<p>实现uniapp小程序电子横屏签名板代码如下</p><pre class="brush:js;toolbar:false"><template>
<view>
<view>
<view>
<canvas canvas-id="canvas_sign" @touchstart="touchstart"
@touchmove="touchmove" @touchend="touchend" disable-scroll="true"></canvas>
</view>
<view>
<button @click="autographClick(1)">重置</button>
<button @click="autographClick(2)">保存</button>
<button @click="autographClick(3)">取消</button>
</view>
</view>
</view>
</template>
<script>
import {request_url} from "../../utils/url.js"
export default {
data() {
return {
request_url:request_url,canvasCtx: '', //绘图图像
points: [], //路径点集合
hasSign: false,
isInit: false,
}
},
onLoad(query) {
this.canvasCtx = uni.createCanvasContext('canvas_sign', this) //创建绘图对象
//设置画笔样式
this.canvasCtx.lineWidth = 6
// 设置线条的端点样式
this.canvasCtx.lineCap = 'round'
// 设置线条的交点样式
this.canvasCtx.lineJoin = 'round'
},
methods: {
touchstart: function(e) {
if (!this.isInit) {
this.isInit = true
this.autographClick(1);
}
let startX = e.changedTouches[0].x
let startY = e.changedTouches[0].y
let startPoint = {
X: startX,
Y: startY
}
this.points.push(startPoint)
//每次触摸开始，开启新的路径
this.canvasCtx.beginPath()
},touchmove: function(e) {
let moveX = e.changedTouches[0].x
let moveY = e.changedTouches[0].y
let movePoint = {
X: moveX,
Y: moveY
}
this.points.push(movePoint) //存点
let len = this.points.length
if (len >= 2) {
this.draw() //绘制路径
}
},
touchend: function() {
this.points = []
this.canvasCtx.draw(true)
},
draw: function() {
let point1 = this.points[0]
let point2 = this.points[1]
this.points.shift()
this.canvasCtx.moveTo(point1.X, point1.Y)
this.canvasCtx.lineTo(point2.X, point2.Y)
this.canvasCtx.stroke()
this.canvasCtx.draw(true)
this.hasSign = true
},
clear() {
//清空画布
this.hasSign = false
let that=this;
uni.getSystemInfo({
success: function(res) {
let canvas = uni.createSelectorQuery().select('.form-content__canvas')
canvas.boundingClientRect().exec(function(data) {
console.log('canvas', data)
console.log('canvas wh:' + data[0].width + 'X' + data[0].height)
let canvasw = Math.ceil(data[0].width)
let canvash = Math.ceil(data[0].height)
that.canvasCtx.fillStyle = '#fff'
that.canvasCtx.fillRect(0, 0, canvasw, canvash)
that.canvasCtx.draw(true)
})
}
})
},
// 底部按钮点击操作
autographClick(type) {
let that = this
if (type === 1) {
that.clear();
}else if (type === 3) {
uni.navigateBack({
})
} else {
if (!this.hasSign) {
uni.showToast({
title: '签名不能为空',
icon: 'none',
duration: 2000
})
return
}
uni.getSystemInfo({
success: function(res) {
let canvas = uni.createSelectorQuery().select('.form-content__canvas')
canvas.boundingClientRect().exec(function(data) {
console.log('canvas saveSign:', data[0].width + 'X' + data[0].height)
let canvasw = Math.ceil(data[0].width)
let canvash = Math.ceil(data[0].height)
uni.canvasToTempFilePath({
destWidth: canvasw,
destHeight: canvash,
fileType: 'jpg',
canvasId: 'canvas_sign',
success: function(res) {
console.log('图片导出成功：', res)
let path = res.tempFilePath
// 保存图片
if (type === 2) {
that.uploadPic(path)
} else if (type === 3) {
// 预览图片
uni.previewImage({
urls: [path]
})
}
},
fail: (err) => {
// http://tmp/2LVQyvzddk2R820a9009dff43323d8e7fc9ef7a8d076.jpg
console.log('图片导出失败：', err)
}
})
})
}
})
}
},
// 图片上传处理
uploadPic(tempFile) {
let t = this;
uni.showLoading({
title: '正在上传中...'
})
uni.uploadFile({
url:request_url+"uploadImg",
filePath:tempFile,
name:"upfile",
success(res){
let data = JSON.parse(res.data)
t.$store.commit("signature",data.path)
t.clear();
console.log(t.$store.state.signature)
uni.navigateBack({
})
},
fail(e){
console.log(e)
},
complete(){
uni.hideLoading()
}
});
}
}
}
</script>
<style scoped>
/*
* 横屏后的适配方案
* @param $rpx为需要转换的字号
* @参考 https://blog.csdn.net/sdfsfsdscd/article/details/91375066
**/
@function tovmin($rpx) {
@return #{$rpx * 100 / 750}vmin;
}
.page-content {
width: 100vw;
height: 100vh;
.form {
display: flex;
flex-direction: column;
width: 100%;
height: 100%;
.form-content {
width: 100%;
height: 100%;
&__canvas {
height: 100%;
width: 100vw;
}
}
.form-footer {
padding-bottom: tovmin(20);
//height: 100%;
width: 100%;
display: flex;
flex-direction: row;
background: #FFFFFF;
box-shadow: 0 tovmin(4) tovmin(20) tovmin(2) rgba(183, 183, 183, 0.20);
button {
width: 20vw;
height: tovmin(88);
line-height: tovmin(88);
border-radius: tovmin(48);
text-align: center;
font-size: tovmin(36);
font-weight: bold;
}
button::after {
border: none;
}
&__reset {
color: #008AFE;
border: tovmin(1) solid #008AFE;
}
&__save {
background-image: linear-gradient(135deg, #1BC5FF 0%, #008AFE 100%);
}
&__preview {
color: #008AFE;
border: tovmin(1) solid #008AFE;
}
}
}
}
</style></pre><p><span style="color: rgb(31, 31, 31); font-family: monospace; font-size: 12px; white-space: pre-wrap; background-color: rgb(255, 255, 255);">横屏切换</span></p><p><span style="color: rgb(31, 31, 31); font-family: monospace; font-size: 12px; white-space: pre-wrap; background-color: rgb(255, 255, 255);">到【pages.json】文件中添加横屏切换配置</span></p><pre class="brush:js;toolbar:false"> {
"path": "pages/my/sign_page",
"style": {
"navigationBarTitleText": "签名",
"pageOrientation": "landscape",//重点是这里切换横屏
"enablePullDownRefresh": false,
"disableScroll": true
}
}</pre><p><span style="color: rgb(31, 31, 31); font-family: monospace; font-size: 12px; white-space: pre-wrap; background-color: rgb(255, 255, 255);"></span><br/></p>
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