|
|
<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">笔画大小:</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">笔画颜色:</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>
|
|
|
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])
|
|
|
}
|
|
|
},
|
|
|
|
|
|
// 获取相对于canvas的坐标点
|
|
|
getCanvasPoint(e) {
|
|
|
const touch = e.touches[0]
|
|
|
const rect = uni.createSelectorQuery().in(this).select('.u-signature__canvas').boundingClientRect()
|
|
|
|
|
|
return new Promise((resolve) => {
|
|
|
rect.boundingClientRect(data => {
|
|
|
const x = touch.x - data.left
|
|
|
const y = touch.y - data.top
|
|
|
resolve({ x, y })
|
|
|
}).exec()
|
|
|
})
|
|
|
},
|
|
|
|
|
|
// 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> |