2022-02-24 11:44:27
0
主代码页,示例代码:
- /*Index.hml*/
- <stack class="container-stack">
- <text class="txt">点击出现水波</text>
- <canvas ref="ref_canvas" class="canvas" @touchstart='touchstartfunc' on:click="handleClick"/>
- </stack>
- </div>
- Index.css
- .container {
- flex-direction: column;
- justify-content: center;
- align-items: center;
- height: 100%;
- /* background-color: #5e7c85;*/
- }
- .div-titlebar {
- position: absolute;
- top: 52px;
- }
- .container-stack {
- align-items: center;
- }
- .canvas {
- width: 340px;
- height: 120px;
- border: 1px solid #111;
- justify-content: center;
- align-items: center;
- align-content: center;
- margin-left: 10px;
- margin-right: 10px;
- border-radius: 8px;
- }
- .txt {
- align-items: center;
- width: 100%;
- height: 40px;
- font-size: 30px;
- text-align: center;
- color: #111;
- }
- [url=home.php?mod=space&uid=205723]@MEDIA[/url] screen and (device-type: phone) and (orientation: landscape) {
- .canvas {
- width: 700px;
- }
- }
- /*index.hml*/
- import device from '@system.device';
- var ctx;
- var mDownX;
- var mDownY;
- const DRAW_RADIUS_ZERO = 0;
- const DRAW_RADIUS_MOVE = 50;
- const DURATION = 400;
- const FREQUENCY = 10;
- var mCycle;
- /*绘制的半径*/
- var mDrawRadius;
- /*绘制的最大半径*/
- var mMaxRadius = 0;
- var mStepRadius = 0;
- var timer = null;
- var viewWidth = 340;
- var viewHeight = 118;
- export default {
- data: {
- },
- onInit() {
- mCycle = DURATION / FREQUENCY;
- mCycle = 3.0 * mCycle;
- },
- onShow() {
- console.log("luzhen onShow");
- device.getInfo({
- success: function(data) {
- if (data.windowWidth < data.windowHeight) {
- viewWidth = 338;
- } else {
- viewWidth = 694;
- }
- },
- fail: function(data, code) {
- console.log('Failed to obtain device information. Error code:'+ code + '; Error information: ' + data);
- },
- });
- this.clipPath();
- },
- clipPath() {
- const el = this.$refs.ref_canvas;
- ctx = el.getContext('2d', {
- antialias: true
- });
- let radius = 8;
- ctx.beginPath();
- ctx.lineWidth = 0;
- ctx.strokeStyle = '#FFFFFF';
- ctx.moveTo(0, radius);
- ctx.bezierCurveTo(0, radius, 0, 0, radius, 0);
- ctx.lineTo(viewWidth - radius, 0);
- ctx.bezierCurveTo(viewWidth - radius, 0, viewWidth, 0, viewWidth, radius);
- ctx.lineTo(viewWidth, viewHeight - radius);
- ctx.bezierCurveTo(viewWidth, viewHeight - radius, viewWidth, viewHeight, viewWidth - radius, viewHeight);
- ctx.lineTo(radius, viewHeight);
- ctx.bezierCurveTo(radius, viewHeight, 0, viewHeight, 0, viewHeight - radius);
- ctx.closePath();
- ctx.clip();
- ctx.stroke();
- },
- touchstartfunc(msg) {
- mDownX = msg.touches[0].localX;
- mDownY = msg.touches[0].localY;
- this.updateDrawData();
- mStepRadius = 5 * mStepRadius;
- if (timer != null) {
- clearInterval(timer);
- timer = null;
- }
- timer = setInterval(this.run, 50);
- },
- updateDrawData() {
- this.setDrawRadius(DRAW_RADIUS_ZERO);
- /*计算最大半径*/
- let radiusLeftTop = Math.sqrt((mDownX - 10) * (mDownX - 10) + mDownY * mDownY);
- let radiusRightTop = Math.sqrt((viewWidth - (mDownX - 10)) *
- (viewWidth - (mDownX - 10)) +
- mDownY * mDownY);
- let radiusLeftBottom = Math.sqrt((mDownX - 10) * (mDownX - 10) +
- (viewHeight - mDownY) * (viewHeight - mDownY));
- let radiusRightBottom = Math.sqrt((viewWidth - (mDownX - 10)) * (viewWidth - (mDownX - 10)) +
- (viewHeight - mDownY) * (viewHeight - mDownY));
- let radiusArr = [radiusLeftTop, radiusRightTop, radiusLeftBottom, radiusRightBottom];
- let i = 0;
- for (; i < radiusArr.length; i++) {
- mMaxRadius = Math.max(mMaxRadius, radiusArr[i]);
- }
- mStepRadius = mMaxRadius / mCycle;
- },
- setDrawRadius(radius) {
- mDrawRadius = radius;
- },
- run() {
- mDrawRadius = mDrawRadius + mStepRadius;
- ctx.clearRect(0, 0, viewWidth, 120);
- ctx.beginPath();
- ctx.strokeStyle = '#58FAAC';
- ctx.fillStyle = '#58FAAC';
- ctx.globalAlpha = 0.7;
- if (mDrawRadius > mMaxRadius) {
- clearInterval(timer);
- timer = null;
- this.setDrawRadius(DRAW_RADIUS_ZERO);
- ctx.arc((mDownX - 10), mDownY, mMaxRadius, 0, 6.28);
- return;
- }
- ctx.arc((mDownX - 10), mDownY, mDrawRadius, 0, 6.28);
- ctx.stroke();
- ctx.fill();
- }
- }
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