项目初始化
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jerry
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<template>
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<view class="tui-circular-container" :style="{ width: diam + 'px', height: (height || diam) + 'px' }">
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<!-- #ifndef MP-ALIPAY -->
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<canvas class="tui-circular-default" :canvas-id="defaultCanvasId" :id="defaultCanvasId"
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:style="{ width: diam + 'px', height: (height || diam) + 'px' }"
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v-if="defaultShow && defaultCanvasId"></canvas>
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<canvas class="tui-circular-progress" :canvas-id="progressCanvasId" :id="progressCanvasId"
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:style="{ width: diam + 'px', height: (height || diam) + 'px' }" v-if="progressCanvasId"></canvas>
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<!-- #endif -->
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<!-- #ifdef MP-ALIPAY -->
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<canvas class="tui-circular-default" :canvas-id="defaultCanvasId" :id="defaultCanvasId"
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:style="{ width: diam*4 + 'px', height: (height || diam)*4 + 'px' }" v-if="defaultShow"></canvas>
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<canvas class="tui-circular-progress" :canvas-id="progressCanvasId" :id="progressCanvasId"
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:style="{ width: diam*4 + 'px', height: (height || diam)*4 + 'px' }"></canvas>
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<!-- #endif -->
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<slot></slot>
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</view>
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</template>
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<script>
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export default {
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name: 'tuiCircularProgress',
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emits: ['change', 'end'],
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props: {
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/*
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传值需使用rpx进行转换保证各终端兼容
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px = rpx / 750 * wx.getSystemInfoSync().windowWidth
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圆形进度条(画布)宽度，直径 [px]
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*/
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diam: {
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type: Number,
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default: 60
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},
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//圆形进度条(画布)高度，默认取diam值[当画半弧时传值，height有值时则取height]
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height: {
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type: Number,
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default: 0
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},
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//进度条线条宽度[px]
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lineWidth: {
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type: Number,
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default: 4
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},
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/*
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线条的端点样式
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butt：向线条的每个末端添加平直的边缘
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round 向线条的每个末端添加圆形线帽
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square 向线条的每个末端添加正方形线帽
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*/
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lineCap: {
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type: String,
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default: 'round'
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},
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//圆环进度字体大小 [px]
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fontSize: {
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type: Number,
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default: 12
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},
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//圆环进度字体颜色
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fontColor: {
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type: String,
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default: ''
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},
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//是否显示进度文字
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fontShow: {
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type: Boolean,
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default: true
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},
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/*
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自定义显示文字[默认为空，显示百分比，fontShow=true时生效]
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可以使用 slot自定义显示内容
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*/
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percentText: {
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type: String,
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default: ''
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},
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//是否显示默认(背景)进度条
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defaultShow: {
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type: Boolean,
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default: true
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},
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//默认进度条颜色
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defaultColor: {
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type: String,
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default: '#CCCCCC'
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},
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//进度条颜色
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progressColor: {
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type: String,
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default: ''
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},
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//进度条渐变颜色[结合progressColor使用，默认为空]
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gradualColor: {
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type: String,
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default: ''
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},
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//起始弧度，单位弧度
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sAngle: {
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type: Number,
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default: -Math.PI / 2
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},
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//指定弧度的方向是逆时针还是顺时针。默认是false，即顺时针
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counterclockwise: {
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type: Boolean,
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default: false
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},
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//进度百分比 [10% 传值 10]
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percentage: {
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type: Number,
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default: 0
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},
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//进度百分比缩放倍数[使用半弧为100%时，则可传2]
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multiple: {
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type: Number,
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default: 1
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},
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//动画执行时间[单位毫秒，低于50无动画]
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duration: {
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type: Number,
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default: 800
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},
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//backwards: 动画从头播；forwards：动画从上次结束点接着播
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activeMode: {
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type: String,
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default: 'backwards'
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}
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},
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watch: {
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percentage(val) {
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this.initDraw();
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}
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},
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data() {
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// #ifndef MP-WEIXIN || MP-QQ
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let cid = `id01_${Math.ceil(Math.random() * 10e5).toString(36)}`
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let did = `id02_${Math.ceil(Math.random() * 10e5).toString(36)}`
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// #endif
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return {
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// #ifdef MP-WEIXIN || MP-QQ
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progressCanvasId: 'progressCanvasId',
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defaultCanvasId: 'defaultCanvasId',
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// #endif
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// #ifndef MP-WEIXIN || MP-QQ
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progressCanvasId: cid,
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defaultCanvasId: did,
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// #endif
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progressContext: null,
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linearGradient: null,
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//起始百分比
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startPercentage: 0
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// dpi
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//pixelRatio: uni.getSystemInfoSync().pixelRatio
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};
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},
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mounted() {
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this.$nextTick(() => {
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setTimeout(() => {
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this.initDraw(true);
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}, 50)
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})
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},
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methods: {
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//初始化绘制
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initDraw(init) {
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let start = this.activeMode === 'backwards' ? 0 : this.startPercentage;
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start = start > this.percentage ? 0 : start;
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if (this.defaultShow && init) {
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this.drawDefaultCircular();
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}
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this.drawProgressCircular(start);
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},
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//默认(背景)圆环
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drawDefaultCircular() {
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let ctx = uni.createCanvasContext(this.defaultCanvasId, this);
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let lineWidth = Number(this.lineWidth)
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// #ifdef MP-ALIPAY
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lineWidth = lineWidth * 4
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// #endif
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ctx.setLineWidth(lineWidth);
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ctx.setStrokeStyle(this.defaultColor);
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//终止弧度
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let eAngle = Math.PI * (this.height ? 1 : 2) + this.sAngle;
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this.drawArc(ctx, eAngle);
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},
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//进度圆环
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drawProgressCircular(startPercentage) {
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let ctx = this.progressContext;
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let gradient = this.linearGradient;
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if (!ctx) {
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ctx = uni.createCanvasContext(this.progressCanvasId, this);
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//创建一个线性的渐变颜色 CanvasGradient对象
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let diam = Number(this.diam)
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// #ifdef MP-ALIPAY
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diam = diam * 4
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// #endif
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const progressColor = this.progressColor || (uni && uni.$tui && uni.$tui.color.primary) || '#5677fc';
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gradient = ctx.createLinearGradient(0, 0, diam, 0);
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gradient.addColorStop('0', progressColor);
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if (this.gradualColor) {
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gradient.addColorStop('1', this.gradualColor);
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}
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// #ifdef APP-PLUS || MP
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const res = uni.getSystemInfoSync();
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if (!this.gradualColor && res.platform.toLocaleLowerCase() == 'android') {
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gradient.addColorStop('1', progressColor);
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}
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// #endif
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this.progressContext = ctx;
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this.linearGradient = gradient;
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}
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let lineWidth = Number(this.lineWidth)
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// #ifdef MP-ALIPAY
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lineWidth = lineWidth * 4
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// #endif
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ctx.setLineWidth(lineWidth);
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ctx.setStrokeStyle(gradient);
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let time = this.percentage == 0 || this.duration < 50 ? 0 : this.duration / this.percentage;
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if (this.percentage > 0) {
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startPercentage = this.duration < 50 ? this.percentage - 1 : startPercentage;
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startPercentage++;
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}
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if (this.fontShow) {
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let fontSize = Number(this.fontSize)
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// #ifdef MP-ALIPAY
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fontSize = fontSize * 4
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// #endif
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ctx.setFontSize(fontSize);
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const fontColor = this.fontColor || (uni && uni.$tui && uni.$tui.color.primary) || '#5677fc';
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ctx.setFillStyle(fontColor);
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ctx.setTextAlign('center');
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ctx.setTextBaseline('middle');
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let percentage = this.percentText;
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if (!percentage) {
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percentage = this.counterclockwise ? 100 - startPercentage * this.multiple : startPercentage * this
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.multiple;
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percentage = `${percentage}%`;
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}
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let radius = this.diam / 2;
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// #ifdef MP-ALIPAY
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radius = radius * 4
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// #endif
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ctx.fillText(percentage, radius, radius);
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}
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if (this.percentage == 0 || (this.counterclockwise && startPercentage == 100)) {
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ctx.draw();
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} else {
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let eAngle = ((2 * Math.PI) / 100) * startPercentage + this.sAngle;
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this.drawArc(ctx, eAngle);
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}
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setTimeout(() => {
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this.startPercentage = startPercentage;
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if (startPercentage >= this.percentage) {
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this.$emit('end', {
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canvasId: this.progressCanvasId,
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percentage: startPercentage
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});
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} else {
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this.drawProgressCircular(startPercentage);
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}
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this.$emit('change', {
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percentage: startPercentage
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});
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}, time);
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// #ifdef H5
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// requestAnimationFrame(()=>{})
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// #endif
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},
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//创建弧线
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drawArc(ctx, eAngle) {
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ctx.setLineCap(this.lineCap);
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ctx.beginPath();
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let radius = this.diam / 2; //x=y
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let lineWidth = Number(this.lineWidth)
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// #ifdef MP-ALIPAY
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radius = radius * 4
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lineWidth = lineWidth * 4
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// #endif
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ctx.arc(radius, radius, radius - lineWidth, this.sAngle, eAngle, this.counterclockwise);
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ctx.stroke();
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ctx.draw();
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}
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}
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};
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</script>
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<style scoped>
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.tui-circular-container,
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.tui-circular-default {
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position: relative;
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}
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/* #ifdef MP-ALIPAY */
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.tui-circular-default,
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.tui-circular-progress {
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zoom: 0.25;
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}
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/* #endif */
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.tui-circular-progress {
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position: absolute !important;
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left: 0;
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top: 0;
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z-index: 10;
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}
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</style>
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