template-project/components/ar-circle-progress/index.vue

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<template>
<view
class="circle-progress"
:style="{
width: widthPx + 'px',
height: widthPx + 'px',
backgroundColor: bgColor
}"
>
<!-- 有的不支持canvas-id属性必须用id属性 -->
<canvas v-if="canvasId"
class="canvas-bg"
:canvas-id="canvasId"
:id="canvasId"
:style="{
width: widthPx + 'px',
height: widthPx + 'px'
}"
></canvas>
<canvas v-if="elId"
class="canvas"
:canvas-id="elId"
:id="elId"
:style="{
width: widthPx + 'px',
height: widthPx + 'px'
}"
></canvas>
<slot></slot>
</view>
</template>
<script>
export default {
name: 'circle-progress',
props: {
// 圆环进度百分比值
percent: {
type: Number,
default: 0,
// 值在0到100之间
validator: val => {
return val >= 0 && val <= 100;
}
},
// 圆环底色(灰色的圆环)
inactiveColor: {
type: String,
default: '#ececec'
},
// 圆环激活部分的颜色
activeColor: {
type: String,
default: '#009dff'
},
// 圆环线条的宽度单位rpx
borderWidth: {
type: [Number, String],
default: 14
},
// 整个圆形的宽度单位rpx
width: {
type: [Number, String],
default: 200
},
// 整个圆环执行一圈的时间单位ms
duration: {
type: [Number, String],
default: 1500
},
// 圆环进度区域的背景色
bgColor: {
type: String,
default: '#ffffff'
}
},
data() {
return {
canvasId: this.randomId(), //一个页面多个圆形进度
elId: this.randomId(),
widthPx: uni.upx2px(this.width), // 转成px后的整个组件的背景宽度
borderWidthPx: uni.upx2px(this.borderWidth), // 转成px后的圆环的宽度
startAngle: -Math.PI / 2, // canvas画圆的起始角度默认为3点钟方向定位到12点钟方向
progressContext: null, // 活动圆的canvas上下文
newPercent: 0, // 当动态修改进度值的时候,保存进度值的变化前后值,用于比较用
oldPercent: 0 // 当动态修改进度值的时候,保存进度值的变化前后值,用于比较用
};
},
watch: {
percent(nVal, oVal = 0) {
if (nVal > 100) nVal = 100;
if (nVal < 0) oVal = 0;
this.newPercent = nVal;
this.oldPercent = oVal;
setTimeout(() => {
this.drawCircleByProgress(oVal);
}, 50);
}
},
created() {
// 赋值,用于加载后第一个画圆使用
this.newPercent = this.percent;
this.oldPercent = 0;
},
mounted() {
this.drawProgressBg();
this.drawCircleByProgress(this.oldPercent);
},
methods: {
//一个页面多个progress时ID需不同
randomId(){
return 'progressId'+parseInt(Math.random()*1000000)
},
drawProgressBg() {
let ctx = uni.createCanvasContext(this.canvasId, this);
ctx.setLineWidth(this.borderWidthPx); // 设置圆环宽度
ctx.setStrokeStyle(this.inactiveColor); // 线条颜色
ctx.beginPath(); // 开始描绘路径
let radius = this.widthPx / 2;
ctx.arc(radius, radius, radius - this.borderWidthPx, 0, 2 * Math.PI, false);
ctx.stroke(); // 对路径进行描绘
ctx.draw();
},
drawCircleByProgress(progress) {
let ctx = this.progressContext;
if (!ctx) {
ctx = uni.createCanvasContext(this.elId, this);
this.progressContext = ctx;
}
// 表示进度的两端为圆形
ctx.setLineCap('round');
// 设置线条的宽度和颜色
ctx.setLineWidth(this.borderWidthPx);
ctx.setStrokeStyle(this.activeColor);
// 计算过渡时间
let time = Math.floor(this.duration / 200);
let endAngle = ((2 * Math.PI) / 100) * progress + this.startAngle;
ctx.beginPath();
// 半径为整个canvas宽度的一半
let radius = this.widthPx / 2;
ctx.arc(radius, radius, radius - this.borderWidthPx, this.startAngle, endAngle, false);
ctx.stroke();
ctx.draw();
// 增大了百分比
if (this.newPercent > this.oldPercent) {
progress++;
if (progress > this.newPercent) return;
} else {
// 减少百分比
progress--;
if (progress < this.newPercent) return;
}
setTimeout(() => {
// 定时器,为了让进度条有动画效果
this.drawCircleByProgress(progress);
}, time);
}
}
};
</script>
<style scoped>
.circle-progress {
position: relative;
display: flex;
align-items: center;
justify-content: center;
}
.canvas-bg {
position: absolute;
}
.canvas {
position: absolute;
}
</style>