Subversion-Projekte lars-tiefland.cienc

/**

 * jqPlot

 * Pure JavaScript plotting plugin using jQuery

 *

 * Version: 1.0.8

 * Revision: 1250

 *

 * 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.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);