vue+canvas实现移动端手写签名
程序员文章站
2022-04-09 15:58:35
本文实例为大家分享了vue+canvas实现移动端手写签名的具体代码，供大家参考，具体内容如下
本文实例为大家分享了vue+canvas实现移动端手写签名的具体代码，供大家参考，具体内容如下
<template>
<div class="sign">
<div class="header">
<i class="el-icon-arrow-left backimg" @click="goback"></i>
<span class="title">个人签名</span>
</div>
<section class="signature">
<div class="signaturebox">
<div class="canvasbox" ref="canvashw">
<canvas ref="canvasf" class="canvasstyle" @touchstart='touchstart' @touchmove='touchmove' @touchend='touchend' @mousedown="mousedown" @mousemove="mousemove" @mouseup="mouseup"></canvas>
</div>
</div>
</section>
<div class="btnbox">
<div @click="overwrite" class="btn1">重置</div>
<div @click="commit" class="btn1">确定</div>
</div>
<div class="imglist-box" :style="imgurllist.length>0 ? 'border: 1px solid #d9d9d9;' : ''">
<img v-for="i in imgurllist" class="imgcanvas" :src="i">
<img v-show="imgurllist.length>0" src="../../assets/img/signdelete.png" class="resign" @click="deleteall">
</div>
<div class="tijiao-box">
<button @click="commitall" class="tijiao">提 交</button>
</div>
</div>
</template>
<script>
import { bus } from '@/utils'
export default {
name:'personsign',
data() {
return {
stageinfo:'',
imgurl:'',
imgurllist:[],
client: {},
points: [],
canvastxt: null,
startx: 0,
starty: 0,
movey: 0,
movex: 0,
endy: 0,
endx: 0,
w: null,
h: null,
isdown: false,
isviewautograph: this.$route.query.isviews > 0,
contractsuccess: this.$route.query.contractsuccess,
}
},
mounted() {
let canvas = this.$refs.canvasf
canvas.height = this.$refs.canvashw.offsetheight -0
canvas.width = this.$refs.canvashw.offsetwidth - 0
this.canvastxt = canvas.getcontext('2d')
this.canvastxt.linewidth = 4
this.stageinfo = canvas.getboundingclientrect()
},
methods: {
goback(){
this.$router.go(-1)
// session.clear()
},
//mobile
touchstart(ev) {
ev = ev || event
ev.preventdefault()
if (ev.touches.length == 1) {
let obj = {
x: ev.targettouches[0].clienx,
y: ev.targettouches[0].clienty,
}
this.startx = obj.x
this.starty = obj.y
this.canvastxt.beginpath()
this.canvastxt.moveto(this.startx, this.starty)
this.canvastxt.lineto(obj.x, obj.y)
this.canvastxt.stroke()
this.canvastxt.closepath()
this.points.push(obj)
}
},
touchmove(ev) {
ev = ev || event
ev.preventdefault()
if (ev.touches.length == 1) {
let obj = {
x: ev.targettouches[0].clientx - this.stageinfo.left,
y: ev.targettouches[0].clienty - this.stageinfo.top
}
this.movey = obj.y
this.movex = obj.x
this.canvastxt.beginpath()
this.canvastxt.moveto(this.startx, this.starty)
this.canvastxt.lineto(obj.x, obj.y)
this.canvastxt.stroke()
this.canvastxt.closepath()
this.starty = obj.y
this.startx = obj.x
this.points.push(obj)
}
},
touchend(ev) {
ev = ev || event
ev.preventdefault()
if (ev.touches.length == 1) {
let obj = {
x: ev.targettouches[0].clientx - this.stageinfo.left,
y: ev.targettouches[0].clienty - this.stageinfo.top
}
this.canvastxt.beginpath()
this.canvastxt.moveto(this.startx, this.starty)
this.canvastxt.lineto(obj.x, obj.y)
this.canvastxt.stroke()
this.canvastxt.closepath()
this.points.push(obj)
}
},
//pc
mousedown(ev) {
ev = ev || event
ev.preventdefault()
if (1) {
let obj = {
x: ev.offsetx,
y: ev.offsety
}
this.startx = obj.x
this.starty = obj.y
this.canvastxt.beginpath()
this.canvastxt.moveto(this.startx, this.starty)
this.canvastxt.lineto(obj.x, obj.y)
this.canvastxt.stroke()
// this.canvastxt.strokerect(20,20,80,100);
this.canvastxt.closepath()
this.points.push(obj)
this.isdown = true
}
},
mousemove(ev) {
ev = ev || event
ev.preventdefault()
if (this.isdown) {
let obj = {
x: ev.offsetx,
y: ev.offsety
}
this.movey = obj.y
this.movex = obj.x
this.canvastxt.beginpath()
this.canvastxt.moveto(this.startx, this.starty)
this.canvastxt.lineto(obj.x, obj.y)
this.canvastxt.stroke()
this.canvastxt.closepath()
this.starty = obj.y
this.startx = obj.x
this.points.push(obj)
}
},
mouseup(ev) {
ev = ev || event
ev.preventdefault()
if (1) {
let obj = {
x: ev.offsetx,
y: ev.offsety
}
this.canvastxt.beginpath()
this.canvastxt.moveto(this.startx, this.starty)
this.canvastxt.lineto(obj.x, obj.y)
this.canvastxt.stroke()
this.canvastxt.closepath()
this.points.push(obj)
this.points.push({x: -1, y: -1})
this.isdown = false
}
},
//重写
overwrite() {
this.canvastxt.clearrect(0, 0, this.$refs.canvasf.width, this.$refs.canvasf.height)
this.points = []
},
//确定签名
commit() {
this.imgurl=this.$refs.canvasf.todataurl();
this.imgurllist.push(this.imgurl)
if(this.imgurllist.length>0){
this.canvastxt.clearrect(0, 0, this.$refs.canvasf.width, this.$refs.canvasf.height)
this.points = []
}
},
deleteall(){
this.imgurllist = []
},
// 提交签名给前一页
commitall(){
// 用canvas合并多张图片的base64为一张图的base64
var canvas = document.createelement("canvas");
canvas.width = 75*this.imgurllist.length;
canvas.height = 100;
var context = canvas.getcontext("2d");
context.rect(0 , 0 , canvas.width , canvas.height);
context.fillstyle = "#fff";
context.fill();
var myimage = new image();
myimage.crossorigin = 'anonymous';
// 当签名列表有值时
if(this.imgurllist.length>0){
for(let i = 0;i<this.imgurllist.length;i++){
myimage.src = this.imgurllist[i]
// 多张图片绘制成一张图片
context.drawimage(myimage , 50*i , 0 , 75 , 75); //context.drawimage(img,x,y,width,height);
// context.font = "60px courier new";
// context.filltext("我是文字",350,450);
}
var base64 = canvas.todataurl("image/jpg"); //"image/jpg" 这里注意一下
this.$router.go(-1) //要在bus之前写不然值传不回去
settimeout(() => {
bus.$emit('signimage',base64) //签名base64传给前一页
}, 300)
}
}
},
beforedestroy(){
// 销毁bus
bus.$off()
}
}
</script>
<style scoped lang="scss">
// 签名样式很重要，会影响触点位置
.sign{
width: 100%;
min-height: 100vh;
position: relative;
.header{
margin-bottom: 20px;
}
.tijiao-box{
width: 100%;
text-align: center;
}
.tijiao{
width: 90%;
height: 84px;
color: #fff;
border-radius: 2px;
background: #fa4b31;
box-shadow: 0 0 0px 1px #fa4b31;
font-size: 30px;
}
}
.signature{
width: 100%;
height: 50vh;
}
.imglist-box{
width: 90%;
margin: 0 auto;
margin-bottom: 20px;
position: relative;
}
.imgcanvas{
width: 150px;
height: 150px;
}
.resign{
width: 14%;
position: absolute;
top: 0;
right: 0;
}
.signaturebox {
width: 90%;
margin: 0 auto;
height: calc(100% - 50px);
box-sizing: border-box;
overflow: hidden;
background: #fff;
z-index: 100;
display: flex;
flex-direction: column;
align-items: center;
}
.canvasbox {
width: 100%;
align-items: center;
box-sizing: border-box;
flex: 1;
}
canvas {
background-image: url('../../assets/img/signbg.png');
background-position: center center;
background-repeat: no-repeat;
background-origin: border-box;
background-size: 100% 100%;
}
.btnbox{
width: 90%;
margin: 0 auto;
display: flex;
justify-content: space-between;
margin-bottom: 20px;
.btn1{
width: 46%;
height: 84px;
line-height: 84px;
color: #fa4b31;
border-radius: 2px;
background: #fff;
border: 1px solid #fa4b31;
box-shadow: 0 0 0px 1px #fa4b31;
font-size: 30px;
text-align: center;
}
}
.btnbox button:first-of-type {
background: transparent;
border-radius: 4px;
height: 40px;
width: 80px;
font-size: 14px;
}
.btnbox button:last-of-type {
background: #71b900;
color: #fff;
border-radius: 4px;
height: 40px;
width: 80px;
font-size: 14px;
}
</style>
重置就是清除田字格当前字，确定就将字保存为一张图片base64排列在列表。
重签就是删除列表所有图片，提交就是将多张图合并为一张且传给前一页显示。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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