485 lines
10 KiB
Vue
485 lines
10 KiB
Vue
<template>
|
||
<view class="u-signature">
|
||
<view class="u-signature__canvas-wrap">
|
||
<canvas
|
||
class="u-signature__canvas"
|
||
:canvas-id="canvasId"
|
||
:disable-scroll="true"
|
||
@touchstart="touchStart"
|
||
@touchmove="touchMove"
|
||
@touchend="touchEnd"
|
||
:style="{
|
||
width: canvasWidth + 'px',
|
||
height: canvasHeight + 'px',
|
||
background: bgColor
|
||
}"
|
||
></canvas>
|
||
</view>
|
||
|
||
<view v-if="showToolbar" class="u-signature__toolbar">
|
||
<view class="u-signature__toolbar-icons u-flex u-flex-x">
|
||
<view class="u-signature__toolbar-icon" @click="undo">
|
||
<up-icon name="arrow-left" size="22" :color="pathStack.length === 0 ? '#ccc' : '#999'"></up-icon>
|
||
</view>
|
||
<view class="u-signature__toolbar-icon" @click="clear">
|
||
<up-icon name="trash" size="25" color="#999"></up-icon>
|
||
</view>
|
||
<view class="u-signature__toolbar-icon" @click="toggleBrushSettings">
|
||
<up-icon name="edit-pen" size="25" color="#999"></up-icon>
|
||
</view>
|
||
<view class="u-signature__toolbar-icon" @click="toggleColorSettings">
|
||
<up-icon name="grid" size="24" color="#999"></up-icon>
|
||
</view>
|
||
<view class="u-signature__toolbar-icon" @click="exportSignature">
|
||
<up-icon name="checkmark" size="25" :color="isEmpty ? '#ccc' : '#999'"></up-icon>
|
||
</view>
|
||
</view>
|
||
|
||
<!-- 笔画设置 -->
|
||
<view v-if="showBrushSettings" class="u-signature__brush-settings">
|
||
<view class="u-signature__progress">
|
||
<text class="u-signature__progress-label">{{ t("up.signature.penSize") }}:</text>
|
||
<up-slider
|
||
v-model="lineWidth"
|
||
:min="1"
|
||
:max="20"
|
||
:step="1"
|
||
@show-value="true"
|
||
:value-show="(lineWidth)"
|
||
></up-slider>
|
||
</view>
|
||
</view>
|
||
|
||
<!-- 颜色设置 -->
|
||
<view v-if="showColorSettings" class="u-signature__color-settings">
|
||
<view class="u-signature__color-picker">
|
||
<text class="u-signature__color-label">{{ t("up.signature.penColor") }}:</text>
|
||
<view class="u-signature__colors">
|
||
<view
|
||
v-for="(color, index) in presetColors"
|
||
:key="index"
|
||
class="u-signature__color-item"
|
||
:class="{'u-signature__color-item--active': lineColor === color}"
|
||
:style="{ backgroundColor: color }"
|
||
@click="selectColor(color)"
|
||
></view>
|
||
</view>
|
||
</view>
|
||
</view>
|
||
</view>
|
||
</view>
|
||
</template>
|
||
|
||
<script>
|
||
import { t } from '../../libs/i18n'
|
||
export default {
|
||
name: 'u-signature',
|
||
props: {
|
||
// 画布宽度
|
||
width: {
|
||
type: [String, Number],
|
||
default: 300
|
||
},
|
||
// 画布高度
|
||
height: {
|
||
type: [String, Number],
|
||
default: 200
|
||
},
|
||
// 背景颜色
|
||
bgColor: {
|
||
type: String,
|
||
default: '#ffffff'
|
||
},
|
||
// 默认笔画颜色
|
||
color: {
|
||
type: String,
|
||
default: '#000000'
|
||
},
|
||
// 默认笔画粗细
|
||
thickness: {
|
||
type: [String, Number],
|
||
default: 3
|
||
},
|
||
// 是否显示工具栏
|
||
showToolbar: {
|
||
type: Boolean,
|
||
default: true
|
||
}
|
||
},
|
||
data() {
|
||
return {
|
||
canvasId: 'u-signature-' + Math.random().toString(36).substr(2, 9),
|
||
canvasWidth: 300,
|
||
canvasHeight: 200,
|
||
lineColor: '#000000',
|
||
lineWidth: 3,
|
||
isDrawing: false,
|
||
pathStack: [], // 存储绘制路径用于回退
|
||
currentPath: [], // 当前绘制路径
|
||
ctx: null,
|
||
isEmpty: true,
|
||
presetColors: [
|
||
'#000000', // 黑色
|
||
'#ff0000', // 红色
|
||
'#00ff00', // 绿色
|
||
'#0000ff', // 蓝色
|
||
'#ffff00', // 黄色
|
||
'#00ffff', // 青色
|
||
'#ff00ff', // 紫色
|
||
'#ffffff' // 白色
|
||
],
|
||
showBrushSettings: false,
|
||
showColorSettings: false,
|
||
lastPoint: null // 保存上一个点的坐标
|
||
}
|
||
},
|
||
mounted() {
|
||
this.initCanvas()
|
||
},
|
||
watch: {
|
||
width: {
|
||
handler(newVal) {
|
||
this.canvasWidth = Number(newVal)
|
||
},
|
||
immediate: true
|
||
},
|
||
height: {
|
||
handler(newVal) {
|
||
this.canvasHeight = Number(newVal)
|
||
},
|
||
immediate: true
|
||
},
|
||
color: {
|
||
handler(newVal) {
|
||
this.lineColor = newVal
|
||
},
|
||
immediate: true
|
||
},
|
||
thickness: {
|
||
handler(newVal) {
|
||
this.lineWidth = Number(newVal)
|
||
},
|
||
immediate: true
|
||
}
|
||
},
|
||
methods: {
|
||
initCanvas() {
|
||
// #ifndef APP-NVUE
|
||
const ctx = uni.createCanvasContext(this.canvasId, this)
|
||
this.ctx = ctx
|
||
this.clearCanvas()
|
||
// #endif
|
||
|
||
// #ifdef APP-NVUE
|
||
// NVUE环境下的处理
|
||
// #endif
|
||
},
|
||
|
||
touchStart(e) {
|
||
if (!this.ctx) return
|
||
|
||
this.isDrawing = true
|
||
this.isEmpty = false
|
||
this.currentPath = []
|
||
|
||
const { x, y } = this.getCanvasPoint(e)
|
||
this.ctx.beginPath()
|
||
this.ctx.moveTo(x, y)
|
||
this.ctx.setLineCap('round')
|
||
this.ctx.setLineJoin('round')
|
||
this.ctx.setStrokeStyle(this.lineColor)
|
||
this.ctx.setLineWidth(this.lineWidth)
|
||
|
||
// 记录起始点
|
||
this.currentPath.push({
|
||
x,
|
||
y,
|
||
type: 'start',
|
||
color: this.lineColor,
|
||
width: this.lineWidth
|
||
})
|
||
|
||
// 保存上一个点
|
||
this.lastPoint = { x, y }
|
||
|
||
// 阻止默认事件以提高性能
|
||
e.preventDefault()
|
||
},
|
||
|
||
touchMove(e) {
|
||
if (!this.isDrawing || !this.ctx) return
|
||
|
||
// 阻止默认事件以提高性能
|
||
e.preventDefault()
|
||
|
||
const { x, y } = this.getCanvasPoint(e)
|
||
|
||
// 使用更密集的点采样确保线条连贯性
|
||
if (this.lastPoint) {
|
||
// 计算两点间距离
|
||
const distance = Math.sqrt(Math.pow(x - this.lastPoint.x, 2) + Math.pow(y - this.lastPoint.y, 2))
|
||
// 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
|
||
const steps = Math.max(1, Math.floor(distance / 1))
|
||
|
||
// 在两点间插入插值点
|
||
for (let i = 1; i <= steps; i++) {
|
||
const t = i / steps
|
||
const midX = this.lastPoint.x + (x - this.lastPoint.x) * t
|
||
const midY = this.lastPoint.y + (y - this.lastPoint.y) * t
|
||
|
||
this.ctx.lineTo(midX, midY)
|
||
this.ctx.stroke()
|
||
this.currentPath.push({
|
||
x: midX,
|
||
y: midY,
|
||
type: 'move'
|
||
})
|
||
}
|
||
} else {
|
||
this.ctx.lineTo(x, y)
|
||
this.ctx.stroke()
|
||
this.currentPath.push({
|
||
x,
|
||
y,
|
||
type: 'move'
|
||
})
|
||
}
|
||
|
||
this.ctx.draw(true)
|
||
|
||
// 更新上一个点
|
||
this.lastPoint = { x, y }
|
||
},
|
||
|
||
touchEnd(e) {
|
||
if (!this.isDrawing || !this.ctx) return
|
||
|
||
this.isDrawing = false
|
||
this.ctx.closePath()
|
||
this.lastPoint = null
|
||
|
||
// 将当前路径加入栈中用于回退
|
||
if (this.currentPath.length > 0) {
|
||
this.pathStack.push([...this.currentPath])
|
||
}
|
||
},
|
||
|
||
// 同步获取canvas坐标点（兼容处理）
|
||
getCanvasPoint(e) {
|
||
const touch = e.touches[0]
|
||
const canvas = uni.createSelectorQuery().in(this).select('.u-signature__canvas')
|
||
|
||
// 返回一个包含坐标的对象
|
||
return {
|
||
x: touch.x,
|
||
y: touch.y
|
||
}
|
||
},
|
||
|
||
// 选择颜色
|
||
selectColor(color) {
|
||
this.lineColor = color
|
||
},
|
||
|
||
// 回退操作
|
||
undo() {
|
||
if (this.pathStack.length === 0) return
|
||
|
||
// 弹出最后一个路径
|
||
this.pathStack.pop()
|
||
|
||
// 重新绘制
|
||
this.redraw()
|
||
},
|
||
|
||
// 重新绘制所有路径
|
||
redraw() {
|
||
this.clearCanvas()
|
||
|
||
if (this.pathStack.length === 0) {
|
||
this.isEmpty = true
|
||
return
|
||
}
|
||
|
||
this.isEmpty = false
|
||
|
||
// #ifndef APP-NVUE
|
||
this.pathStack.forEach(path => {
|
||
if (path.length === 0) return
|
||
|
||
this.ctx.beginPath()
|
||
this.ctx.setLineCap('round')
|
||
this.ctx.setLineJoin('round')
|
||
|
||
let lastPoint = null
|
||
path.forEach((point, index) => {
|
||
if (index === 0 && point.type === 'start') {
|
||
// 设置起始点样式
|
||
this.ctx.setStrokeStyle(point.color)
|
||
this.ctx.setLineWidth(point.width)
|
||
this.ctx.moveTo(point.x, point.y)
|
||
lastPoint = { x: point.x, y: point.y }
|
||
} else if (point.type === 'move') {
|
||
this.ctx.lineTo(point.x, point.y)
|
||
lastPoint = { x: point.x, y: point.y }
|
||
}
|
||
})
|
||
|
||
this.ctx.stroke()
|
||
this.ctx.draw(true)
|
||
})
|
||
// #endif
|
||
},
|
||
|
||
// 清空画布
|
||
clear() {
|
||
this.pathStack = []
|
||
this.currentPath = []
|
||
this.isEmpty = true
|
||
this.lastPoint = null
|
||
this.clearCanvas()
|
||
},
|
||
|
||
// 清空画布内容
|
||
clearCanvas() {
|
||
if (!this.ctx) return
|
||
|
||
// #ifndef APP-NVUE
|
||
this.ctx.setFillStyle(this.bgColor)
|
||
this.ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight)
|
||
this.ctx.draw()
|
||
// #endif
|
||
},
|
||
|
||
// 导出签名图片
|
||
exportSignature() {
|
||
if (this.isEmpty) return
|
||
|
||
// #ifndef APP-NVUE
|
||
uni.canvasToTempFilePath({
|
||
canvasId: this.canvasId,
|
||
fileType: 'png',
|
||
quality: 1,
|
||
success: (res) => {
|
||
this.$emit('confirm', res.tempFilePath)
|
||
},
|
||
fail: (err) => {
|
||
this.$emit('error', err)
|
||
}
|
||
}, this)
|
||
// #endif
|
||
|
||
// #ifdef APP-NVUE
|
||
// NVUE环境下可能需要特殊处理
|
||
// #endif
|
||
},
|
||
|
||
// 切换笔画设置显示
|
||
toggleBrushSettings() {
|
||
this.showBrushSettings = !this.showBrushSettings;
|
||
if (this.showBrushSettings) {
|
||
this.showColorSettings = false;
|
||
}
|
||
},
|
||
|
||
// 切换颜色设置显示
|
||
toggleColorSettings() {
|
||
this.showColorSettings = !this.showColorSettings;
|
||
if (this.showColorSettings) {
|
||
this.showBrushSettings = false;
|
||
}
|
||
},
|
||
}
|
||
}
|
||
</script>
|
||
|
||
<style lang="scss" scoped>
|
||
.u-signature {
|
||
display: flex;
|
||
flex-direction: column;
|
||
|
||
&__canvas-wrap {
|
||
border: 1px solid #e0e0e0;
|
||
border-radius: 4px;
|
||
overflow: hidden;
|
||
}
|
||
|
||
&__canvas {
|
||
width: 100%;
|
||
height: 100%;
|
||
}
|
||
|
||
&__toolbar {
|
||
margin-top: 5px;
|
||
background-color: #fff;
|
||
}
|
||
|
||
&__toolbar-icons {
|
||
display: flex;
|
||
justify-content: space-between;
|
||
align-items: center;
|
||
padding: 1px 0;
|
||
// border: 1px solid #e0e0e0;
|
||
border-radius: 4px;
|
||
}
|
||
|
||
&__toolbar-icon {
|
||
padding: 5px;
|
||
}
|
||
|
||
&__brush-settings,
|
||
&__color-settings {
|
||
margin-top: 15px;
|
||
padding: 1px;
|
||
// border: 1px solid #e0e0e0;
|
||
border-radius: 4px;
|
||
}
|
||
|
||
&__progress {
|
||
&-label {
|
||
display: block;
|
||
margin-bottom: 10px;
|
||
font-size: 14px;
|
||
color: #999;
|
||
}
|
||
}
|
||
|
||
&__color-picker {
|
||
margin-bottom: 10px;
|
||
}
|
||
|
||
&__color-label {
|
||
display: block;
|
||
margin-bottom: 10px;
|
||
font-size: 14px;
|
||
color: #999;
|
||
}
|
||
|
||
&__colors {
|
||
display: flex;
|
||
flex-direction: row;
|
||
flex-wrap: wrap;
|
||
gap: 10px;
|
||
}
|
||
|
||
&__color-item {
|
||
width: 30px;
|
||
height: 30px;
|
||
border-radius: 50%;
|
||
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> |