562 lines
13 KiB
Vue
562 lines
13 KiB
Vue
<template>
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<view class="u-signature">
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<view class="u-signature__canvas-wrap">
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<canvas
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class="u-signature__canvas"
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:id="canvasId"
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:canvas-id="canvasId"
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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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:style="{
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width: canvasWidth + 'px',
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height: canvasHeight + 'px',
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background: bgColor
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}"
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></canvas>
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</view>
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<view v-if="showToolbar" class="u-signature__toolbar">
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<view class="u-signature__toolbar-icons u-flex u-flex-x">
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<view class="u-signature__toolbar-icon" @click="undo">
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<up-icon name="arrow-left" size="22" :color="pathStack.length === 0 ? '#ccc' : '#999'"></up-icon>
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</view>
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<view class="u-signature__toolbar-icon" @click="clear">
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<up-icon name="trash" size="25" color="#999"></up-icon>
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</view>
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<view class="u-signature__toolbar-icon" @click="toggleBrushSettings">
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<up-icon name="edit-pen" size="25" color="#999"></up-icon>
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</view>
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<view class="u-signature__toolbar-icon" @click="toggleColorSettings">
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<up-icon name="grid" size="24" color="#999"></up-icon>
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</view>
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<view class="u-signature__toolbar-icon" @click="exportSignature">
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<up-icon name="checkmark" size="25" :color="isEmpty ? '#ccc' : '#999'"></up-icon>
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</view>
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</view>
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<!-- 笔画设置 -->
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<view v-if="showBrushSettings" class="u-signature__brush-settings">
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<view class="u-signature__progress">
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<text class="u-signature__progress-label">{{ t("up.signature.penSize") }}:</text>
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<up-slider
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v-model="lineWidth"
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:min="1"
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:max="20"
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:step="1"
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@show-value="true"
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:value-show="(lineWidth)"
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></up-slider>
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</view>
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</view>
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<!-- 颜色设置 -->
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<view v-if="showColorSettings" class="u-signature__color-settings">
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<view class="u-signature__color-picker">
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<text class="u-signature__color-label">{{ t("up.signature.penColor") }}:</text>
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<view class="u-signature__colors">
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<view
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v-for="(color, index) in presetColors"
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:key="index"
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class="u-signature__color-item"
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:class="{'u-signature__color-item--active': lineColor === color}"
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:style="{ backgroundColor: color }"
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@click="selectColor(color)"
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></view>
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</view>
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</view>
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</view>
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</view>
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</view>
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</template>
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<script>
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import { t } from '../../libs/i18n'
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export default {
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name: 'u-signature',
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props: {
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// 画布宽度
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width: {
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type: [String, Number],
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default: 300
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},
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// 画布高度
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height: {
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type: [String, Number],
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default: 200
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},
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// 背景颜色
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bgColor: {
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type: String,
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default: '#ffffff'
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},
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// 默认笔画颜色
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color: {
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type: String,
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default: '#000000'
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},
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// 默认笔画粗细
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thickness: {
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type: [String, Number],
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default: 3
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},
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// 是否显示工具栏
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showToolbar: {
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type: Boolean,
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default: true
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}
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},
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data() {
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return {
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canvasId: 'u-signature-' + Math.random().toString(36).substr(2, 9),
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canvasWidth: 300,
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canvasHeight: 200,
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lineColor: '#000000',
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lineWidth: 3,
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isDrawing: false,
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pathStack: [], // 存储绘制路径用于回退
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currentPath: [], // 当前绘制路径
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ctx: null,
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isEmpty: true,
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presetColors: [
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'#000000', // 黑色
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'#ff0000', // 红色
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'#00ff00', // 绿色
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'#0000ff', // 蓝色
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'#ffff00', // 黄色
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'#00ffff', // 青色
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'#ff00ff', // 紫色
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'#ffffff' // 白色
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],
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showBrushSettings: false,
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showColorSettings: false,
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lastPoint: null, // 保存上一个点的坐标
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canvasLeft: 0,
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canvasTop: 0
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}
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},
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mounted() {
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this.initCanvas()
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// #ifndef APP-NVUE
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setTimeout(() => { this.updateCanvasOffset() }, 100)
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// #endif
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},
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watch: {
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width: {
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handler(newVal) {
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this.canvasWidth = Number(newVal)
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},
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immediate: true
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},
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height: {
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handler(newVal) {
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this.canvasHeight = Number(newVal)
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},
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immediate: true
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},
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color: {
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handler(newVal) {
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this.lineColor = newVal
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},
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immediate: true
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},
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thickness: {
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handler(newVal) {
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this.lineWidth = Number(newVal)
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},
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immediate: true
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}
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},
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methods: {
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initCanvas() {
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// #ifndef APP-NVUE
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const ctx = uni.createCanvasContext(this.canvasId, this)
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this.ctx = ctx
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this.clearCanvas()
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// #endif
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// #ifdef APP-NVUE
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// NVUE环境下的处理
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// #endif
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},
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touchStart(e) {
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this.updateCanvasOffset()
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if (!this.ctx) return
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this.isDrawing = true
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this.isEmpty = false
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this.currentPath = []
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const { x, y } = this.getCanvasPoint(e)
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this.ctx.beginPath()
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this.ctx.moveTo(x, y)
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this.ctx.setLineCap('round')
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this.ctx.setLineJoin('round')
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this.ctx.setStrokeStyle(this.lineColor)
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this.ctx.setLineWidth(this.lineWidth)
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// 记录起始点
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this.currentPath.push({
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x,
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y,
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type: 'start',
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color: this.lineColor,
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width: this.lineWidth
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})
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// 保存上一个点
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this.lastPoint = { x, y }
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// 阻止默认事件以提高性能
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e.preventDefault()
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},
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touchMove(e) {
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if (!this.isDrawing || !this.ctx) return
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// 阻止默认事件以提高性能
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e.preventDefault()
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const { x, y } = this.getCanvasPoint(e)
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// 使用更密集的点采样确保线条连贯性
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if (this.lastPoint) {
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// 计算两点间距离
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const distance = Math.sqrt(Math.pow(x - this.lastPoint.x, 2) + Math.pow(y - this.lastPoint.y, 2))
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// 根据距离确定插值点数量，确保点间距不超过1像素以获得更平滑的线条
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const steps = Math.max(1, Math.floor(distance / 1))
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// 在两点间插入插值点
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for (let i = 1; i <= steps; i++) {
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const t = i / steps
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const midX = this.lastPoint.x + (x - this.lastPoint.x) * t
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const midY = this.lastPoint.y + (y - this.lastPoint.y) * t
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this.ctx.lineTo(midX, midY)
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this.ctx.stroke()
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this.currentPath.push({
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x: midX,
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y: midY,
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type: 'move'
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})
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}
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} else {
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this.ctx.lineTo(x, y)
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this.ctx.stroke()
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this.currentPath.push({
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x,
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y,
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type: 'move'
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})
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}
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this.ctx.draw(true)
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// 更新上一个点
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this.lastPoint = { x, y }
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},
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touchEnd(e) {
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if (!this.isDrawing || !this.ctx) return
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this.isDrawing = false
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this.ctx.closePath()
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this.lastPoint = null
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// 将当前路径加入栈中用于回退
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if (this.currentPath.length > 0) {
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this.pathStack.push([...this.currentPath])
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}
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this['$emit']('change', this.pathStack)
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},
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// 动态更新 Canvas 在当前视口下的实时位置偏移，用于高精度计算
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updateCanvasOffset() {
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// #ifndef APP-NVUE
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const query = uni.createSelectorQuery()
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query.select('#' + this.canvasId).boundingClientRect(rect => {
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if (rect) {
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this.canvasLeft = rect.left
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this.canvasTop = rect.top
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}
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}).exec()
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// #endif
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},
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// 同步获取canvas坐标点（兼容处理）
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getCanvasPoint(e) {
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// 🌟 1. 100% 微信真机秘籍：优先读取原生 mpEvent 内的 changedTouches，它保存了触发本次笔迹移动的那个最精确的触点
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const mpTouch = e.mp && e.mp.changedTouches && e.mp.changedTouches[0] ? e.mp.changedTouches[0] : null
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const uniTouch = (e.changedTouches && e.changedTouches[0]) || (e.touches && e.touches[0])
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const touch = mpTouch || uniTouch
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if (!touch) return { x: 0, y: 0 }
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// 🌟 2. 直取微信原生和 Uni-App 规范下的相对坐标 x/y（直接就是基于 Canvas 左上角，无需任何复杂 selector 视口偏移计算，永无偏差）
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if (touch.x !== undefined && touch.y !== undefined && !isNaN(touch.x) && !isNaN(touch.y)) {
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return {
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x: touch.x,
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y: touch.y
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}
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}
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// 🌟 3. 万一由于 Vue3 层层嵌套导致 touch 丢失了相对坐标，我们再启用绝对定位 fallback 偏移作为高精度备用防护
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let x = touch.clientX - this.canvasLeft
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let y = touch.clientY - this.canvasTop
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if (isNaN(x) || x === undefined) x = 0
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if (isNaN(y) || y === undefined) y = 0
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return {
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x: Math.max(0, x),
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y: Math.max(0, y)
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}
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},
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getCanvasPointUnused(e) {
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const touch = e.touches[0] || e.changedTouches[0]
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if (!touch) return { x: 0, y: 0 }
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// 1. 优先使用原生组件的相对坐标
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if (touch.x !== undefined && touch.y !== undefined && !isNaN(touch.x) && !isNaN(touch.y)) {
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return {
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x: touch.x,
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y: touch.y
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}
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}
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// 2. 针对 iOS 苹果微信小程序（没有 x/y）采用视口绝对坐标减去容器视口偏移量计算
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let x = touch.clientX - this.canvasLeft
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let y = touch.clientY - this.canvasTop
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// 3. 严格数据降级保护，绝不容许 NaN 等非法数值污染画布路径，彻底封死放射状黑墨水
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if (isNaN(x) || x === undefined) x = 0
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if (isNaN(y) || y === undefined) y = 0
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return {
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x: Math.max(0, x),
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y: Math.max(0, y)
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}
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},
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getCanvasPointOld(e) {
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const touch = e.touches[0]
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// 移除了高频调用的无用 SelectorQuery 以防止内存泄漏和线程卡顿
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// 返回一个包含坐标的对象
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return {
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x: touch.x,
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y: touch.y
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}
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},
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// 选择颜色
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selectColor(color) {
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this.lineColor = color
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},
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// 回退操作
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undo() {
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if (this.pathStack.length === 0) return
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// 弹出最后一个路径
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this.pathStack.pop()
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// 重新绘制
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this.redraw()
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this['$emit']('change', this.pathStack)
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},
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// 重新绘制所有路径
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redraw() {
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this.clearCanvas()
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if (this.pathStack.length === 0) {
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this.isEmpty = true
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return
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}
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this.isEmpty = false
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// #ifndef APP-NVUE
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this.pathStack.forEach(path => {
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if (path.length === 0) return
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this.ctx.beginPath()
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this.ctx.setLineCap('round')
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this.ctx.setLineJoin('round')
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let lastPoint = null
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path.forEach((point, index) => {
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if (index === 0 && point.type === 'start') {
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// 设置起始点样式
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this.ctx.setStrokeStyle(point.color)
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this.ctx.setLineWidth(point.width)
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this.ctx.moveTo(point.x, point.y)
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lastPoint = { x: point.x, y: point.y }
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} else if (point.type === 'move') {
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this.ctx.lineTo(point.x, point.y)
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lastPoint = { x: point.x, y: point.y }
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}
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})
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this.ctx.stroke()
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this.ctx.draw(true)
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})
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// #endif
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},
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// 清空画布
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clear() {
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this.pathStack = []
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this.currentPath = []
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this.isEmpty = true
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this.lastPoint = null
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this.clearCanvas()
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this['$emit']('change', this.pathStack)
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},
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// 清空画布内容
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clearCanvas() {
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if (!this.ctx) return
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// #ifndef APP-NVUE
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this.ctx.setFillStyle(this.bgColor)
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this.ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight)
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this.ctx.draw()
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// #endif
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},
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// 导出签名图片
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exportSignature() {
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if (this.isEmpty) return
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// #ifndef APP-NVUE
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uni.canvasToTempFilePath({
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canvasId: this.canvasId,
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fileType: 'png',
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quality: 1,
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success: (res) => {
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this.$emit('confirm', res.tempFilePath)
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},
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fail: (err) => {
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this.$emit('error', err)
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}
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}, this)
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// #endif
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// #ifdef APP-NVUE
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// NVUE环境下可能需要特殊处理
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// #endif
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},
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// 切换笔画设置显示
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toggleBrushSettings() {
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this.showBrushSettings = !this.showBrushSettings;
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if (this.showBrushSettings) {
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this.showColorSettings = false;
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}
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},
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// 切换颜色设置显示
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toggleColorSettings() {
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this.showColorSettings = !this.showColorSettings;
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if (this.showColorSettings) {
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this.showBrushSettings = false;
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}
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},
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}
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}
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</script>
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<style lang="scss" scoped>
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.u-signature {
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display: flex;
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flex-direction: column;
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&__canvas-wrap {
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border: 1px solid #e0e0e0;
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border-radius: 4px;
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overflow: hidden;
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}
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&__canvas {
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width: 100%;
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height: 100%;
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}
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&__toolbar {
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margin-top: 5px;
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background-color: #fff;
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}
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&__toolbar-icons {
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display: flex;
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justify-content: space-between;
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align-items: center;
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padding: 1px 0;
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// border: 1px solid #e0e0e0;
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border-radius: 4px;
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}
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&__toolbar-icon {
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padding: 5px;
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}
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&__brush-settings,
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&__color-settings {
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margin-top: 15px;
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padding: 1px;
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// border: 1px solid #e0e0e0;
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border-radius: 4px;
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}
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&__progress {
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&-label {
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display: block;
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margin-bottom: 10px;
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font-size: 14px;
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color: #999;
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}
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}
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&__color-picker {
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margin-bottom: 10px;
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}
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&__color-label {
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display: block;
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margin-bottom: 10px;
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font-size: 14px;
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color: #999;
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}
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&__colors {
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display: flex;
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flex-direction: row;
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flex-wrap: wrap;
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gap: 10px;
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}
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&__color-item {
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width: 30px;
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height: 30px;
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border-radius: 50%;
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border: 2px solid #f0f0f0;
|
||
cursor: pointer;
|
||
|
||
&--active {
|
||
border-color: #2979ff;
|
||
transform: scale(1.1);
|
||
}
|
||
}
|
||
|
||
&__actions {
|
||
display: flex;
|
||
flex-direction: row;
|
||
gap: 10px;
|
||
justify-content: center;
|
||
}
|
||
}
|
||
</style> |