luoyang-uniapp-app/pages/carEntry/signature/signature.vue

<template>
	<view class="pageBg">
		<view class="signature-box">
			<view class="topTps">需要您签名确认学时</view>
			<!-- 签名 -->
			<view class="signature">
				<canvas ref="mycanvas" class="mycanvas" canvas-id="mycanvas" @touchstart="touchstart" @touchmove="touchmove"
					@touchend="touchend"></canvas>
			</view>
			<view class="footBox">
				<view class="checkCon">
					<u-checkbox-group>
						<!-- <u-checkbox v-model="checked">本人【 {{realName}} 】承诺以上签名真实有效</u-checkbox> -->
						<u-checkbox  :checked="checked"  :label="`本人【 ${realName} 】承诺以上签名真实有效`" :labelSize="12" @change="checkedchange" ></u-checkbox>
					</u-checkbox-group>
					
				</view>
				<view class="footBtn">
					<view class="btn border"  @click="clear">重签</view>
					<view class="btn"  @click="finish">提交</view>
				</view>
			</view>
		</view>
	</view>
	
</template>
<script>
	// import { pathToBase64 } from '@/common/js/jssdk_image_tools.js'
	var x = 20;
	var y = 20;
	export default {
		data() {
			return {
				//绘图图像
				ctx: '',
				//路径点集合
				points: [],
				//签名图片
				SignatureImg: '',
				hasSign: false,
				realName: '',
				checked: false,
			};
		},
		
		mounted() {
			this.createCanvas();
			this.realName = this.vuex_userInfo.name
			console.log(this.vuex_userInfo.name)
		},
		methods: {
			checkedchange(val) {
				this.checked = val
			},
			
			//关闭并清空画布
			close() {
				this.$emit('closeCanvas');
				this.clear();
			},
			//创建并显示画布
			createCanvas() {
				this.ctx = uni.createCanvasContext('mycanvas', this); //创建绘图对象
				this.ctx.setFillStyle('#000000')
				this.ctx.fillStyle = '#000000'
				//设置画笔样式
				this.ctx.lineWidth = 6;
				this.ctx.lineCap = 'round';
				this.ctx.lineJoin = 'round';
			},
			//触摸开始，获取到起点
			touchstart(e) {
				let startX = e.changedTouches[0].x;
				let startY = e.changedTouches[0].y;
				let startPoint = {
					X: startX,
					Y: startY
				};
				this.points.push(startPoint);
				//每次触摸开始，开启新的路径
				this.ctx.beginPath();
			},
			//触摸移动，获取到路径点
			touchmove(e) {
				let moveX = e.changedTouches[0].x;
				let moveY = e.changedTouches[0].y;
				let movePoint = {
					X: moveX,
					Y: moveY
				};
				this.points.push(movePoint); //存点
				let len = this.points.length;
				if (len >= 2) {
					this.draw(); //绘制路径
				}
			},
			// 触摸结束，将未绘制的点清空防止对后续路径产生干扰
			touchend() {
				this.points = [];
			},
			//绘制笔迹
			draw() {
				let point1 = this.points[0];
				let point2 = this.points[1];
				this.points.shift();
				this.ctx.moveTo(point1.X, point1.Y);
				this.ctx.lineTo(point2.X, point2.Y);
				this.ctx.stroke();
				this.ctx.draw(true);
				this.hasSign = true
			},
			//清空画布
			clear() {
				this.hasSign = false
				let that = this;
				this.createCanvas();
				uni.getSystemInfo({
					success: function(res) {
						let canvasw = res.windowWidth;
						let canvash = res.windowHeight;
						that.ctx.clearRect(0, 0, canvasw, canvash);
						that.ctx.draw(true);
					}
				});
			},
			//完成绘画并保存到本地
			finish() {
				if(!this.checked) {
					return this.$u.toast('请勾选承诺')
				}
				if (!this.hasSign) {
					uni.showToast({
						title: '签名为空不能保存',
						icon: 'none',
						duration: 2000
					})
					return
				}
				let that = this;
				uni.canvasToTempFilePath({
					canvasId: 'mycanvas',
					destWidth:160,
					success: function(res) {
						console.log('图片上传结果')
						console.log(res)
						if(!res || !res.tempFilePath) {
							console.log('没来这里？')
							that.SignatureImg = res.tempFilePath;
							console.log(that.SignatureImg)
							// that.$emit('closeCanvas', that.SignatureImg);
						}else{
							that.$emit('closeCanvas', res.tempFilePath);
							console.log('这是临时路径？')
							console.log(res.tempFilePath)
							console.log(that.SignatureImg)
							// //用来解决安卓真机获取到的是canvas图片的临时路径，转成base64格式
							// pathToBase64(res.tempFilePath).then(re => {
							// 	that.SignatureImg = re;
							// 	that.$emit('getCanvasImg', that.SignatureImg);
							// })
						}
					},
					
				});
			}
		}
	};
</script>
<style lang="scss" scoped>
	.signature-box {
		padding: 0 32rpx;
		display: flex;
		flex-direction: column;
		width: 100%;
		// height: 98%;
		height: calc(100vh - 150rpx);
		background: #fff;
		.topTps {
			width: 100%;
			border-radius: 8rpx;
			background-color: #f1f1f1;
			height: 110rpx;
			line-height: 110rpx;
			text-align: center;
			font-size: 34rpx;
			color: #333;
		}
		.footBox {
			
			.checkCon {
				width: 100%;
				height: 100rpx;
				display: flex;
				align-items: center;
			}
			.footBtn {
				display: flex;
				justify-content: space-between;
				.btn {
					width: 49%;
					font-size: 32rpx;
					line-height: 90rpx;
					height: 90rpx;
					color: #fff;
					border-radius: 14rpx;
					background: linear-gradient(180deg, #3593FB 0%, #53D3E5 100%);;
					text-align: center;
					&.border {
						border: 1rpx solid #218dff ;
						color: #218dff;
						background: #fff;
					}
				}
				
			}
		}
		//签名模块
		.signature {
			flex: 1;
			// height: 0;
			// width: 0;
			//canvas
			.mycanvas {
				width:100%;
				height:100%;
				background-color: #fff;
				border-radius: 10px 10px 0 0;
			}
			
		}
	}
</style>