chart.js

dojo-0.3.0-ajax开 源 项 目

		rect.setAttribute("height", this.properties.height-this.properties.padding.bottom-this.properties.padding.bottom);
		rect.setAttribute("fill", "#fff");
		this.plotArea.appendChild(rect);

		//	data group
		this.dataGroup = document.createElementNS(dojo.svg.xmlns.svg, "g");
		this.dataGroup.setAttribute("style","clip-path:url(#plotClip"+this.widgetId+");");
		this.plotArea.appendChild(this.dataGroup);

		//	axis group
		this.axisGroup = document.createElementNS(dojo.svg.xmlns.svg, "g");
		this.plotArea.appendChild(this.axisGroup);

		//	x axis
		var stroke=1;
		var line = document.createElementNS(dojo.svg.xmlns.svg, "line");
		var y=dojo.widget.svg.Chart.Plotter.getY(this.properties.axes.x.plotAt, this);
		line.setAttribute("y1", y);
		line.setAttribute("y2", y);
		line.setAttribute("x1",this.properties.padding.left-stroke);
		line.setAttribute("x2",this.properties.width-this.properties.padding.right);
		line.setAttribute("style","stroke:#000;stroke-width:"+stroke+";");
		this.axisGroup.appendChild(line);
		
		//	x axis units.
		//	(min and max)
		var textSize=10;
		var text = document.createElementNS(dojo.svg.xmlns.svg, "text");
		text.setAttribute("x", this.properties.padding.left);
		text.setAttribute("y", this.properties.height-this.properties.padding.bottom+textSize+2);
		text.setAttribute("style", "text-anchor:middle;font-size:"+textSize+"px;fill:#000;");
		text.appendChild(document.createTextNode(dojo.math.round(parseFloat(this.properties.axes.x.range.min),2)));
		this.axisGroup.appendChild(text);
		
		var text = document.createElementNS(dojo.svg.xmlns.svg, "text");
		text.setAttribute("x", this.properties.width-this.properties.padding.right-(textSize/2));
		text.setAttribute("y", this.properties.height-this.properties.padding.bottom+textSize+2);
		text.setAttribute("style", "text-anchor:middle;font-size:"+textSize+"px;fill:#000;");
		text.appendChild(document.createTextNode(dojo.math.round(parseFloat(this.properties.axes.x.range.max),2)));
		this.axisGroup.appendChild(text);	
		
		//	y axis
		var line=document.createElementNS(dojo.svg.xmlns.svg, "line");
		var x=dojo.widget.svg.Chart.Plotter.getX(this.properties.axes.y.plotAt, this);
		line.setAttribute("x1", x);
		line.setAttribute("x2", x);
		line.setAttribute("y1", this.properties.padding.top);
		line.setAttribute("y2", this.properties.height-this.properties.padding.bottom);
		line.setAttribute("style", "stroke:#000;stroke-width:"+stroke+";");
		this.axisGroup.appendChild(line);

		//	y axis units
		var text = document.createElementNS(dojo.svg.xmlns.svg, "text");
		text.setAttribute("x", this.properties.padding.left-4);
		text.setAttribute("y", this.properties.height-this.properties.padding.bottom);
		text.setAttribute("style", "text-anchor:end;font-size:"+textSize+"px;fill:#000;");
		text.appendChild(document.createTextNode(dojo.math.round(parseFloat(this.properties.axes.y.range.min),2)));
		this.axisGroup.appendChild(text);
		
		var text = document.createElementNS(dojo.svg.xmlns.svg, "text");
		text.setAttribute("x", this.properties.padding.left-4);
		text.setAttribute("y", this.properties.padding.top+(textSize/2));
		text.setAttribute("style", "text-anchor:end;font-size:"+textSize+"px;fill:#000;");
		text.appendChild(document.createTextNode(dojo.math.round(parseFloat(this.properties.axes.y.range.max),2)));
		this.axisGroup.appendChild(text);	

		this.domNode.appendChild(this.vectorNode);
		dojo.svg.g.resume();

		//	this is last.
		this.assignColors();
		this._isInitialized=true;
	},
	destroy:function(){
		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(){
		dojo.svg.g.suspend();
		
		if (this.dataGroup){
			while(this.dataGroup.childNodes.length>0){
				this.dataGroup.removeChild(this.dataGroup.childNodes.item(0));
			}
		} else {
			this.initialize();
		}

		//	the remove/append is an attempt to streamline the rendering, it's totally optional
//		var p=this.dataGroup.parentNode;
//		p.removeChild(this.dataGroup);
		for(var i=0; i<this.series.length; i++){
			dojo.widget.svg.Chart.Plotter.plot(this.series[i], this);
		}
//		p.appendChild(this.dataGroup);
		
		dojo.svg.g.resume();
	}
});

dojo.widget.svg.Chart.Plotter=new function(){
	var _this=this;
	var plotters = {};
	var types=dojo.widget.Chart.PlotTypes;
	
	this.getX=function(value, chart){
		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;
	};
	this.getY=function(value, chart){
		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;
	};

	this.addPlotter=function(name, func){
		plotters[name]=func;
	};
	this.plot=function(series, chart){
		if (series.values.length==0) return;
		if (series.plotType && plotters[series.plotType]){
			return plotters[series.plotType](series, chart);
		}
		else if (chart.plotType && plotters[chart.plotType]){
			return plotters[chart.plotType](series, chart);
		}
	};

	//	plotting
	plotters[types.Bar]=function(series, chart){
		var space=1;
		var lastW = 0;
		for (var i=0; i<series.values.length; i++){
			var x=_this.getX(series.values[i].x, chart);
			var w;
			if (i==series.values.length-1){
				w=lastW;
			} else{
				w=_this.getX(series.values[i+1].x, chart)-x-space;
				lastW=w;
			}
			x-=(w/2);

			var yA=_this.getY(chart.properties.axes.x.plotAt, chart);
			var y=_this.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[types.Line]=function(series, chart){
		var tension=3;
		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 = _this.getX(series.values[i].x, chart)
			var y = _this.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-_this.getX(series.values[i-1].x, chart);
				dy=_this.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[types.Scatter]=function(series, chart){
		var r=7;
		for (var i=0; i<series.values.length; i++){
			var x=_this.getX(series.values[i].x, chart);
			var y=_this.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[types.Bubble]=function(series, chart){
		//	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; v+=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", _this.getX(series.values[i].x, chart));
			point.setAttribute("cy", _this.getY(series.values[i].value, chart));
			point.setAttribute("title", series.label + ": " + series.values[i].value + " (" + size + ")");
			chart.dataGroup.appendChild(point);
		}
	};
}();