web前端|js教程
微信小程序图片区域裁剪,微信小程序,图片裁剪,微信小程序,裁剪
web前端-js教程
本篇文章主要介绍了微信小程序图片选择区域屏裁剪实现方法，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
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本文介绍了微信小程序图片选择区域屏裁剪实现方法，分享给大家。具体如下：
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效果图
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HTML代码
开始裁剪 点击上传图片 点击确认等屏裁剪 区域裁剪 重新裁剪
CSS代码
.imgCut_header{ padding: 30rpx; display: flex; justify-content: space-between; align-items: center; background: #000; color: #fff; font-size: 24rpx;}.allCavans{ margin: 20rpx auto; position: relative;}.canvasSty{ position: absolute;}.cutImg_box{ width: 100%; border-bottom: 2rpx #f98700 solid; padding-bottom: 20rpx;}.cutImg_box .cutImg_box_t{ width: 90%; margin: 20rpx auto;}.cutImg_box image{ width: 100%;}.cutImg_box .cutImg_box_b{ margin-top: 20rpx; width: 80%; height: 80rpx; line-height: 80rpx; background: #f98700; color: #fff; border-radius: 10rpx; text-align: center; margin:0rpx auto;}.selectCutMode{ background: #fff; display: flex; justify-content: space-between; align-items: center;}.selectCutMode .selectCutMode_in{ width: 100%; text-align: center; background: #fff; color: #f98700; font-size: 24rpx; padding: 20rpx;}.selectCutMode .selectCutMode_in_act{ background: #f98700; color: #fff; padding: 20rpx;}.areaSelct_box{ width: 100%; display: flex; align-items: center; height: 50rpx; justify-content: center; margin-top: 20rpx;}.areaSelct_box slider{ width: 80%;}.cutImg_box .clickCutImg_txt{ width: 100%; text-align: center; height: 50rpx; font-size: 24rpx; line-height: 50rpx; color: #999;}
JS代码部分
初始加载带入上一个页面带过来的参数路径
onLoad: function (options) { var that = this; const ctx = wx.createCanvasContext(cutImg); ctx.setGlobalAlpha(0.4) var aa = https://pintuanqu.oss-cn-/Uploads/Picture/goodsShow/1201/5a2125fc86566.jpg
//获取当前屏幕宽度 var phoneW = Number(util.nowPhoneWH()[0]*90)/100; var cutH = 150; wx.getImageInfo({ src: aa, success: function (res) { var w = phoneW; var h = (phoneW/Number(res.width))*Number(res.height) ctx.save()ctx.drawImage(aa, 0, 0, w, h) ctx.restore() ctx.setFillStyle( ed) ctx.fillRect(0, 0, phoneW, cutH) ctx.draw() that.setData({canvasW:w,canvasH:h,img:aa,cutH:cutH }) } }) },
确定选择区域开始裁剪
// 点击确认裁剪图片 okCutImg:function(){ var that = this; var canvasW = that.data.canvasW; var canvasH = that.data.canvasH; var nowCutW = that.data.cutType?canvasW:that.data.nowCutW; var nowCutH = that.data.cutType?that.data.cutH:that.data.nowCutH; var cutX = that.data.cutX; var cutY = that.data.cutY; const ctx = wx.createCanvasContext(cutImg); ctx.setGlobalAlpha(1) ctx.drawImage(that.data.img, 0, 0, canvasW, canvasH) ctx.draw() wx.canvasToTempFilePath({ x: cutX, y: cutY, width: nowCutW, height: nowCutH, destWidth: nowCutW, destHeight: nowCutH, canvasId: cutImg, success: function(res) { var aa = res.tempFilePath that.setData({cutImgUrl:aa,prienFlag:false,alreay:false }) } }) },
红框根据手指移动方法
// 点击红框开始移动 canvasMove:function(e){ var that = this; var canvasW = that.data.canvasW; var canvasH = that.data.canvasH; var nowCutW = that.data.cutType?canvasW:that.data.nowCutW; var nowCutH = that.data.cutType?that.data.cutH:that.data.nowCutH var touches = e.touches[0]; var x = touches.x; var y = touches.y-(Number(nowCutH)/2); that.data.cutType?x=0:x=x-(Number(nowCutW)/2); that.setData({ cutX:x, cutY:y }) const ctx = wx.createCanvasContext(cutImg); ctx.setGlobalAlpha(0.4) ctx.drawImage(that.data.img, 0, 0, canvasW, canvasH) ctx.setFillStyle( ed) ctx.fillRect(x, y, nowCutW, nowCutH) ctx.draw() },
上方两个选择裁剪方式的按钮
等屏裁剪
//等屏裁剪 etcType:function(){ var that = this; var propor = 100; var canvasW = that.data.canvasW; var canvasH = that.data.canvasH; var cutH = that.data.cutH; var nowCutW = (Number(canvasW)*propor)/100 var nowCutH = (Number(cutH)*propor)/100 const ctx = wx.createCanvasContext(cutImg); ctx.setGlobalAlpha(0.4) ctx.drawImage(that.data.img, 0, 0, canvasW, canvasH) ctx.setFillStyle( ed) ctx.fillRect(0, 0, nowCutW, nowCutH) ctx.draw() that.setData({ nowCutW:nowCutW, nowCutH:nowCutH, cutType:true }) },
局域裁剪
areaType:function(){ var that = this; var propor = that.data.propor; var canvasW = that.data.canvasW; var canvasH = that.data.canvasH; var cutH = that.data.cutH; var nowCutW = (Number(canvasW)*propor)/100 var nowCutH = (Number(cutH)*propor)/100 const ctx = wx.createCanvasContext(cutImg); ctx.setGlobalAlpha(0.4) ctx.drawImage(that.data.img, 0, 0, canvasW, canvasH) ctx.setFillStyle( ed) ctx.fillRect(0,0, nowCutW, nowCutH) ctx.draw() that.setData({ nowCutW:nowCutW, nowCutH:nowCutH, cutType:false }) },
局域裁剪上方的滑动选择红框根据宽度等比例缩放
areaChange:function(e){ var that = this; var propor = e.detail.value; var canvasW = that.data.canvasW; var canvasH = that.data.canvasH; var cutH = that.data.cutH; var nowCutW = (Number(canvasW)*propor)/100 var nowCutH = (Number(cutH)*propor)/100 const ctx = wx.createCanvasContext(cutImg); ctx.setGlobalAlpha(0.4) ctx.drawImage(that.data.img, 0, 0, canvasW, canvasH) ctx.setFillStyle( ed) ctx.fillRect(that.data.cutX||0, that.data.cutY||0,nowCutW, nowCutH) ctx.draw() that.setData({ nowCutW:nowCutW, nowCutH:nowCutH, propor:propor }) },
重新裁剪回到初始选择图片的页面
// 重新裁剪 againBtn:function(){ var that = this; var data = that.data this.setData({ prienFlag:true, alreay:true }) const ctx = wx.createCanvasContext(cutImg); ctx.setGlobalAlpha(0.4) ctx.drawImage(data.img, 0, 0, data.canvasW, data.canvasH) ctx.setFillStyle( ed) ctx.fillRect(that.data.cutX||0, that.data.cutY||0, data.nowCutW||data.canvasW, data.nowCutH||data.cutH) ctx.draw() },
现在IOS还有个坑就是裁剪不了,官方正在修复不知道什么时候好
上面是我整理给大家的，希望今后会对大家有帮助。
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