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266
src/pages/index/components/ggl/scraping.vue
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266
src/pages/index/components/ggl/scraping.vue
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<template>
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<view class="scraping-happy" id="container">
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<canvas
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canvas-id="scraping-happy"
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class="scraping__canvas"
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:disable-scroll="true"
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@touchstart="touchstart"
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@touchmove="touchmove"
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@touchend="touchend"
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/>
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<cover-view class="scraping__view">
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{{ showText }}
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</cover-view>
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</view>
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</template>
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<script>
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/** @name 水印配置默认值 **/
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const WATERMARK = {
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text: '刮一刮',
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fontSize: 14,
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color: '#C5C5C5',
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}
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/** @name 标题配置默认值 **/
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const TITLE = {
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text: '刮一刮',
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fontSize: 16,
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color: '#333',
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}
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/**
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* @name 涂层配置默认值
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* @property { string } color 涂层颜色
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* @property { number } drawSize 清除涂层的画笔大小
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*/
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const MASK = {
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color: '#DDDDDD',
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drawSize: 20,
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}
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/** @name 容错值，解决部分机型涂层没有覆盖满的情况，主要原因是由于像素尺寸不同导致的，应尽可能让width与height保持整数 **/
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const TOLERANT = 3;
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let ctx = null;
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export default {
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props: {
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/** @name 涂层设置 **/
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mask: {
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type: [String, Object],
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},
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/** @name 水印设置 **/
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watermark: {
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type: [String, Object],
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},
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/** @name 提示文字 **/
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title: {
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type: [String, Object],
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},
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/** @name 刮开百分之多少直接消除图层，为0的时候不消除 **/
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percentage: {
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type: Number,
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default: 60,
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},
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result: {
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type: String,
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default: ''
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}
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},
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data() {
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return {
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width: 0,
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height: 0,
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touchX: 0,
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touchY: 0,
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showText: ''
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}
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},
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computed: {
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maskSetting() {
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return {
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...MASK,
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...(typeof this.mask === 'object' ? this.mask : { text: this.mask }),
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}
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},
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watermarkSetting() {
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return {
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...WATERMARK,
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...(typeof this.watermark === 'object' ? this.watermark : { text: this.watermark }),
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};
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},
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titleSetting() {
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return {
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...TITLE,
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...(typeof this.title === 'object' ? this.title : { text: this.title }),
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};
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}
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},
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mounted() {
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// 获取画布实例
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ctx = uni.createCanvasContext('scraping-happy', this);
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this.init();
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},
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methods: {
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/** @name 初始化 **/
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init() {
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const query = uni.createSelectorQuery().in(this);
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query
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.select('#container')
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.boundingClientRect(({ width, height }) => {
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this.width = width;
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this.height = height;
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setTimeout(() => {
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this.initCanvas();
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this.showText = this.result
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}, 20)
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})
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.exec();
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},
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/** @name 初始化canvas状态 **/
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initCanvas() {
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const { width, height } = this;
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// 清空矩形内容
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ctx.clearRect(0, 0, width, height);
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// 设置画笔颜色
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ctx.setFillStyle(this.maskSetting.color);
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// 绘制矩形
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ctx.fillRect(0, 0, width, height + TOLERANT);
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// 绘制水印
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this.drawWatermark();
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// 绘制提示文字
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this.drawTitle();
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// 绘制到canvas身上
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ctx.draw();
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},
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/** @name 绘制水印 **/
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drawWatermark() {
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if (!this.watermarkSetting.text) return;
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// 保存当前的绘图上下文
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ctx.save();
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// 旋转
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ctx.rotate((-10 * Math.PI) / 180);
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// 水印具体绘制过程
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const { width, height } = this;
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const watermarkWidth = this.watermarkSetting.text.length * this.watermarkSetting.fontSize;
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let x = 0;
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let y = 0;
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let i = 0;
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while ((x <= width * 5 || y <= height * 5) && i < 300) {
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ctx.setFillStyle(this.watermarkSetting.color);
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ctx.setFontSize(this.watermarkSetting.fontSize);
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ctx.fillText(this.watermarkSetting.text, x, y);
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x += watermarkWidth + watermarkWidth * 1.6;
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if (x > width && y <= height) {
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x = -Math.random() * 100;
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y += this.watermarkSetting.fontSize * 3;
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}
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i++;
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}
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ctx.restore();
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},
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/** @name 绘制提示文字 **/
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drawTitle() {
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if (!this.titleSetting.text) return;
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ctx.setTextAlign('center');
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ctx.setTextBaseline('middle');
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ctx.setFillStyle(this.titleSetting.color);
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ctx.setFontSize(this.titleSetting.fontSize);
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ctx.fillText(this.titleSetting.text, this.width / 2, this.height / 3);
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},
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/** @name 触摸事件 **/
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touchstart(e) {
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this.touchX = e.touches[0].x;
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this.touchY = e.touches[0].y;
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},
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async touchmove(e) {
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// 把画笔到画布中的指定点
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ctx.moveTo(this.touchX, this.touchY);
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// 清除涂层
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ctx.clearRect(this.touchX, this.touchY, this.maskSetting.drawSize, this.maskSetting.drawSize);
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ctx.draw(true);
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// 记录移动点位
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this.touchX = e.touches[0].x;
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this.touchY = e.touches[0].y;
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// if (this.percentage > 0) {
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// const clearPercent = await this.getClearMaskPercent();
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// }
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},
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async touchend() {
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if (this.percentage > 0) {
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const clearPercent = await this.getClearMaskPercent();
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if (clearPercent >= this.percentage) {
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ctx.moveTo(0, 0);
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ctx.clearRect(0, 0, this.width, this.height);
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ctx.stroke();
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ctx.draw(true);
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}
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}
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},
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/** @name 计算被清除的涂层百分比 **/
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getClearMaskPercent() {
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return new Promise(resolve => {
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uni.canvasGetImageData({
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canvasId: 'scraping-happy',
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x: 0,
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y: 0,
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width: this.width,
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height: this.height,
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success: res => {
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// 区域内所有点的像素信息，它是一个数组，数组中每 "4" 项表示一个点的 rgba 值
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const allPointPixels = res.data;
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// 储存被清除的点-点的透明度
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const clearPoint = [];
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// 取透明度来判断，如果透明度值小于一半，则判断为该点已经被清除
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for (let i = 0; i < allPointPixels.length; i += 4) {
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if (allPointPixels[i + 3] < 128) {
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clearPoint.push(allPointPixels[i + 3]);
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}
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}
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// 已被清除的百分比 = 清除的点 / 全部的点
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const percent = (
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(clearPoint.length / (allPointPixels.length / 4)) *
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100
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).toFixed(2);
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resolve(percent);
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},
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fail: e => {
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console.log('canvasGetImageData', e);
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},
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}, this);
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});
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},
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/** @name 重置 **/
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reset() {
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this.initCanvas();
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this.touchX = 0;
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this.touchY = 0;
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}
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}
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};
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</script>
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<style>
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.scraping-happy {
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width: 100%;
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height: 200rpx;
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position: relative;
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display: flex;
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justify-content: center;
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align-items: center;
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}
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.scraping__canvas {
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width: 100%;
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height: 100%;
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position: absolute;
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z-index: 10;
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/* background-color: red; */
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display: inline-block;
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}
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.scraping__view {
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position: absolute;
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z-index: 1;
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color: #f29100;
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font-size: 20px;
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font-weight: bold;
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}
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</style>
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