/** * jqPlot * Pure JavaScript plotting plugin using jQuery * * Version: 1.0.1 * Revision: 1096 * * Copyright (c) 2009-2011 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.CanvasAxisTickRenderer * Renderer to draw axis ticks 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.CanvasAxisTickRenderer = function(options) { // Group: Properties // prop: mark // tick mark on the axis. One of 'inside', 'outside', 'cross', '' or null. this.mark = 'outside'; // prop: showMark // wether or not to show the mark on the axis. this.showMark = true; // prop: showGridline // wether or not to draw the gridline on the grid at this tick. this.showGridline = true; // prop: isMinorTick // if this is a minor tick. this.isMinorTick = false; // prop: angle // angle of text, measured clockwise from x axis. this.angle = 0; // prop: markSize // Length of the tick marks in pixels. For 'cross' style, length // will be stoked above and below axis, so total length will be twice this. this.markSize = 4; // prop: show // wether or not to show the tick (mark and label). this.show = true; // prop: showLabel // wether or not to show the label. this.showLabel = true; // prop: labelPosition // 'auto', 'start', 'middle' or 'end'. // Whether tick label should be positioned so the start, middle, or end // of the tick mark. this.labelPosition = 'auto'; this.label = ''; this.value = null; this._styles = {}; // prop: formatter // A class of a formatter for the tick text. // The default $.jqplot.DefaultTickFormatter uses sprintf. this.formatter = $.jqplot.DefaultTickFormatter; // prop: formatString // string passed to the formatter. this.formatString = ''; // prop: prefix // String to prepend to the tick label. // Prefix is prepended to the formatted tick label. this.prefix = ''; // prop: fontFamily // css spec for the font-family css attribute. this.fontFamily = '"Trebuchet MS", Arial, Helvetica, sans-serif'; // prop: fontSize // CSS spec for font size. this.fontSize = '10pt'; // prop: fontWeight // CSS spec for fontWeight 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, tick label will be drawn with canvas tag native support for fonts. // If false, tick 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}; $.extend(true, this, options); var ropts = {fontSize:this.fontSize, fontWeight:this.fontWeight, fontStretch:this.fontStretch, fillStyle:this.textColor, angle:this.getAngleRad(), fontFamily:this.fontFamily}; if (this.pt2px) { ropts.pt2px = this.pt2px; } if (this.enableFontSupport) { if ($.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.CanvasAxisTickRenderer.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.CanvasAxisTickRenderer.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.CanvasAxisTickRenderer.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.CanvasAxisTickRenderer.prototype.getAngleRad = function() { var a = this.angle * Math.PI/180; return a; }; $.jqplot.CanvasAxisTickRenderer.prototype.setTick = function(value, axisName, isMinor) { this.value = value; if (isMinor) { this.isMinorTick = true; } return this; }; $.jqplot.CanvasAxisTickRenderer.prototype.draw = function(ctx, plot) { if (!this.label) { this.label = this.prefix + this.formatter(this.formatString, this.value); } // Memory Leaks patch if (this._elem) { if ($.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); // canvases seem to need to have width and heigh attributes directly set. elem.width = w; elem.height = h; elem.style.width = w; elem.style.height = h; elem.style.textAlign = 'left'; elem.style.position = 'absolute'; elem = plot.canvasManager.initCanvas(elem); this._elem = $(elem); this._elem.css(this._styles); this._elem.addClass('jqplot-'+this.axis+'-tick'); elem = null; return this._elem; }; $.jqplot.CanvasAxisTickRenderer.prototype.pack = function() { this._textRenderer.draw(this._elem.get(0).getContext("2d"), this.label); }; })(jQuery);