原生js实现饼图_百分比饼状原生js

作者：我家自动化 | 2024-02-23 01:16:24
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百分比饼状原生js

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>饼图</title>
    <style>
        #canvas{
            border:1px solid #ccc;
        }
        .coverDiv {
            position: absolute;
            display: none;
            z-index: 999999999;
            left: 0;
            top: 0;
            background-color: #fff;
            border-style: solid;
            white-space: nowrap;
            z-index: 9999999;
            background-color: rgba(50, 50, 50, 0.7);
            border-width: 0px;
            border-color: rgb(51, 51, 51);
            border-radius: 4px;
            color: rgb(255, 255, 255);
            font: 14px / 21px "Microsoft YaHei";
            padding: 5px;
        }
        .title {
            position: absolute;
            left: 300px;
            top: 35px;
            font-size: 26px;
        }
    </style>
</head>
<body>
        <canvas id="canvas"></canvas>
        <div class="coverDiv"></div>
        <div class="title">周一到周五的人数</div>
</body>
<script>
        var inputData =[21,12,51,35,63]
        var inputText =['星期一','星期二','星期三','星期四','星期五']
        var colorList=['#000','skyblue','#666','pink','red']
        var title='周一到周五的人数'
 
        //小矩形距横向间距
        var spaceX=10;
        //小矩形距纵向间距
        var spaceY=20;
        //小矩形的宽度
        var smallW=30;
        //小矩形的宽度
        this.smallH=15;
 
 
 
 
 
 
        
        // 鼠标移动是坐标
        var  mousePosition= {}
        var mouseTimer
 
        // div覆盖显示
        var isSelect=false
        var coverDiv=document.querySelector('.coverDiv')
        var isMouseIn=false
 
        // 画布大小
        var canvasWidth='800';
        var canvasHeight='650';
        var canvas = document.getElementById('canvas');
        var context = canvas.getContext('2d');
        canvas.width=canvasWidth;
        canvas.height=canvasHeight;
        draw()
 
 
        function drawCircle(startAngle,endAngle,data,i) {
            context.beginPath();
            context.moveTo(400,350);
            context.arc(400, 350, 200, startAngle, endAngle, false);
            var isSelect=context.isPointInPath(mousePosition.x, mousePosition.y)
            if (isSelect) {
                context.closePath();
                context.beginPath();
                context.moveTo(400,350);
                context.arc(400, 350, 210, startAngle, endAngle, false);
                coverDiv.style.left=mousePosition.x+10+'px'
                coverDiv.style.top=mousePosition.y+10+'px'
                coverDiv.style.display='block'
                let rate=data.scale.toFixed(2)*100
                rate=rate.toFixed(0)
                coverDiv.innerHTML=`${title}<br>${inputText[i]}: ${inputData[i]} ${rate}%`
            }
            context.closePath();
            context.fillStyle = data.color;
            context.fill()
            context.strokeStyle = '#fff';
            // 留空白
            context.lineWidth = 2;
            context.stroke();
        }
        function handleData(inputData) {
            // 把inputData变成比例
            let dataNew = [];
            let total = 0;
            for (var i = 0; i < inputData.length; i++) {
                total += inputData[i];
            }
            var radianStart=0
            for (var i = 0; i < inputData.length; i++) {
                radianStart =radianStart+ inputData[i] / total * Math.PI * 2;
                let radian=radianStart-inputData[i] / total * Math.PI * 2/2
                dataNew[i] = {
                    scale: inputData[i] / total,
                    color: colorList[i],
                    radian: radian
                }
            }
            return dataNew
        }
        function draw(){
            context.clearRect(0, 0, 800, 800);
            var data=handleData(inputData)
            var startAngle=0;
            var endAngle=0;
            for(let i=0;i<data.length;i++)
            {
                // 画线
                var edgeX = 250 * Math.cos(data[i].radian);
                var edgeY = 250 * Math.sin(data[i].radian);
                context.beginPath();
                context.moveTo(400, 350);
                context.lineTo(400 + edgeX, 350 + edgeY);
                context.font = '30px Palatino'
                context.strokeStyle=data[i].color
                context.fillStyle=data[i].color
                if(edgeX<0) {
                    context.lineTo(400 + edgeX-50, 350 + edgeY);
                    context.textAlign='end'
                    context.textBaseline='middle'
                    context.fillText(inputText[i],400 +edgeX-50, 350 + edgeY)
                }else {
                    context.lineTo(400 + edgeX+50, 350 + edgeY);
                    context.textAlign='start'
                    context.textBaseline='middle'
                    context.fillText(inputText[i],400 +edgeX+50, 350 + edgeY)
                }
                context.stroke();
                context.closePath();
                // 画圆
                endAngle=startAngle+data[i].scale*Math.PI*2;
                drawCircle(startAngle,endAngle,data[i],i);
                startAngle=endAngle;
                drawInfo(i,inputText[i],colorList[i])
            }
        }
        canvas.addEventListener('mousemove', (e) => {
            e = e || window.event;
            if ( e.ofSfsetX || e.offsetX==0 ) {
                mousePosition.x = e.offsetX;
                mousePosition.y = e.offsetY;
            } else if ( e.layerX || e.layerX==0 ){
                mousePosition.x = e.layerX;
                mousePosition.y = e.layerY;
            } 
            draw();
            // 计算鼠标位置与圆心距离
            const distance = Math.sqrt((e.offsetX - 400) ** 2 + (e.offsetY - 350) ** 2);
            // 判断是否在饼图内部
            isMouseIn = distance < 200;
            if(!isMouseIn) {
                coverDiv.style.display='none'
            }
            // clearTimeout(mouseTimer);
            // mouseTimer = setTimeout(() => {
            //     draw();
            // }, 12)
        });
        //添加说明
        function drawInfo (index,text,color) {
            context.beginPath();
            //画圆角小矩形
            // context.lineJoin="round";
            context.fillRect( spaceX, spaceY*index+ smallH, smallW, smallH);
            //画文字
            context.font = "12px 微软雅黑";
            context.fillStyle = color;
            context.textAlign="left";
            context.textBaseline="bottom";
            context.fillText(text, spaceX*2+ smallW, spaceY*index+ smallH*2);
        }
 
</script>
</html>
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原生js实现饼图_百分比 饼状 原生js

原生js实现饼图_百分比饼状原生js
