环形相似度.vue
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<template>
<div id="sim">
<canvas :id="cid" class="simcav"></canvas>
</div>
</template>
<script>
export default {
props:['cid'],
data(){
return{
}
},
methods:{
drawoutround(){
let c=document.getElementById(this.cid);
debugger
let ctx = c.getContext("2d")
c.width = 300
c.height = 150
ctx.beginPath();
var gradient=ctx.createLinearGradient(0,0,170,0);
gradient.addColorStop("1","rgba(0,0,237,.4)");
gradient.addColorStop("0.3","rgba(33,149,237,.4)");
gradient.addColorStop("0.6","rgba(33,149,237,.8)");
gradient.addColorStop("0","rgba(33,149,237,1)");
// 用渐变进行填充
ctx.strokeStyle=gradient;
ctx.lineWidth=10;
ctx.arc(135,70,40,0,1.8*Math.PI,false)
ctx.lineCap = "round"
ctx.stroke();
ctx.font="18px Verdana";
var gradient=ctx.createLinearGradient(0,0,c.width,0);
gradient.addColorStop("0","magenta");
gradient.addColorStop("0.5","blue");
gradient.addColorStop("1.0","red");
// 用渐变填色
ctx.fillStyle=gradient;
ctx.fillText("80%",115,75);
}
},
mounted(){
this.drawoutround()
}
}
</script>
<style>
.simcav{
height: 150px;
width: 300px;
position: absolute;
left: -80px
}
</style>