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/**
* jqPlot
* Pure JavaScript plotting plugin using jQuery
*
* Version: @VERSION
* Revision: @REVISION
*
* Copyright (c) 2009-2013 Chris Leonello
* jqPlot is currently available for use in all personal or commercial projects
* under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL
* version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can
* choose the license that best suits your project and use it accordingly.
*
* Although not required, the author would appreciate an email letting him
* know of any substantial use of jqPlot. You can reach the author at:
* chris at jqplot dot com or see http://www.jqplot.com/info.php .
*
* If you are feeling kind and generous, consider supporting the project by
* making a donation at: http://www.jqplot.com/donate.php .
*
* sprintf functions contained in jqplot.sprintf.js by Ash Searle:
*
* version 2007.04.27
* author Ash Searle
* http://hexmen.com/blog/2007/03/printf-sprintf/
* http://hexmen.com/js/sprintf.js
* The author (Ash Searle) has placed this code in the public domain:
* "This code is unrestricted: you are free to use it however you like."
*
*/
(function($) {
// class: $.jqplot.shadowRenderer
// The default jqPlot shadow renderer, rendering shadows behind shapes.
$.jqplot.ShadowRenderer = function(options){
// Group: Properties
// prop: angle
// Angle of the shadow in degrees. Measured counter-clockwise from the x axis.
this.angle = 45;
// prop: offset
// Pixel offset at the given shadow angle of each shadow stroke from the last stroke.
this.offset = 1;
// prop: alpha
// alpha transparency of shadow stroke.
this.alpha = 0.07;
// prop: lineWidth
// width of the shadow line stroke.
this.lineWidth = 1.5;
// prop: lineJoin
// How line segments of the shadow are joined.
this.lineJoin = 'miter';
// prop: lineCap
// how ends of the shadow line are rendered.
this.lineCap = 'round';
// prop; closePath
// whether line path segment is closed upon itself.
this.closePath = false;
// prop: fill
// whether to fill the shape.
this.fill = false;
// prop: depth
// how many times the shadow is stroked. Each stroke will be offset by offset at angle degrees.
this.depth = 3;
this.strokeStyle = 'rgba(0,0,0,0.1)';
// prop: isarc
// whether the shadow is an arc or not.
this.isarc = false;
$.extend(true, this, options);
};
$.jqplot.ShadowRenderer.prototype.init = function(options) {
$.extend(true, this, options);
};
// function: draw
// draws an transparent black (i.e. gray) shadow.
//
// ctx - canvas drawing context
// points - array of points or [x, y, radius, start angle (rad), end angle (rad)]
$.jqplot.ShadowRenderer.prototype.draw = function(ctx, points, options) {
ctx.save();
var opts = (options != null) ? options : {};
var fill = (opts.fill != null) ? opts.fill : this.fill;
var fillRect = (opts.fillRect != null) ? opts.fillRect : this.fillRect;
var closePath = (opts.closePath != null) ? opts.closePath : this.closePath;
var offset = (opts.offset != null) ? opts.offset : this.offset;
var alpha = (opts.alpha != null) ? opts.alpha : this.alpha;
var depth = (opts.depth != null) ? opts.depth : this.depth;
var isarc = (opts.isarc != null) ? opts.isarc : this.isarc;
var linePattern = (opts.linePattern != null) ? opts.linePattern : this.linePattern;
ctx.lineWidth = (opts.lineWidth != null) ? opts.lineWidth : this.lineWidth;
ctx.lineJoin = (opts.lineJoin != null) ? opts.lineJoin : this.lineJoin;
ctx.lineCap = (opts.lineCap != null) ? opts.lineCap : this.lineCap;
ctx.strokeStyle = opts.strokeStyle || this.strokeStyle || 'rgba(0,0,0,'+alpha+')';
ctx.fillStyle = opts.fillStyle || this.fillStyle || 'rgba(0,0,0,'+alpha+')';
for (var j=0; j<depth; j++) {
var ctxPattern = $.jqplot.LinePattern(ctx, linePattern);
ctx.translate(Math.cos(this.angle*Math.PI/180)*offset, Math.sin(this.angle*Math.PI/180)*offset);
ctxPattern.beginPath();
if (isarc) {
ctx.arc(points[0], points[1], points[2], points[3], points[4], true);
}
else if (fillRect) {
if (fillRect) {
ctx.fillRect(points[0], points[1], points[2], points[3]);
}
}
else if (points && points.length){
var move = true;
for (var i=0; i<points.length; i++) {
// skip to the first non-null point and move to it.
if (points[i][0] != null && points[i][1] != null) {
if (move) {
ctxPattern.moveTo(points[i][0], points[i][1]);
move = false;
}
else {
ctxPattern.lineTo(points[i][0], points[i][1]);
}
}
else {
move = true;
}
}
}
if (closePath) {
ctxPattern.closePath();
}
if (fill) {
ctx.fill();
}
else {
ctx.stroke();
}
}
ctx.restore();
};
})(jQuery);
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