jqplot.dragable.js
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/**
* jqPlot
* Pure JavaScript plotting plugin using jQuery
*
* Version: 1.0.4
* Revision: 1121
*
* Copyright (c) 2009-2012 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.Dragable
* Plugin to make plotted points dragable by the user.
*/
$.jqplot.Dragable = function(options) {
// Group: Properties
this.markerRenderer = new $.jqplot.MarkerRenderer({shadow:false});
this.shapeRenderer = new $.jqplot.ShapeRenderer();
this.isDragging = false;
this.isOver = false;
this._ctx;
this._elem;
this._point;
this._gridData;
// prop: color
// CSS color spec for the dragged point (and adjacent line segment or bar).
this.color;
// prop: constrainTo
// Constrain dragging motion to an axis or to none.
// Allowable values are 'none', 'x', 'y'
this.constrainTo = 'none'; // 'x', 'y', or 'none';
$.extend(true, this, options);
};
function DragCanvas() {
$.jqplot.GenericCanvas.call(this);
this.isDragging = false;
this.isOver = false;
this._neighbor;
this._cursors = [];
}
DragCanvas.prototype = new $.jqplot.GenericCanvas();
DragCanvas.prototype.constructor = DragCanvas;
// called within scope of series
$.jqplot.Dragable.parseOptions = function (defaults, opts) {
var options = opts || {};
this.plugins.dragable = new $.jqplot.Dragable(options.dragable);
// since this function is called before series options are parsed,
// we can set this here and it will be overridden if needed.
this.isDragable = $.jqplot.config.enablePlugins;
};
// called within context of plot
// create a canvas which we can draw on.
// insert it before the eventCanvas, so eventCanvas will still capture events.
// add a new DragCanvas object to the plot plugins to handle drawing on this new canvas.
$.jqplot.Dragable.postPlotDraw = function() {
// Memory Leaks patch
if (this.plugins.dragable && this.plugins.dragable.highlightCanvas) {
this.plugins.dragable.highlightCanvas.resetCanvas();
this.plugins.dragable.highlightCanvas = null;
}
this.plugins.dragable = {previousCursor:'auto', isOver:false};
this.plugins.dragable.dragCanvas = new DragCanvas();
this.eventCanvas._elem.before(this.plugins.dragable.dragCanvas.createElement(this._gridPadding, 'jqplot-dragable-canvas', this._plotDimensions, this));
var dctx = this.plugins.dragable.dragCanvas.setContext();
};
//$.jqplot.preInitHooks.push($.jqplot.Dragable.init);
$.jqplot.preParseSeriesOptionsHooks.push($.jqplot.Dragable.parseOptions);
$.jqplot.postDrawHooks.push($.jqplot.Dragable.postPlotDraw);
$.jqplot.eventListenerHooks.push(['jqplotMouseMove', handleMove]);
$.jqplot.eventListenerHooks.push(['jqplotMouseDown', handleDown]);
$.jqplot.eventListenerHooks.push(['jqplotMouseUp', handleUp]);
function initDragPoint(plot, neighbor) {
var s = plot.series[neighbor.seriesIndex];
var drag = s.plugins.dragable;
// first, init the mark renderer for the dragged point
var smr = s.markerRenderer;
var mr = drag.markerRenderer;
mr.style = smr.style;
mr.lineWidth = smr.lineWidth + 2.5;
mr.size = smr.size + 5;
if (!drag.color) {
var rgba = $.jqplot.getColorComponents(smr.color);
var newrgb = [rgba[0], rgba[1], rgba[2]];
var alpha = (rgba[3] >= 0.6) ? rgba[3]*0.6 : rgba[3]*(2-rgba[3]);
drag.color = 'rgba('+newrgb[0]+','+newrgb[1]+','+newrgb[2]+','+alpha+')';
}
mr.color = drag.color;
mr.init();
var start = (neighbor.pointIndex > 0) ? neighbor.pointIndex - 1 : 0;
var end = neighbor.pointIndex+2;
drag._gridData = s.gridData.slice(start, end);
}
function handleMove(ev, gridpos, datapos, neighbor, plot) {
if (plot.plugins.dragable.dragCanvas.isDragging) {
var dc = plot.plugins.dragable.dragCanvas;
var dp = dc._neighbor;
var s = plot.series[dp.seriesIndex];
var drag = s.plugins.dragable;
var gd = s.gridData;
// compute the new grid position with any constraints.
var x = (drag.constrainTo == 'y') ? dp.gridData[0] : gridpos.x;
var y = (drag.constrainTo == 'x') ? dp.gridData[1] : gridpos.y;
// compute data values for any listeners.
var xu = s._xaxis.series_p2u(x);
var yu = s._yaxis.series_p2u(y);
// clear the canvas then redraw effect at new position.
var ctx = dc._ctx;
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
// adjust our gridData for the new mouse position
if (dp.pointIndex > 0) {
drag._gridData[1] = [x, y];
}
else {
drag._gridData[0] = [x, y];
}
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}});
plot.target.trigger('jqplotSeriesPointChange', [dp.seriesIndex, dp.pointIndex, [xu,yu], [x,y]]);
}
else if (neighbor != null) {
var series = plot.series[neighbor.seriesIndex];
if (series.isDragable) {
var dc = plot.plugins.dragable.dragCanvas;
if (!dc.isOver) {
dc._cursors.push(ev.target.style.cursor);
ev.target.style.cursor = "pointer";
}
dc.isOver = true;
}
}
else if (neighbor == null) {
var dc = plot.plugins.dragable.dragCanvas;
if (dc.isOver) {
ev.target.style.cursor = dc._cursors.pop();
dc.isOver = false;
}
}
}
function handleDown(ev, gridpos, datapos, neighbor, plot) {
var dc = plot.plugins.dragable.dragCanvas;
dc._cursors.push(ev.target.style.cursor);
if (neighbor != null) {
var s = plot.series[neighbor.seriesIndex];
var drag = s.plugins.dragable;
if (s.isDragable && !dc.isDragging) {
dc._neighbor = neighbor;
dc.isDragging = true;
initDragPoint(plot, neighbor);
drag.markerRenderer.draw(s.gridData[neighbor.pointIndex][0], s.gridData[neighbor.pointIndex][1], dc._ctx);
ev.target.style.cursor = "move";
plot.target.trigger('jqplotDragStart', [neighbor.seriesIndex, neighbor.pointIndex, gridpos, datapos]);
}
}
// Just in case of a hickup, we'll clear the drag canvas and reset.
else {
var ctx = dc._ctx;
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
dc.isDragging = false;
}
}
function handleUp(ev, gridpos, datapos, neighbor, plot) {
if (plot.plugins.dragable.dragCanvas.isDragging) {
var dc = plot.plugins.dragable.dragCanvas;
// clear the canvas
var ctx = dc._ctx;
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
dc.isDragging = false;
// redraw the series canvas at the new point.
var dp = dc._neighbor;
var s = plot.series[dp.seriesIndex];
var drag = s.plugins.dragable;
// compute the new grid position with any constraints.
var x = (drag.constrainTo == 'y') ? dp.data[0] : datapos[s.xaxis];
var y = (drag.constrainTo == 'x') ? dp.data[1] : datapos[s.yaxis];
// var x = datapos[s.xaxis];
// var y = datapos[s.yaxis];
s.data[dp.pointIndex][0] = x;
s.data[dp.pointIndex][1] = y;
plot.drawSeries({preventJqPlotSeriesDrawTrigger:true}, dp.seriesIndex);
dc._neighbor = null;
ev.target.style.cursor = dc._cursors.pop();
plot.target.trigger('jqplotDragStop', [gridpos, datapos]);
}
}
})(jQuery);