/**
* @module photo-identification
* @description 拍照识别组件，通过拍照或选择相册图片进行OCR识别
* @property {boolean} takingPhotoIsEnd 拍照或从相册选择的后续过程是否结束
* @property {boolean} isCompressImage 图片是否压缩
* @fires handleOCR 处理OCR分发事件
*/
// 相机控件上下文
let cameraContext;
// 文件系统管理器
let fsm;
// 图片base64编码格式
let base64;
// 图片最大尺寸
const maxSize = 4 * 1024 * 1024;
Component({
options: {
addGlobalClass: true,
pureDataPattern: new RegExp('^_'),
},
properties: {
// 拍照过程是否结束
takingPhotoIsEnd: {
type: Boolean,
value: false,
},
// 是否压缩从拍摄或相册选择的图片
isCompressImage: {
type: Boolean,
value: true,
}
},
observers: {
'takingPhotoIsEnd': function(value) {
if (value) {
this.data._isTakingPhoto && this.setData({
_isTakingPhoto: false,
})
}
}
},
data: {
isSwitchOnLight: false,
_isTakingPhoto: false,
// 测试用
// pic: "",
},
lifetimes: {
ready() {
// 获取相机上下文
cameraContext = wx.createCameraContext && wx.createCameraContext();
// 获取文件系统管理器
fsm = wx.getFileSystemManager();
},
},
methods: {
// 切换灯开关
toggleSwitch() {
this.setData({
isSwitchOnLight: !this.data.isSwitchOnLight,
})
},
// 拍照
takePhoto() {
if (this.data._isTakingPhoto) return;
let self = this;
self.setData({
_isTakingPhoto: true
}, () => {
cameraContext.takePhoto({
quality: 'high',
success(res) {
console.log(res.tempImagePath);
// 测试用
// self.setData({
// pic: res.tempImagePath,
// })
self.next(res.tempImagePath, null, '');
},
error() {
self.data._isTakingPhoto && self.setData({
_isTakingPhoto: false,
})
}
});
})
},
// 选择相册
choosePhoto() {
let self = this;
wx.chooseImage({
count: 1,
sizeType: ['original'],
sourceType: ['album'],
success(res) {
let {
path,
size
} = res.tempFiles[0];
console.log(path, size);
// 测试用
// self.setData({
// pic: path,
// })
self.next(path, size, 'album');
},
})
},
// 压缩图片
_compressImage(path, size, cb) {
let self = this;
if (size) {
if (size > maxSize) {
wx.compressImage({
src: path,
quality: 80,
success(res) {
self._compressImage(res.tempFilePath, null, cb);
}
})
} else {
base64 = fsm.readFileSync(path, 'base64');
cb && cb(base64);
}
} else {
wx.getFileInfo({
filePath: path,
success(res) {
if (res.size > maxSize) {
wx.compressImage({
src: path,
quality: 80,
success(res) {
self._compressImage(res.tempFilePath, null, cb);
}
})
} else {
base64 = fsm.readFileSync(path, 'base64');
cb && cb(base64);
}
}
});
}
},
// 下一步处理
next(imgPath, imgSize, imgSource) {
if (this.data.isCompressImage) {
this._compressImage(imgPath, imgSize, (base64) => {
this.triggerEvent('handleOCR', {
base64,
imgSource,
})
});
} else {
base64 = fsm.readFileSync(imgPath, 'base64');
this.triggerEvent('handleOCR', {
base64,
imgSource,
})
}
},
}
})