实现样式
<template>
<view class="main-content" v-if="isShow">
<!-- 签字canvas -->
<block v-if="showCanvas">
<canvas
class="mycanvas"
id="mycanvas"
canvas-id="mycanvas"
@touchstart="touchstart"
@touchmove="touchmove"
@touchend="touchend"
disable-scroll="true"
></canvas>
<!-- 旋转canvas -->
</block>
<block class="" v-else>
<image :src="imgurl" mode="" class="sign-img"></image>
</block>
<canvas
class="rotatCanvas"
id="rotatCanvas"
:style="{ 'z-index': -1, width: `${screenWidth}px`, height: `${(screenWidth * screenWidth) / screenHeight}px` }"
canvas-id="rotatCanvas"
></canvas>
<view class="button-line">
<view class="save-button" @tap.stop="finish">保存</view>
<view class="clear-button" @tap.stop="clear">清除</view>
<view class="cancel-button" @tap.stop="hide">关闭</view>
</view>
<view class="kw-modal flex align-items-center justify-content-center" v-if="showModal" @tap.stop>
<view class="kw-modal-content">
<view class="flex justify-content-end font-size-34 lightgray">
<text class="iconfont icon-guanbi" @tap="close"></text>
</view>
<view class="flex justify-content-center font-size-38 font-600 kw-modal-title">
{
{title}}
</view>
<view class="kw-modal-btnbox flex justify-content-between">
<view @tap="cancel" class="kw-modal-btn">{
{cancelText}}</view>
<view @tap="confirm" class="kw-modal-btn">{
{confirmText}}</view>
</view>
</view>
</view>
<view class="sign-toast flex align-items-center justify-content-center" v-if="showToast">
<view class="toast-box">请先签名</view>
</view>
</view>
</template>其中下方kw-modal是签名确认的弹窗，sign-toast是签名内容是否是空的判断弹窗，在app端canvas层级问题不存在就不需要对canvas进行显示与隐藏的控制了，sign-img就不需要了
<script>
export default {
data() {
return {
ctx: '', //绘图图像
points: [], //路径点集合
screenWidth: '',
screenHeight: '',
isRotatShow:false,
showModal:false,
showToast:false,
startX:'',
startY:'',
moveX:'',
moveY:'',
imgurl:'',
showCanvas:true,
title:'提示框',
cancelText:'取消',
confirmText:'确认',
};
},
props:{
isShow:{
type:Boolean,
default:true
}
},
mounted() {
this.createCanvas();
uni.getSystemInfo({
success: e => {
this.screenWidth = e.screenWidth;
this.screenHeight = e.screenHeight - 110;
console.log(e,'e')
}
});
},
methods: {
show() {
this.clear();
this.isShow = true;
},
hide() {
this.$emit('close',false)
this.showCanvas = true
},
close(){
this.showCanvas = true
this.showModal = false
},
cancel(){
this.close()
},
confirm(){
this.rotat(this.imgurl);
},
save(){
this.showCanvas = false
console.log(this.moveX,'moveX')
console.log(this.moveY,'moveY')
if(!this.moveX&&!this.moveY){
this.showToast = true
setTimeout(()=>{
this.showToast = false
this.showCanvas = true
},1500)
return false
}
this.showModal = true
this.title = '确认签字？一旦确认，不能修改'
},
//创建并显示画布
createCanvas() {
this.showCanvas = true;
this.ctx = uni.createCanvasContext('mycanvas', this); //创建绘图对象
//设置画笔样式
this.ctx.lineWidth = 2;
this.ctx.lineCap = 'round';
this.ctx.lineJoin = 'round';
},
//触摸开始，获取到起点
touchstart(e) {
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.ctx.beginPath();
},
//触摸移动，获取到路径点
touchmove(e) {
this.moveX = e.changedTouches[0].x;
this.moveX = e.changedTouches[0].y;
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
}
},
// 触摸结束，将未绘制的点清空防止对后续路径产生干扰
touchend() {
this.points = [];
},
draw() {
let point1 = this.points[0];
let point2 = this.points[1];
this.points.shift();
this.ctx.moveTo(point1.X, point1.Y);
this.ctx.lineTo(point2.X, point2.Y);
this.ctx.stroke();
this.ctx.draw(true);
},
//清空画布
clear() {
this.ctx.clearRect(0, 0, this.screenWidth, this.screenHeight);
this.ctx.draw(true);
this.moveX = '';
this.moveY = '';
this.showCanvas = true
},
//完成绘画并保存到本地
finish() {
uni.canvasToTempFilePath(
{
canvasId: 'mycanvas',
success: res => {
this.imgurl = res.tempFilePath
this.save()
},
complete: com => {}
},
this
);
},
// 将图片选装
rotat(e) {
// this.isRotatShow = true
// this.showCanvas = true
let rotatCtx = uni.createCanvasContext('rotatCanvas', this); //创建绘图对象
// 重新定位中心点
rotatCtx.translate(0, (this.screenWidth * this.screenWidth) / this.screenHeight);
// rotatCtx.translate(0, 0);
// 将画布逆时针旋转90度
rotatCtx.rotate((270 * Math.PI) / 180);
// 将签字图片绘制进入Canvas
rotatCtx.drawImage(e, 0, 0, (this.screenWidth * this.screenWidth) / this.screenHeight, this.screenWidth);
// 保存后旋转后的结果
rotatCtx.draw(true);
setTimeout(() => {
// 生成图片并回调
uni.canvasToTempFilePath(
{
canvasId: 'rotatCanvas',
success: val => {
console.log('tempFilePath', val.tempFilePath)
this.showCanvas = false
this.$emit('savesign', val.tempFilePath);
setTimeout(() => {
this.hide();
}, 500);
},
complete: com => {
// console.log(com);
}
},
this
);
}, 500);
}
}
};
</script>
css
<style lang="scss" scoped>
.main-content {
width: 100vw;
height: 100vh;
background-color: #ffffff;
z-index: 9999;
overflow: hidden;
max-height:100vh;
}
.mycanvas {
width: 100vw;
height: calc(100vh - 110px);
background-color: #efefef;
position: fixed;
left: 0rpx;
top: 0rpx;
z-index: 2;
}
.sign-img{
width: 100vw;
height: calc(100vh - 110px);
}
.rotatCanvas{
background-color: red;
}
.button-line {
transform: rotate(90deg);
position: fixed;
bottom: -250rpx;
left: 260rpx;
align-items: center;
justify-content: space-between;
z-index: 999;
}
.button-style {
color: #ffffff;
width: 100px;
height: 120rpx;
text-align: center;
line-height: 120rpx;
border-radius: 10rpx;
margin-bottom: 40rpx;
font-size: 34rpx
}
.save-button {
@extend .button-style;
background-color: #02b340;
height: 240rpx;
line-height: 240rpx;
}
.clear-button {
@extend .button-style;
background-color: #ffa500;
height: 240rpx;
line-height: 240rpx;
}
.cancel-button {
@extend .button-style;
background-color: #e10b2b;
}
.kw-modal,.sign-toast{
width: 100vw;
height: calc(100vh - 110px);
transform: rotate(90deg);
position: absolute;
top: 0;
left: 0;
z-index: 999;
}
.kw-modal-content{
width: 690rpx;
// height: 400rpx;
background: #efefef;
border-radius: 30rpx;
padding: 38rpx 30rpx 70rpx;
.kw-modal-title{
margin-top: 22rpx;
}
.kw-modal-tips{
margin-top: 20rpx;
}
.kw-modal-inp{
margin-top: 50rpx;
.kw-inp{
border: 1rpx solid #D9D9D9;
border-radius: 4rpx;
height: 70rpx;
line-height: 70rpx;
padding: 0 30rpx;
}
.inp-title{
margin-right: 20rpx;
}
}
.kw-modal-btnbox{
margin-top: 100rpx;
.kw-modal-btn{
width: 300rpx;
height: 84rpx;
background: #D9D9D9;
border-radius: 60rpx;
line-height: 84rpx;
text-align: center;
font-size: 30rpx;
&:last-child{
color: #FFFFFF;
background: #59A3FF;
}
}
}
}
.toast-box{
padding: 15rpx 30rpx;
background-color: rgba(0, 0, 0, .7);
color: #fff;
border-radius: 8rpx;
font-size: 30rpx;
}
</style>
弹窗效果如图
