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/**
* Licence: MIT and GPL version 2.0 licenses. This means that you can
* choose the license that best suits your project and use it accordingly.
*
* Based on other plugins for jqPlot by Chris Leonello (chris dot leonello at gmail)
* and Cubic Hermite spline - http://en.wikipedia.org/wiki/Cubic_Hermite_spline
* krypin at gmail dot com
*
* If you are feeling kind and generous, consider supporting the jqPlot project by
* making a donation at: http://www.jqplot.com/donate.php .
*
*/
(function ($)
{
// Class: $.jqplot.hermiteSplineRenderer
// A plugin renderer for jqPlot to draw a Hermite spline.
// Draws series as a cubic Hertmite spline.
$.jqplot.hermiteSplineRenderer = function ()
{
$.jqplot.LineRenderer.call(this);
};
$.jqplot.hermiteSplineRenderer.prototype = new $.jqplot.LineRenderer();
$.jqplot.hermiteSplineRenderer.prototype.constructor = $.jqplot.hermiteSplineRenderer;
// called with scope of series.
$.jqplot.hermiteSplineRenderer.prototype.init = function (options)
{
// Number of steps
this.steps = 50;
//Cardinal spline 'tension' constant which affects the tightness of the curve
//must be in the interval (0,1)
this.tension = 0.5;
$.extend(true, this, options);
// set the shape renderer options
var opts = {lineJoin: 'miter', lineCap: 'round', fill: false, isarc: false, strokeStyle: this.color, lineWidth: this.lineWidth};
this.renderer.shapeRenderer.init(opts);
};
$.jqplot.hermiteSplineRenderer.prototype.draw = function (ctx, gd, options)
{
var i;
var opts = (options != undefined) ? options : {};
var showLine = (opts.showLine != undefined) ? opts.showLine : this.showLine;
if (gd.length)
{
if (showLine)
{
if (gd.length > 1)
{
var newGD = [];
for (var i = 0; i < gd.length - 1; i++)
{
var steps = this.steps;
var a = this.tension;
for (var t = 0; t < steps; t++)
{
var s = t / steps;
var h1 = (1 + 2 * s) * Math.pow((1 - s), 2);
var h2 = s * Math.pow((1 - s), 2);
var h3 = Math.pow(s, 2) * (3 - 2 * s);
var h4 = Math.pow(s, 2) * (s - 1);
if (gd[i - 1])
{
var TiX = a * (gd[i + 1][0] - gd[i - 1][0]);
var TiY = a * (gd[i + 1][1] - gd[i - 1][1]);
}
else
{
var TiX = a * (gd[i + 1][0] - gd[i][0]);
var TiY = a * (gd[i + 1][1] - gd[i][1]);
}
if (gd[i + 2])
{
var Ti1X = a * (gd[i + 2][0] - gd[i][0]);
var Ti1Y = a * (gd[i + 2][1] - gd[i][1]);
}
else
{
var Ti1X = a * (gd[i + 1][0] - gd[i][0]);
var Ti1Y = a * (gd[i + 1][1] - gd[i][1]);
}
var pX = h1 * gd[i][0] + h3 * gd[i + 1][0] + h2 * TiX + h4 * Ti1X;
var pY = h1 * gd[i][1] + h3 * gd[i + 1][1] + h2 * TiY + h4 * Ti1Y;
if (pY < 1)
{
pY = 1;
} // Fix for overshoot > 100%
var p = [pX, pY];
newGD.push(p);
}
}
gd = newGD;
}
this.renderer.shapeRenderer.draw(ctx, gd, opts);
}
}
};
})(akeeba.jQuery);