<commit_before>/*
 * Copyright 2016 <NAME>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.matthewtamlin.android_utilities.library.helpers;

import android.content.Context;
import android.util.DisplayMetrics;
import android.util.TypedValue;

import static com.matthewtamlin.java_utilities.checkers.IntChecker.checkGreaterThanOrEqualTo;
import static com.matthewtamlin.java_utilities.checkers.NullChecker.checkNotNull;

/**
 * Converts complex units such as DP and SP to pixels.
 */
public class DimensionHelper {
	/**
	 * Converts a dimension from display-independent pixels (dp) to pixels (px).
	 *
	 * @param context
	 * 		a Context object containing the display metrics to base the conversion on, not null
	 * @param dpValue
	 * 		the dimension to convert, measured in display-independent pixels, not less than zero
	 *
	 * @return the supplied dimension converted to pixels
	 *
	 * @throws IllegalArgumentException
	 * 		if {@code context} is null
	 * @throws IllegalArgumentException
	 * 		if {@code dpValue} is less than zero
	 */
	public static int dpToPx(final Context context, final int dpValue) {
		checkNotNull(context, "context cannot be null.");
		checkGreaterThanOrEqualTo(dpValue, 0, "dpValue must be at least 0.");

		final DisplayMetrics metrics = context.getResources().getDisplayMetrics();
		return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpValue, metrics);
	}

	/**
	 * Converts a dimension from scaled pixels (sp) to pixels (px).
	 *
	 * @param context
	 * 		a Context object containing the display metrics to base the conversion on, not null
	 * @param spValue
	 * 		the dimension to convert, measured in scaled pixels, not less than zero
	 *
	 * @return the supplied dimension converted to pixels
	 *
	 * @throws IllegalArgumentException
	 * 		if {@code context} is null<commit_msg>Changed dpToPx return type to float<commit_after>/*
 * Copyright 2016 <NAME>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.matthewtamlin.android_utilities.library.helpers;

import android.content.Context;
import android.util.DisplayMetrics;
import android.util.TypedValue;

import static com.matthewtamlin.java_utilities.checkers.IntChecker.checkGreaterThanOrEqualTo;
import static com.matthewtamlin.java_utilities.checkers.NullChecker.checkNotNull;

/**
 * Converts complex units such as DP and SP to pixels.
 */
public class DimensionHelper {
	/**
	 * Converts a dimension from display-independent pixels (dp) to pixels (px).
	 *
	 * @param context
	 * 		a Context object containing the display metrics to base the conversion on, not null
	 * @param dpValue
	 * 		the dimension to convert, measured in display-independent pixels, not less than zero
	 *
	 * @return the supplied dimension converted to pixels
	 *
	 * @throws IllegalArgumentException
	 * 		if {@code context} is null
	 * @throws IllegalArgumentException
	 * 		if {@code dpValue} is less than zero
	 */
	public static float dpToPx(final Context context, final int dpValue) {
		checkNotNull(context, "context cannot be null.");
		checkGreaterThanOrEqualTo(dpValue, 0, "dpValue must be at least 0.");

		final DisplayMetrics metrics = context.getResources().getDisplayMetrics();
		return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpValue, metrics);
	}

	/**
	 * Converts a dimension from scaled pixels (sp) to pixels (px).
	 *
	 * @param context
	 * 		a Context object containing the display metrics to base the conversion on, not null
	 * @param spValue
	 * 		the dimension to convert, measured in scaled pixels, not less than zero
	 *
	 * @return the supplied dimension converted to pixels
	 *
	 * @throws IllegalArgumentException
	 * 		if {@code context} is null
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