js/jquery.flot.cursors.js
function computeRowPosition(plot, cursor, index, count) {
        var width = plot.width();
        var height = plot.height();
        var textAlign = 'left';
        var fontSizeInPx = Number(cursor.fontSize.substring(0, cursor.fontSize.length - 2));

        var y = cursor.y;
        var x = cursor.x;

        if (x > (width / 2)) {
            x -= constants.labelPadding;
            textAlign = 'right';
        } else {
            x += constants.labelPadding;
        }

        if (y > (height / 2)) {
            y -= constants.labelPadding * (count - index) + fontSizeInPx * (count - 1 - index);
        } else {
            y += constants.labelPadding * (index + 1) + fontSizeInPx * (index + 1);
        }

        return {
            x: x,
            y: y,
            textAlign: textAlign
        };
    }
function computeRowPosition(plot, cursor, index, count) {
        var width = plot.width();
        var height = plot.height();
        var textAlign = 'left';
        var fontSizeInPx = Number(cursor.fontSize.substring(0, cursor.fontSize.length - 2));

        var y = cursor.y;
        var x = cursor.x;

        if (x > (width / 2)) {
            x -= constants.labelPadding;
            textAlign = 'right';
        } else {
            x += constants.labelPadding;
        }

        if (y > (height / 2)) {
            y -= constants.labelPadding * (count - index) + fontSizeInPx * (count - 1 - index);
        } else {
            y += constants.labelPadding * (index + 1) + fontSizeInPx * (index + 1);
        }

        return {
            x: x,
            y: y,
            textAlign: textAlign
        };
    }
The text displayed next to the cursor can be stacked as rows and their positions can be calculated with this function.
The bottom one has the index = 0, and the top one has the index = count -1. Depending on the current cursor's possition
relative to the center of the plot, index and count, the positions will be computed like this:

|
two | two
one | one
zero | zero
--------+--------
two | two
one | one
zero | zero
|