js封裝成插件_Canvas統(tǒng)計圖插件編寫實例_javascript技巧

來源：懂視網(wǎng) 責(zé)編：小OO 時間：2020-11-27 20:05:06

js封裝成插件_Canvas統(tǒng)計圖插件編寫實例_javascript技巧

之前就說過，我想寫一個canvas畫統(tǒng)計圖的插件，現(xiàn)在寫好了。先說下實現(xiàn)的功能吧。1.可以通過自定義X軸坐標(biāo)屬性和Y軸坐標(biāo)屬性按比例畫出統(tǒng)計圖。2.可以選擇畫折現(xiàn)圖還是柱形統(tǒng)計圖，或者兩者都實現(xiàn)。3.可以自由定義折現(xiàn)顏色，坐標(biāo)顏色，柱形圖顏色和canvas邊框顏色，當(dāng)然邊框你也可以選擇要或者不要。4.可以選擇是否實現(xiàn)柱形圖和折現(xiàn)圖的動畫實現(xiàn)。實現(xiàn)過程；畫坐標(biāo)——畫箭頭——做X軸和Y軸的標(biāo)注——畫柱形圖——畫折現(xiàn)圖。話不多說，上代碼；

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導(dǎo)讀之前就說過，我想寫一個canvas畫統(tǒng)計圖的插件，現(xiàn)在寫好了。先說下實現(xiàn)的功能吧。1.可以通過自定義X軸坐標(biāo)屬性和Y軸坐標(biāo)屬性按比例畫出統(tǒng)計圖。2.可以選擇畫折現(xiàn)圖還是柱形統(tǒng)計圖，或者兩者都實現(xiàn)。3.可以自由定義折現(xiàn)顏色，坐標(biāo)顏色，柱形圖顏色和canvas邊框顏色，當(dāng)然邊框你也可以選擇要或者不要。4.可以選擇是否實現(xiàn)柱形圖和折現(xiàn)圖的動畫實現(xiàn)。實現(xiàn)過程；畫坐標(biāo)——畫箭頭——做X軸和Y軸的標(biāo)注——畫柱形圖——畫折現(xiàn)圖。話不多說，上代碼；

下面小編就為大家?guī)硪黄猨s封裝成插件_Canvas統(tǒng)計圖插件編寫實例。小編覺得挺不錯的，現(xiàn)在就分享js源碼給大家，也給大家做個參考。對js感興趣的一起跟隨小編過來看看吧

之前就說過，我想寫一個canvas畫統(tǒng)計圖的插件，現(xiàn)在寫好了

先說下實現(xiàn)的功能吧：

　　1.可以通過自定義X軸坐標(biāo)屬性和Y軸坐標(biāo)屬性按比例畫出統(tǒng)計圖

　　2.可以選擇畫折現(xiàn)圖還是柱形統(tǒng)計圖，或者兩者都實現(xiàn)

　　3.可以自由定義折現(xiàn)顏色，坐標(biāo)顏色，柱形圖顏色和canvas邊框顏色，當(dāng)然邊框你也可以選擇要或者不要

　　4.可以選擇是否實現(xiàn)柱形圖和折現(xiàn)圖的動畫實現(xiàn)

實現(xiàn)過程

畫坐標(biāo)——畫箭頭——做X軸和Y軸的標(biāo)注——畫柱形圖——畫折現(xiàn)圖

話不多說，上代碼

(function(window,document){
 var ChartDraws = function(options){
 if(!(this instanceof ChartDraws))return new ChartDraws(options);
 this.options = $.extend({
 //報表所需的參數(shù)
 "containerId" : "", //canvas所在容器id
 "canvasWidth" : 400,
 "canvasHeight" : 300,
 "paddingLeft" : 20,
 "paddingTop" : 20,
 "columnChartData" :[], //柱形圖的數(shù)量和對應(yīng)得名稱以及百分比
 "yChartData" :[], //y軸的數(shù)量及名稱
 "axisColor" : "white", //坐標(biāo)軸顏色
 "columnChartColor" : "#EEE685", //柱形圖顏色
 "isNeedAnimation" : true, //是否需要動畫
 "isNeedLineChart" : true, //是否需要折線圖
 "isNeedColumnChart" : true, //是否需要柱形圖
 "lineChartColor" : "#90EE90", //折線圖顏色，當(dāng)isNeedLineChart=true時有效
 "isNeedBorder" : false, //canvas是否需要外邊框
 "borderColor" : "white" //外邊框顏色
 },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);
 //畫三角箭頭
 //畫y軸三角箭頭
 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);
 //畫x軸三角箭頭
 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;i<self.options.columnChartData.length;i++)
 {
 drawXText(self.ctx,2*self.options.columnChartData[i].NO*self.reactAngleWidth+self.options.paddingLeft+0.04*(self.options.canvasWidth-(2*self.options.paddingLeft))+self.reactAngleWidth/2,self.options.paddingTop/2,self.options.columnChartData[i].Name);
 self.lineDataList.push({
 x:2*self.options.columnChartData[i].NO*self.reactAngleWidth+self.options.paddingLeft+0.04*(self.options.canvasWidth-(2*self.options.paddingLeft))+self.reactAngleWidth/2,
 y:self.options.canvasHeight-(self.options.paddingTop+(self.options.canvasHeight-2*self.options.paddingTop)*self.options.columnChartData[i].PT)
 })
 }

 //畫Y軸title 畫y軸虛線
 self.reactAngleHeight = (self.options.canvasHeight-2*self.options.paddingTop)/(self.options.yChartData.length+1);
 for(var j = 0;j<self.options.yChartData.length;j++)
 {
 drawYText(self.ctx,3*self.options.paddingLeft/4,self.options.paddingTop+self.reactAngleHeight*(j+1),self.options.yChartData[j].Name);
 //畫虛線
 drawDottedLine(self.ctx,self.options.paddingLeft,self.options.paddingTop+self.reactAngleHeight*(j+1),self.options.canvasWidth-self.options.paddingLeft,self.options.paddingTop+self.reactAngleHeight*(j+1),self.options.canvasWidth-2*self.options.paddingLeft,10,self.axisBorderWidth/2);
 }
 _drawColumnChart();
 }

 function _drawColumnChart(){
 //柱形圖循環(huán)
 var reactAngleTimer = 1;
 function loopColumnChart()
 {
 var columnChartLooped = window.requestAnimationFrame(loopColumnChart);
 if(reactAngleTimer<=100)
 {
 for(var k=0;k<self.options.columnChartData.length;k++)
 {
 self.ctx.fillStyle =self.options.columnChartColor;
 drawRectangle(self.ctx,self.lineDataList[k].x-self.reactAngleWidth/2,self.options.canvasHeight-((self.options.canvasHeight-2*self.options.paddingTop)*self.options.columnChartData[k].PT*reactAngleTimer/100+self.options.paddingTop),self.reactAngleWidth,(self.options.canvasHeight-2*self.options.paddingTop)*self.options.columnChartData[k].PT*reactAngleTimer/100);
 }
 reactAngleTimer++;
 }
 else
 {
 window.cancelAnimationFrame(columnChartLooped);
 columnChartLooped = null;
 reactAngleTimer = 1;
 if(self.options.isNeedLineChart)
 {
 loopLineChart();
 }
 }
 }
 //折線圖循環(huán)
 var lineTimer = 0;
 function loopLineChart()
 {
 var lineChartLooped = window.requestAnimationFrame(loopLineChart);
 if(lineTimer<self.lineDataList.length-1)
 {
 self.ctx.lineWidth = 2*self.axisBorderWidth/3;
 if(lineTimer == 0)
 {
 drawCircle(self.ctx,self.lineDataList[lineTimer].x,self.lineDataList[lineTimer].y);
 }
 drawCircle(self.ctx,self.lineDataList[lineTimer+1].x,self.lineDataList[lineTimer+1].y);
 self.ctx.beginPath();
 self.ctx.moveTo(self.lineDataList[lineTimer].x,self.lineDataList[lineTimer].y);
 self.ctx.lineTo(self.lineDataList[lineTimer+1].x,self.lineDataList[lineTimer+1].y);
 self.ctx.strokeStyle = self.options.lineChartColor;
 self.ctx.lineWidth = 2*self.axisBorderWidth/3;
 self.ctx.stroke();
 lineTimer++;
 }
 else
 {
 window.cancelAnimationFrame(lineChartLooped);
 lineChartLooped = null;
 lineTimer = 0;
 }
 }
 //畫柱形圖
 function drawRectangle(context,x,y,width,height){
 context.beginPath();
 context.fillRect(x,y,width,height);
 }
 //畫圓
 function drawCircle(context,x,y){
 context.beginPath();
 context.arc(x,y,self.axisBorderWidth/2,0,2*Math.PI,true);
 context.strokeStyle=self.options.lineChartColor;
 context.stroke();
 context.closePath();
 }
 if(self.options.isNeedAnimation)
 {
 if(self.options.isNeedColumnChart)
 {
 loopColumnChart();
 }
 else
 {
 if(self.options.isNeedLineChart) {
 loopLineChart();
 }
 }
 }
 else
 {
 if(self.options.isNeedColumnChart)
 {
 for(var k=0;k<self.options.columnChartData.length;k++)
 {
 self.ctx.fillStyle =self.options.columnChartColor;
 drawRectangle(self.ctx,self.lineDataList[k].x-self.reactAngleWidth/2,self.options.canvasHeight-((self.options.canvasHeight-2*self.options.paddingTop)*self.options.columnChartData[k].PT+self.options.paddingTop),self.reactAngleWidth,(self.options.canvasHeight-2*self.options.paddingTop)*self.options.columnChartData[k].PT);
 }
 }
 if(self.options.isNeedLineChart) {
 for (var l = 0; l < self.lineDataList.length - 1; l++) {
 self.ctx.lineWidth = 4;
 if (l == 0) {
 drawCircle(self.ctx, self.lineDataList[l].x, self.lineDataList[l].y);
 }
 drawCircle(self.ctx, self.lineDataList[l + 1].x, self.lineDataList[l + 1].y);
 self.ctx.beginPath();
 self.ctx.moveTo(self.lineDataList[l].x, self.lineDataList[l].y);
 self.ctx.lineTo(self.lineDataList[l + 1].x, self.lineDataList[l + 1].y);
 self.ctx.strokeStyle = self.options.lineChartColor;
 self.ctx.lineWidth = 2*self.axisBorderWidth/3;
 self.ctx.stroke();
 }
 }
 }
 }


 function transformAxis(data)
 {
 var newData=[];
 for(var i=0;i<data.length;i++){
 newData.push({
 x:data[i].x,
 y:self.options.canvasHeight-data[i].y
 })
 }
 return newData;
 }

 function drawLine(context,point,width){
 context.beginPath();
 context.moveTo(point[0].x,point[0].y);
 if(point.length>2)
 {
 for(var i=1;i<point.length;i++)
 {
 context.lineTo(point[i].x,point[i].y);
 }
 }
 context.lineWidth = width;
 context.lineJoin='round';
 context.stroke();
 context.closePath();
 }

 //畫y軸title
 function drawYText(context,x,y,str) {
 context.beginPath();
 context.font = '{fontSize} Microsoft Yahei'.replace("{fontSize}",self.fontSize+"px");
 context.fillStyle = 'white';
 context.textAlign = 'right';
 context.fillText(str,x,self.options.canvasHeight-y);
 context.closePath();
 }
 //畫x軸title
 function drawXText(context,x,y,str) {
 context.beginPath();
 context.font = '{fontSize} Microsoft Yahei'.replace("{fontSize}",self.fontSize+"px");
 context.fillStyle = 'white';
 context.textAlign = 'center';
 context.fillText(str,x,self.options.canvasHeight-y);
 context.closePath();
 }
 function drawDottedLine(context,x1,y1,x2,y2,totalLength,length,lineWidth){
 y1 = self.options.canvasHeight-y1;
 y2 = self.options.canvasHeight-y2;
 var dashLen = length === undefined ? 5 : length;
 //計算有多少個線段
 context.beginPath();
 var num = Math.floor(totalLength/dashLen);
 context.lineWidth = lineWidth;
 for(var i = 0 ; i < num; i++)
 {
 context[i%2==0 ? 'moveTo' : 'lineTo'](x1+(x2-x1)/num*i,y1+(y2-y1)/num*i);
 }
 context.stroke();
 }
 };
 window.ChartDraws = ChartDraws;
}(window,document));

下面還有一個是實現(xiàn)requestAnimationFrame瀏覽器兼容的

(function(){
 var lastTime = 0;
 var prefixes = ['ms','webkit','o','moz']; //各瀏覽器前綴

 var requestAnimationFrame = window.requestAnimationFrame;
 var cancelAnimationFrame = window.cancelAnimationFrame;

 var prefix;
 //通過遍歷各瀏覽器前綴，來得到requestAnimationFrame和cancelAnimationFrame在當(dāng)前瀏覽器的實現(xiàn)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' ];
 }

 //如果當(dāng)前瀏覽器不支持requestAnimationFrame和cancelAnimationFrame，則會退到setTimeout
 if ( !requestAnimationFrame || !cancelAnimationFrame ) {
 requestAnimationFrame = function( callback, element ) {
 var currTime = new Date().getTime();
 //為了使setTimteout的盡可能的接近每秒60幀的效果
 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;
}());

附上<script>調(diào)用

ChartDraws({
 "containerId" : "chart1", //canvas所在容器id
 "canvasWidth" : 1000,
 "canvasHeight" : 250,
 "paddingLeft" : 50,
 "paddingTop" : 50,
 "columnChartData": [
 {NO:0,PT:0.2,Name:"Html/Css"},
 {NO:1,PT:0.4,Name:"Html5/Css3"},
 {NO:2,PT:0.4,Name:"JavaScript"},
 {NO:3,PT:0.5,Name:"JQuery"},
 {NO:4,PT:0.2,Name:"Angular.js"},
 {NO:5,PT:0.8,Name:"BootStrap"},
 {NO:6,PT:0.6,Name:"React.js"},
 {NO:7,PT:0.5,Name:"Java"}
 ],
 "yChartData" : [
 {NO:0,Name:"熟悉"},
 {NO:1,Name:"掌握"},
 {NO:2,Name:"精通"}
 ],
 "isNeedAnimation" : false,
 "isNeedBorder" : false,
 "isNeedLineChart":true,
 "axisColor" : "#8DEEEE"
 });
 ChartDraws({
 "containerId" : "chart2", //canvas所在容器id
 "canvasWidth" : 1000,
 "canvasHeight" : 250,
 "paddingLeft" : 50,
 "paddingTop" : 50,
 "columnChartData": [
 {NO:0,PT:0.4,Name:"Html/Css"},
 {NO:1,PT:0.5,Name:"Html5/Css3"},
 {NO:2,PT:0.2,Name:"JavaScript"},
 {NO:3,PT:0.7,Name:"JQuery"},
 {NO:4,PT:0.2,Name:"Angular.js"},
 {NO:5,PT:0.3,Name:"BootStrap"},
 {NO:6,PT:0.8,Name:"React.js"},
 {NO:7,PT:0.2,Name:"Java"}
 ],
 "yChartData" : [
 {NO:0,Name:"熟悉"},
 {NO:1,Name:"掌握"},
 {NO:2,Name:"精通"}
 ],
 "isNeedAnimation" : false,
 "isNeedBorder" : false,
 "isNeedLineChart":false,
 "isNeedColumnChart" : true,
 "columnChartColor":"#9370DB"
 });

 ChartDraws({
 "containerId" : "chart3", //canvas所在容器id
 "canvasWidth" : 1000,
 "canvasHeight" : 250,
 "paddingLeft" : 50,
 "paddingTop" : 50,
 "columnChartData": [
 {NO:0,PT:0.4,Name:"Html/Css"},
 {NO:1,PT:0.5,Name:"Html5/Css3"},
 {NO:2,PT:0.2,Name:"JavaScript"},
 {NO:3,PT:0.7,Name:"JQuery"},
 {NO:4,PT:0.2,Name:"Angular.js"},
 {NO:5,PT:0.3,Name:"BootStrap"},
 {NO:6,PT:0.8,Name:"React.js"},
 {NO:7,PT:0.2,Name:"Java"}
 ],
 "yChartData" : [
 {NO:0,Name:"熟悉"},
 {NO:1,Name:"掌握"},
 {NO:2,Name:"精通"}
 ],
 "isNeedAnimation" : false,
 "isNeedBorder" : true,
 "isNeedLineChart":true,
 "isNeedColumnChart" : false,
 "lineChartColor" : "#8DB6CD",
 "borderColor" : "#87CEFA"
 })

html代碼

<p class="section">
 <p id="chart1"></p>
 <p id="chart2"></p>
 <p id="chart3"></p>
 </p>

下面是一個實現(xiàn)后的效果圖

在整個編碼的過程中我把代碼改過一次，為什么改呢，因為在第一次的時候我在js里面使用了大量的 ChartDraws.prototype.XXXX = function(){};

后來我一想不對啊，我為什么要把這么多的方法暴露給外部呢......這不是沒事找事么.......

所以現(xiàn)在就改成這樣了，如果有不對的地方和可以改進(jìn)的地方，希望路過的指點下，謝謝！還有那個白條代碼背景怎么刪不掉...........

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js封裝成插件_Canvas統(tǒng)計圖插件編寫實例_javascript技巧

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js封裝成插件_Canvas統(tǒng)計圖插件編寫實例_javascript技巧

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js封裝成插件_Canvas統(tǒng)計圖插件編寫實例_javascript技巧

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