220 lines
5.0 KiB
Vue
220 lines
5.0 KiB
Vue
<template>
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<view class="container">
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<view class="sign-box">
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<canvas class="mycanvas" :style="{width:width +'px',height:height +'px'}" canvas-id="mycanvas"
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@touchstart="touchstart" @touchmove="touchmove" @touchend="touchend"></canvas>
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<canvas canvas-id="camCacnvs" :style="{width:height +'px',height:width +'px'}" class="canvsborder"></canvas>
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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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</template>
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<script>
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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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let canvasw;
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let canvash;
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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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};
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},
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mounted() {},
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onLoad(option) {
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that = this;
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console.log(option);
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id = option.id;
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type = option.type;
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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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uni.getSystemInfo({
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success: function(res) {
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console.log(res);
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that.width = res.windowWidth * 0.8;
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that.height = res.windowHeight * 0.85;
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}
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});
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},
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methods: {
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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,
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Y: startY
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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,
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Y: moveY
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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.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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console.log('handleReset');
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that.ctx.clearRect(0, 0, that.width, that.height);
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that.ctx.draw(true);
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tempPoint = [];
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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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if (tempPoint.length == 0) {
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uni.showToast({
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title: '请先签名',
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icon: 'none',
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duration: 2000
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});
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return;
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}
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uni.canvasToTempFilePath({
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canvasId: 'mycanvas',
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success: function(res) {
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let tempPath = res.tempFilePath;
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console.log(tempPath)
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const ctx = uni.createCanvasContext('camCacnvs', that);
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ctx.translate(0, that.width);
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ctx.rotate((-90 * Math.PI) / 180);
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ctx.drawImage(tempPath, 0, 0, that.width, that.height);
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ctx.draw();
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setTimeout(() => {
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//保存签名图片到本地
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uni.canvasToTempFilePath({
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canvasId: 'camCacnvs',
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success: function(res) {
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//这是签名图片文件的本地临时地址
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let path = res.tempFilePath;
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},
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fail: err => {
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console.log('fail', err);
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}
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},
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this
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);
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}, 200);
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}
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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 - 44px);
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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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width: 80%;
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height: 90%;
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margin: auto;
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display: flex;
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flex-direction: column;
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text-align: center;
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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: 30px 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: #ececec;
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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> |