bm/pages/mine/avatar/index.vue

<template>
	<!-- <view class="container">
		<view class="page-body uni-content-info">
			<view class='cropper-content'>
				<view v-if="isShowImg" class="uni-corpper" :style="'width:'+cropperInitW+'px;height:'+cropperInitH+'px;background:#000'">
					<view class="uni-corpper-content" :style="'width:'+cropperW+'px;height:'+cropperH+'px;left:'+cropperL+'px;top:'+cropperT+'px'">
						<image :src="imageSrc" :style="'width:'+cropperW+'px;height:'+cropperH+'px'"></image>
						<view class="uni-corpper-crop-box" @touchstart.stop="contentStartMove" @touchmove.stop="contentMoveing" @touchend.stop="contentTouchEnd"
						    :style="'left:'+cutL+'px;top:'+cutT+'px;right:'+cutR+'px;bottom:'+cutB+'px'">
							<view class="uni-cropper-view-box">
								<view class="uni-cropper-dashed-h"></view>
								<view class="uni-cropper-dashed-v"></view>
								<view class="uni-cropper-line-t" data-drag="top" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
								<view class="uni-cropper-line-r" data-drag="right" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
								<view class="uni-cropper-line-b" data-drag="bottom" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
								<view class="uni-cropper-line-l" data-drag="left" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
								<view class="uni-cropper-point point-t" data-drag="top" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
								<view class="uni-cropper-point point-tr" data-drag="topTight"></view>
								<view class="uni-cropper-point point-r" data-drag="right" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
								<view class="uni-cropper-point point-rb" data-drag="rightBottom" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
								<view class="uni-cropper-point point-b" data-drag="bottom" @touchstart.stop="dragStart" @touchmove.stop="dragMove" @touchend.stop="dragEnd"></view>
								<view class="uni-cropper-point point-bl" data-drag="bottomLeft"></view>
								<view class="uni-cropper-point point-l" data-drag="left" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
								<view class="uni-cropper-point point-lt" data-drag="leftTop"></view>
							</view>
						</view>
					</view>
				</view>
			</view>
			<view class='cropper-config'>
				<button type="primary reverse" @click="getImage" style='margin-top: 30rpx;'> 选择头像 </button>
				<button type="warn" @click="getImageInfo" style='margin-top: 30rpx;'> 提交 </button>
			</view>
			<canvas canvas-id="myCanvas" :style="'position:absolute;border: 1px solid red; width:'+imageW+'px;height:'+imageH+'px;top:-9999px;left:-9999px;'"></canvas>
		</view>
	</view> -->
</template>

<script>
 //  import config from '@/config'
 //  import store from "@/store"
 //  import { uploadAvatar } from "@/api/system/user"
  
 //  const baseUrl = config.baseUrl
	// let sysInfo = uni.getSystemInfoSync()
	// let SCREEN_WIDTH = sysInfo.screenWidth
	// let PAGE_X, // 手按下的x位置
	// 	PAGE_Y, // 手按下y的位置 
	// 	PR = sysInfo.pixelRatio, // dpi
	// 	T_PAGE_X, // 手移动的时候x的位置
	// 	T_PAGE_Y, // 手移动的时候Y的位置
	// 	CUT_L, // 初始化拖拽元素的left值
	// 	CUT_T, // 初始化拖拽元素的top值
	// 	CUT_R, // 初始化拖拽元素的
	// 	CUT_B, // 初始化拖拽元素的
	// 	CUT_W, // 初始化拖拽元素的宽度
	// 	CUT_H, //  初始化拖拽元素的高度
	// 	IMG_RATIO, // 图片比例
	// 	IMG_REAL_W, // 图片实际的宽度
	// 	IMG_REAL_H, // 图片实际的高度
	// 	DRAFG_MOVE_RATIO = 1, //移动时候的比例,
	// 	INIT_DRAG_POSITION = 100, // 初始化屏幕宽度和裁剪区域的宽度之差，用于设置初始化裁剪的宽度
	// 	DRAW_IMAGE_W = sysInfo.screenWidth // 设置生成的图片宽度

	// export default {
	// 	/**
	// 	 * 页面的初始数据
	// 	 */
	// 	data() {
	// 		return {
	// 			imageSrc: store.getters.avatar,
	// 			isShowImg: false,
	// 			// 初始化的宽高
	// 			cropperInitW: SCREEN_WIDTH,
	// 			cropperInitH: SCREEN_WIDTH,
	// 			// 动态的宽高
	// 			cropperW: SCREEN_WIDTH,
	// 			cropperH: SCREEN_WIDTH,
	// 			// 动态的left top值
	// 			cropperL: 0,
	// 			cropperT: 0,

	// 			transL: 0,
	// 			transT: 0,

	// 			// 图片缩放值
	// 			scaleP: 0,
	// 			imageW: 0,
	// 			imageH: 0,

	// 			// 裁剪框 宽高
	// 			cutL: 0,
	// 			cutT: 0,
	// 			cutB: SCREEN_WIDTH,
	// 			cutR: '100%',
	// 			qualityWidth: DRAW_IMAGE_W,
	// 			innerAspectRadio: DRAFG_MOVE_RATIO
	// 		}
	// 	},
	// 	/**
	// 	 * 生命周期函数--监听页面初次渲染完成
	// 	 */
	// 	onReady: function () {
	// 		this.loadImage()
	// 	},
	// 	methods: {
	// 		setData: function (obj) {
	// 			let that = this
	// 			Object.keys(obj).forEach(function (key) {
	// 				that.$set(that.$data, key, obj[key])
	// 			})
	// 		},
	// 		getImage: function () {
	// 			var _this = this
	// 			uni.chooseImage({
	// 				success: function (res) {
	// 					_this.setData({
	// 						imageSrc: res.tempFilePaths[0],
	// 					})
	// 					_this.loadImage()
	// 				},
	// 			})
	// 		},
	// 		loadImage: function () {
	// 			var _this = this

	// 			uni.getImageInfo({
	// 				src: _this.imageSrc,
	// 				success: function success(res) {
	// 					IMG_RATIO = 1 / 1
	// 					if (IMG_RATIO >= 1) {
	// 						IMG_REAL_W = SCREEN_WIDTH
	// 						IMG_REAL_H = SCREEN_WIDTH / IMG_RATIO
	// 					} else {
	// 						IMG_REAL_W = SCREEN_WIDTH * IMG_RATIO
	// 						IMG_REAL_H = SCREEN_WIDTH
	// 					}
	// 					let minRange = IMG_REAL_W > IMG_REAL_H ? IMG_REAL_W : IMG_REAL_H
	// 					INIT_DRAG_POSITION = minRange > INIT_DRAG_POSITION ? INIT_DRAG_POSITION : minRange
	// 					// 根据图片的宽高显示不同的效果   保证图片可以正常显示
	// 					if (IMG_RATIO >= 1) {
	// 						let cutT = Math.ceil((SCREEN_WIDTH / IMG_RATIO - (SCREEN_WIDTH / IMG_RATIO - INIT_DRAG_POSITION)) / 2)
	// 						let cutB = cutT
	// 						let cutL = Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH + INIT_DRAG_POSITION) / 2)
	// 						let cutR = cutL
	// 						_this.setData({
	// 							cropperW: SCREEN_WIDTH,
	// 							cropperH: SCREEN_WIDTH / IMG_RATIO,
	// 							// 初始化left right
	// 							cropperL: Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH) / 2),
	// 							cropperT: Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH / IMG_RATIO) / 2),
	// 							cutL: cutL,
	// 							cutT: cutT,
	// 							cutR: cutR,
	// 							cutB: cutB,
	// 							// 图片缩放值
	// 							imageW: IMG_REAL_W,
	// 							imageH: IMG_REAL_H,
	// 							scaleP: IMG_REAL_W / SCREEN_WIDTH,
	// 							qualityWidth: DRAW_IMAGE_W,
	// 							innerAspectRadio: IMG_RATIO
	// 						})
	// 					} else {
	// 						let cutL = Math.ceil((SCREEN_WIDTH * IMG_RATIO - (SCREEN_WIDTH * IMG_RATIO)) / 2)
	// 						let cutR = cutL
	// 						let cutT = Math.ceil((SCREEN_WIDTH - INIT_DRAG_POSITION) / 2)
	// 						let cutB = cutT
	// 						_this.setData({
	// 							cropperW: SCREEN_WIDTH * IMG_RATIO,
	// 							cropperH: SCREEN_WIDTH,
	// 							// 初始化left right
	// 							cropperL: Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH * IMG_RATIO) / 2),
	// 							cropperT: Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH) / 2),

	// 							cutL: cutL,
	// 							cutT: cutT,
	// 							cutR: cutR,
	// 							cutB: cutB,
	// 							// 图片缩放值
	// 							imageW: IMG_REAL_W,
	// 							imageH: IMG_REAL_H,
	// 							scaleP: IMG_REAL_W / SCREEN_WIDTH,
	// 							qualityWidth: DRAW_IMAGE_W,
	// 							innerAspectRadio: IMG_RATIO
	// 						})
	// 					}
	// 					_this.setData({
	// 						isShowImg: true
	// 					})
	// 					uni.hideLoading()
	// 				}
	// 			})
	// 		},
	// 		// 拖动时候触发的touchStart事件
	// 		contentStartMove(e) {
	// 			PAGE_X = e.touches[0].pageX
	// 			PAGE_Y = e.touches[0].pageY
	// 		},

	// 		// 拖动时候触发的touchMove事件
	// 		contentMoveing(e) {
	// 			var _this = this
	// 			var dragLengthX = (PAGE_X - e.touches[0].pageX) * DRAFG_MOVE_RATIO
	// 			var dragLengthY = (PAGE_Y - e.touches[0].pageY) * DRAFG_MOVE_RATIO
	// 			// 左移
	// 			if (dragLengthX > 0) {
	// 				if (this.cutL - dragLengthX < 0) dragLengthX = this.cutL
	// 			} else {
	// 				if (this.cutR + dragLengthX < 0) dragLengthX = -this.cutR
	// 			}

	// 			if (dragLengthY > 0) {
	// 				if (this.cutT - dragLengthY < 0) dragLengthY = this.cutT
	// 			} else {
	// 				if (this.cutB + dragLengthY < 0) dragLengthY = -this.cutB
	// 			}
	// 			this.setData({
	// 				cutL: this.cutL - dragLengthX,
	// 				cutT: this.cutT - dragLengthY,
	// 				cutR: this.cutR + dragLengthX,
	// 				cutB: this.cutB + dragLengthY
	// 			})

	// 			PAGE_X = e.touches[0].pageX
	// 			PAGE_Y = e.touches[0].pageY
	// 		},

	// 		contentTouchEnd() {

	// 		},

	// 		// 获取图片
	// 		getImageInfo() {
	// 			var _this = this
	// 			uni.showLoading({
	// 				title: '图片生成中...',
	// 			})
	// 			// 将图片写入画布
	// 			const ctx = uni.createCanvasContext('myCanvas')
	// 			ctx.drawImage(_this.imageSrc, 0, 0, IMG_REAL_W, IMG_REAL_H)
	// 			ctx.draw(true, () => {
	// 				// 获取画布要裁剪的位置和宽度   均为百分比 * 画布中图片的宽度    保证了在微信小程序中裁剪的图片模糊  位置不对的问题 canvasT = (_this.cutT / _this.cropperH) * (_this.imageH / pixelRatio)
	// 				var canvasW = ((_this.cropperW - _this.cutL - _this.cutR) / _this.cropperW) * IMG_REAL_W
	// 				var canvasH = ((_this.cropperH - _this.cutT - _this.cutB) / _this.cropperH) * IMG_REAL_H
	// 				var canvasL = (_this.cutL / _this.cropperW) * IMG_REAL_W
	// 				var canvasT = (_this.cutT / _this.cropperH) * IMG_REAL_H
	// 				uni.canvasToTempFilePath({
	// 					x: canvasL,
	// 					y: canvasT,
	// 					width: canvasW,
	// 					height: canvasH,
	// 					destWidth: canvasW,
	// 					destHeight: canvasH,
	// 					quality: 0.5,
	// 					canvasId: 'myCanvas',
	// 					success: function (res) {
	// 						uni.hideLoading()
	// 						let data = {name: 'avatarfile', filePath: res.tempFilePath}
	// 						uploadAvatar(data).then(response => {
	// 							store.commit('SET_AVATAR', baseUrl + response.imgUrl)
	// 							uni.showToast({ title: "修改成功", icon: 'success' })
	// 							uni.navigateBack()
	// 						})
	// 					}
	// 				})
	// 			})
	// 		},
	// 		// 设置大小的时候触发的touchStart事件
	// 		dragStart(e) {
	// 			T_PAGE_X = e.touches[0].pageX
	// 			T_PAGE_Y = e.touches[0].pageY
	// 			CUT_L = this.cutL
	// 			CUT_R = this.cutR
	// 			CUT_B = this.cutB
	// 			CUT_T = this.cutT
	// 		},

	// 		// 设置大小的时候触发的touchMove事件
	// 		dragMove(e) {
	// 			var _this = this
	// 			var dragType = e.target.dataset.drag
	// 			switch (dragType) {
	// 				case 'right':
	// 					var dragLength = (T_PAGE_X - e.touches[0].pageX) * DRAFG_MOVE_RATIO
	// 					if (CUT_R + dragLength < 0) dragLength = -CUT_R
	// 					this.setData({
	// 						cutR: CUT_R + dragLength
	// 					})
	// 					break
	// 				case 'left':
	// 					var dragLength = (T_PAGE_X - e.touches[0].pageX) * DRAFG_MOVE_RATIO
	// 					if (CUT_L - dragLength < 0) dragLength = CUT_L
	// 					if ((CUT_L - dragLength) > (this.cropperW - this.cutR)) dragLength = CUT_L - (this.cropperW - this.cutR)
	// 					this.setData({
	// 						cutL: CUT_L - dragLength
	// 					})
	// 					break
	// 				case 'top':
	// 					var dragLength = (T_PAGE_Y - e.touches[0].pageY) * DRAFG_MOVE_RATIO
	// 					if (CUT_T - dragLength < 0) dragLength = CUT_T
	// 					if ((CUT_T - dragLength) > (this.cropperH - this.cutB)) dragLength = CUT_T - (this.cropperH - this.cutB)
	// 					this.setData({
	// 						cutT: CUT_T - dragLength
	// 					})
	// 					break
	// 				case 'bottom':
	// 					var dragLength = (T_PAGE_Y - e.touches[0].pageY) * DRAFG_MOVE_RATIO
	// 					if (CUT_B + dragLength < 0) dragLength = -CUT_B
	// 					this.setData({
	// 						cutB: CUT_B + dragLength
	// 					})
	// 					break
	// 				case 'rightBottom':
	// 					var dragLengthX = (T_PAGE_X - e.touches[0].pageX) * DRAFG_MOVE_RATIO
	// 					var dragLengthY = (T_PAGE_Y - e.touches[0].pageY) * DRAFG_MOVE_RATIO

	// 					if (CUT_B + dragLengthY < 0) dragLengthY = -CUT_B
	// 					if (CUT_R + dragLengthX < 0) dragLengthX = -CUT_R
	// 					let cutB = CUT_B + dragLengthY
	// 					let cutR = CUT_R + dragLengthX

	// 					this.setData({
	// 						cutB: cutB,
	// 						cutR: cutR
	// 					})
	// 					break
	// 				default:
	// 					break
	// 			}
	// 		}
	// 	}
	// }
</script>

<style>
	/* pages/uni-cropper/index.wxss */

	.uni-content-info {
		/* position: fixed;
		top: 0;
		left: 0;
		right: 0;
		bottom: 0;
		display: block;
		align-items: center;
		flex-direction: column; */
	}

	.cropper-config {
		padding: 20rpx 40rpx;
	}

	.cropper-content {
		min-height: 750rpx;
		width: 100%;
	}

	.uni-corpper {
		position: relative;
		overflow: hidden;
		-webkit-user-select: none;
		-moz-user-select: none;
		-ms-user-select: none;
		user-select: none;
		-webkit-tap-highlight-color: transparent;
		-webkit-touch-callout: none;
		box-sizing: border-box;
	}

	.uni-corpper-content {
		position: relative;
	}

	.uni-corpper-content image {
		display: block;
		width: 100%;
		min-width: 0 !important;
		max-width: none !important;
		height: 100%;
		min-height: 0 !important;
		max-height: none !important;
		image-orientation: 0deg !important;
		margin: 0 auto;
	}
	/* 移动图片效果 */

	.uni-cropper-drag-box {
		position: absolute;
		top: 0;
		right: 0;
		bottom: 0;
		left: 0;
		cursor: move;
		background: rgba(0, 0, 0, 0.6);
		z-index: 1;
	}
	/* 内部的信息 */

	.uni-corpper-crop-box {
		position: absolute;
		background: rgba(255, 255, 255, 0.3);
		z-index: 2;
	}

	.uni-corpper-crop-box .uni-cropper-view-box {
		position: relative;
		display: block;
		width: 100%;
		height: 100%;
		overflow: visible;
		outline: 1rpx solid #69f;
		outline-color: rgba(102, 153, 255, .75)
	}
	/* 横向虚线 */

	.uni-cropper-dashed-h {
		position: absolute;
		top: 33.33333333%;
		left: 0;
		width: 100%;
		height: 33.33333333%;
		border-top: 1rpx dashed rgba(255, 255, 255, 0.5);
		border-bottom: 1rpx dashed rgba(255, 255, 255, 0.5);
	}
	/* 纵向虚线 */

	.uni-cropper-dashed-v {
		position: absolute;
		left: 33.33333333%;
		top: 0;
		width: 33.33333333%;
		height: 100%;
		border-left: 1rpx dashed rgba(255, 255, 255, 0.5);
		border-right: 1rpx dashed rgba(255, 255, 255, 0.5);
	}
	/* 四个方向的线  为了之后的拖动事件*/

	.uni-cropper-line-t {
		position: absolute;
		display: block;
		width: 100%;
		background-color: #69f;
		top: 0;
		left: 0;
		height: 1rpx;
		opacity: 0.1;
		cursor: n-resize;
	}

	.uni-cropper-line-t::before {
		content: '';
		position: absolute;
		top: 50%;
		right: 0rpx;
		width: 100%;
		-webkit-transform: translate3d(0, -50%, 0);
		transform: translate3d(0, -50%, 0);
		bottom: 0;
		height: 41rpx;
		background: transparent;
		z-index: 11;
	}

	.uni-cropper-line-r {
		position: absolute;
		display: block;
		background-color: #69f;
		top: 0;
		right: 0rpx;
		width: 1rpx;
		opacity: 0.1;
		height: 100%;
		cursor: e-resize;
	}

	.uni-cropper-line-r::before {
		content: '';
		position: absolute;
		top: 0;
		left: 50%;
		width: 41rpx;
		-webkit-transform: translate3d(-50%, 0, 0);
		transform: translate3d(-50%, 0, 0);
		bottom: 0;
		height: 100%;
		background: transparent;
		z-index: 11;
	}

	.uni-cropper-line-b {
		position: absolute;
		display: block;
		width: 100%;
		background-color: #69f;
		bottom: 0;
		left: 0;
		height: 1rpx;
		opacity: 0.1;
		cursor: s-resize;
	}

	.uni-cropper-line-b::before {
		content: '';
		position: absolute;
		top: 50%;
		right: 0rpx;
		width: 100%;
		-webkit-transform: translate3d(0, -50%, 0);
		transform: translate3d(0, -50%, 0);
		bottom: 0;
		height: 41rpx;
		background: transparent;
		z-index: 11;
	}

	.uni-cropper-line-l {
		position: absolute;
		display: block;
		background-color: #69f;
		top: 0;
		left: 0;
		width: 1rpx;
		opacity: 0.1;
		height: 100%;
		cursor: w-resize;
	}

	.uni-cropper-line-l::before {
		content: '';
		position: absolute;
		top: 0;
		left: 50%;
		width: 41rpx;
		-webkit-transform: translate3d(-50%, 0, 0);
		transform: translate3d(-50%, 0, 0);
		bottom: 0;
		height: 100%;
		background: transparent;
		z-index: 11;
	}

	.uni-cropper-point {
		width: 5rpx;
		height: 5rpx;
		background-color: #69f;
		opacity: .75;
		position: absolute;
		z-index: 3;
	}

	.point-t {
		top: -3rpx;
		left: 50%;
		margin-left: -3rpx;
		cursor: n-resize;
	}

	.point-tr {
		top: -3rpx;
		left: 100%;
		margin-left: -3rpx;
		cursor: n-resize;
	}

	.point-r {
		top: 50%;
		left: 100%;
		margin-left: -3rpx;
		margin-top: -3rpx;
		cursor: n-resize;
	}

	.point-rb {
		left: 100%;
		top: 100%;
		-webkit-transform: translate3d(-50%, -50%, 0);
		transform: translate3d(-50%, -50%, 0);
		cursor: n-resize;
		width: 36rpx;
		height: 36rpx;
		background-color: #69f;
		position: absolute;
		z-index: 1112;
		opacity: 1;
	}

	.point-b {
		left: 50%;
		top: 100%;
		margin-left: -3rpx;
		margin-top: -3rpx;
		cursor: n-resize;
	}

	.point-bl {
		left: 0%;
		top: 100%;
		margin-left: -3rpx;
		margin-top: -3rpx;
		cursor: n-resize;
	}

	.point-l {
		left: 0%;
		top: 50%;
		margin-left: -3rpx;
		margin-top: -3rpx;
		cursor: n-resize;
	}

	.point-lt {
		left: 0%;
		top: 0%;
		margin-left: -3rpx;
		margin-top: -3rpx;
		cursor: n-resize;
	}
	/* 裁剪框预览内容 */

/* 	.uni-cropper-viewer {
		position: relative;
		width: 100%;
		height: 100%;
		overflow: hidden;
	}

	.uni-cropper-viewer image {
		position: absolute;
		z-index: 2;
	} */
</style>