125 lines
2.7 KiB
Vue
125 lines
2.7 KiB
Vue
<template>
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<view>
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<!-- 定义canvas画布 // 设置canvas大小为200x200像素 -->
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<canvas @touchstart="handleCanvasTouch" canvas-id="canvas" id="canvas"
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style="border: 1px solid red;height: 600px;width: 100vw;"></canvas>
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<!-- 添加一个按钮，用于触发绘图 -->
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<button @click="handleDraw">点击绘制圆形</button>
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</view>
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</template>
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<script setup>
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import {
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ref,
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onMounted,
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getCurrentInstance
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} from 'vue'
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const canvasWidth = ref(375) // 动态设置Canvas宽度
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const canvasHeight = ref(400) // 动态设置Canvas高度
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const instance = getCurrentInstance()
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// 定义绘图函数
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const blocks = ref([{
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x: 50,
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y: 50,
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width: 100,
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height: 100,
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color: 'red',
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message: '点击了红色方块'
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},
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{
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x: 200,
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y: 50,
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width: 100,
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height: 100,
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color: 'blue',
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message: '点击了蓝色方块'
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},
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{
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x: 50,
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y: 200,
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width: 100,
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height: 100,
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color: 'green',
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message: '点击了绿色方块'
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},
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{
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x: 200,
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y: 200,
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width: 100,
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height: 100,
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color: 'yellow',
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message: '点击了黄色方块'
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},
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{
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x: 350,
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y: 50,
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width: 100,
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height: 100,
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color: 'purple',
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message: '点击了紫色方块'
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},
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])
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async function draw() {
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const imgUrl = "https://assets.sx25.troyrc.com/sx25/images/events/XBDT.jpg"
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const ctx = uni.createCanvasContext('canvas', instance) // 创建canvas绘图上下文
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const res = await uni.getImageInfo({
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src: imgUrl,
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})
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console.log(res, 'res');
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ctx.drawImage(res.path, 0, 0, canvasWidth.value, canvasHeight.value);
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// 定义5个方块的颜色和位置
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// 绘制每个方块
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blocks.value.forEach((block) => {
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ctx.beginPath();
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ctx.fillStyle = block.color;
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ctx.rect(block.x, block.y, block.width, block.height);
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ctx.fill();
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});
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ctx.draw()
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}
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// 处理canvas触摸事件
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function handleCanvasTouch(event) {
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// 获取触摸点的坐标
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const x = event.touches[0].x;
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const y = event.touches[0].y;
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// 定义5个方块的颜色和位置
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// 判断点击位置
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blocks.value.forEach((block) => {
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if (x >= block.x && x <= block.x + block.width && y >= block.y && y <= block.y + block.height) {
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uni.showModal({
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title: '提示',
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content: block.message,
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showCancel: true, // 显示取消按钮
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success: (res) => {
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if (res.confirm) {
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console.log('用户点击了“确定”按钮');
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} else if (res.cancel) {
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console.log('用户点击了“取消”按钮');
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}
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},
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});
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}
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});
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}
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// 按钮点击事件处理函数
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const handleDraw = () => {
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draw(); // 调用绘图函数
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}
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onMounted(() => {
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draw()
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// 确保在组件挂载后可以获取到Canvas元素
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})
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</script>
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<style scoped>
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button {
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margin-top: 10px;
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}
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</style> |