target/classes/static/js/plugins/flot/jquery.flot.spline.js

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/**
 * Flot plugin that provides spline interpolation for line graphs
 * author: Alex Bardas < alex.bardas@gmail.com >
 * modified by: Avi Kohn https://github.com/AMKohn
 * based on the spline interpolation described at:
 *		 http://scaledinnovation.com/analytics/splines/aboutSplines.html
 *
 * Example usage: (add in plot options series object)
 *		for linespline:
 *			series: {
 *				...
 *				lines: {
 *					show: false
 *				},
 *				splines: {
 *					show: true,
 *					tension: x, (float between 0 and 1, defaults to 0.5),
 *					lineWidth: y (number, defaults to 2),
 *					fill: z (float between 0 .. 1 or false, as in flot documentation)
 *				},
 *				...
 *			}
 *		areaspline:
 *			series: {
 *				...
 *				lines: {
 *					show: true,
 *					lineWidth: 0, (line drawing will not execute)
 *					fill: x, (float between 0 .. 1, as in flot documentation)
 *					...
 *				},
 *				splines: {
 *					show: true,
 *					tension: 0.5 (float between 0 and 1)
 *				},
 *				...
 *			}
 *
 */

(function($) {
    'use strict'

    /**
     * @param {Number} x0, y0, x1, y1: coordinates of the end (knot) points of the segment
     * @param {Number} x2, y2: the next knot (not connected, but needed to calculate p2)
     * @param {Number} tension: control how far the control points spread
     * @return {Array}: p1 -> control point, from x1 back toward x0
     * 					p2 -> the next control point, returned to become the next segment's p1
     *
     * @api private
     */
    function getControlPoints(x0, y0, x1, y1, x2, y2, tension) {

        var pow = Math.pow,
            sqrt = Math.sqrt,
            d01, d12, fa, fb, p1x, p1y, p2x, p2y;

        //  Scaling factors: distances from this knot to the previous and following knots.
        d01 = sqrt(pow(x1 - x0, 2) + pow(y1 - y0, 2));