chart.js

dojo-0.4.0-ajax.zip ajax一个应用。在页面上可以直接用标签。此为ajax的框架

			//	set up the chart; each is a method so that it can be selectively overridden.
			this.drawVectorNode();
			this.drawPlotArea();
			this.drawDataGroup();
			this.drawAxes();

			//	this is last.
			this.domNode.appendChild(this.vectorNode);
			this.assignColors();
			this._isInitialized=true;
		},
		destroy:function(){
			//	summary
			//	Node cleanup
			while(this.domNode.childNodes.length>0){
				this.domNode.removeChild(this.domNode.childNodes.item(0));
			}
			this.vectorNode=this.plotArea=this.dataGroup=this.axisGroup=null;
		},
		render:function(){
			//	summary
			//	Draws the data on the chart
			dojo.svg.g.suspend();
			
			if (this.dataGroup){
				while(this.dataGroup.childNodes.length>0){
					this.dataGroup.removeChild(this.dataGroup.childNodes.item(0));
				}
			} else {
				this.init();
			}

			//	plot it.
			for(var i=0; i<this.series.length; i++){
				dojo.widget.svg.Chart.Plotter.plot(this.series[i], this);
			}
			dojo.svg.g.resume();
		},
		postCreate:function(){
			//	summary
			//	Parse any data if included with the chart, and kick off the rendering.
			var table=this.domNode.getElementsByTagName("table")[0];
			if (table){
				var ranges=this.parseProperties(table);
				var bRangeX=false;
				var bRangeY=false;
			
				//	fix the axes
				var axisValues = this.parseData(table);
				if(!bRangeX){
					this.properties.axes.x.range={min:axisValues.x.min, max:axisValues.x.max};
				}
				if(!bRangeY){
					this.properties.axes.y.range={min:axisValues.y.min, max:axisValues.y.max};
				}
				this.setAxesPlot(table);

				//	table values should be populated, now pop it off.
				this.domNode.removeChild(table);
			}
			if(this.series.length>0){
				this.render();
			}
		}
	}
);

dojo.widget.svg.Chart.Plotter=new function(){
	//	summary
	//	Singleton for plotting series of data.
	var self=this;
	var plotters = {};
	var types=dojo.widget.Chart.PlotTypes;
	
	this.getX=function(/* string||number */value, /* dojo.widget.Chart */chart){
		//	summary
		//	Calculate the x coord on the passed chart for the passed value
		var v=parseFloat(value);
		var min=chart.properties.axes.x.range.min;
		var max=chart.properties.axes.x.range.max;
		var ofst=0-min;
		min+=ofst; max+=ofst; v+=ofst;

		var xmin=chart.properties.padding.left;
		var xmax=chart.properties.width-chart.properties.padding.right;
		var x=(v*((xmax-xmin)/max))+xmin;
		return x;	// float
	};
	this.getY=function(/* string||number */value, /* dojo.widget.Chart */chart){
		//	summary
		//	Calculate the y coord on the passed chart for the passed value
		var v=parseFloat(value);
		var max=chart.properties.axes.y.range.max;
		var min=chart.properties.axes.y.range.min;
		var ofst=0;
		if(min<0)ofst+=Math.abs(min);
		min+=ofst; max+=ofst; v+=ofst;
		
		var ymin=chart.properties.height-chart.properties.padding.bottom;
		var ymax=chart.properties.padding.top;
		var y=(((ymin-ymax)/(max-min))*(max-v))+ymax;
		return y;	// float
	};

	this.addPlotter=function(/* string */name, /* function */func){
		//	summary
		//	add a custom plotter function to this object.
		plotters[name]=func;
	};
	this.plot=function(/* dojo.widget.Chart.DataSeries */series, /* dojo.widget.Chart */chart){
		//	summary
		//	plot the passed series.
		if (series.values.length==0) return;	//	void
		if (series.plotType && plotters[series.plotType]){
			return plotters[series.plotType](series, chart);	//	void
		}
		else if (chart.plotType && plotters[chart.plotType]){
			return plotters[chart.plotType](series, chart);		//	void
		}
	};

	//	plotting
	plotters["bar"]=function(/* dojo.widget.Chart.DataSeries */series, /* dojo.widget.Chart */chart){
		//	summary
		//	plot the passed series as a set of bars.
		var space=1;
		var lastW = 0;
		for (var i=0; i<series.values.length; i++){
			var x=self.getX(series.values[i].x, chart);
			var w;
			if (i==series.values.length-1){
				w=lastW;
			} else{
				w=self.getX(series.values[i+1].x, chart)-x-space;
				lastW=w;
			}
			x-=(w/2);

			var yA=self.getY(chart.properties.axes.x.plotAt, chart);
			var y=self.getY(series.values[i].value, chart);
			var h=Math.abs(yA-y);
			if (parseFloat(series.values[i].value)<chart.properties.axes.x.plotAt){
				var oy=yA;
				yA=y;
				y=oy;
			}

			var bar=document.createElementNS(dojo.svg.xmlns.svg, "rect");
			bar.setAttribute("fill", series.color);
			bar.setAttribute("title", series.label + ": " + series.values[i].value);
			bar.setAttribute("stroke-width", "0");
			bar.setAttribute("x", x);
			bar.setAttribute("y", y);
			bar.setAttribute("width", w);
			bar.setAttribute("height", h);
			bar.setAttribute("fill-opacity", "0.9");
			chart.dataGroup.appendChild(bar);
		}
	};
	plotters["line"]=function(/* dojo.widget.Chart.DataSeries */series, /* dojo.widget.Chart */chart){
		//	summary
		//	plot the passed series as a line with tensioning
		var tension=1.5;
		var line = document.createElementNS(dojo.svg.xmlns.svg, "path");
		line.setAttribute("fill", "none");
		line.setAttribute("stroke", series.color);
		line.setAttribute("stroke-width", "2");
		line.setAttribute("stroke-opacity", "0.85");
		line.setAttribute("title", series.label);
		chart.dataGroup.appendChild(line);

		var path = [];
		for (var i=0; i<series.values.length; i++){
			var x = self.getX(series.values[i].x, chart)
			var y = self.getY(series.values[i].value, chart);

			var dx = chart.properties.padding.left+1;
			var dy = chart.properties.height-chart.properties.padding.bottom;
			if (i>0){
				dx=x-self.getX(series.values[i-1].x, chart);
				dy=self.getY(series.values[i-1].value, chart);
			}
			
			if (i==0) path.push("M");
			else {
				path.push("C");
				var cx=x-(tension-1)*(dx/tension);
				path.push(cx+","+dy);
				cx=x-(dx/tension);
				path.push(cx+","+y);
			}
			path.push(x+","+y);
		}
		line.setAttribute("d", path.join(" "));
	};
	plotters["area"]=function(/* dojo.widget.Chart.DataSeries */series, /* dojo.widget.Chart */chart){
		//	summary
		//	plot the passed series as an area with tensioning.
		var tension=1.5;
		var line = document.createElementNS(dojo.svg.xmlns.svg, "path");
		line.setAttribute("fill", series.color);
		line.setAttribute("fill-opacity", "0.4");
		line.setAttribute("stroke", series.color);
		line.setAttribute("stroke-width", "1");
		line.setAttribute("stroke-opacity", "0.8");
		line.setAttribute("title", series.label);
		chart.dataGroup.appendChild(line);

		var path = [];
		for (var i=0; i<series.values.length; i++){
			var x = self.getX(series.values[i].x, chart)
			var y = self.getY(series.values[i].value, chart);

			var dx = chart.properties.padding.left+1;
			var dy = chart.properties.height-chart.properties.padding.bottom;
			if (i>0){
				dx=x-self.getX(series.values[i-1].x, chart);
				dy=self.getY(series.values[i-1].value, chart);
			}
			
			if (i==0) path.push("M");
			else {
				path.push("C");
				var cx=x-(tension-1)*(dx/tension);
				path.push(cx+","+dy);
				cx=x-(dx/tension);
				path.push(cx+","+y);
			}
			path.push(x+","+y);
		}
		//	finish it off
		path.push("L");
		path.push(x + "," + self.getY(0, chart));
		path.push("L");
		path.push(self.getX(0, chart) + "," + self.getY(0, chart));
		path.push("Z");
		line.setAttribute("d", path.join(" "));
	},
	plotters["scatter"]=function(/* dojo.widget.Chart.DataSeries */series, /* dojo.widget.Chart */chart){
		//	summary
		//	plot the passed series as a scatter chart
		var r=7;
		for (var i=0; i<series.values.length; i++){
			var x=self.getX(series.values[i].x, chart);
			var y=self.getY(series.values[i].value, chart);
			var point = document.createElementNS(dojo.svg.xmlns.svg, "path");
			point.setAttribute("fill", series.color);
			point.setAttribute("stroke-width", "0");
			point.setAttribute("title", series.label + ": " + series.values[i].value);
			point.setAttribute("d",
				"M " + x + "," + (y-r) + " " +
				"Q " + x + "," + y + " " + (x+r) + "," + y + " " +
				"Q " + x + "," + y + " " + x + "," + (y+r) + " " +
				"Q " + x + "," + y + " " + (x-r) + "," + y + " " +
				"Q " + x + "," + y + " " + x + "," + (y-r) + " " +
				"Z"
			);
			chart.dataGroup.appendChild(point);
		}
	};
	plotters["bubble"]=function(/* dojo.widget.Chart.DataSeries */series, /* dojo.widget.Chart */chart){
		//	summary
		//	plot the passed series as a series of bubbles (scatter with 3rd dimension)
		//	added param for series[n].value: size
		var minR=1;
		
		//	do this off the x axis?
		var min=chart.properties.axes.x.range.min;
		var max=chart.properties.axes.x.range.max;
		var ofst=0-min;
		min+=ofst; max+=ofst;

		var xmin=chart.properties.padding.left;
		var xmax=chart.properties.width-chart.properties.padding.right;
		var factor=(max-min)/(xmax-xmin)*25;
		
		for (var i=0; i<series.values.length; i++){
			var size = series.values[i].size;
			if (isNaN(parseFloat(size))) size=minR;
			var point=document.createElementNS(dojo.svg.xmlns.svg, "circle");
			point.setAttribute("stroke-width", 0);
			point.setAttribute("fill", series.color);
			point.setAttribute("fill-opacity", "0.8");
			point.setAttribute("r", (parseFloat(size)*factor)/2);
			point.setAttribute("cx", self.getX(series.values[i].x, chart));
			point.setAttribute("cy", self.getY(series.values[i].value, chart));
			point.setAttribute("title", series.label + ": " + series.values[i].value + " (" + size + ")");
			chart.dataGroup.appendChild(point);
		}
	};
}();