vue 使用canvas画类似的百分比球形

<template>
    <div>
        <canvas id="myCanvas" :width="width" :height="height"></canvas>
    </div>
</template>

<script>
export default {
    data () {
        return {
            ele: null  
        }
    },
    props: {
         {
            type: String,
            default: '200'
        },
        height: {
            type: String,
            default: '200'
        },
        src: {
            type: String,
            default: require('./dashback.png')
        },
        percent: {
            type: String,
            default: 75
        },
        pad {
            default: 0.75           
        },
        border {
            default: 20           
        },       
             
    },
    methods: {
        PI (deg)
        {
            return (deg/100)*2*Math.PI;
        },
        draw () {
            let can = document.getElementById("myCanvas")
            let cxt = can.getContext("2d")
            cxt.clearRect(0,0,this.width,this.height)
            let img = new Image()
            img.src = this.src
            img.onload = () => {
                cxt.drawImage(img,0,0,this.width,this.height);

                /* 文字 */
                cxt.fillStyle="#ffffff";
                cxt.font = "47px Arial"
                cxt.fillText(this.percent,(parseInt(this.width)-70)/2,(parseInt(this.height)+29)/2)

                cxt.font = "18px Arial"
                cxt.fillText("分",(parseInt(this.width)+36)/2,(parseInt(this.height)+29)/2)

                cxt.beginPath();
                cxt.arc(parseInt(this.width)/2, parseInt(this.height)/2, this.padwidth*this.width/2, this.PI(100), this.PI(0), true)
                cxt.lineWidth = this.borderwidth*0.6;
                cxt.strokeStyle = 'rgba(255,255,255,.35)';
                cxt.shadowOffsetX = 0
                cxt.shadowOffsetY = 0
                cxt.shadowColor = 'rgb(100,100,100)'
                cxt.shadowBlur = 10
                cxt.stroke();      

                cxt.beginPath();
                cxt.arc(parseInt(this.width)/2, parseInt(this.height)/2, this.padwidth*this.width/2, this.PI(this.percent), this.PI(0), true);
                cxt.lineWidth = this.borderwidth;
                cxt.strokeStyle = 'white';
                cxt.shadowOffsetX = 0
                cxt.shadowOffsetY = 0
                cxt.shadowColor = 'rgb(100,100,100)'
                cxt.shadowBlur = 10
                cxt.stroke();  
            }            
        }        
    },
    mounted: function () {          
        this.draw()        
    },
    created: function () {

    },
    watch: {
        'percent': function(newVal){
            this.draw()
        }
    }
}
</script>

使用

<dash-board percent="45"></dash-board>  

效果

原图