js怎么封装Canvas成插件

(function(window,document){ var ChartDraws = function(options){ if(!(this instanceof ChartDraws))return new ChartDraws(options); this.options = $.extend({ //报表所需的参数 "containerId" : "", //canvas所在容器id "canvasWidth" : 400, "canvasHeight" : 300, "paddingLeft" : 20, "paddingTop" : 20, "columnChartData" :[], //柱形图的数量和对应得名称以及百分比 "yChartData" :[], //y轴的数量及名称 "axisColor" : "white", //坐标轴颜色 "columnChartColor" : "#EEE685", //柱形图颜色 "isNeedAnimation" : true, //是否需要动画 "isNeedLineChart" : true, //是否需要折线图 "isNeedColumnChart" : true, //是否需要柱形图 "lineChartColor" : "#90EE90", //折线图颜色，当isNeedLineChart=true时有效 "isNeedBorder" : false, //canvas是否需要外边框 "borderColor" : "white" //外边框颜色 },options); if(this.options.canvasWidth<=500) { this.axisBorderWidth = 3; this.fontSize = 8; } else if(this.options.canvasWidth<=800){ this.axisBorderWidth = 4; this.fontSize = 12; } else{ this.axisBorderWidth = 5; this.fontSize = 16; } var self = this; _init(); function _init(){ var canvasDom = document.createElement("canvas"); canvasDom.id = self.options.containerId+"_"+"canvas"; canvasDom.width = self.options.canvasWidth; canvasDom.height = self.options.canvasHeight; if(self.options.isNeedBorder){ canvasDom.style.borderWidth = 1; canvasDom.style.borderStyle = "solid"; canvasDom.style.borderColor = self.options.borderColor; } document.getElementById(self.options.containerId).appendChild(canvasDom); self.context = document.getElementById(self.options.containerId+"_"+"canvas"); self.ctx = self.context.getContext("2d"); _drawAxis(); } function _drawAxis(){ var XYData =transformAxis( [{x:self.options.paddingLeft,y:self.options.canvasHeight-self.options.paddingTop},{x:self.options.paddingLeft,y:self.options.paddingTop},{x:self.options.canvasWidth-self.options.paddingLeft,y:self.options.paddingTop}]); self.ctx.strokeStyle=self.options.axisColor; drawLine(self.ctx,XYData,self.axisBorderWidth); //画三角箭头 //画y轴三角箭头 drawLine(self.ctx,transformAxis([{x:self.options.paddingLeft-self.axisBorderWidth,y:self.options.canvasHeight-self.options.paddingTop-self.axisBorderWidth*2},{x:self.options.paddingLeft,y:self.options.canvasHeight-self.options.paddingTop},{x:self.options.paddingLeft+self.axisBorderWidth,y:self.options.canvasHeight-self.options.paddingTop-self.axisBorderWidth*2}]),self.axisBorderWidth); //画x轴三角箭头 drawLine(self.ctx,transformAxis([{x:self.options.canvasWidth-self.options.paddingLeft-self.axisBorderWidth*2,y:self.options.paddingTop+self.axisBorderWidth},{x:self.options.canvasWidth-self.options.paddingLeft,y:self.options.paddingTop},{x:self.options.canvasWidth-self.options.paddingLeft-self.axisBorderWidth*2,y:self.options.paddingTop-self.axisBorderWidth}]),self.axisBorderWidth); _drawCoordinatePoints(); } function _drawCoordinatePoints(){ self.reactAngleWidth = (1-2*0.04)*(self.options.canvasWidth-(2*self.options.paddingLeft))/(self.options.columnChartData.length*2-1); self.lineDataList = []; for(var i = 0;i2) { for(var i=1;i
        

         로그인 후 복사
        
       

(function(){ var lastTime = 0; var prefixes = ['ms','webkit','o','moz']; //各浏览器前缀 var requestAnimationFrame = window.requestAnimationFrame; var cancelAnimationFrame = window.cancelAnimationFrame; var prefix; //通过遍历各浏览器前缀，来得到requestAnimationFrame和cancelAnimationFrame在当前浏览器的实现形式 for( var i = 0; i < prefixes.length; i++ ) { if ( requestAnimationFrame && cancelAnimationFrame ) { break; } prefix = prefixes[i]; requestAnimationFrame = requestAnimationFrame || window[ prefix + 'RequestAnimationFrame' ]; cancelAnimationFrame = cancelAnimationFrame || window[ prefix + 'CancelAnimationFrame' ] || window[ prefix + 'CancelRequestAnimationFrame' ]; } //如果当前浏览器不支持requestAnimationFrame和cancelAnimationFrame，则会退到setTimeout if ( !requestAnimationFrame || !cancelAnimationFrame ) { requestAnimationFrame = function( callback, element ) { var currTime = new Date().getTime(); //为了使setTimteout的尽可能的接近每秒60帧的效果 var timeToCall = Math.max( 0, 16 - ( currTime - lastTime ) ); var id = window.setTimeout( function() { callback( currTime + timeToCall ); }, timeToCall ); lastTime = currTime + timeToCall; return id; }; cancelAnimationFrame = function( id ) { window.clearTimeout( id ); }; } window.requestAnimationFrame = requestAnimationFrame; window.cancelAnimationFrame = cancelAnimationFrame; }());