goodman原生js实现自定义雷达图效果代码-html代码-BFW代码库

代码语言：html

所属分类：图表

代码描述：goodman原生js实现自定义雷达图效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>demo</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="viewport" content="width=device-width,height=device-height,inital-scale=1.0,maximum-scale=1.0,user-scalable=no;">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <meta name="format-detection" content="telephone=no">
<style>
    body{
    background-color: #292929;
}

.tab{
    margin-top: 50px;
    background-color: #fff;
    font-size: 15px;
    margin-left: 50%;
    transform: translateX(-50%);
    display: inline-block;
    box-sizing: border-box;
}
.tab_header{
    position: relative;
    background: url('//repo.bfw.wiki/bfwrepo/image/5e5ef0b278727.png');
    background-size:cover;
}
.tab_header a{
    width: 64px;
    height: 64px;
    position: absolute;;
    left: 50%;
    top: 50%;
    margin-left: -32px;;
    margin-top: -30px;
    display: block;
    z-index: 1;
    background-size: 100%;
}
.tab_header>a>img{
    width: 100%;
    height: 100%;
    display: block;
}
.tab_main{
    padding: 5px 10px;
    box-sizing: border-box;
}

.tab_main>p{
    color: #848484;
    box-sizing: border-box;

}
#controlBar{
   
}
#myCanvas{
    margin: 0 auto;
}
input{
    width: 100px;
    border: none;
    background-color: #eee;;
    padding: 5px;
}
#controlBar label{
    margin: 0 10px;
}
#controlBar div{
    padding: 5px;
}
.tab_main button{
    width: 100%;
    margin: 10px 0;
}
</style>
</head>
<body>
    <div class="tab">
        <div class="tab_header">
            <canvas id="myCanvas"></canvas>
        </div>
    
        <div class="tab_main">
            <h3>修改值来查看实时效果：</h3>
            <div id="controlBar"></div>
            <button id="load">加载</button>
        </div>
    </div>

    
    <script >
        (function(){


    class Radar{
        fontSyle="12px Arial";
        speed = 2;
        startVal = 0;
        maxValue = 80;
        textColor = "rgba(255,255,255,1)";
        background={
            rect:[
               {
                    color:"rgba(56,60,63,0.4)",
                    size:80,
               },
               {
                    color:"rgba(115,115,116,0.3)",
                    size:75,
               },
            
            ],
            circle:[
                {
                    color:"rgba(66,139,234,0.1)",
                    size:4
                },
                {
                    color:"rgba(66,139,234,1)",
                    size:2
                }
                
            ]
        }
        customizeBackground = (data)=>{
            this.background = data;
        }

        setFontStyle = (fontSyle)=>{
            this.fontSyle = fontSyle.style;
            this.textColor = fontSyle.color;
        }

        setContextSize = (width,height)=>{
        
            this.el.width=width;
            this.el.height=height;//设置好canvas的宽高
            this.c= {x:width/2,y:height/2};
        }

        setIndex = (index)=>{

            this.index = index;

        }

        getIndex = function(){
            return this.index;
        }

        constructor(options){
            this.index = options.data;
            this.el = document.querySelector(options.el);
            this.ctx = this.el.getContext("2d");
            this.maxValue = options.size;
        }

    };

    Radar.prototype.solveEquations=function(tan,isRight,val){  //解出x位置
        var sec2=Math.pow(tan,2)+1;

        var b2 = 4*Math.pow(sec2,2)*Math.pow(this.c.x,2) ;
        var ac4 = 4*sec2*(sec2*Math.pow(this.c.x,2)-Math.pow(val,2))
        var delta =b2 - ac4;

        return isRight?(2*sec2*this.c.x+ Math.sqrt(delta))/(2*sec2):(2*sec2*this.c.x- Math.sqrt(delta))/(2*sec2);
        
    }

    
    Radar.prototype.getPonit=function(n,val){  //get liner equation that we can calculate the position of points 
        var length = this.index.length;
        var alpha = 360/length; //获得内角度数 
        if(n==0)return {x:this.c.x,y:this.c.y- val};   // this.defaultValue暂时作为测试数据
        var angel=alpha*n+90; //每条直线的角度

        // console.log('angel: ',angel);

        var k = Math.tan(angel*Math.PI/180); //斜率k&tan值
        // 分布规则 
        // 把中心点x做为分界线

        var isRight = false; //标记x是否在中心点右边

        var cindex = length/2;
        //偶数情况
        if(length%2==0){  
            if(n==cindex) return {x:this.c.x,y:this.c.y + val};
            if(n<cindex)
                isRight = true;

        }else{ // 奇数情况
            cindex=parseInt(cindex);
            if(n<=cindex)
                isRight = true;
        }

        var x = this.solveEquations(k,isRight,val);
        var y = k*(x-this.c.x) + this.c.y;

        return {x: x, y:y }

        // 计算出的x值会有两个 ， 需要定一个分布规则排除其中一个
        // 只要算出x就可以得到y
    }

    Radar.prototype.creatPointArr = function(val){

        var len = this.index.length;
        var pointArr =new Array();
        for( var i =0 ;i<len ;i++){
            pointArr.push(this.getPonit(i,val));
        }

        return pointArr;
    }

    Radar.prototype.setBackground=function(){

    
        for(var i = 0;i<this.background.rect.length ;i++){
            var gap = 0;
            if(i>0) gap = Math.abs(this.background.rect[i].size-this.background.rect[i-1].size);
            this.rectangle(this.creatPointArr(this.startVal-gap));
            this.rectangleFill(this.background.rect[i].color); 
        }
     
      
        var pointArr =this.creatPointArr(this.startVal);

        // //点
        this.drawCircle(pointArr)

        //文本
        var pointArr = this.creatPointArr(this.maxValue+10);
        for( var i =0 ;i<pointArr.length ;i++){
            this.setText(this.index[i].name,pointArr[i]);
        }

        if(this.........完整代码请登录后点击上方下载按钮下载查看