Huanyuyuehui/uni_modules/bt-cropper/components/bt-cropper/bt-cropper.vue

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<template>
<view class="bt-container">
<!-- <view class="iconfont icon-reset" @click.stop="resetImage"></view> -->
<view @touchend="onTouchEnd" @touchstart="onTouchStart" class="mainContent">
<template v-if="imageInfo">
<image :src="showImagePath" mode="aspectFit" data-type="image" @touchmove.stop.prevent="onImageMove"
:style="[imageStyle]" class="image"></image>
<view class="cropper" :style="{
width: cropperPosition.width + 'px',
height: cropperPosition.height + 'px',
left: cropperPosition.left - 1 + 'px',
top: cropperPosition.top - 1 + 'px',
transition,
}">
<template v-if="showGrid">
<view class="line row row1"></view>
<view class="line row row2"></view>
<view class="line col col1"></view>
<view class="line col col2"></view>
</template>
</view>
<view @touchmove.stop.prevent="onHandleResize(-1, 0, $event)" class="controller vertical"
:style="[controllerPosition.left]" />
<view @touchmove.stop.prevent="onHandleResize(1, 0, $event)" class="controller vertical"
:style="[controllerPosition.right]" />
<view @touchmove.stop.prevent="onHandleResize(0, -1, $event)" class="controller horizon"
:style="[controllerPosition.top]" />
<view @touchmove.stop.prevent="onHandleResize(0, 1, $event)" class="controller horizon"
:style="[controllerPosition.bottom]" />
<template v-if="ratio==0">
<view @touchmove.stop.prevent="onHandleResize(-1, -1, $event)" class="controller controller_dot"
:style="[controllerPosition.leftTop]" />
<view @touchmove.stop.prevent="onHandleResize(1, -1, $event)" class="controller controller_dot"
:style="[controllerPosition.rightTop]" />
<view @touchmove.stop.prevent="onHandleResize(-1, 1, $event)" class="controller controller_dot"
:style="[controllerPosition.leftBottom]" />
<view @touchmove.stop.prevent="onHandleResize(1, 1, $event)" class="controller controller_dot"
:style="[controllerPosition.rightBottom]" />
</template>
</template>
</view>
<view class="slot">
<slot />
</view>
<!-- #ifdef MP-WEIXIN -->
<canvas v-if="showCanvas" type="2d" class="bt-canvas" :style="{
width:dSize.width+'px',
height:dSize.height+'px'
}"></canvas>
<!-- #endif -->
<!-- #ifndef MP-WEIXIN -->
<canvas v-if="showCanvas" canvas-id="bt-canvas" class="bt-canvas" :style="{
width:dSize.width+'px',
height:dSize.height+'px'
}"></canvas>
<!-- #endif -->
</view>
</template>
<script>
/**
* better-cropper 图片裁切插件
*/
import calcImageSize from "./utils/calcImageSize.js"
import calcImagePosition from "./utils/calcImagePosition.js"
import calcCropper from "./utils/calcCropper.js"
import calcRightAndBottom from "./utils/calcRightAndBottom.js"
import calcPointDistance from "./utils/calcPointDistance.js"
import {
getTouchPoints,
sleep,
debounce,
log
} from "./utils/tools.js"
var startOffsetX = 0,
startOffsetY = 0,
startTouchsDistance = 0,
startChangeLeft = 0,
startChangeTop = 0,
startChangeWidth = 0,
startChangeHeight = 0,
initScale = 1,
startTouches = [],
timer = null;
export default {
name: "bt-cropper",
props: {
// 图片路径,支持网络路径和本地路径
imageSrc: {
type: String,
default: "",
required: true
// validator(value) {
// if (/^(http:|https:|)\/\//.test(value)) {
// return true
// } else {
// console.warn("图片url似乎不合法")
// return false
// }
// }
},
// 输出图片的格式默认jpg
fileType: {
type: String,
default: "jpg"
},
// 生成的图片的宽度
dWidth: {
type: Number,
default: 0
},
// 裁切比例0表示自由
ratio: {
type: Number,
default: 0,
validator(value) {
if (typeof value === 'number') {
if (value < 0) {
log('裁剪框比例值必须大于零', 'error')
return false
}
} else {
log('裁剪框比例值必须是数字', 'error')
return false
}
return true
}
},
// 是否展示网格
showGrid: {
type: Boolean,
default: false
},
// 图片质量0-1 越大质量越好
quality: {
type: Number,
default: 1
},
// 初始的图片位置
initPosition: {
type: Object,
default () {
return null
}
},
// 是否压缩图片
// 注意:这里的压缩指的是用户移动图片展示的那个图片的压缩,
// 输出图片的质量并不会受到影响,
// 也就是说,最终输出图片的质量会比裁切时看起来更好
compress: {
type: Boolean,
default: false
},
// 是否开启操作结束后自动放大
autoZoom:{
type:Boolean,
default:true
}
},
data() {
return {
imageUrl: "",
imageInfo: null,
containerRect: "",
offsetX: 0,
offsetY: 0,
changeWidth: 0,
changeHeight: 0,
windowWidth: 375,
dpr: 2,
forceChangeWidth: 0,
forceChangeHeight: 0,
animate: false,
imgScale: 1,
imgTranslateX: 0,
imgTranslateY: 0,
// 这个变量不要删掉不然会造成性能严重下降这是uni-app框架的Bug
showCanvas: false,
cropperPosition: {
left: 0,
top: 0,
width: 0,
height: 0
},
// 图片在视图上的位置
imageBoundingRect: {
left: 0,
top: 0,
width: 0,
height: 0,
}
};
},
watch: {
imageSrc: {
handler(imageSrc) {
this.imageUrl = imageSrc
this.imageInfo = null;
if(!imageSrc){
return
}
this.getImageInfo(imageSrc).then(imageInfo => {
this.imageInfo = imageInfo;
return this.getContainerRect()
}).then(rect => {
this.containerRect = rect;
this.imageBoundingRect = this.getImageInitRect()
this.resetImage()
if (this.ratio == 0) {
this.cropperPosition = this.getCropperInitPosition()
}
return this.imageBoundingRect;
}).then((imageBoundingRect) => {
if (this.initPosition) {
const {left,top,width,height} = this.initPosition
const ratio = this.imageBoundingRect.width / this.imageInfo.width
if(left!==undefined){
const imgTranslateX = this.cropperPosition.left - imageBoundingRect.left - left * ratio
this.cropperPosition.left -= imgTranslateX
}
if(top!==undefined){
const imgTranslateY = this.cropperPosition.top - imageBoundingRect.top - top * ratio
this.cropperPosition.top -= imgTranslateY
}
!!width && (this.cropperPosition.width = this.initPosition.width * ratio);
!!height && (this.cropperPosition.height = this.initPosition.height * ratio);
}
this.$emit('load')
}).catch(err=>{
console.error('失败信息',err)
this.$emit('loadFail',err)
})
},
immediate: true
},
ratio: {
handler(ratio) {
this.resetCropper()
this.applyAnim()
},
immediate: false
},
},
computed: {
showImagePath() {
if (this.imageInfo && this.imageInfo.compressPath) {
return this.imageInfo.compressPath
} else {
return this.imageInfo?.path || ""
}
},
// 生成图片的大小
dSize() {
if (this.dWidth > 0) {
return {
width: this.dWidth,
height: this.dWidth * (this.cropperPosition.height / this.cropperPosition.width)
}
} else {
// 原像素比例裁剪
let scale = 1
if (this.imageInfo) {
scale = this.imgScale * this.imageBoundingRect.width / this.imageInfo.width
}
return {
width: this.cropperPosition.width / scale,
height: this.cropperPosition.height / scale
}
}
},
imageStyle() {
let style = {
left: this.imageBoundingRect.left + 'px',
top: this.imageBoundingRect.top + 'px',
width: this.imageBoundingRect.width + 'px',
height: this.imageBoundingRect.height + 'px',
transition: this.transition,
transform: `matrix(${this.imgScale}, 0, 0, ${this.imgScale}, ${this.imgTranslateX}, ${this.imgTranslateY}) translateZ(0px)`,
}
return style
},
transition() {
return this.animate ? '0.2s' : 'none'
},
// 四个控制点的位置
controllerPosition() {
const up40 = uni.upx2px(40),
up30 = uni.upx2px(30),
up20 = uni.upx2px(20);
const transition = this.transition
return {
left: {
left: this.cropperPosition.left - up30 + 'px',
top: this.cropperPosition.top + (this.cropperPosition.height) / 2 - up40 + 'px',
transition
},
right: {
left: this.cropperPosition.left + this.cropperPosition.width - up20 + 'px',
top: this.cropperPosition.top + (this.cropperPosition.height) / 2 - up40 + 'px',
transition
},
top: {
left: this.cropperPosition.left + this.cropperPosition.width / 2 - up40 + 'px',
top: this.cropperPosition.top - up30 + 'px',
transition
},
bottom: {
left: this.cropperPosition.left + this.cropperPosition.width / 2 - up40 + 'px',
top: this.cropperPosition.top + this.cropperPosition.height - up20 + 'px',
transition
},
leftTop: {
left: this.cropperPosition.left - up40 + 'px',
top: this.cropperPosition.top - up40 + 'px',
transition
},
rightTop: {
left: this.cropperPosition.left + this.cropperPosition.width - up40 + 'px',
top: this.cropperPosition.top - up40 + 'px',
transition
},
leftBottom: {
left: this.cropperPosition.left - up40 + 'px',
top: this.cropperPosition.top + this.cropperPosition.height - up40 + 'px',
transition
},
rightBottom: {
left: this.cropperPosition.left + this.cropperPosition.width - up40 + 'px',
top: this.cropperPosition.top + this.cropperPosition.height - up40 + 'px',
transition
}
}
},
},
methods: {
// 开启动画
applyAnim() {
this.animate = true
clearTimeout(timer)
timer = setTimeout(() => {
this.animate = false
}, 200)
},
async getContainerRect() {
const systemInfo = uni.getSystemInfoSync()
this.windowWidth = systemInfo.windowWidth
this.dpr = systemInfo.pixelRatio
return new Promise(resolve => {
uni.createSelectorQuery().in(this).select(".mainContent").boundingClientRect((rect) => {
resolve(rect)
}).exec()
})
},
async getImageInfo(imageSrc) {
uni.showLoading({
title: "获取图片信息"
})
return uni.getImageInfo({
src: imageSrc
}).then((res) => {
let imageInfo = null;
// #ifdef VUE2
const err = res[0];
imageInfo = res[1];
if (err) {
throw new Error(err)
}
// #endif
// #ifdef VUE3
imageInfo = res
// #endif
uni.hideLoading()
return imageInfo;
}).then(imageInfo => {
const maxSize = 2000 * 2000
const imageSize = imageInfo.width * imageInfo.height
// uni.canIUse('compressImage.success.tempFilePath')
// #ifndef H5
// 是否压缩图片
if (maxSize < imageSize && this.compress) {
const quality = maxSize / imageSize * 100
return uni.compressImage({
src: imageInfo.path,
quality
}).then(([err, {
tempFilePath
}]) => {
if (!err) {
imageInfo.compressPath = tempFilePath
}
return imageInfo
})
}
// #endif
return imageInfo;
}).then(imageInfo => {
return imageInfo;
}).catch(err => {
uni.hideLoading()
uni.showToast({
title: "图片加载失败",
icon: "none"
})
throw Error(err)
})
},
getImageInitRect() {
return calcImageSize(this.imageInfo, this.containerRect)
},
resetImage() {
this.imgTranslateX = 0
this.imgTranslateY = 0
this.imgScale = 1
this.resetCropper()
},
// 获取裁剪框初始位置
getCropperInitPosition() {
return calcCropper(this.imageBoundingRect, {
width: this.ratio || 1,
height: 1
})
},
/**
* @deprecated 本方法已弃用请用resetCropper代替
*/
resetRatio(){
log('本方法(resetRatio)已弃用,未来将删除,请用resetCropper代替','warn')
return this.resetCropper()
},
// 重置裁剪框
resetCropper() {
if (this.imageInfo && this.ratio !== 0) {
this.cropperPosition = this.getCropperInitPosition()
this.checkImagePosition()
}
},
onTouchStart(ev) {
this.animate = false
if (timer) {
clearTimeout(timer)
}
startTouches = Array.from(ev.touches)
if (ev.target.dataset.type === 'image') {
startOffsetX = this.imgTranslateX;
startOffsetY = this.imgTranslateY;
if (ev.touches.length == 2) {
initScale = this.imgScale
startTouchsDistance = calcPointDistance(...getTouchPoints(startTouches))
}
} else {
startChangeLeft = this.cropperPosition.left
startChangeTop = this.cropperPosition.top
startChangeWidth = this.cropperPosition.width;
startChangeHeight = this.cropperPosition.height;
}
},
onTouchEnd() {
startTouches = []
this.checkImagePosition()
if(this.autoZoom){
clearTimeout(timer)
timer = setTimeout(this.zoom,1000)
}
this.reportChange()
},
getImagePosition() {
return calcImagePosition(this.imageBoundingRect, {
imgTranslateX: this.imgTranslateX,
imgTranslateY: this.imgTranslateY,
imgScale: this.imgScale
})
},
getCropperPosition() {
return calcRightAndBottom(this.cropperPosition)
},
// 检查图片位置
checkImagePosition() {
const imagePosition = this.getImagePosition()
const cropperPosition = this.getCropperPosition()
// 如果裁剪框大于图像大小,就放大到裁剪框大小
const widthScale = cropperPosition.width / imagePosition.width
const heightScale = cropperPosition.height / imagePosition.height
const scale = Math.max(widthScale, heightScale)
if (scale > 1) {
this.imageZoom({
left: cropperPosition.left + cropperPosition.width / 2,
top: cropperPosition.top + cropperPosition.height / 2
}, scale)
this.applyAnim()
}
// 判断是否超出边界
if (imagePosition.left > cropperPosition.left) {
this.imgTranslateX = this.imgTranslateX - (imagePosition.left - cropperPosition.left)
} else if (imagePosition.right < cropperPosition.right) {
this.imgTranslateX = this.imgTranslateX + (cropperPosition.right - imagePosition.right)
}
if (imagePosition.top > cropperPosition.top) {
this.imgTranslateY = this.imgTranslateY - (imagePosition.top - cropperPosition.top)
} else if (imagePosition.bottom < cropperPosition.bottom) {
this.imgTranslateY = this.imgTranslateY + (cropperPosition.bottom - imagePosition.bottom)
}
},
zoom(){
// 容器比例
const containerRatio = this.containerRect.width / this.containerRect.height
// 移动后的裁剪框比例
const cropperRatio = this.cropperPosition.width / this.cropperPosition.height
// 放大比例
let scale = 1
if (cropperRatio > containerRatio) {
scale = this.containerRect.width / this.cropperPosition.width
} else {
scale = this.containerRect.height / this.cropperPosition.height
}
// 放大裁剪框
this.cropperPosition.width *= scale
this.cropperPosition.height *= scale
// // 移动图像
this.imageZoom({
left: this.cropperPosition.left,
top: this.cropperPosition.top
}, scale)
// 将裁剪框上下居中
const cropperTop = (this.containerRect.height - this.cropperPosition.height) / 2
// 需要上下移动的距离
const moveTop = cropperTop - this.cropperPosition.top
// 将裁剪框左右居中
const cropperLeft = (this.containerRect.width - this.cropperPosition.width) / 2
// 需要左右移动的距离
const moveLeft = (cropperLeft - this.cropperPosition.left)
this.cropperPosition.left = cropperLeft
this.cropperPosition.top = cropperTop
// 移动图像使之与裁剪框对齐
this.imgTranslateX += moveLeft
this.imgTranslateY += moveTop
this.checkImagePosition()
this.applyAnim()
},
// 发送change事件
reportChange() {
const imagePosition = this.getImagePosition()
const cropperPosition = this.getCropperPosition()
const scale = this.imageBoundingRect.width/this.imageInfo.width * this.imgScale
this.$emit('change', {
left: (cropperPosition.left - imagePosition.left) / scale,
top: (cropperPosition.top - imagePosition.top) / scale,
width: cropperPosition.width / scale,
height: cropperPosition.height / scale
})
},
imageZoom(center = {
left: 0,
top: 0
}, scale = 1) {
const imagePosition = this.getImagePosition()
this.imgScale = this.imgScale * scale
const offsetLeftPercent = (center.left - imagePosition.left) / imagePosition.width
this.imgTranslateX = this.imgTranslateX + imagePosition.width * (scale - 1) / 2 * (1 - offsetLeftPercent *
2)
const offsetTopPercent = (center.top - imagePosition.top) / imagePosition.height
this.imgTranslateY = this.imgTranslateY + imagePosition.height * (scale - 1) / 2 * (1 - offsetTopPercent *
2)
},
onImageMove(ev) {
if (ev.touches.length == 2 && startTouches.length == 2) {
const points = getTouchPoints(ev.touches)
const imgScale = initScale * calcPointDistance(...points) / startTouchsDistance
this.imageZoom({
left: this.cropperPosition.left + this.cropperPosition.width / 2,
top: this.cropperPosition.top + this.cropperPosition.height / 2
}, imgScale / this.imgScale)
} else if (ev.touches.length == 1 && startTouches.length == 1) {
const [startClientX, startClientY] = getTouchPoints(startTouches)[0]
const [clientX, clientY] = getTouchPoints(ev.touches)[0]
this.imgTranslateX = startOffsetX + clientX - startClientX
this.imgTranslateY = startOffsetY + clientY - startClientY
}
},
// 调整裁剪框大小
onHandleResize(pX, pY, ev) {
const [startClientX, startClientY] = getTouchPoints(startTouches)[0]
const [clientX, clientY] = getTouchPoints(ev.touches)[0]
const cropperBoundingRect = this.getCropperPosition()
const imageBoundingRect = this.getImagePosition()
const changeX = clientX - startClientX
const changeY = clientY - startClientY
const minSize = {
width: uni.upx2px(100),
height: uni.upx2px(100)
}
const imageRemainHeight = imageBoundingRect.bottom - cropperBoundingRect.top
const cropperRemainHeight = this.containerRect.bottom - cropperBoundingRect.top
const maxHeight = Math.min(imageRemainHeight, cropperRemainHeight)
const imageRemainWidth = imageBoundingRect.right - cropperBoundingRect.left
const cropperRemainWidth = this.containerRect.right - cropperBoundingRect.left
const maxWidth = Math.min(imageRemainWidth, cropperRemainWidth)
let width = 0
switch (pX) {
case 1:
width = startChangeWidth + changeX
if (width < maxWidth) {
if (width > minSize.width) {
this.cropperPosition.width = width
}
}
break;
case -1:
const left = startChangeLeft + changeX
const minLeft = Math.min(imageBoundingRect.left, cropperBoundingRect.left)
width = startChangeWidth - changeX
if (left > minLeft) {
if (width > minSize.width) {
this.cropperPosition.left = left
this.cropperPosition.width = width
}
}
break;
case 0:
if (this.ratio != 0)
this.cropperPosition.width = this.cropperPosition.height * this.ratio
break
}
switch (pY) {
case 1:
const height = startChangeHeight + changeY
if (height < maxHeight && height > minSize.height) {
this.cropperPosition.height = height
}
break;
case -1:
const top = startChangeTop + changeY
const minTop = Math.min(imageBoundingRect.top, cropperBoundingRect.top)
if (top > minTop) {
const height = startChangeHeight - changeY
if (height > minSize.height) {
this.cropperPosition.top = top
this.cropperPosition.height = height
}
}
break;
case 0:
if (this.ratio != 0)
this.cropperPosition.height = this.cropperPosition.width / this.ratio;
break;
}
},
// 开始裁剪
async crop(images = null) {
// 批量裁剪,暂时还没实现
// if (Array.isArray(images) && images.length) {
// for (item in images) {
// }
// return;
// }
if (!this.imageInfo) {
uni.showToast({
title: "图片尚未载入完成"
})
return [new Error("图片尚未载入完成"), null]
}
this.showCanvas = true
this.$emit('cropStart')
return new Promise(resolve => {
this.$nextTick(() => {
this.onCrop().then(res => {
resolve(res)
})
})
})
},
// 开始裁切
async onCrop() {
let canvas, image, ctx, err, res;
// 新版canvas
// #ifdef MP-WEIXIN
canvas = await new Promise((resolve) => {
uni
.createSelectorQuery().in(this)
.select(".bt-canvas")
.node((res) => {
resolve(res.node);
})
.exec();
});
log("在小程序模拟器上可能会裁剪失败,真机无此问题,放心使用", "warn")
image = canvas.createImage();
image.src = this.imageInfo.path;
await new Promise((resolve) => (image.onload = resolve));
canvas.width = this.dSize.width;
canvas.height = this.dSize.height;
ctx = canvas.getContext("2d");
// #endif
// #ifndef MP-WEIXIN
image = this.imageInfo.path
ctx = uni.createCanvasContext("bt-canvas", this)
// #endif
const imagePosition = this.getImagePosition()
const cropperPosition = this.getCropperPosition()
const scale = imagePosition.width / this.imageInfo.width
const offsetLeft = (cropperPosition.left - imagePosition.left) / scale
const offsetTop = (cropperPosition.top - imagePosition.top) / scale
const cropperWidth = cropperPosition.width / scale
const cropperHeight = cropperPosition.height / scale
// console.log('offsetLeft', offsetLeft, 'offsetTop', offsetTop, this.imageInfo)
ctx.drawImage(
image,
offsetLeft,
offsetTop,
cropperWidth,
cropperHeight,
0,
0,
this.dSize.width,
this.dSize.height
);
// #ifndef MP-WEIXIN
await new Promise((resolve) => ctx.draw(true, resolve));
// #endif
// 等待一段时间不然ios会裁剪失败
await sleep(200);
// 在vue3里面只能写成这种回调形式否则报错
[err, res] = await new Promise(resolve => {
uni.canvasToTempFilePath({
// #ifdef MP-WEIXIN
canvas,
// #endif
// #ifndef MP-WEIXIN
canvasId: "bt-canvas",
// #endif
fileType: this.fileType,
destWidth: this.dSize.width,
destHeight: this.dSize.height,
quality: this.quality,
success(res) {
console.log("裁剪成功")
resolve([null, res])
},
fail(err) {
console.log("裁剪失败", err)
resolve([err, null])
},
complete: () => {
this.showCanvas = false
}
});
})
this.$emit('cropEnd', [err, res])
return [err, res]
},
},
};
</script>
<style lang="scss" scoped>
@import "./iconfont.css";
.bt-container {
display: flex;
flex-direction: column;
justify-content: space-between;
height: 100%;
box-sizing: border-box;
background-color: #0e1319;
padding-top: 30rpx;
position: relative;
overflow: hidden;
.iconfont {
position: absolute;
z-index: 999;
top: 40rpx;
font-size: 30rpx;
padding: 10rpx;
background-color: rgba(255, 255, 255, 0.2);
border-radius: 50%;
color: #FFFFFF;
&.active {
color: #007AFF;
}
}
.icon-move {
right: 100rpx;
}
.icon-reset {
right: 40rpx;
}
.bt-canvas {
position: absolute;
left: 100%;
top: 0;
width: 300px;
height: 300px;
}
.mainContent {
flex: 1;
margin: 60rpx 60rpx 150rpx;
position: relative;
.image {
position: absolute;
will-change: transform;
transform-origin: center center;
}
.controller {
position: absolute;
z-index: 99;
padding: 20rpx;
&::after {
display: block;
content: '';
box-shadow: 0 0 10rpx #333;
background-color: #E4E7ED;
}
&.controller_dot {
&::after {
width: 40rpx;
height: 40rpx;
border-radius: 99px;
}
}
&.vertical {
&::after {
width: 10rpx;
height: 40rpx;
}
}
&.horizon {
&::after {
width: 40rpx;
height: 10rpx;
}
}
}
.cropper {
position: absolute;
border: 1px solid #eee;
box-sizing: content-box;
transform-origin: center center;
outline: 999px solid rgba(0, 0, 0, 0.5);
will-change: transform;
display: contain;
pointer-events: none;
.line {
position: absolute;
// background-color: #eee;
}
.row {
width: 100%;
height: 0px;
left: 0;
border-top: 1px dashed #007AFF;
}
.col {
height: 100%;
width: 0px;
border-left: 1px dashed #007AFF;
}
.row1 {
top: 33%;
}
.row2 {
top: 66%;
}
.col1 {
left: 33%;
}
.col2 {
left: 66%;
}
}
}
.slot {
position: fixed;
width: 100%;
left: 0;
bottom: 0;
height: 90rpx;
height: calc(90rpx+ constant(safe-area-inset-bottom)); ///兼容 IOS<11.2/
height: calc(90rpx + env(safe-area-inset-bottom)); ///兼容 IOS>11.2/
}
}
</style>