246 lines
5.7 KiB
Vue
246 lines
5.7 KiB
Vue
<template>
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<view class="sign">
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<head-view title="绘制质损图"></head-view>
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<view class="containe contentFixedr">
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<view class="sign-box">
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<canvas class="mycanvas" canvas-id="mycanvas" @touchstart="touchstart" @touchmove="touchmove"
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@touchend="touchend" disable-scroll="true"></canvas>
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<view class="canvasBg">
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<image src="../../static/images/zs2.png" mode=""></image>
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</view>
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</view>
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<view class="sigh-btns">
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<van-button class="btn" type="default" @tap="handleCancel">取消</van-button>
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<van-button class="btn" type="default" @tap="handleReset">重写</van-button>
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<van-button class="btn" type="default" @tap="handleConfirm">确认</van-button>
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</view>
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</view>
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</view>
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</template>
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<script>
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import {
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pathToBase64,
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base64ToPath
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} from '../../js_sdk/mmmm-image-tools/index.js'
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import utils from '@/common/util.js';
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var x = 20;
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var y = 20;
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var tempPoint = []; //用来存放当前画纸上的轨迹点
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var id = 0;
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var type = '';
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let that;
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export default {
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data() {
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return {
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ctx: '', //绘图图像
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points: [], //路径点集合,
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width: 0,
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height: 0,
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loginObj: {},
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signImg: "",
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url: "",
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};
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},
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onLoad(option) {
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that = this;
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id = option.id;
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type = option.type;
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this.init()
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this.loginObj = uni.getStorageSync('loginObj')
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},
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methods: {
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init() {
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this.ctx = uni.createCanvasContext('mycanvas', this); //创建绘图对象
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//设置画笔样式
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this.ctx.lineWidth = 4;
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this.ctx.lineCap = 'round';
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this.ctx.lineJoin = 'round';
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var that = this
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uni.getImageInfo({
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src: '../../static/images/zs2.png',
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success(res1) {
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//填充白色背景图片
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that.ctx.drawImage('../../static/images/zs2.png', 0, 0, 624, 224);
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let pattern = that.ctx.createPattern(img, 'no-repeat')
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that.ctx.fillStyle = pattern;
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},
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fail() {
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console.log("fail");
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}
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});
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},
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//触摸开始，获取到起点
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touchstart: function(e) {
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let startX = e.changedTouches[0].x;
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let startY = e.changedTouches[0].y;
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let startPoint = {
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X: startX / 1.75,
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Y: startY / 1.75
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};
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/* **************************************************
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#由于uni对canvas的实现有所不同，这里需要把起点存起来
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* **************************************************/
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this.points.push(startPoint);
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//每次触摸开始，开启新的路径
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this.ctx.beginPath();
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},
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//触摸移动，获取到路径点
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touchmove: function(e) {
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let moveX = e.changedTouches[0].x;
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let moveY = e.changedTouches[0].y;
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let movePoint = {
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X: moveX / 1.75,
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Y: moveY / 1.75
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};
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this.points.push(movePoint); //存点
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let len = this.points.length;
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if (len >= 2) {
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this.draw(); //绘制路径
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}
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tempPoint.push(movePoint);
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},
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// 触摸结束，将未绘制的点清空防止对后续路径产生干扰
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touchend: function() {
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this.points = [];
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},
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/* ***********************************************
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# 绘制笔迹
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# 1.为保证笔迹实时显示，必须在移动的同时绘制笔迹
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# 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)
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# 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）
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************************************************ */
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draw: function() {
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let point1 = this.points[0];
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let point2 = this.points[1];
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this.points.shift();
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this.ctx.strokeStyle = 'red';
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this.ctx.lineWidth = 2;
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this.ctx.moveTo(point1.X, point1.Y);
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this.ctx.lineTo(point2.X, point2.Y);
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this.ctx.stroke();
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this.ctx.draw(true);
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},
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handleCancel() {
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uni.navigateBack({
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delta: 1
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});
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},
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//清空画布
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handleReset: function() {
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var that = this
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that.ctx.clearRect(0, 0, 624, 224);
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that.ctx.draw(true);
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tempPoint = [];
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that.init()
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},
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//将签名笔迹上传到服务器，并将返回来的地址存到本地
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handleConfirm: function() {
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let that = this
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uni.canvasToTempFilePath({
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canvasId: 'mycanvas',
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success: function(e) {
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const myPromise = new Promise((resolve, reject) => {
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// 执行异步操作
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// 当操作完成时调用resolve()或reject()
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pathToBase64(e.tempFilePath).then(path => {
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that.url = path
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uni.setStorageSync('hzzsImg', that.url)
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uni.navigateBack({
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delta: 1
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});
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})
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.catch(error => {
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console.error(error)
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})
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});
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}
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});
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},
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base64ToFile(base64, name) {
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if (typeof base64 != 'string') {
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return;
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}
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var arr = base64.split(',')
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var type = arr[0].match(/:(.*?);/)[1]
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var fileExt = type.split('/')[1]
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var bstr = atob(arr[1])
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var n = bstr.length
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var u8arr = new Uint8Array(n)
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while (n--) {
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u8arr[n] = bstr.charCodeAt(n)
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}
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return new File([u8arr], `${name}.` + fileExt, {
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type: type
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})
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},
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}
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};
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</script>
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<style lang="scss" scoped>
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.container {
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height: calc(100vh - 68px);
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padding-bottom: 30px;
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background-color: #fff;
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}
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.sign-box {
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display: flex;
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justify-content: center;
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position: relative;
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margin-top: 48px;
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}
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.sign-view {
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height: 100%;
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}
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.sigh-btns {
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display: flex;
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justify-content: center;
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}
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.btn {
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margin: 100px 10px 0;
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}
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/deep/.van-button {
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width: 100px;
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height: 50px;
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background-color: #fff;
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}
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.mycanvas {
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margin: auto 0rpx;
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background-color: transparent;
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margin-top: 130px;
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width: 624px;
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height: 224px;
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z-index: 999;
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transform: scale(1.75)
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}
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.canvasBg {
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width: 624px;
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height: 224px;
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position: absolute;
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top: 130px;
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transform: scale(1.75)
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}
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.canvsborder {
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border: 1rpx solid #333;
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position: fixed;
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top: 0;
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left: 10000rpx;
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}
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</style> |