var _xAxisRenderer: ChartXAxisRenderer!
    
    internal var _tapGestureRecognizer: NSUITapGestureRecognizer!
    internal var _doubleTapGestureRecognizer: NSUITapGestureRecognizer!
    #if !os(tvOS)
    internal var _pinchGestureRecognizer: NSUIPinchGestureRecognizer!
    #endif
    internal var _panGestureRecognizer: NSUIPanGestureRecognizer!
    
    /// flag that indicates if a custom viewport offset has been set
    private var _customViewPortEnabled = false
    
    public override init(frame: CGRect)
    {
        super.init(frame: frame)
    }
    
    public required init?(coder aDecoder: NSCoder)
    {
        super.init(coder: aDecoder)
    }
    
    deinit
    {
        stopDeceleration()
    }
    
    internal override func initialize()
    {
        super.initialize()
        
        _leftAxis = ChartYAxis(position: .Left)
        _rightAxis = ChartYAxis(position: .Right)
        
        _leftAxisTransformer = ChartTransformer(viewPortHandler: _viewPortHandler)
        _rightAxisTransformer = ChartTransformer(viewPortHandler: _viewPortHandler)
        
        _leftYAxisRenderer = ChartYAxisRenderer(viewPortHandler: _viewPortHandler, yAxis: _leftAxis, transformer: _leftAxisTransformer)
        _rightYAxisRenderer = ChartYAxisRenderer(viewPortHandler: _viewPortHandler, yAxis: _rightAxis, transformer: _rightAxisTransformer)
        
        _xAxisRenderer = ChartXAxisRenderer(viewPortHandler: _viewPortHandler, xAxis: _xAxis, transformer: _leftAxisTransformer)
        
        self.highlighter = ChartHighlighter(chart: self)
        
        _tapGestureRecognizer = NSUITapGestureRecognizer(target: self, action: #selector(BarLineChartViewBase.tapGestureRecognized(_:)))
        _doubleTapGestureRecognizer = NSUITapGestureRecognizer(target: self, action: #selector(BarLineChartViewBase.doubleTapGestureRecognized(_:)))
        _doubleTapGestureRecognizer.nsuiNumberOfTapsRequired = 2
        _panGestureRecognizer = NSUIPanGestureRecognizer(target: self, action: #selector(BarLineChartViewBase.panGestureRecognized(_:)))
        
        _panGestureRecognizer.delegate = self
        
        self.addGestureRecognizer(_tapGestureRecognizer)
        self.addGestureRecognizer(_doubleTapGestureRecognizer)
        self.addGestureRecognizer(_panGestureRecognizer)
        
        _doubleTapGestureRecognizer.enabled = _doubleTapToZoomEnabled
        _panGestureRecognizer.enabled = _dragEnabled

        #if !os(tvOS)
            _pinchGestureRecognizer = NSUIPinchGestureRecognizer(target: self, action: #selector(BarLineChartViewBase.pinchGestureRecognized(_:)))
            _pinchGestureRecognizer.delegate = self
            self.addGestureRecognizer(_pinchGestureRecognizer)
            _pinchGestureRecognizer.enabled = _pinchZoomEnabled || _scaleXEnabled || _scaleYEnabled
        #endif
    }
    
    public override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>)
    {
        // Saving current position of chart.
        var oldPoint: CGPoint?
        if (keepPositionOnRotation && (keyPath == "frame" || keyPath == "bounds"))
        {
            oldPoint = viewPortHandler.contentRect.origin
            getTransformer(.Left).pixelToValue(&oldPoint!)
        }
        
        // Superclass transforms chart.
        super.observeValueForKeyPath(keyPath, ofObject: object, change: change, context: context)
        
        // Restoring old position of chart
        if var newPoint = oldPoint where keepPositionOnRotation
        {
            getTransformer(.Left).pointValueToPixel(&newPoint)
            viewPortHandler.centerViewPort(pt: newPoint, chart: self)
        }
        else
        {
            viewPortHandler.refresh(newMatrix: viewPortHandler.touchMatrix, chart: self, invalidate: true)
        }
    }
    
    public override func drawRect(rect: CGRect)
    {
        super.drawRect(rect)
        
        if _data === nil
        {
            return
        }
        
        let optionalContext = NSUIGraphicsGetCurrentContext()
        guard let context = optionalContext else { return }
        
        calcModulus()
        
        if (_xAxisRenderer !== nil)
        {
            _xAxisRenderer!.calcXBounds(chart: self, xAxisModulus: _xAxis.axisLabelModulus)
        }
        if (renderer !== nil)
        {
            renderer!.calcXBounds(chart: self, xAxisModulus: _xAxis.axisLabelModulus)
        }

        // execute all drawing commands
        drawGridBackground(context: context)
        
        if (_leftAxis.isEnabled)
        {
            _leftYAxisRenderer?.computeAxis(yMin: _leftAxis._axisMinimum, yMax: _leftAxis._axisMaximum)
        }
        if (_rightAxis.isEnabled)
        {
            _rightYAxisRenderer?.computeAxis(yMin: _rightAxis._axisMinimum, yMax: _rightAxis._axisMaximum)
        }
        
        _xAxisRenderer?.renderAxisLine(context: context)
        _leftYAxisRenderer?.renderAxisLine(context: context)
        _rightYAxisRenderer?.renderAxisLine(context: context)

        if (_autoScaleMinMaxEnabled)
        {
            let lowestVisibleXIndex = self.lowestVisibleXIndex,
                highestVisibleXIndex = self.highestVisibleXIndex
            
            if (_autoScaleLastLowestVisibleXIndex == nil || _autoScaleLastLowestVisibleXIndex != lowestVisibleXIndex ||
                _autoScaleLastHighestVisibleXIndex == nil || _autoScaleLastHighestVisibleXIndex != highestVisibleXIndex)
            {
                calcMinMax()
                calculateOffsets()
                
                _autoScaleLastLowestVisibleXIndex = lowestVisibleXIndex
                _autoScaleLastHighestVisibleXIndex = highestVisibleXIndex
            }
        }
        
        // make sure the graph values and grid cannot be drawn outside the content-rect
        CGContextSaveGState(context)

        CGContextClipToRect(context, _viewPortHandler.contentRect)
        
        if (_xAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _xAxisRenderer?.renderLimitLines(context: context)
        }
        if (_leftAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _leftYAxisRenderer?.renderLimitLines(context: context)
        }
        if (_rightAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _rightYAxisRenderer?.renderLimitLines(context: context)
        }
        
        _xAxisRenderer?.renderGridLines(context: context)
        _leftYAxisRenderer?.renderGridLines(context: context)
        _rightYAxisRenderer?.renderGridLines(context: context)
        
        renderer?.drawData(context: context)
        
        if (!_xAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _xAxisRenderer?.renderLimitLines(context: context)
        }
        if (!_leftAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _leftYAxisRenderer?.renderLimitLines(context: context)
        }
        if (!_rightAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _rightYAxisRenderer?.renderLimitLines(context: context)
        }

        // if highlighting is enabled
        if (valuesToHighlight())
        {
            renderer?.drawHighlighted(context: context, indices: _indicesToHighlight)
        }

        // Removes clipping rectangle
        CGContextRestoreGState(context)
        
        renderer!.drawExtras(context: context)
        
        _xAxisRenderer.renderAxisLabels(context: context)
        _leftYAxisRenderer.renderAxisLabels(context: context)
        _rightYAxisRenderer.renderAxisLabels(context: context)

        renderer!.drawValues(context: context)

        _legendRenderer.renderLegend(context: context)
        // drawLegend()

        drawMarkers(context: context)

        drawDescription(context: context)
    }
    
    internal func prepareValuePxMatrix()
    {
        _rightAxisTransformer.prepareMatrixValuePx(chartXMin: _xAxis._axisMinimum, deltaX: CGFloat(xAxis.axisRange), deltaY: CGFloat(_rightAxis.axisRange), chartYMin: _rightAxis._axisMinimum)
        _leftAxisTransformer.prepareMatrixValuePx(chartXMin: xAxis._axisMinimum, deltaX: CGFloat(xAxis.axisRange), deltaY: CGFloat(_leftAxis.axisRange), chartYMin: _leftAxis._axisMinimum)
    }
    
    internal func prepareOffsetMatrix()
    {
        _rightAxisTransformer.prepareMatrixOffset(_rightAxis.isInverted)
        _leftAxisTransformer.prepareMatrixOffset(_leftAxis.isInverted)
    }
    
    public override func notifyDataSetChanged()
    {
        calcMinMax()
        
        _leftAxis?._defaultValueFormatter = _defaultValueFormatter
        _rightAxis?._defaultValueFormatter = _defaultValueFormatter
        
        _leftYAxisRenderer?.computeAxis(yMin: _leftAxis._axisMinimum, yMax: _leftAxis._axisMaximum)
        _rightYAxisRenderer?.computeAxis(yMin: _rightAxis._axisMinimum, yMax: _rightAxis._axisMaximum)
        
        if let data = _data
        {
            _xAxisRenderer?.computeAxis(xValAverageLength: data.xValAverageLength, xValues: data.xVals)

            if (_legend !== nil)
            {
                _legendRenderer?.computeLegend(data)
            }
        }
        
        calculateOffsets()
        
        setNeedsDisplay()
    }
    
    internal override func calcMinMax()
    {
        if (_autoScaleMinMaxEnabled)
        {
            _data?.calcMinMax(start: lowestVisibleXIndex, end: highestVisibleXIndex)
        }
        
        // calculate / set x-axis range
        _xAxis._axisMaximum = Double((_data?.xVals.count ?? 0) - 1)
        _xAxis.axisRange = .abs(_xAxis._axisMaximum - _xAxis._axisMinimum);
        
        // calculate axis range (min / max) according to provided data
        _leftAxis.calcMinMax(min: _data?.getYMin(.Left) ?? 0.0, max: _data?.getYMax(.Left) ?? 0.0)
        _rightAxis.calcMinMax(min: _data?.getYMin(.Right) ?? 0.0, max: _data?.getYMax(.Right) ?? 0.0)
    }
    
    internal override func calculateOffsets()
    {
        if (!_customViewPortEnabled)
        {
            var offsetLeft = CGFloat(0.0)
            var offsetRight = CGFloat(0.0)
            var offsetTop = CGFloat(0.0)
            var offsetBottom = CGFloat(0.0)
            
            // setup offsets for legend
            if (_legend !== nil && _legend.isEnabled)
            {
                if (_legend.position == .RightOfChart
                    || _legend.position == .RightOfChartCenter)
                {
                    offsetRight += min(_legend.neededWidth, _viewPortHandler.chartWidth * _legend.maxSizePercent) + _legend.xOffset * 2.0
                }
                if (_legend.position == .LeftOfChart
                    || _legend.position == .LeftOfChartCenter)
                {
                    offsetLeft += min(_legend.neededWidth, _viewPortHandler.chartWidth * _legend.maxSizePercent) + _legend.xOffset * 2.0
                }
                else if (_legend.position == .BelowChartLeft
                    || _legend.position == .BelowChartRight
                    || _legend.position == .BelowChartCenter)
                {
                    // It's possible that we do not need this offset anymore as it
                    //   is available through the extraOffsets, but changing it can mean
                    //   changing default visibility for existing apps.
                    let yOffset = _legend.textHeightMax
                    
                    offsetBottom += min(_legend.neededHeight + yOffset, _viewPortHandler.chartHeight * _legend.maxSizePercent)
                }
                else if (_legend.position == .AboveChartLeft
                    || _legend.position == .AboveChartRight
                    || _legend.position == .AboveChartCenter)
                {
                    // It's possible that we do not need this offset anymore as it
                    //   is available through the extraOffsets, but changing it can mean
                    //   changing default visibility for existing apps.
                    let yOffset = _legend.textHeightMax
                    
                    offsetTop += min(_legend.neededHeight + yOffset, _viewPortHandler.chartHeight * _legend.maxSizePercent)
                }
            }
            
            // offsets for y-labels
            if (leftAxis.needsOffset)
            {
                offsetLeft += leftAxis.requiredSize().width
            }
            
            if (rightAxis.needsOffset)
            {
                offsetRight += rightAxis.requiredSize().width
            }

            if (xAxis.isEnabled && xAxis.isDrawLabelsEnabled)
            {
                let xlabelheight = xAxis.labelRotatedHeight + xAxis.yOffset
                
                // offsets for x-labels
                if (xAxis.labelPosition == .Bottom)
                {
                    offsetBottom += xlabelheight
                }
                else if (xAxis.labelPosition == .Top)
                {
                    offsetTop += xlabelheight
                }
                else if (xAxis.labelPosition == .BothSided)
                {
                    offsetBottom += xlabelheight
                    offsetTop += xlabelheight
                }
            }
            
            offsetTop += self.extraTopOffset
            offsetRight += self.extraRightOffset
            offsetBottom += self.extraBottomOffset
            offsetLeft += self.extraLeftOffset

            _viewPortHandler.restrainViewPort(
                offsetLeft: max(self.minOffset, offsetLeft),
                offsetTop: max(self.minOffset, offsetTop),
                offsetRight: max(self.minOffset, offsetRight),
                offsetBottom: max(self.minOffset, offsetBottom))
        }
        
        prepareOffsetMatrix()
        prepareValuePxMatrix()
    }
   

    /// calculates the modulus for x-labels and grid
    internal func calcModulus()
    {
        if (_xAxis === nil || !_xAxis.isEnabled)
        {
            return
        }
        
        if (!_xAxis.isAxisModulusCustom)
        {
            _xAxis.axisLabelModulus = Int(ceil((CGFloat(_data?.xValCount ?? 0) * _xAxis.labelRotatedWidth) / (_viewPortHandler.contentWidth * _viewPortHandler.touchMatrix.a)))
        }
        
        if (_xAxis.axisLabelModulus < 1)
        {
            _xAxis.axisLabelModulus = 1
        }
    }
    
    public override func getMarkerPosition(entry e: ChartDataEntry, highlight: ChartHighlight) -> CGPoint
    {
        guard let data = _data else { return CGPointZero }

        let dataSetIndex = highlight.dataSetIndex
        var xPos = CGFloat(e.xIndex)
        var yPos = CGFloat(e.value)
        
        if (self.isKindOfClass(BarChartView))
        {
            let bd = _data as! BarChartData
            let space = bd.groupSpace
            let setCount = data.dataSetCount
            let i = e.xIndex
            
            if self is HorizontalBarChartView
            {
                // calculate the x-position, depending on datasetcount
                let y = CGFloat(i + i * (setCount - 1) + dataSetIndex) + space * CGFloat(i) + space / 2.0
                
                yPos = y
                
                if let entry = e as? BarChartDataEntry
                {
                    if entry.values != nil && highlight.range !== nil
                    {
                        xPos = CGFloat(highlight.range!.to)
                    }
                    else
                    {
                        xPos = CGFloat(e.value)
                    }
                }
            }
            else
            {
                let x = CGFloat(i + i * (setCount - 1) + dataSetIndex) + space * CGFloat(i) + space / 2.0
                
                xPos = x
                
                if let entry = e as? BarChartDataEntry
                {
                    if entry.values != nil && highlight.range !== nil
                    {
                        yPos = CGFloat(highlight.range!.to)
                    }
                    else
                    {
                        yPos = CGFloat(e.value)
                    }
                }
            }
        }
        
        // position of the marker depends on selected value index and value
        var pt = CGPoint(x: xPos, y: yPos * _animator.phaseY)
        
        getTransformer(data.getDataSetByIndex(dataSetIndex)!.axisDependency).pointValueToPixel(&pt)
        
        return pt
    }
    
    /// draws the grid background
    internal func drawGridBackground(context context: CGContext)
    {
        if (drawGridBackgroundEnabled || drawBordersEnabled)
        {
            CGContextSaveGState(context)
        }
        
        if (drawGridBackgroundEnabled)
        {
            // draw the grid background
            CGContextSetFillColorWithColor(context, gridBackgroundColor.CGColor)
            CGContextFillRect(context, _viewPortHandler.contentRect)
        }
        
        if (drawBordersEnabled)
        {
            CGContextSetLineWidth(context, borderLineWidth)
            CGContextSetStrokeColorWithColor(context, borderColor.CGColor)
            CGContextStrokeRect(context, _viewPortHandler.contentRect)
        }
        
        if (drawGridBackgroundEnabled || drawBordersEnabled)
        {
            CGContextRestoreGState(context)
        }
    }
    
    // MARK: - Gestures
    
    private enum GestureScaleAxis
    {
        case Both
        case X
        case Y
    }
    
    private var _isDragging = false
    private var _isScaling = false
    private var _gestureScaleAxis = GestureScaleAxis.Both
    private var _closestDataSetToTouch: IChartDataSet!
    private var _panGestureReachedEdge: Bool = false
    private weak var _outerScrollView: NSUIScrollView?
    
    private var _lastPanPoint = CGPoint() /// This is to prevent using setTranslation which resets velocity
    
    private var _decelerationLastTime: NSTimeInterval = 0.0
    private var _decelerationDisplayLink: NSUIDisplayLink!
    private var _decelerationVelocity = CGPoint()
    
    @objc private func tapGestureRecognized(recognizer: NSUITapGestureRecognizer)
    {
        if _data === nil
        {
            return
        }
        
        if (recognizer.state == NSUIGestureRecognizerState.Ended)
        {
            if !self.isHighLightPerTapEnabled { return }
            
            let h = getHighlightByTouchPoint(recognizer.locationInView(self))
            
            if (h === nil || h!.isEqual(self.lastHighlighted))
            {
                self.highlightValue(highlight: nil, callDelegate: true)
                self.lastHighlighted = nil
            }
            else
            {
                self.lastHighlighted = h
                self.highlightValue(highlight: h, callDelegate: true)
            }
        }
    }
    
    @objc private func doubleTapGestureRecognized(recognizer: NSUITapGestureRecognizer)
    {
        if _data === nil
        {
            return
        }
        
        if (recognizer.state == NSUIGestureRecognizerState.Ended)
        {
            if _data !== nil && _doubleTapToZoomEnabled
            {
                var location = recognizer.locationInView(self)
                location.x = location.x - _viewPortHandler.offsetLeft
                
                if (isAnyAxisInverted && _closestDataSetToTouch !== nil && getAxis(_closestDataSetToTouch.axisDependency).isInverted)
                {
                    location.y = -(location.y - _viewPortHandler.offsetTop)
                }
                else
                {
                    location.y = -(self.bounds.size.height - location.y - _viewPortHandler.offsetBottom)
                }
                
                self.zoom(isScaleXEnabled ? 1.4 : 1.0, scaleY: isScaleYEnabled ? 1.4 : 1.0, x: location.x, y: location.y)
            }
        }
    }
    
    #if !os(tvOS)
    @objc private func pinchGestureRecognized(recognizer: NSUIPinchGestureRecognizer)
    {
        if (recognizer.state == NSUIGestureRecognizerState.Began)
        {
            stopDeceleration()
            
            if _data !== nil && (_pinchZoomEnabled || _scaleXEnabled || _scaleYEnabled)
            {
                _isScaling = true
                
                if (_pinchZoomEnabled)
                {
                    _gestureScaleAxis = .Both
                }
                else
                {
                    let x = abs(recognizer.locationInView(self).x - recognizer.nsuiLocationOfTouch(1, inView: self).x)
                    let y = abs(recognizer.locationInView(self).y - recognizer.nsuiLocationOfTouch(1, inView: self).y)
                    
                    if (x > y)
                    {
                        _gestureScaleAxis = .X
                    }
                    else
                    {
                        _gestureScaleAxis = .Y
                    }
                }
            }
        }
        else if (recognizer.state == NSUIGestureRecognizerState.Ended ||
            recognizer.state == NSUIGestureRecognizerState.Cancelled)
        {
            if (_isScaling)
            {
                _isScaling = false
                
                // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
                calculateOffsets()
                setNeedsDisplay()
            }
        }
        else if (recognizer.state == NSUIGestureRecognizerState.Changed)
        {
            let isZoomingOut = (recognizer.nsuiScale < 1)
            var canZoomMoreX = isZoomingOut ? _viewPortHandler.canZoomOutMoreX : _viewPortHandler.canZoomInMoreX
            var canZoomMoreY = isZoomingOut ? _viewPortHandler.canZoomOutMoreY : _viewPortHandler.canZoomInMoreY
            
            if (_isScaling)
            {
                canZoomMoreX = canZoomMoreX && _scaleXEnabled && (_gestureScaleAxis == .Both || _gestureScaleAxis == .X);
                canZoomMoreY = canZoomMoreY && _scaleYEnabled && (_gestureScaleAxis == .Both || _gestureScaleAxis == .Y);
                if canZoomMoreX || canZoomMoreY
                {
                    var location = recognizer.locationInView(self)
                    location.x = location.x - _viewPortHandler.offsetLeft

                    if (isAnyAxisInverted && _closestDataSetToTouch !== nil && getAxis(_closestDataSetToTouch.axisDependency).isInverted)
                    {
                        location.y = -(location.y - _viewPortHandler.offsetTop)
                    }
                    else
                    {
                        location.y = -(_viewPortHandler.chartHeight - location.y - _viewPortHandler.offsetBottom)
                    }
                    
                    let scaleX = canZoomMoreX ? recognizer.nsuiScale : 1.0
                    let scaleY = canZoomMoreY ? recognizer.nsuiScale : 1.0
                    
                    var matrix = CGAffineTransformMakeTranslation(location.x, location.y)
                    matrix = CGAffineTransformScale(matrix, scaleX, scaleY)
                    matrix = CGAffineTransformTranslate(matrix,
                        -location.x, -location.y)
                    
                    matrix = CGAffineTransformConcat(_viewPortHandler.touchMatrix, matrix)
                    
                    _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: true)
                    
                    if (delegate !== nil)
                    {
                        delegate?.chartScaled?(self, scaleX: scaleX, scaleY: scaleY)
                    }
                }
                
                recognizer.nsuiScale = 1.0
            }
        }
    }
    #endif
    
    @objc private func panGestureRecognized(recognizer: NSUIPanGestureRecognizer)
    {
        if (recognizer.state == NSUIGestureRecognizerState.Began && recognizer.nsuiNumberOfTouches() > 0)
        {
            stopDeceleration()
            
            if _data === nil
            { // If we have no data, we have nothing to pan and no data to highlight
                return;
            }
            
            // If drag is enabled and we are in a position where there's something to drag:
            //  * If we're zoomed in, then obviously we have something to drag.
            //  * If we have a drag offset - we always have something to drag
            if self.isDragEnabled &&
                (!self.hasNoDragOffset || !self.isFullyZoomedOut)
            {
                _isDragging = true
                
                _closestDataSetToTouch = getDataSetByTouchPoint(recognizer.nsuiLocationOfTouch(0, inView: self))
                
                let translation = recognizer.translationInView(self)
                let didUserDrag = (self is HorizontalBarChartView) ? translation.y != 0.0 : translation.x != 0.0
                
                // Check to see if user dragged at all and if so, can the chart be dragged by the given amount
                if (didUserDrag && !performPanChange(translation: translation))
                {
                    if (_outerScrollView !== nil)
                    {
                        // We can stop dragging right now, and let the scroll view take control
                        _outerScrollView = nil
                        _isDragging = false
                    }
                }
                else
                {
                    if (_outerScrollView !== nil)
                    {
                        // Prevent the parent scroll view from scrolling
                        _outerScrollView?.scrollEnabled = false
                    }
                }
                
                _lastPanPoint = recognizer.translationInView(self)
            }
            else if self.isHighlightPerDragEnabled
            {
                // We will only handle highlights on NSUIGestureRecognizerState.Changed
                
                _isDragging = false
            }
        }
        else if (recognizer.state == NSUIGestureRecognizerState.Changed)
        {
            if (_isDragging)
            {
                let originalTranslation = recognizer.translationInView(self)
                let translation = CGPoint(x: originalTranslation.x - _lastPanPoint.x, y: originalTranslation.y - _lastPanPoint.y)
                
                performPanChange(translation: translation)
                
                _lastPanPoint = originalTranslation
            }
            else if (isHighlightPerDragEnabled)
            {
                let h = getHighlightByTouchPoint(recognizer.locationInView(self))
                
                let lastHighlighted = self.lastHighlighted
                
                if ((h === nil && lastHighlighted !== nil) ||
                    (h !== nil && lastHighlighted === nil) ||
                    (h !== nil && lastHighlighted !== nil && !h!.isEqual(lastHighlighted)))
                {
                    self.lastHighlighted = h
                    self.highlightValue(highlight: h, callDelegate: true)
                }
            }
        }
        else if (recognizer.state == NSUIGestureRecognizerState.Ended || recognizer.state == NSUIGestureRecognizerState.Cancelled)
        {
            if (_isDragging)
            {
                if (recognizer.state == NSUIGestureRecognizerState.Ended && isDragDecelerationEnabled)
                {
                    stopDeceleration()
                    
                    _decelerationLastTime = CACurrentMediaTime()
                    _decelerationVelocity = recognizer.velocityInView(self)
                    
                    _decelerationDisplayLink = NSUIDisplayLink(target: self, selector: #selector(BarLineChartViewBase.decelerationLoop))
                    _decelerationDisplayLink.addToRunLoop(NSRunLoop.mainRunLoop(), forMode: NSRunLoopCommonModes)
                }
                
                _isDragging = false
            }
            
            if (_outerScrollView !== nil)
            {
                _outerScrollView?.scrollEnabled = true
                _outerScrollView = nil
            }
        }
    }
    
    private func performPanChange(translation translation: CGPoint) -> Bool
    {
        var translation = translation
        
        if (isAnyAxisInverted && _closestDataSetToTouch !== nil
            && getAxis(_closestDataSetToTouch.axisDependency).isInverted)
        {
            if (self is HorizontalBarChartView)
            {
                translation.x = -translation.x
            }
            else
            {
                translation.y = -translation.y
            }
        }
        
        let originalMatrix = _viewPortHandler.touchMatrix
        
        var matrix = CGAffineTransformMakeTranslation(translation.x, translation.y)
        matrix = CGAffineTransformConcat(originalMatrix, matrix)
        
        matrix = _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: true)
        
        if (delegate !== nil)
        {
            delegate?.chartTranslated?(self, dX: translation.x, dY: translation.y)
        }
        
        // Did we managed to actually drag or did we reach the edge?
        return matrix.tx != originalMatrix.tx || matrix.ty != originalMatrix.ty
    }
    
    public func stopDeceleration()
    {
        if (_decelerationDisplayLink !== nil)
        {
            _decelerationDisplayLink.removeFromRunLoop(NSRunLoop.mainRunLoop(), forMode: NSRunLoopCommonModes)
            _decelerationDisplayLink = nil
        }
    }
    
    @objc private func decelerationLoop()
    {
        let currentTime = CACurrentMediaTime()
        
        _decelerationVelocity.x *= self.dragDecelerationFrictionCoef
        _decelerationVelocity.y *= self.dragDecelerationFrictionCoef
        
        let timeInterval = CGFloat(currentTime - _decelerationLastTime)
        
        let distance = CGPoint(
            x: _decelerationVelocity.x * timeInterval,
            y: _decelerationVelocity.y * timeInterval
        )
        
        if (!performPanChange(translation: distance))
        {
            // We reached the edge, stop
            _decelerationVelocity.x = 0.0
            _decelerationVelocity.y = 0.0
        }
        
        _decelerationLastTime = currentTime
        
        if (abs(_decelerationVelocity.x) < 0.001 && abs(_decelerationVelocity.y) < 0.001)
        {
            stopDeceleration()
            
            // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
            calculateOffsets()
            setNeedsDisplay()
        }
    }
    
    private func nsuiGestureRecognizerShouldBegin(gestureRecognizer: NSUIGestureRecognizer) -> Bool
    {
        if (gestureRecognizer == _panGestureRecognizer)
        {
            if _data === nil || !_dragEnabled ||
                (self.hasNoDragOffset && self.isFullyZoomedOut && !self.isHighlightPerDragEnabled)
            {
                return false
            }
        }
        else
        {
            #if !os(tvOS)
                if (gestureRecognizer == _pinchGestureRecognizer)
                {
                    if _data === nil || (!_pinchZoomEnabled && !_scaleXEnabled && !_scaleYEnabled)
                    {
                        return false
                    }
                }
            #endif
        }
        
        return true
    }
    
    #if !os(OSX)
    public override func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool
    {
        if (!super.gestureRecognizerShouldBegin(gestureRecognizer))
        {
            return false
        }
        
        return nsuiGestureRecognizerShouldBegin(gestureRecognizer)
    }
    #endif
    
    #if os(OSX)
    public func gestureRecognizerShouldBegin(gestureRecognizer: NSGestureRecognizer) -> Bool
    {
        return nsuiGestureRecognizerShouldBegin(gestureRecognizer)
    }
    #endif
    
    public func gestureRecognizer(gestureRecognizer: NSUIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: NSUIGestureRecognizer) -> Bool
    {
        #if !os(tvOS)
        if ((gestureRecognizer.isKindOfClass(NSUIPinchGestureRecognizer) &&
            otherGestureRecognizer.isKindOfClass(NSUIPanGestureRecognizer)) ||
            (gestureRecognizer.isKindOfClass(NSUIPanGestureRecognizer) &&
                otherGestureRecognizer.isKindOfClass(NSUIPinchGestureRecognizer)))
        {
            return true
        }
        #endif
        
        if (gestureRecognizer.isKindOfClass(NSUIPanGestureRecognizer) &&
            otherGestureRecognizer.isKindOfClass(NSUIPanGestureRecognizer) && (
                gestureRecognizer == _panGestureRecognizer
            ))
        {
            var scrollView = self.superview
            while (scrollView !== nil && !scrollView!.isKindOfClass(NSUIScrollView))
            {
                scrollView = scrollView?.superview
            }
            
            // If there is two scrollview together, we pick the superview of the inner scrollview.
            // In the case of UITableViewWrepperView, the superview will be UITableView
            if let superViewOfScrollView = scrollView?.superview where superViewOfScrollView.isKindOfClass(NSUIScrollView)
            {
                scrollView = superViewOfScrollView
            }

            var foundScrollView = scrollView as? NSUIScrollView
            
            if (foundScrollView !== nil && !foundScrollView!.scrollEnabled)
            {
                foundScrollView = nil
            }
            
            var scrollViewPanGestureRecognizer: NSUIGestureRecognizer!
            
            if (foundScrollView !== nil)
            {
                for scrollRecognizer in foundScrollView!.nsuiGestureRecognizers!
                {
                    if (scrollRecognizer.isKindOfClass(NSUIPanGestureRecognizer))
                    {
                        scrollViewPanGestureRecognizer = scrollRecognizer as! NSUIPanGestureRecognizer
                        break
                    }
                }
            }
            
            if (otherGestureRecognizer === scrollViewPanGestureRecognizer)
            {
                _outerScrollView = foundScrollView
                
                return true
            }
        }
        
        return false
    }
    
    /// MARK: Viewport modifiers
    
    /// Zooms in by 1.4, into the charts center. center.
    public func zoomIn()
    {
        let center = _viewPortHandler.contentCenter
        
        let matrix = _viewPortHandler.zoomIn(x: center.x, y: -center.y)
        _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: false)
        
        // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
        calculateOffsets()
        setNeedsDisplay()
    }

    /// Zooms out by 0.7, from the charts center. center.
    public func zoomOut()
    {
        let center = _viewPortHandler.contentCenter
        
        let matrix = _viewPortHandler.zoomOut(x: center.x, y: -center.y)
        _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: false)

        // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
        calculateOffsets()
        setNeedsDisplay()
    }

    /// Zooms in or out by the given scale factor. x and y are the coordinates
    /// (in pixels) of the zoom center.
    ///
    /// - parameter scaleX: if < 1 --> zoom out, if > 1 --> zoom in
    /// - parameter scaleY: if < 1 --> zoom out, if > 1 --> zoom in
    /// - parameter x:
    /// - parameter y:
    public func zoom(scaleX: CGFloat, scaleY: CGFloat, x: CGFloat, y: CGFloat)
    {
        let matrix = _viewPortHandler.zoom(scaleX: scaleX, scaleY: scaleY, x: x, y: -y)
        _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: false)
        
        // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
        calculateOffsets()
        setNeedsDisplay()
    }

    /// Zooms in or out by the given scale factor.
    /// x and y are the values (**not pixels**) which to zoom to or from (the values of the zoom center).
    ///
    /// - parameter scaleX: if < 1 --> zoom out, if > 1 --> zoom in
    /// - parameter scaleY: if < 1 --> zoom out, if > 1 --> zoom in
    /// - parameter xIndex:
    /// - parameter yValue:<commit_msg>Fix for the old zoom method<commit_after>//
//  BarLineChartViewBase.swift
//  Charts
//
//  Created by <NAME> on 4/3/15.
//
//  Copyright 2015 <NAME> & <NAME>
//  A port of MPAndroidChart for iOS
//  Licensed under Apache License 2.0
//
//  https://github.com/danielgindi/ios-charts
//

import Foundation
import CoreGraphics

#if !os(OSX)
    import UIKit
#endif

/// Base-class of LineChart, BarChart, ScatterChart and CandleStickChart.
public class BarLineChartViewBase: ChartViewBase, BarLineScatterCandleBubbleChartDataProvider, NSUIGestureRecognizerDelegate
{
    /// the maximum number of entries to which values will be drawn
    /// (entry numbers greater than this value will cause value-labels to disappear)
    internal var _maxVisibleValueCount = 100
    
    /// flag that indicates if auto scaling on the y axis is enabled
    private var _autoScaleMinMaxEnabled = false
    private var _autoScaleLastLowestVisibleXIndex: Int!
    private var _autoScaleLastHighestVisibleXIndex: Int!
    
    private var _pinchZoomEnabled = false
    private var _doubleTapToZoomEnabled = true
    private var _dragEnabled = true
    
    private var _scaleXEnabled = true
    private var _scaleYEnabled = true
    
    /// the color for the background of the chart-drawing area (everything behind the grid lines).
    public var gridBackgroundColor = NSUIColor(red: 240/255.0, green: 240/255.0, blue: 240/255.0, alpha: 1.0)
    
    public var borderColor = NSUIColor.blackColor()
    public var borderLineWidth: CGFloat = 1.0
    
    /// flag indicating if the grid background should be drawn or not
    public var drawGridBackgroundEnabled = false
    
    /// Sets drawing the borders rectangle to true. If this is enabled, there is no point drawing the axis-lines of x- and y-axis.
    public var drawBordersEnabled = false

    /// Sets the minimum offset (padding) around the chart, defaults to 10
    public var minOffset = CGFloat(10.0)
    
    /// Sets whether the chart should keep its position (zoom / scroll) after a rotation (orientation change)
    /// **default**: false
    public var keepPositionOnRotation: Bool = false
    
    /// the object representing the left y-axis
    internal var _leftAxis: ChartYAxis!
    
    /// the object representing the right y-axis
    internal var _rightAxis: ChartYAxis!

    internal var _leftYAxisRenderer: ChartYAxisRenderer!
    internal var _rightYAxisRenderer: ChartYAxisRenderer!
    
    internal var _leftAxisTransformer: ChartTransformer!
    internal var _rightAxisTransformer: ChartTransformer!
    
    internal var _xAxisRenderer: ChartXAxisRenderer!
    
    internal var _tapGestureRecognizer: NSUITapGestureRecognizer!
    internal var _doubleTapGestureRecognizer: NSUITapGestureRecognizer!
    #if !os(tvOS)
    internal var _pinchGestureRecognizer: NSUIPinchGestureRecognizer!
    #endif
    internal var _panGestureRecognizer: NSUIPanGestureRecognizer!
    
    /// flag that indicates if a custom viewport offset has been set
    private var _customViewPortEnabled = false
    
    public override init(frame: CGRect)
    {
        super.init(frame: frame)
    }
    
    public required init?(coder aDecoder: NSCoder)
    {
        super.init(coder: aDecoder)
    }
    
    deinit
    {
        stopDeceleration()
    }
    
    internal override func initialize()
    {
        super.initialize()
        
        _leftAxis = ChartYAxis(position: .Left)
        _rightAxis = ChartYAxis(position: .Right)
        
        _leftAxisTransformer = ChartTransformer(viewPortHandler: _viewPortHandler)
        _rightAxisTransformer = ChartTransformer(viewPortHandler: _viewPortHandler)
        
        _leftYAxisRenderer = ChartYAxisRenderer(viewPortHandler: _viewPortHandler, yAxis: _leftAxis, transformer: _leftAxisTransformer)
        _rightYAxisRenderer = ChartYAxisRenderer(viewPortHandler: _viewPortHandler, yAxis: _rightAxis, transformer: _rightAxisTransformer)
        
        _xAxisRenderer = ChartXAxisRenderer(viewPortHandler: _viewPortHandler, xAxis: _xAxis, transformer: _leftAxisTransformer)
        
        self.highlighter = ChartHighlighter(chart: self)
        
        _tapGestureRecognizer = NSUITapGestureRecognizer(target: self, action: #selector(BarLineChartViewBase.tapGestureRecognized(_:)))
        _doubleTapGestureRecognizer = NSUITapGestureRecognizer(target: self, action: #selector(BarLineChartViewBase.doubleTapGestureRecognized(_:)))
        _doubleTapGestureRecognizer.nsuiNumberOfTapsRequired = 2
        _panGestureRecognizer = NSUIPanGestureRecognizer(target: self, action: #selector(BarLineChartViewBase.panGestureRecognized(_:)))
        
        _panGestureRecognizer.delegate = self
        
        self.addGestureRecognizer(_tapGestureRecognizer)
        self.addGestureRecognizer(_doubleTapGestureRecognizer)
        self.addGestureRecognizer(_panGestureRecognizer)
        
        _doubleTapGestureRecognizer.enabled = _doubleTapToZoomEnabled
        _panGestureRecognizer.enabled = _dragEnabled

        #if !os(tvOS)
            _pinchGestureRecognizer = NSUIPinchGestureRecognizer(target: self, action: #selector(BarLineChartViewBase.pinchGestureRecognized(_:)))
            _pinchGestureRecognizer.delegate = self
            self.addGestureRecognizer(_pinchGestureRecognizer)
            _pinchGestureRecognizer.enabled = _pinchZoomEnabled || _scaleXEnabled || _scaleYEnabled
        #endif
    }
    
    public override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>)
    {
        // Saving current position of chart.
        var oldPoint: CGPoint?
        if (keepPositionOnRotation && (keyPath == "frame" || keyPath == "bounds"))
        {
            oldPoint = viewPortHandler.contentRect.origin
            getTransformer(.Left).pixelToValue(&oldPoint!)
        }
        
        // Superclass transforms chart.
        super.observeValueForKeyPath(keyPath, ofObject: object, change: change, context: context)
        
        // Restoring old position of chart
        if var newPoint = oldPoint where keepPositionOnRotation
        {
            getTransformer(.Left).pointValueToPixel(&newPoint)
            viewPortHandler.centerViewPort(pt: newPoint, chart: self)
        }
        else
        {
            viewPortHandler.refresh(newMatrix: viewPortHandler.touchMatrix, chart: self, invalidate: true)
        }
    }
    
    public override func drawRect(rect: CGRect)
    {
        super.drawRect(rect)
        
        if _data === nil
        {
            return
        }
        
        let optionalContext = NSUIGraphicsGetCurrentContext()
        guard let context = optionalContext else { return }
        
        calcModulus()
        
        if (_xAxisRenderer !== nil)
        {
            _xAxisRenderer!.calcXBounds(chart: self, xAxisModulus: _xAxis.axisLabelModulus)
        }
        if (renderer !== nil)
        {
            renderer!.calcXBounds(chart: self, xAxisModulus: _xAxis.axisLabelModulus)
        }

        // execute all drawing commands
        drawGridBackground(context: context)
        
        if (_leftAxis.isEnabled)
        {
            _leftYAxisRenderer?.computeAxis(yMin: _leftAxis._axisMinimum, yMax: _leftAxis._axisMaximum)
        }
        if (_rightAxis.isEnabled)
        {
            _rightYAxisRenderer?.computeAxis(yMin: _rightAxis._axisMinimum, yMax: _rightAxis._axisMaximum)
        }
        
        _xAxisRenderer?.renderAxisLine(context: context)
        _leftYAxisRenderer?.renderAxisLine(context: context)
        _rightYAxisRenderer?.renderAxisLine(context: context)

        if (_autoScaleMinMaxEnabled)
        {
            let lowestVisibleXIndex = self.lowestVisibleXIndex,
                highestVisibleXIndex = self.highestVisibleXIndex
            
            if (_autoScaleLastLowestVisibleXIndex == nil || _autoScaleLastLowestVisibleXIndex != lowestVisibleXIndex ||
                _autoScaleLastHighestVisibleXIndex == nil || _autoScaleLastHighestVisibleXIndex != highestVisibleXIndex)
            {
                calcMinMax()
                calculateOffsets()
                
                _autoScaleLastLowestVisibleXIndex = lowestVisibleXIndex
                _autoScaleLastHighestVisibleXIndex = highestVisibleXIndex
            }
        }
        
        // make sure the graph values and grid cannot be drawn outside the content-rect
        CGContextSaveGState(context)

        CGContextClipToRect(context, _viewPortHandler.contentRect)
        
        if (_xAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _xAxisRenderer?.renderLimitLines(context: context)
        }
        if (_leftAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _leftYAxisRenderer?.renderLimitLines(context: context)
        }
        if (_rightAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _rightYAxisRenderer?.renderLimitLines(context: context)
        }
        
        _xAxisRenderer?.renderGridLines(context: context)
        _leftYAxisRenderer?.renderGridLines(context: context)
        _rightYAxisRenderer?.renderGridLines(context: context)
        
        renderer?.drawData(context: context)
        
        if (!_xAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _xAxisRenderer?.renderLimitLines(context: context)
        }
        if (!_leftAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _leftYAxisRenderer?.renderLimitLines(context: context)
        }
        if (!_rightAxis.isDrawLimitLinesBehindDataEnabled)
        {
            _rightYAxisRenderer?.renderLimitLines(context: context)
        }

        // if highlighting is enabled
        if (valuesToHighlight())
        {
            renderer?.drawHighlighted(context: context, indices: _indicesToHighlight)
        }

        // Removes clipping rectangle
        CGContextRestoreGState(context)
        
        renderer!.drawExtras(context: context)
        
        _xAxisRenderer.renderAxisLabels(context: context)
        _leftYAxisRenderer.renderAxisLabels(context: context)
        _rightYAxisRenderer.renderAxisLabels(context: context)

        renderer!.drawValues(context: context)

        _legendRenderer.renderLegend(context: context)
        // drawLegend()

        drawMarkers(context: context)

        drawDescription(context: context)
    }
    
    internal func prepareValuePxMatrix()
    {
        _rightAxisTransformer.prepareMatrixValuePx(chartXMin: _xAxis._axisMinimum, deltaX: CGFloat(xAxis.axisRange), deltaY: CGFloat(_rightAxis.axisRange), chartYMin: _rightAxis._axisMinimum)
        _leftAxisTransformer.prepareMatrixValuePx(chartXMin: xAxis._axisMinimum, deltaX: CGFloat(xAxis.axisRange), deltaY: CGFloat(_leftAxis.axisRange), chartYMin: _leftAxis._axisMinimum)
    }
    
    internal func prepareOffsetMatrix()
    {
        _rightAxisTransformer.prepareMatrixOffset(_rightAxis.isInverted)
        _leftAxisTransformer.prepareMatrixOffset(_leftAxis.isInverted)
    }
    
    public override func notifyDataSetChanged()
    {
        calcMinMax()
        
        _leftAxis?._defaultValueFormatter = _defaultValueFormatter
        _rightAxis?._defaultValueFormatter = _defaultValueFormatter
        
        _leftYAxisRenderer?.computeAxis(yMin: _leftAxis._axisMinimum, yMax: _leftAxis._axisMaximum)
        _rightYAxisRenderer?.computeAxis(yMin: _rightAxis._axisMinimum, yMax: _rightAxis._axisMaximum)
        
        if let data = _data
        {
            _xAxisRenderer?.computeAxis(xValAverageLength: data.xValAverageLength, xValues: data.xVals)

            if (_legend !== nil)
            {
                _legendRenderer?.computeLegend(data)
            }
        }
        
        calculateOffsets()
        
        setNeedsDisplay()
    }
    
    internal override func calcMinMax()
    {
        if (_autoScaleMinMaxEnabled)
        {
            _data?.calcMinMax(start: lowestVisibleXIndex, end: highestVisibleXIndex)
        }
        
        // calculate / set x-axis range
        _xAxis._axisMaximum = Double((_data?.xVals.count ?? 0) - 1)
        _xAxis.axisRange = .abs(_xAxis._axisMaximum - _xAxis._axisMinimum);
        
        // calculate axis range (min / max) according to provided data
        _leftAxis.calcMinMax(min: _data?.getYMin(.Left) ?? 0.0, max: _data?.getYMax(.Left) ?? 0.0)
        _rightAxis.calcMinMax(min: _data?.getYMin(.Right) ?? 0.0, max: _data?.getYMax(.Right) ?? 0.0)
    }
    
    internal override func calculateOffsets()
    {
        if (!_customViewPortEnabled)
        {
            var offsetLeft = CGFloat(0.0)
            var offsetRight = CGFloat(0.0)
            var offsetTop = CGFloat(0.0)
            var offsetBottom = CGFloat(0.0)
            
            // setup offsets for legend
            if (_legend !== nil && _legend.isEnabled)
            {
                if (_legend.position == .RightOfChart
                    || _legend.position == .RightOfChartCenter)
                {
                    offsetRight += min(_legend.neededWidth, _viewPortHandler.chartWidth * _legend.maxSizePercent) + _legend.xOffset * 2.0
                }
                if (_legend.position == .LeftOfChart
                    || _legend.position == .LeftOfChartCenter)
                {
                    offsetLeft += min(_legend.neededWidth, _viewPortHandler.chartWidth * _legend.maxSizePercent) + _legend.xOffset * 2.0
                }
                else if (_legend.position == .BelowChartLeft
                    || _legend.position == .BelowChartRight
                    || _legend.position == .BelowChartCenter)
                {
                    // It's possible that we do not need this offset anymore as it
                    //   is available through the extraOffsets, but changing it can mean
                    //   changing default visibility for existing apps.
                    let yOffset = _legend.textHeightMax
                    
                    offsetBottom += min(_legend.neededHeight + yOffset, _viewPortHandler.chartHeight * _legend.maxSizePercent)
                }
                else if (_legend.position == .AboveChartLeft
                    || _legend.position == .AboveChartRight
                    || _legend.position == .AboveChartCenter)
                {
                    // It's possible that we do not need this offset anymore as it
                    //   is available through the extraOffsets, but changing it can mean
                    //   changing default visibility for existing apps.
                    let yOffset = _legend.textHeightMax
                    
                    offsetTop += min(_legend.neededHeight + yOffset, _viewPortHandler.chartHeight * _legend.maxSizePercent)
                }
            }
            
            // offsets for y-labels
            if (leftAxis.needsOffset)
            {
                offsetLeft += leftAxis.requiredSize().width
            }
            
            if (rightAxis.needsOffset)
            {
                offsetRight += rightAxis.requiredSize().width
            }

            if (xAxis.isEnabled && xAxis.isDrawLabelsEnabled)
            {
                let xlabelheight = xAxis.labelRotatedHeight + xAxis.yOffset
                
                // offsets for x-labels
                if (xAxis.labelPosition == .Bottom)
                {
                    offsetBottom += xlabelheight
                }
                else if (xAxis.labelPosition == .Top)
                {
                    offsetTop += xlabelheight
                }
                else if (xAxis.labelPosition == .BothSided)
                {
                    offsetBottom += xlabelheight
                    offsetTop += xlabelheight
                }
            }
            
            offsetTop += self.extraTopOffset
            offsetRight += self.extraRightOffset
            offsetBottom += self.extraBottomOffset
            offsetLeft += self.extraLeftOffset

            _viewPortHandler.restrainViewPort(
                offsetLeft: max(self.minOffset, offsetLeft),
                offsetTop: max(self.minOffset, offsetTop),
                offsetRight: max(self.minOffset, offsetRight),
                offsetBottom: max(self.minOffset, offsetBottom))
        }
        
        prepareOffsetMatrix()
        prepareValuePxMatrix()
    }
   

    /// calculates the modulus for x-labels and grid
    internal func calcModulus()
    {
        if (_xAxis === nil || !_xAxis.isEnabled)
        {
            return
        }
        
        if (!_xAxis.isAxisModulusCustom)
        {
            _xAxis.axisLabelModulus = Int(ceil((CGFloat(_data?.xValCount ?? 0) * _xAxis.labelRotatedWidth) / (_viewPortHandler.contentWidth * _viewPortHandler.touchMatrix.a)))
        }
        
        if (_xAxis.axisLabelModulus < 1)
        {
            _xAxis.axisLabelModulus = 1
        }
    }
    
    public override func getMarkerPosition(entry e: ChartDataEntry, highlight: ChartHighlight) -> CGPoint
    {
        guard let data = _data else { return CGPointZero }

        let dataSetIndex = highlight.dataSetIndex
        var xPos = CGFloat(e.xIndex)
        var yPos = CGFloat(e.value)
        
        if (self.isKindOfClass(BarChartView))
        {
            let bd = _data as! BarChartData
            let space = bd.groupSpace
            let setCount = data.dataSetCount
            let i = e.xIndex
            
            if self is HorizontalBarChartView
            {
                // calculate the x-position, depending on datasetcount
                let y = CGFloat(i + i * (setCount - 1) + dataSetIndex) + space * CGFloat(i) + space / 2.0
                
                yPos = y
                
                if let entry = e as? BarChartDataEntry
                {
                    if entry.values != nil && highlight.range !== nil
                    {
                        xPos = CGFloat(highlight.range!.to)
                    }
                    else
                    {
                        xPos = CGFloat(e.value)
                    }
                }
            }
            else
            {
                let x = CGFloat(i + i * (setCount - 1) + dataSetIndex) + space * CGFloat(i) + space / 2.0
                
                xPos = x
                
                if let entry = e as? BarChartDataEntry
                {
                    if entry.values != nil && highlight.range !== nil
                    {
                        yPos = CGFloat(highlight.range!.to)
                    }
                    else
                    {
                        yPos = CGFloat(e.value)
                    }
                }
            }
        }
        
        // position of the marker depends on selected value index and value
        var pt = CGPoint(x: xPos, y: yPos * _animator.phaseY)
        
        getTransformer(data.getDataSetByIndex(dataSetIndex)!.axisDependency).pointValueToPixel(&pt)
        
        return pt
    }
    
    /// draws the grid background
    internal func drawGridBackground(context context: CGContext)
    {
        if (drawGridBackgroundEnabled || drawBordersEnabled)
        {
            CGContextSaveGState(context)
        }
        
        if (drawGridBackgroundEnabled)
        {
            // draw the grid background
            CGContextSetFillColorWithColor(context, gridBackgroundColor.CGColor)
            CGContextFillRect(context, _viewPortHandler.contentRect)
        }
        
        if (drawBordersEnabled)
        {
            CGContextSetLineWidth(context, borderLineWidth)
            CGContextSetStrokeColorWithColor(context, borderColor.CGColor)
            CGContextStrokeRect(context, _viewPortHandler.contentRect)
        }
        
        if (drawGridBackgroundEnabled || drawBordersEnabled)
        {
            CGContextRestoreGState(context)
        }
    }
    
    // MARK: - Gestures
    
    private enum GestureScaleAxis
    {
        case Both
        case X
        case Y
    }
    
    private var _isDragging = false
    private var _isScaling = false
    private var _gestureScaleAxis = GestureScaleAxis.Both
    private var _closestDataSetToTouch: IChartDataSet!
    private var _panGestureReachedEdge: Bool = false
    private weak var _outerScrollView: NSUIScrollView?
    
    private var _lastPanPoint = CGPoint() /// This is to prevent using setTranslation which resets velocity
    
    private var _decelerationLastTime: NSTimeInterval = 0.0
    private var _decelerationDisplayLink: NSUIDisplayLink!
    private var _decelerationVelocity = CGPoint()
    
    @objc private func tapGestureRecognized(recognizer: NSUITapGestureRecognizer)
    {
        if _data === nil
        {
            return
        }
        
        if (recognizer.state == NSUIGestureRecognizerState.Ended)
        {
            if !self.isHighLightPerTapEnabled { return }
            
            let h = getHighlightByTouchPoint(recognizer.locationInView(self))
            
            if (h === nil || h!.isEqual(self.lastHighlighted))
            {
                self.highlightValue(highlight: nil, callDelegate: true)
                self.lastHighlighted = nil
            }
            else
            {
                self.lastHighlighted = h
                self.highlightValue(highlight: h, callDelegate: true)
            }
        }
    }
    
    @objc private func doubleTapGestureRecognized(recognizer: NSUITapGestureRecognizer)
    {
        if _data === nil
        {
            return
        }
        
        if (recognizer.state == NSUIGestureRecognizerState.Ended)
        {
            if _data !== nil && _doubleTapToZoomEnabled
            {
                var location = recognizer.locationInView(self)
                location.x = location.x - _viewPortHandler.offsetLeft
                
                if (isAnyAxisInverted && _closestDataSetToTouch !== nil && getAxis(_closestDataSetToTouch.axisDependency).isInverted)
                {
                    location.y = -(location.y - _viewPortHandler.offsetTop)
                }
                else
                {
                    location.y = -(self.bounds.size.height - location.y - _viewPortHandler.offsetBottom)
                }
                
                self.zoom(isScaleXEnabled ? 1.4 : 1.0, scaleY: isScaleYEnabled ? 1.4 : 1.0, x: location.x, y: location.y)
            }
        }
    }
    
    #if !os(tvOS)
    @objc private func pinchGestureRecognized(recognizer: NSUIPinchGestureRecognizer)
    {
        if (recognizer.state == NSUIGestureRecognizerState.Began)
        {
            stopDeceleration()
            
            if _data !== nil && (_pinchZoomEnabled || _scaleXEnabled || _scaleYEnabled)
            {
                _isScaling = true
                
                if (_pinchZoomEnabled)
                {
                    _gestureScaleAxis = .Both
                }
                else
                {
                    let x = abs(recognizer.locationInView(self).x - recognizer.nsuiLocationOfTouch(1, inView: self).x)
                    let y = abs(recognizer.locationInView(self).y - recognizer.nsuiLocationOfTouch(1, inView: self).y)
                    
                    if (x > y)
                    {
                        _gestureScaleAxis = .X
                    }
                    else
                    {
                        _gestureScaleAxis = .Y
                    }
                }
            }
        }
        else if (recognizer.state == NSUIGestureRecognizerState.Ended ||
            recognizer.state == NSUIGestureRecognizerState.Cancelled)
        {
            if (_isScaling)
            {
                _isScaling = false
                
                // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
                calculateOffsets()
                setNeedsDisplay()
            }
        }
        else if (recognizer.state == NSUIGestureRecognizerState.Changed)
        {
            let isZoomingOut = (recognizer.nsuiScale < 1)
            var canZoomMoreX = isZoomingOut ? _viewPortHandler.canZoomOutMoreX : _viewPortHandler.canZoomInMoreX
            var canZoomMoreY = isZoomingOut ? _viewPortHandler.canZoomOutMoreY : _viewPortHandler.canZoomInMoreY
            
            if (_isScaling)
            {
                canZoomMoreX = canZoomMoreX && _scaleXEnabled && (_gestureScaleAxis == .Both || _gestureScaleAxis == .X);
                canZoomMoreY = canZoomMoreY && _scaleYEnabled && (_gestureScaleAxis == .Both || _gestureScaleAxis == .Y);
                if canZoomMoreX || canZoomMoreY
                {
                    var location = recognizer.locationInView(self)
                    location.x = location.x - _viewPortHandler.offsetLeft

                    if (isAnyAxisInverted && _closestDataSetToTouch !== nil && getAxis(_closestDataSetToTouch.axisDependency).isInverted)
                    {
                        location.y = -(location.y - _viewPortHandler.offsetTop)
                    }
                    else
                    {
                        location.y = -(_viewPortHandler.chartHeight - location.y - _viewPortHandler.offsetBottom)
                    }
                    
                    let scaleX = canZoomMoreX ? recognizer.nsuiScale : 1.0
                    let scaleY = canZoomMoreY ? recognizer.nsuiScale : 1.0
                    
                    var matrix = CGAffineTransformMakeTranslation(location.x, location.y)
                    matrix = CGAffineTransformScale(matrix, scaleX, scaleY)
                    matrix = CGAffineTransformTranslate(matrix,
                        -location.x, -location.y)
                    
                    matrix = CGAffineTransformConcat(_viewPortHandler.touchMatrix, matrix)
                    
                    _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: true)
                    
                    if (delegate !== nil)
                    {
                        delegate?.chartScaled?(self, scaleX: scaleX, scaleY: scaleY)
                    }
                }
                
                recognizer.nsuiScale = 1.0
            }
        }
    }
    #endif
    
    @objc private func panGestureRecognized(recognizer: NSUIPanGestureRecognizer)
    {
        if (recognizer.state == NSUIGestureRecognizerState.Began && recognizer.nsuiNumberOfTouches() > 0)
        {
            stopDeceleration()
            
            if _data === nil
            { // If we have no data, we have nothing to pan and no data to highlight
                return;
            }
            
            // If drag is enabled and we are in a position where there's something to drag:
            //  * If we're zoomed in, then obviously we have something to drag.
            //  * If we have a drag offset - we always have something to drag
            if self.isDragEnabled &&
                (!self.hasNoDragOffset || !self.isFullyZoomedOut)
            {
                _isDragging = true
                
                _closestDataSetToTouch = getDataSetByTouchPoint(recognizer.nsuiLocationOfTouch(0, inView: self))
                
                let translation = recognizer.translationInView(self)
                let didUserDrag = (self is HorizontalBarChartView) ? translation.y != 0.0 : translation.x != 0.0
                
                // Check to see if user dragged at all and if so, can the chart be dragged by the given amount
                if (didUserDrag && !performPanChange(translation: translation))
                {
                    if (_outerScrollView !== nil)
                    {
                        // We can stop dragging right now, and let the scroll view take control
                        _outerScrollView = nil
                        _isDragging = false
                    }
                }
                else
                {
                    if (_outerScrollView !== nil)
                    {
                        // Prevent the parent scroll view from scrolling
                        _outerScrollView?.scrollEnabled = false
                    }
                }
                
                _lastPanPoint = recognizer.translationInView(self)
            }
            else if self.isHighlightPerDragEnabled
            {
                // We will only handle highlights on NSUIGestureRecognizerState.Changed
                
                _isDragging = false
            }
        }
        else if (recognizer.state == NSUIGestureRecognizerState.Changed)
        {
            if (_isDragging)
            {
                let originalTranslation = recognizer.translationInView(self)
                let translation = CGPoint(x: originalTranslation.x - _lastPanPoint.x, y: originalTranslation.y - _lastPanPoint.y)
                
                performPanChange(translation: translation)
                
                _lastPanPoint = originalTranslation
            }
            else if (isHighlightPerDragEnabled)
            {
                let h = getHighlightByTouchPoint(recognizer.locationInView(self))
                
                let lastHighlighted = self.lastHighlighted
                
                if ((h === nil && lastHighlighted !== nil) ||
                    (h !== nil && lastHighlighted === nil) ||
                    (h !== nil && lastHighlighted !== nil && !h!.isEqual(lastHighlighted)))
                {
                    self.lastHighlighted = h
                    self.highlightValue(highlight: h, callDelegate: true)
                }
            }
        }
        else if (recognizer.state == NSUIGestureRecognizerState.Ended || recognizer.state == NSUIGestureRecognizerState.Cancelled)
        {
            if (_isDragging)
            {
                if (recognizer.state == NSUIGestureRecognizerState.Ended && isDragDecelerationEnabled)
                {
                    stopDeceleration()
                    
                    _decelerationLastTime = CACurrentMediaTime()
                    _decelerationVelocity = recognizer.velocityInView(self)
                    
                    _decelerationDisplayLink = NSUIDisplayLink(target: self, selector: #selector(BarLineChartViewBase.decelerationLoop))
                    _decelerationDisplayLink.addToRunLoop(NSRunLoop.mainRunLoop(), forMode: NSRunLoopCommonModes)
                }
                
                _isDragging = false
            }
            
            if (_outerScrollView !== nil)
            {
                _outerScrollView?.scrollEnabled = true
                _outerScrollView = nil
            }
        }
    }
    
    private func performPanChange(translation translation: CGPoint) -> Bool
    {
        var translation = translation
        
        if (isAnyAxisInverted && _closestDataSetToTouch !== nil
            && getAxis(_closestDataSetToTouch.axisDependency).isInverted)
        {
            if (self is HorizontalBarChartView)
            {
                translation.x = -translation.x
            }
            else
            {
                translation.y = -translation.y
            }
        }
        
        let originalMatrix = _viewPortHandler.touchMatrix
        
        var matrix = CGAffineTransformMakeTranslation(translation.x, translation.y)
        matrix = CGAffineTransformConcat(originalMatrix, matrix)
        
        matrix = _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: true)
        
        if (delegate !== nil)
        {
            delegate?.chartTranslated?(self, dX: translation.x, dY: translation.y)
        }
        
        // Did we managed to actually drag or did we reach the edge?
        return matrix.tx != originalMatrix.tx || matrix.ty != originalMatrix.ty
    }
    
    public func stopDeceleration()
    {
        if (_decelerationDisplayLink !== nil)
        {
            _decelerationDisplayLink.removeFromRunLoop(NSRunLoop.mainRunLoop(), forMode: NSRunLoopCommonModes)
            _decelerationDisplayLink = nil
        }
    }
    
    @objc private func decelerationLoop()
    {
        let currentTime = CACurrentMediaTime()
        
        _decelerationVelocity.x *= self.dragDecelerationFrictionCoef
        _decelerationVelocity.y *= self.dragDecelerationFrictionCoef
        
        let timeInterval = CGFloat(currentTime - _decelerationLastTime)
        
        let distance = CGPoint(
            x: _decelerationVelocity.x * timeInterval,
            y: _decelerationVelocity.y * timeInterval
        )
        
        if (!performPanChange(translation: distance))
        {
            // We reached the edge, stop
            _decelerationVelocity.x = 0.0
            _decelerationVelocity.y = 0.0
        }
        
        _decelerationLastTime = currentTime
        
        if (abs(_decelerationVelocity.x) < 0.001 && abs(_decelerationVelocity.y) < 0.001)
        {
            stopDeceleration()
            
            // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
            calculateOffsets()
            setNeedsDisplay()
        }
    }
    
    private func nsuiGestureRecognizerShouldBegin(gestureRecognizer: NSUIGestureRecognizer) -> Bool
    {
        if (gestureRecognizer == _panGestureRecognizer)
        {
            if _data === nil || !_dragEnabled ||
                (self.hasNoDragOffset && self.isFullyZoomedOut && !self.isHighlightPerDragEnabled)
            {
                return false
            }
        }
        else
        {
            #if !os(tvOS)
                if (gestureRecognizer == _pinchGestureRecognizer)
                {
                    if _data === nil || (!_pinchZoomEnabled && !_scaleXEnabled && !_scaleYEnabled)
                    {
                        return false
                    }
                }
            #endif
        }
        
        return true
    }
    
    #if !os(OSX)
    public override func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool
    {
        if (!super.gestureRecognizerShouldBegin(gestureRecognizer))
        {
            return false
        }
        
        return nsuiGestureRecognizerShouldBegin(gestureRecognizer)
    }
    #endif
    
    #if os(OSX)
    public func gestureRecognizerShouldBegin(gestureRecognizer: NSGestureRecognizer) -> Bool
    {
        return nsuiGestureRecognizerShouldBegin(gestureRecognizer)
    }
    #endif
    
    public func gestureRecognizer(gestureRecognizer: NSUIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: NSUIGestureRecognizer) -> Bool
    {
        #if !os(tvOS)
        if ((gestureRecognizer.isKindOfClass(NSUIPinchGestureRecognizer) &&
            otherGestureRecognizer.isKindOfClass(NSUIPanGestureRecognizer)) ||
            (gestureRecognizer.isKindOfClass(NSUIPanGestureRecognizer) &&
                otherGestureRecognizer.isKindOfClass(NSUIPinchGestureRecognizer)))
        {
            return true
        }
        #endif
        
        if (gestureRecognizer.isKindOfClass(NSUIPanGestureRecognizer) &&
            otherGestureRecognizer.isKindOfClass(NSUIPanGestureRecognizer) && (
                gestureRecognizer == _panGestureRecognizer
            ))
        {
            var scrollView = self.superview
            while (scrollView !== nil && !scrollView!.isKindOfClass(NSUIScrollView))
            {
                scrollView = scrollView?.superview
            }
            
            // If there is two scrollview together, we pick the superview of the inner scrollview.
            // In the case of UITableViewWrepperView, the superview will be UITableView
            if let superViewOfScrollView = scrollView?.superview where superViewOfScrollView.isKindOfClass(NSUIScrollView)
            {
                scrollView = superViewOfScrollView
            }

            var foundScrollView = scrollView as? NSUIScrollView
            
            if (foundScrollView !== nil && !foundScrollView!.scrollEnabled)
            {
                foundScrollView = nil
            }
            
            var scrollViewPanGestureRecognizer: NSUIGestureRecognizer!
            
            if (foundScrollView !== nil)
            {
                for scrollRecognizer in foundScrollView!.nsuiGestureRecognizers!
                {
                    if (scrollRecognizer.isKindOfClass(NSUIPanGestureRecognizer))
                    {
                        scrollViewPanGestureRecognizer = scrollRecognizer as! NSUIPanGestureRecognizer
                        break
                    }
                }
            }
            
            if (otherGestureRecognizer === scrollViewPanGestureRecognizer)
            {
                _outerScrollView = foundScrollView
                
                return true
            }
        }
        
        return false
    }
    
    /// MARK: Viewport modifiers
    
    /// Zooms in by 1.4, into the charts center. center.
    public func zoomIn()
    {
        let center = _viewPortHandler.contentCenter
        
        let matrix = _viewPortHandler.zoomIn(x: center.x, y: -center.y)
        _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: false)
        
        // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
        calculateOffsets()
        setNeedsDisplay()
    }

    /// Zooms out by 0.7, from the charts center. center.
    public func zoomOut()
    {
        let center = _viewPortHandler.contentCenter
        
        let matrix = _viewPortHandler.zoomOut(x: center.x, y: -center.y)
        _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: false)

        // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
        calculateOffsets()
        setNeedsDisplay()
    }

    /// Zooms in or out by the given scale factor. x and y are the coordinates
    /// (in pixels) of the zoom center.
    ///
    /// - parameter scaleX: if < 1 --> zoom out, if > 1 --> zoom in
    /// - parameter scaleY: if < 1 --> zoom out, if > 1 --> zoom in
    /// - parameter x:
    /// - parameter y:
    public func zoom(scaleX: CGFloat, scaleY: CGFloat, x: CGFloat, y: CGFloat)
    {
        let matrix = _viewPortHandler.zoom(scaleX: scaleX, scaleY: scaleY, x: x, y: y)
        _viewPortHandler.refresh(newMatrix: matrix, chart: self, invalidate: false)
        
        // Range might have changed, which means that Y-axis labels could have changed in size, affecting Y-axis size. So we need to recalculate offsets.
        calculateOffsets()
        setNeedsDisplay()
    }

    /// Zooms in or out by the given scale factor.
    /// x and y are the values (**not pixels**) which to zoom to or from (the values of the zoom center).
    ///
    /// - parameter scaleX: if < 1 --> zoom out, if > 1 --> zoom in
    /// - parameter scaleY: if < 1 --> zoom out, if > 1 --> zoom in
    /// - parameter xIndex:
    /// - parameter yValue:
{'fraction_non_alphanumeric': 0.07358583748053034, 'fraction_numerical': 0.003140472843774139, 'mean_word_length': 1.726582191071367, 'pattern_counts': {'":': 0, '<': 27, '<?xml version=': 0, '>': 51, 'https://': 2, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '3513589', 'n_tokens_mistral': 21663, 'n_tokens_neox': 20212, 'n_words': 4482}