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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.CanvasAxisLabelRenderer * Renderer to draw axis labels with a canvas element to support advanced * featrues such as rotated text. This renderer uses a separate rendering engine * to draw the text on the canvas. Two modes of rendering the text are available. * If the browser has native font support for canvas fonts (currently Mozila 3.5 * and Safari 4), you can enable text rendering with the canvas fillText method. * You do so by setting the "enableFontSupport" option to true. * * Browsers lacking native font support will have the text drawn on the canvas * using the Hershey font metrics. Even if the "enableFontSupport" option is true * non-supporting browsers will still render with the Hershey font. * */ $.jqplot.CanvasAxisLabelRenderer = function(options) { // Group: Properties // prop: angle // angle of text, measured clockwise from x axis. this.angle = 0; // name of the axis associated with this tick this.axis; // prop: show // whether or not to show the tick (mark and label). this.show = true; // prop: showLabel // whether or not to show the label. this.showLabel = true; // prop: label // label for the axis. this.label = ''; // prop: fontFamily // CSS spec for the font-family css attribute. // Applies only to browsers supporting native font rendering in the // canvas tag. Currently Mozilla 3.5 and Safari 4. this.fontFamily = '"Trebuchet MS", Arial, Helvetica, sans-serif'; // prop: fontSize // CSS spec for font size. this.fontSize = '11pt'; // prop: fontWeight // CSS spec for fontWeight: normal, bold, bolder, lighter or a number 100 - 900 this.fontWeight = 'normal'; // prop: fontStretch // Multiplier to condense or expand font width. // Applies only to browsers which don't support canvas native font rendering. this.fontStretch = 1.0; // prop: textColor // css spec for the color attribute. this.textColor = '#666666'; // prop: enableFontSupport // true to turn on native canvas font support in Mozilla 3.5+ and Safari 4+. // If true, label will be drawn with canvas tag native support for fonts. // If false, label will be drawn with Hershey font metrics. this.enableFontSupport = true; // prop: pt2px // Point to pixel scaling factor, used for computing height of bounding box // around a label. The labels text renderer has a default setting of 1.4, which // should be suitable for most fonts. Leave as null to use default. If tops of // letters appear clipped, increase this. If bounding box seems too big, decrease. // This is an issue only with the native font renderering capabilities of Mozilla // 3.5 and Safari 4 since they do not provide a method to determine the font height. this.pt2px = null; this._elem; this._ctx; this._plotWidth; this._plotHeight; this._plotDimensions = {height:null, width:null}; $.extend(true, this, options); if (options.angle == null && this.axis != 'xaxis' && this.axis != 'x2axis') { this.angle = -90; } var ropts = {fontSize:this.fontSize, fontWeight:this.fontWeight, fontStretch:this.fontStretch, fillStyle:this.textColor, angle:this.getAngleRad(), fontFamily:this.fontFamily}; if (this.pt2px) { ropts.pt2px = this.pt2px; } if (this.enableFontSupport) { if ($.jqplot.support_canvas_text()) { this._textRenderer = new $.jqplot.CanvasFontRenderer(ropts); } else { this._textRenderer = new $.jqplot.CanvasTextRenderer(ropts); } } else { this._textRenderer = new $.jqplot.CanvasTextRenderer(ropts); } }; $.jqplot.CanvasAxisLabelRenderer.prototype.init = function(options) { $.extend(true, this, options); this._textRenderer.init({fontSize:this.fontSize, fontWeight:this.fontWeight, fontStretch:this.fontStretch, fillStyle:this.textColor, angle:this.getAngleRad(), fontFamily:this.fontFamily}); }; // return width along the x axis // will check first to see if an element exists. // if not, will return the computed text box width. $.jqplot.CanvasAxisLabelRenderer.prototype.getWidth = function(ctx) { if (this._elem) { return this._elem.outerWidth(true); } else { var tr = this._textRenderer; var l = tr.getWidth(ctx); var h = tr.getHeight(ctx); var w = Math.abs(Math.sin(tr.angle)*h) + Math.abs(Math.cos(tr.angle)*l); return w; } }; // return height along the y axis. $.jqplot.CanvasAxisLabelRenderer.prototype.getHeight = function(ctx) { if (this._elem) { return this._elem.outerHeight(true); } else { var tr = this._textRenderer; var l = tr.getWidth(ctx); var h = tr.getHeight(ctx); var w = Math.abs(Math.cos(tr.angle)*h) + Math.abs(Math.sin(tr.angle)*l); return w; } }; $.jqplot.CanvasAxisLabelRenderer.prototype.getAngleRad = function() { var a = this.angle * Math.PI/180; return a; }; $.jqplot.CanvasAxisLabelRenderer.prototype.draw = function(ctx, plot) { // Memory Leaks patch if (this._elem) { if ($.jqplot.use_excanvas && window.G_vmlCanvasManager.uninitElement !== undefined) { window.G_vmlCanvasManager.uninitElement(this._elem.get(0)); } this._elem.emptyForce(); this._elem = null; } // create a canvas here, but can't draw on it untill it is appended // to dom for IE compatability. var elem = plot.canvasManager.getCanvas(); this._textRenderer.setText(this.label, ctx); var w = this.getWidth(ctx); var h = this.getHeight(ctx); elem.width = w; elem.height = h; elem.style.width = w; elem.style.height = h; elem = plot.canvasManager.initCanvas(elem); this._elem = $(elem); this._elem.css({ position: 'absolute'}); this._elem.addClass('jqplot-'+this.axis+'-label'); elem = null; return this._elem; }; $.jqplot.CanvasAxisLabelRenderer.prototype.pack = function() { this._textRenderer.draw(this._elem.get(0).getContext("2d"), this.label); }; })(jQuery);