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   1  /**
   2   * jqPlot
   3   * Pure JavaScript plotting plugin using jQuery
   4   *
   5   * Version: 1.0.2
   6   * Revision: 1108
   7   *
   8   * Copyright (c) 2009-2011 Chris Leonello
   9   * jqPlot is currently available for use in all personal or commercial projects 
  10   * under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL 
  11   * version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can 
  12   * choose the license that best suits your project and use it accordingly. 
  13   *
  14   * Although not required, the author would appreciate an email letting him 
  15   * know of any substantial use of jqPlot.  You can reach the author at: 
  16   * chris at jqplot dot com or see http://www.jqplot.com/info.php .
  17   *
  18   * If you are feeling kind and generous, consider supporting the project by
  19   * making a donation at: http://www.jqplot.com/donate.php .
  20   *
  21   * sprintf functions contained in jqplot.sprintf.js by Ash Searle:
  22   *
  23   *     version 2007.04.27
  24   *     author Ash Searle
  25   *     http://hexmen.com/blog/2007/03/printf-sprintf/
  26   *     http://hexmen.com/js/sprintf.js
  27   *     The author (Ash Searle) has placed this code in the public domain:
  28   *     "This code is unrestricted: you are free to use it however you like."
  29   * 
  30   */
  31  (function($) {
  32      
  33      /**
  34       * Class: $.jqplot.Dragable
  35       * Plugin to make plotted points dragable by the user.
  36       */
  37      $.jqplot.Dragable = function(options) {
  38          // Group: Properties
  39          this.markerRenderer = new $.jqplot.MarkerRenderer({shadow:false});
  40          this.shapeRenderer = new $.jqplot.ShapeRenderer();
  41          this.isDragging = false;
  42          this.isOver = false;
  43          this._ctx;
  44          this._elem;
  45          this._point;
  46          this._gridData;
  47          // prop: color
  48          // CSS color spec for the dragged point (and adjacent line segment or bar).
  49          this.color;
  50          // prop: constrainTo
  51          // Constrain dragging motion to an axis or to none.
  52          // Allowable values are 'none', 'x', 'y'
  53          this.constrainTo = 'none';  // 'x', 'y', or 'none';
  54          $.extend(true, this, options);
  55      };
  56      
  57      function DragCanvas() {
  58          $.jqplot.GenericCanvas.call(this);
  59          this.isDragging = false;
  60          this.isOver = false;
  61          this._neighbor;
  62          this._cursors = [];
  63      }
  64      
  65      DragCanvas.prototype = new $.jqplot.GenericCanvas();
  66      DragCanvas.prototype.constructor = DragCanvas;
  67      
  68      
  69      // called within scope of series
  70      $.jqplot.Dragable.parseOptions = function (defaults, opts) {
  71          var options = opts || {};
  72          this.plugins.dragable = new $.jqplot.Dragable(options.dragable);
  73          // since this function is called before series options are parsed,
  74          // we can set this here and it will be overridden if needed.
  75          this.isDragable = $.jqplot.config.enablePlugins;
  76      };
  77      
  78      // called within context of plot
  79      // create a canvas which we can draw on.
  80      // insert it before the eventCanvas, so eventCanvas will still capture events.
  81      // add a new DragCanvas object to the plot plugins to handle drawing on this new canvas.
  82      $.jqplot.Dragable.postPlotDraw = function() {
  83          // Memory Leaks patch    
  84          if (this.plugins.dragable && this.plugins.dragable.highlightCanvas) {
  85              this.plugins.dragable.highlightCanvas.resetCanvas();
  86              this.plugins.dragable.highlightCanvas = null;
  87          }
  88  
  89          this.plugins.dragable = {previousCursor:'auto', isOver:false};
  90          this.plugins.dragable.dragCanvas = new DragCanvas();
  91          
  92          this.eventCanvas._elem.before(this.plugins.dragable.dragCanvas.createElement(this._gridPadding, 'jqplot-dragable-canvas', this._plotDimensions, this));
  93          var dctx = this.plugins.dragable.dragCanvas.setContext();
  94      };
  95      
  96      //$.jqplot.preInitHooks.push($.jqplot.Dragable.init);
  97      $.jqplot.preParseSeriesOptionsHooks.push($.jqplot.Dragable.parseOptions);
  98      $.jqplot.postDrawHooks.push($.jqplot.Dragable.postPlotDraw);
  99      $.jqplot.eventListenerHooks.push(['jqplotMouseMove', handleMove]);
 100      $.jqplot.eventListenerHooks.push(['jqplotMouseDown', handleDown]);
 101      $.jqplot.eventListenerHooks.push(['jqplotMouseUp', handleUp]);
 102  
 103      
 104      function initDragPoint(plot, neighbor) {
 105          var s = plot.series[neighbor.seriesIndex];
 106          var drag = s.plugins.dragable;
 107          
 108          // first, init the mark renderer for the dragged point
 109          var smr = s.markerRenderer;
 110          var mr = drag.markerRenderer;
 111          mr.style = smr.style;
 112          mr.lineWidth = smr.lineWidth + 2.5;
 113          mr.size = smr.size + 5;
 114          if (!drag.color) {
 115              var rgba = $.jqplot.getColorComponents(smr.color);
 116              var newrgb = [rgba[0], rgba[1], rgba[2]];
 117              var alpha = (rgba[3] >= 0.6) ? rgba[3]*0.6 : rgba[3]*(2-rgba[3]);
 118              drag.color = 'rgba('+newrgb[0]+','+newrgb[1]+','+newrgb[2]+','+alpha+')';
 119          }
 120          mr.color = drag.color;
 121          mr.init();
 122  
 123          var start = (neighbor.pointIndex > 0) ? neighbor.pointIndex - 1 : 0;
 124          var end = neighbor.pointIndex+2;
 125          drag._gridData = s.gridData.slice(start, end);
 126      }
 127      
 128      function handleMove(ev, gridpos, datapos, neighbor, plot) {
 129          if (plot.plugins.dragable.dragCanvas.isDragging) {
 130              var dc = plot.plugins.dragable.dragCanvas;
 131              var dp = dc._neighbor;
 132              var s = plot.series[dp.seriesIndex];
 133              var drag = s.plugins.dragable;
 134              var gd = s.gridData;
 135              
 136              // compute the new grid position with any constraints.
 137              var x = (drag.constrainTo == 'y') ? dp.gridData[0] : gridpos.x;
 138              var y = (drag.constrainTo == 'x') ? dp.gridData[1] : gridpos.y;
 139              
 140              // compute data values for any listeners.
 141              var xu = s._xaxis.series_p2u(x);
 142              var yu = s._yaxis.series_p2u(y);
 143              
 144              // clear the canvas then redraw effect at new position.
 145              var ctx = dc._ctx;
 146              ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
 147              
 148              // adjust our gridData for the new mouse position
 149              if (dp.pointIndex > 0) {
 150                  drag._gridData[1] = [x, y];
 151              }
 152              else {
 153                  drag._gridData[0] = [x, y];
 154              }
 155              plot.series[dp.seriesIndex].draw(dc._ctx, {gridData:drag._gridData, shadow:false, preventJqPlotSeriesDrawTrigger:true, color:drag.color, markerOptions:{color:drag.color, shadow:false}, trendline:{show:false}});
 156              plot.target.trigger('jqplotSeriesPointChange', [dp.seriesIndex, dp.pointIndex, [xu,yu], [x,y]]);
 157          }
 158          else if (neighbor != null) {
 159              var series = plot.series[neighbor.seriesIndex];
 160              if (series.isDragable) {
 161                  var dc = plot.plugins.dragable.dragCanvas;
 162                  if (!dc.isOver) {
 163                      dc._cursors.push(ev.target.style.cursor);
 164                      ev.target.style.cursor = "pointer";
 165                  }
 166                  dc.isOver = true;
 167              }
 168          }
 169          else if (neighbor == null) {
 170              var dc = plot.plugins.dragable.dragCanvas;
 171              if (dc.isOver) {
 172                  ev.target.style.cursor = dc._cursors.pop();
 173                  dc.isOver = false;
 174              }
 175          }
 176      }
 177      
 178      function handleDown(ev, gridpos, datapos, neighbor, plot) {
 179          var dc = plot.plugins.dragable.dragCanvas;
 180          dc._cursors.push(ev.target.style.cursor);
 181          if (neighbor != null) {
 182              var s = plot.series[neighbor.seriesIndex];
 183              var drag = s.plugins.dragable;
 184              if (s.isDragable && !dc.isDragging) {
 185                  dc._neighbor = neighbor;
 186                  dc.isDragging = true;
 187                  initDragPoint(plot, neighbor);
 188                  drag.markerRenderer.draw(s.gridData[neighbor.pointIndex][0], s.gridData[neighbor.pointIndex][1], dc._ctx);
 189                  ev.target.style.cursor = "move";
 190                  plot.target.trigger('jqplotDragStart', [neighbor.seriesIndex, neighbor.pointIndex, gridpos, datapos]);
 191              }
 192          }
 193          // Just in case of a hickup, we'll clear the drag canvas and reset.
 194          else {
 195             var ctx = dc._ctx;
 196             ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
 197             dc.isDragging = false;
 198          }
 199      }
 200      
 201      function handleUp(ev, gridpos, datapos, neighbor, plot) {
 202          if (plot.plugins.dragable.dragCanvas.isDragging) {
 203              var dc = plot.plugins.dragable.dragCanvas;
 204              // clear the canvas
 205              var ctx = dc._ctx;
 206              ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
 207              dc.isDragging = false;
 208              // redraw the series canvas at the new point.
 209              var dp = dc._neighbor;
 210              var s = plot.series[dp.seriesIndex];
 211              var drag = s.plugins.dragable;
 212              // compute the new grid position with any constraints.
 213              var x = (drag.constrainTo == 'y') ? dp.data[0] : datapos[s.xaxis];
 214              var y = (drag.constrainTo == 'x') ? dp.data[1] : datapos[s.yaxis];
 215              // var x = datapos[s.xaxis];
 216              // var y = datapos[s.yaxis];
 217              s.data[dp.pointIndex][0] = x;
 218              s.data[dp.pointIndex][1] = y;
 219              plot.drawSeries({preventJqPlotSeriesDrawTrigger:true}, dp.seriesIndex);
 220              dc._neighbor = null;
 221              ev.target.style.cursor = dc._cursors.pop();
 222              plot.target.trigger('jqplotDragStop', [gridpos, datapos]);
 223          }
 224      }
 225  })(jQuery);