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639 lines
16 KiB
639 lines
16 KiB
<template>
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<view class="container">
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<view class="page-body uni-content-info">
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<view class='cropper-content'>
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<view v-if="isShowImg" class="uni-corpper" :style="'width:'+cropperInitW+'px;height:'+cropperInitH+'px;background:#000'">
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<view class="uni-corpper-content" :style="'width:'+cropperW+'px;height:'+cropperH+'px;left:'+cropperL+'px;top:'+cropperT+'px'">
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<image :src="imageSrc" :style="'width:'+cropperW+'px;height:'+cropperH+'px'"></image>
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<view class="uni-corpper-crop-box" @touchstart.stop="contentStartMove" @touchmove.stop="contentMoveing" @touchend.stop="contentTouchEnd"
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:style="'left:'+cutL+'px;top:'+cutT+'px;right:'+cutR+'px;bottom:'+cutB+'px'">
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<view class="uni-cropper-view-box">
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<view class="uni-cropper-dashed-h"></view>
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<view class="uni-cropper-dashed-v"></view>
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<view class="uni-cropper-line-t" data-drag="top" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
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<view class="uni-cropper-line-r" data-drag="right" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
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<view class="uni-cropper-line-b" data-drag="bottom" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
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<view class="uni-cropper-line-l" data-drag="left" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
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<view class="uni-cropper-point point-t" data-drag="top" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
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<view class="uni-cropper-point point-tr" data-drag="topTight"></view>
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<view class="uni-cropper-point point-r" data-drag="right" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
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<view class="uni-cropper-point point-rb" data-drag="rightBottom" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
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<view class="uni-cropper-point point-b" data-drag="bottom" @touchstart.stop="dragStart" @touchmove.stop="dragMove" @touchend.stop="dragEnd"></view>
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<view class="uni-cropper-point point-bl" data-drag="bottomLeft"></view>
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<view class="uni-cropper-point point-l" data-drag="left" @touchstart.stop="dragStart" @touchmove.stop="dragMove"></view>
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<view class="uni-cropper-point point-lt" data-drag="leftTop"></view>
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</view>
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</view>
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</view>
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</view>
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</view>
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<view class='cropper-config'>
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<button type="primary reverse" @click="getImage" style='margin-top: 30rpx;'> 选择图片 </button>
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<button type="warn" @click="getImageInfo" style='margin-top: 30rpx;'> 点击生成图片 </button>
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</view>
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<canvas canvas-id="myCanvas" :style="'position:absolute;border: 1px solid red; width:'+imageW+'px;height:'+imageH+'px;top:-9999px;left:-9999px;'"></canvas>
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</view>
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<page-foot :name="name"></page-foot>
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</view>
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</template>
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<script>
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let sysInfo = uni.getSystemInfoSync();
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let SCREEN_WIDTH = sysInfo.screenWidth
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let PAGE_X, // 手按下的x位置
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PAGE_Y, // 手按下y的位置
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PR = sysInfo.pixelRatio, // dpi
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T_PAGE_X, // 手移动的时候x的位置
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T_PAGE_Y, // 手移动的时候Y的位置
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CUT_L, // 初始化拖拽元素的left值
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CUT_T, // 初始化拖拽元素的top值
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CUT_R, // 初始化拖拽元素的
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CUT_B, // 初始化拖拽元素的
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CUT_W, // 初始化拖拽元素的宽度
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CUT_H, // 初始化拖拽元素的高度
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IMG_RATIO, // 图片比例
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IMG_REAL_W, // 图片实际的宽度
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IMG_REAL_H, // 图片实际的高度
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DRAFG_MOVE_RATIO = 1, //移动时候的比例,
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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
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DRAW_IMAGE_W = sysInfo.screenWidth // 设置生成的图片宽度
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export default {
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/**
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* 页面的初始数据
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*/
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data() {
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return {
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name:'杨大宝',
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imageSrc: 'https://vkceyugu.cdn.bspapp.com/VKCEYUGU-dc-site/b31d90c0-5168-11eb-bdc1-8bd33eb6adaa.jpg',
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isShowImg: false,
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// 初始化的宽高
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cropperInitW: SCREEN_WIDTH,
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cropperInitH: SCREEN_WIDTH,
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// 动态的宽高
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cropperW: SCREEN_WIDTH,
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cropperH: SCREEN_WIDTH,
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// 动态的left top值
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cropperL: 0,
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cropperT: 0,
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transL: 0,
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transT: 0,
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// 图片缩放值
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scaleP: 0,
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imageW: 0,
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imageH: 0,
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// 裁剪框 宽高
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cutL: 0,
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cutT: 0,
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cutB: SCREEN_WIDTH,
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cutR: '100%',
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qualityWidth: DRAW_IMAGE_W,
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innerAspectRadio: DRAFG_MOVE_RATIO
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}
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},
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/**
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* 生命周期函数--监听页面加载
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*/
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onLoad: function (options) {},
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/**
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* 生命周期函数--监听页面初次渲染完成
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*/
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onReady: function () {
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this.loadImage();
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},
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methods: {
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setData: function (obj) {
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let that = this;
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Object.keys(obj).forEach(function (key) {
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that.$set(that.$data, key, obj[key])
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});
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},
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getImage: function () {
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var _this = this
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uni.chooseImage({
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success: function (res) {
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_this.setData({
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imageSrc: res.tempFilePaths[0],
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})
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_this.loadImage();
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},
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})
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},
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loadImage: function () {
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var _this = this
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uni.showLoading({
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title: '图片加载中...',
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})
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uni.getImageInfo({
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src: _this.imageSrc,
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success: function success(res) {
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IMG_RATIO = res.width / res.height
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if (IMG_RATIO >= 1) {
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IMG_REAL_W = SCREEN_WIDTH
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IMG_REAL_H = SCREEN_WIDTH / IMG_RATIO
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} else {
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IMG_REAL_W = SCREEN_WIDTH * IMG_RATIO
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IMG_REAL_H = SCREEN_WIDTH
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}
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let minRange = IMG_REAL_W > IMG_REAL_H ? IMG_REAL_W : IMG_REAL_H
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INIT_DRAG_POSITION = minRange > INIT_DRAG_POSITION ? INIT_DRAG_POSITION : minRange
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// 根据图片的宽高显示不同的效果 保证图片可以正常显示
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if (IMG_RATIO >= 1) {
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let cutT = Math.ceil((SCREEN_WIDTH / IMG_RATIO - (SCREEN_WIDTH / IMG_RATIO - INIT_DRAG_POSITION)) / 2);
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let cutB = cutT;
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let cutL = Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH + INIT_DRAG_POSITION) / 2);
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let cutR = cutL;
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_this.setData({
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cropperW: SCREEN_WIDTH,
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cropperH: SCREEN_WIDTH / IMG_RATIO,
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// 初始化left right
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cropperL: Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH) / 2),
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cropperT: Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH / IMG_RATIO) / 2),
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cutL: cutL,
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cutT: cutT,
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cutR: cutR,
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cutB: cutB,
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// 图片缩放值
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imageW: IMG_REAL_W,
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imageH: IMG_REAL_H,
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scaleP: IMG_REAL_W / SCREEN_WIDTH,
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qualityWidth: DRAW_IMAGE_W,
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innerAspectRadio: IMG_RATIO
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})
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} else {
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let cutL = Math.ceil((SCREEN_WIDTH * IMG_RATIO - (SCREEN_WIDTH * IMG_RATIO)) / 2);
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let cutR = cutL;
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let cutT = Math.ceil((SCREEN_WIDTH - INIT_DRAG_POSITION) / 2);
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let cutB = cutT;
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_this.setData({
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cropperW: SCREEN_WIDTH * IMG_RATIO,
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cropperH: SCREEN_WIDTH,
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// 初始化left right
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cropperL: Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH * IMG_RATIO) / 2),
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cropperT: Math.ceil((SCREEN_WIDTH - SCREEN_WIDTH) / 2),
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cutL: cutL,
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cutT: cutT,
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cutR: cutR,
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cutB: cutB,
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// 图片缩放值
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imageW: IMG_REAL_W,
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imageH: IMG_REAL_H,
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scaleP: IMG_REAL_W / SCREEN_WIDTH,
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qualityWidth: DRAW_IMAGE_W,
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innerAspectRadio: IMG_RATIO
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})
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}
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_this.setData({
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isShowImg: true
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})
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uni.hideLoading()
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}
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})
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},
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// 拖动时候触发的touchStart事件
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contentStartMove(e) {
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PAGE_X = e.touches[0].pageX
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PAGE_Y = e.touches[0].pageY
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},
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// 拖动时候触发的touchMove事件
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contentMoveing(e) {
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var _this = this
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var dragLengthX = (PAGE_X - e.touches[0].pageX) * DRAFG_MOVE_RATIO
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var dragLengthY = (PAGE_Y - e.touches[0].pageY) * DRAFG_MOVE_RATIO
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// 左移
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if (dragLengthX > 0) {
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if (this.cutL - dragLengthX < 0) dragLengthX = this.cutL
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} else {
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if (this.cutR + dragLengthX < 0) dragLengthX = -this.cutR
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}
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if (dragLengthY > 0) {
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if (this.cutT - dragLengthY < 0) dragLengthY = this.cutT
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} else {
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if (this.cutB + dragLengthY < 0) dragLengthY = -this.cutB
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}
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this.setData({
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cutL: this.cutL - dragLengthX,
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cutT: this.cutT - dragLengthY,
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cutR: this.cutR + dragLengthX,
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cutB: this.cutB + dragLengthY
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})
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PAGE_X = e.touches[0].pageX
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PAGE_Y = e.touches[0].pageY
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},
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contentTouchEnd() {
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},
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// 获取图片
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getImageInfo() {
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var _this = this;
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uni.showLoading({
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title: '图片生成中...',
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});
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// 将图片写入画布
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const ctx = uni.createCanvasContext('myCanvas');
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ctx.drawImage(_this.imageSrc, 0, 0, IMG_REAL_W, IMG_REAL_H);
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ctx.draw(true, () => {
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// 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)
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var canvasW = ((_this.cropperW - _this.cutL - _this.cutR) / _this.cropperW) * IMG_REAL_W;
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var canvasH = ((_this.cropperH - _this.cutT - _this.cutB) / _this.cropperH) * IMG_REAL_H;
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var canvasL = (_this.cutL / _this.cropperW) * IMG_REAL_W;
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var canvasT = (_this.cutT / _this.cropperH) * IMG_REAL_H;
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uni.canvasToTempFilePath({
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x: canvasL,
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y: canvasT,
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width: canvasW,
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height: canvasH,
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destWidth: canvasW,
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destHeight: canvasH,
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quality: 0.5,
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canvasId: 'myCanvas',
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success: function (res) {
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uni.hideLoading()
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// 成功获得地址的地方
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uni.previewImage({
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current: '', // 当前显示图片的http链接
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urls: [res.tempFilePath] // 需要预览的图片http链接列表
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})
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}
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});
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});
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},
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// 设置大小的时候触发的touchStart事件
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dragStart(e) {
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T_PAGE_X = e.touches[0].pageX
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T_PAGE_Y = e.touches[0].pageY
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CUT_L = this.cutL
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CUT_R = this.cutR
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CUT_B = this.cutB
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CUT_T = this.cutT
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},
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// 设置大小的时候触发的touchMove事件
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dragMove(e) {
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var _this = this
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var dragType = e.target.dataset.drag
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switch (dragType) {
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case 'right':
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var dragLength = (T_PAGE_X - e.touches[0].pageX) * DRAFG_MOVE_RATIO
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if (CUT_R + dragLength < 0) dragLength = -CUT_R
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this.setData({
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cutR: CUT_R + dragLength
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})
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break;
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case 'left':
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var dragLength = (T_PAGE_X - e.touches[0].pageX) * DRAFG_MOVE_RATIO
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if (CUT_L - dragLength < 0) dragLength = CUT_L
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if ((CUT_L - dragLength) > (this.cropperW - this.cutR)) dragLength = CUT_L - (this.cropperW - this.cutR)
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this.setData({
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cutL: CUT_L - dragLength
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})
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break;
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case 'top':
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var dragLength = (T_PAGE_Y - e.touches[0].pageY) * DRAFG_MOVE_RATIO
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if (CUT_T - dragLength < 0) dragLength = CUT_T
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if ((CUT_T - dragLength) > (this.cropperH - this.cutB)) dragLength = CUT_T - (this.cropperH - this.cutB)
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this.setData({
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cutT: CUT_T - dragLength
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})
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break;
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case 'bottom':
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var dragLength = (T_PAGE_Y - e.touches[0].pageY) * DRAFG_MOVE_RATIO
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if (CUT_B + dragLength < 0) dragLength = -CUT_B
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this.setData({
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cutB: CUT_B + dragLength
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})
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break;
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case 'rightBottom':
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var dragLengthX = (T_PAGE_X - e.touches[0].pageX) * DRAFG_MOVE_RATIO
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var dragLengthY = (T_PAGE_Y - e.touches[0].pageY) * DRAFG_MOVE_RATIO
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if (CUT_B + dragLengthY < 0) dragLengthY = -CUT_B
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if (CUT_R + dragLengthX < 0) dragLengthX = -CUT_R
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let cutB = CUT_B + dragLengthY;
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let cutR = CUT_R + dragLengthX;
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this.setData({
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cutB: cutB,
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cutR: cutR
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})
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break;
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default:
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break;
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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>
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/* pages/uni-cropper/index.wxss */
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.uni-content-info {
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/* position: fixed;
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top: 0;
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left: 0;
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right: 0;
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bottom: 0;
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display: block;
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align-items: center;
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flex-direction: column; */
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}
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.cropper-config {
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padding: 20rpx 40rpx;
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}
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.cropper-content {
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min-height: 750rpx;
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width: 100%;
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}
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.uni-corpper {
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position: relative;
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overflow: hidden;
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-webkit-user-select: none;
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-moz-user-select: none;
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-ms-user-select: none;
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user-select: none;
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-webkit-tap-highlight-color: transparent;
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-webkit-touch-callout: none;
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box-sizing: border-box;
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}
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.uni-corpper-content {
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position: relative;
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}
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.uni-corpper-content image {
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display: block;
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width: 100%;
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min-width: 0 !important;
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max-width: none !important;
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height: 100%;
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min-height: 0 !important;
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max-height: none !important;
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image-orientation: 0deg !important;
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margin: 0 auto;
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}
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/* 移动图片效果 */
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.uni-cropper-drag-box {
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position: absolute;
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top: 0;
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right: 0;
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bottom: 0;
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left: 0;
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cursor: move;
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background: rgba(0, 0, 0, 0.6);
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z-index: 1;
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}
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/* 内部的信息 */
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.uni-corpper-crop-box {
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position: absolute;
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background: rgba(255, 255, 255, 0.3);
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z-index: 2;
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}
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.uni-corpper-crop-box .uni-cropper-view-box {
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position: relative;
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display: block;
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width: 100%;
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height: 100%;
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overflow: visible;
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outline: 1rpx solid #69f;
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outline-color: rgba(102, 153, 255, .75)
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}
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/* 横向虚线 */
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.uni-cropper-dashed-h {
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position: absolute;
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top: 33.33333333%;
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left: 0;
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width: 100%;
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height: 33.33333333%;
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border-top: 1rpx dashed rgba(255, 255, 255, 0.5);
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border-bottom: 1rpx dashed rgba(255, 255, 255, 0.5);
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}
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/* 纵向虚线 */
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.uni-cropper-dashed-v {
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position: absolute;
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left: 33.33333333%;
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top: 0;
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width: 33.33333333%;
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height: 100%;
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border-left: 1rpx dashed rgba(255, 255, 255, 0.5);
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border-right: 1rpx dashed rgba(255, 255, 255, 0.5);
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|
}
|
|
/* 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>
|
|
|