怎么實現小程序圖片選擇區域裁剪-創新互聯
這篇文章給大家分享的是有關怎么實現小程序圖片選擇區域裁剪的內容。小編覺得挺實用的，因此分享給大家做個參考。一起跟隨小編過來看看吧。
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效果圖
HTML代碼
<view class="index_all_box">
<view class="imgCut_header">
<view class="imgCut_header_l" bindtap='okCutImg'>開始裁剪</view>
<view class="imgCut_header_m" bindtap='clickUpImg'>點擊上傳圖片</view>
<view class="imgCut_header_r" bindtap='okBtn'>點擊確認</view>
</view>
<!-- 選擇裁剪模式 -->
<view class="selectCutMode" wx:if='{{alreay}}'>
<view class="selectCutMode_in {{cutType?'selectCutMode_in_act':''}}" bindtap='etcType'>
等屏裁剪
</view>
<view class="selectCutMode_in {{!cutType?'selectCutMode_in_act':''}}" bindtap='areaType'>
區域裁剪
</view>
</view>
<view class="areaSelct_box" wx:if='{{!cutType && alreay}}'>
<slider bindchange="areaChange" min="50" max="100" show-value value='{{propor}}'/>
</view>
<view class="cutImg_box" wx:if='{{!prienFlag}}'>
<view class="cutImg_box_t">
<image src="{{cutImgUrl}}" mode='widthFix'></image>
</view>
<view class="clickCutImg_txt" bindtap='againBtn'>重新裁剪</view>
</view>
<view class="allCavans" wx:if='{{prienFlag}}' style='width: {{canvasW}}px;height: {{canvasH}}px' >
<canvas class='canvasSty' style='width: {{canvasW}}px;height: {{canvasH}}px' canvas-id='cutImg' disable-scroll='true' bindtouchmove='canvasMove'></canvas>
<view class="allCavans_inbg" style='width: {{canvasW}}px;height:{{canvasH}}px; background: url({{img}});background-size: 100% 100%'></view>
</view>
</view>CSS代碼
.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代碼部分
初始加載帶入上一個頁面帶過來的參數路徑
onLoad: function (options) {
var that = this;
const ctx = wx.createCanvasContext('cutImg');
ctx.setGlobalAlpha(0.4)
var aa = 'https://pintuanqu.oss-cn-hangzhou.aliyuncs.com/Uploads/Picture/goodsShow/20171201/5a2125fc86566.png'<br /> //獲取當前屏幕寬度
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('red')
ctx.fillRect(0, 0, phoneW, cutH)
ctx.draw()
that.setData({
canvasW:w,
canvasH:h,
img:aa,
cutH:cutH
})
}
})
},確定選擇區域開始裁剪
// 點擊確認裁剪圖片
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
})
}
})
},紅框根據手指移動方法
// 點擊紅框開始移動
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('red')
ctx.fillRect(x, y, nowCutW, nowCutH)
ctx.draw()
},上方兩個選擇裁剪方式的按鈕
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('red')
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('red')
ctx.fillRect(0,0, nowCutW, nowCutH)
ctx.draw()
that.setData({
nowCutW:nowCutW,
nowCutH:nowCutH,
cutType:false
})
},局域裁剪上方的滑動選擇紅框根據寬度等比例縮放
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('red')
ctx.fillRect(that.data.cutX||0, that.data.cutY||0,nowCutW, nowCutH)
ctx.draw()
that.setData({
nowCutW:nowCutW,
nowCutH:nowCutH,
propor:propor
})
},重新裁剪回到初始選擇圖片的頁面
// 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('red')
ctx.fillRect(that.data.cutX||0, that.data.cutY||0, data.nowCutW||data.canvasW, data.nowCutH||data.cutH)
ctx.draw()
},感謝各位的閱讀！關于怎么實現小程序圖片選擇區域裁剪就分享到這里了，希望以上內容可以對大家有一定的幫助，讓大家可以學到更多知識。如果覺得文章不錯，可以把它分享出去讓更多的人看到吧！
分享名稱：怎么實現小程序圖片選擇區域裁剪-創新互聯
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