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msd2/tracking/piwik/libs/jqplot/jqplot.shadowRenderer.js

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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);