<template>
<view class="container">
<view class="sign-box">
<canvas class="mycanvas"
:style="{width:width +'px',height:height +'px'}"
canvas-id="mycanvas"
@touchstart="touchstart"
@touchmove="touchmove"
@touchend="touchend"></canvas>
<canvas canvas-id="camCacnvs"
:style="{width:height +'px',height:width +'px'}"
class="canvsborder"></canvas>
</view>
<view class="sign-btns">
<button class="btn"
@tap="handleCancel">返回</button>
<button class="btn"
@tap="handleReset">重写</button>
<button class="btn"
@tap="handleConfirm">完成</button>
</view>
</view>
</template>
<script>
var x = 20;
var y = 20;
var tempPoint = []; //用来存放当前画纸上的轨迹点
let that;
export default {
data() {
return {
ctx: '', //绘图图像
points: [], //路径点集合,
width: 0,
height: 0
};
},
mounted() {
},
onLoad(option) {
that = this;
this.ctx = uni.createCanvasContext('mycanvas', this); //创建绘图对象
//设置画笔样式
this.ctx.lineWidth = 4;
this.ctx.lineCap = 'round';
this.ctx.lineJoin = 'round';
uni.getSystemInfo({
success: function (res) {
console.log(58,res);
that.width = res.windowWidth;
that.height = res.windowHeight * 0.9;
}
});
},
methods: {
//触摸开始,获取到起点
touchstart: function (e) {
let startX = e.changedTouches[0].x;
let startY = e.changedTouches[0].y;
let startPoint = {
X: startX,
Y: startY
};
/* **************************************************
#由于uni对canvas的实现有所不同,这里需要把起点存起来
* **************************************************/
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: 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
}
tempPoint.push(movePoint);
},
// 触摸结束,将未绘制的点清空防止对后续路径产生干扰
touchend: function () {
this.points = [];
},
/* ***********************************************
# 绘制笔迹
# 1.为保证笔迹实时显示,必须在移动的同时绘制笔迹
# 2.为保证笔迹连续,每次从路径集合中区两个点作为起点(moveTo)和终点(lineTo)
# 3.将上一次的终点作为下一次绘制的起点(即清除第一个点)
************************************************ */
draw: function () {
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);
},
handleCancel() {
uni.navigateBack({
delta: 1
});
},
//清空画布
handleReset: function () {
console.log('handleReset');
that.ctx.clearRect(0, 0, that.width, that.height);
that.ctx.draw(true);
tempPoint = [];
},
//将签名笔迹上传到服务器,并将返回来的地址存到本地
handleConfirm: function () {
if (tempPoint.length == 0) {
uni.showToast({
title: '请先签名',
icon: 'none',
duration: 2000
});
return;
}
uni.canvasToTempFilePath({
canvasId: 'mycanvas',
success: function (res) {
let tempPath = res.tempFilePath;
console.log(149,res)
const ctx = uni.createCanvasContext('camCacnvs', that);
ctx.translate(0, that.width);
ctx.rotate((-90 * Math.PI) / 180);
ctx.drawImage(tempPath, 0, 0, that.width, that.height);
ctx.draw();
setTimeout(() => {
uni.uploadFile({
/* // 拿到临时图片路径后上传到服务器,服务器将返回一个公网地址,
届时在任意角落都将能访问到这张图片 */
filePath: tempPath, //临时文件路径
url: 'https://xxxxxxxxxxx.com/api/upload/uploadImage', //填写公司的服务器地址
name: 'file', /* //非常重要!!!!是后台访问二进制数据的关键
该 file 是对应接口,所需要传递的参数 */
timeout:5000,
success(res2){
console.log(res2);
}
})
}, 200);
}
});
}
}
};
</script>
<style lang="scss" scoped>
.container {
display: flex;
flex-direction: column;
.sign-box {
width: 100%;
.mycanvas {
width: 100%;
margin: 0rpx;
background-color: #ececec;
}
.canvsborder {
border: 1rpx solid #333;
position: fixed;
top: 0;
left: 10000rpx;
}
}
.sign-btns {
display: flex;
flex-direction: row;
.btn {
box-sizing: border-box;
font-size: 28rpx;
padding: 5rpx;
transform: rotate(90deg);
border-radius: 10rpx;
}
.btn {
}
}
}
</style>
小程序手写签名功能
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转载自blog.csdn.net/weixin_44949068/article/details/129144123
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