ng-open-cv
Version:
Angular 6+ library integration for OpenCV.js
389 lines (383 loc) • 35.6 kB
JavaScript
import { Inject, Injectable, InjectionToken, NgModule, defineInjectable, inject } from '@angular/core';
import { BehaviorSubject, Observable } from 'rxjs';
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/** @type {?} */
const OPEN_CV_CONFIGURATION = new InjectionToken('Angular OpenCV Configuration Object');
class NgOpenCVService {
/**
* @param {?} options
*/
constructor(options) {
this.src = null;
this.dstC1 = null;
this.dstC3 = null;
this.dstC4 = null;
this.isReady = new BehaviorSubject({
ready: false,
error: false,
loading: true
});
this.isReady$ = this.isReady.asObservable();
this.OPENCV_URL = 'opencv.js';
this.DEFAULT_OPTIONS = {
scriptUrl: 'assets/opencv/asm/3.4/opencv.js',
wasmBinaryFile: 'wasm/3.4/opencv_js.wasm',
usingWasm: false,
locateFile: this.locateFile.bind(this),
onRuntimeInitialized: () => { }
};
this.setScriptUrl(options.scriptUrl);
/** @type {?} */
const opts = Object.assign({}, this.DEFAULT_OPTIONS, { options });
this.loadOpenCv(opts);
}
/**
* @param {?} path
* @param {?} scriptDirectory
* @return {?}
*/
locateFile(path, scriptDirectory) {
if (path === 'opencv_js.wasm') {
return scriptDirectory + '/wasm/' + path;
}
else {
return scriptDirectory + path;
}
}
/**
* @param {?} url
* @return {?}
*/
setScriptUrl(url) {
this.OPENCV_URL = url;
}
/**
* @param {?} options
* @return {?}
*/
loadOpenCv(options) {
this.isReady.next({
ready: false,
error: false,
loading: true
});
window['Module'] = Object.assign({}, options);
/** @type {?} */
const script = document.createElement('script');
script.setAttribute('async', '');
script.setAttribute('type', 'text/javascript');
script.addEventListener('load', () => {
/** @type {?} */
const onRuntimeInitializedCallback = () => {
if (options.onRuntimeInitialized) {
options.onRuntimeInitialized();
}
this.isReady.next({
ready: true,
error: false,
loading: false
});
};
cv.onRuntimeInitialized = onRuntimeInitializedCallback;
});
script.addEventListener('error', () => {
/** @type {?} */
const err = this.printError('Failed to load ' + this.OPENCV_URL);
this.isReady.next({
ready: false,
error: true,
loading: false
});
this.isReady.error(err);
});
script.src = this.OPENCV_URL;
/** @type {?} */
const node = document.getElementsByTagName('script')[0];
if (node) {
node.parentNode.insertBefore(script, node);
}
else {
document.head.appendChild(script);
}
}
/**
* @param {?} path
* @param {?} url
* @return {?}
*/
createFileFromUrl(path, url) {
/** @type {?} */
const request = new XMLHttpRequest();
request.open('GET', url, true);
request.responseType = 'arraybuffer';
return new Observable(observer => {
request.onload = ev => {
if (request.readyState === 4) {
if (request.status === 200) {
/** @type {?} */
const data = new Uint8Array(request.response);
cv.FS_createDataFile('/', path, data, true, false, false);
observer.next();
observer.complete();
}
else {
this.printError('Failed to load ' + url + ' status: ' + request.status);
observer.error();
}
}
};
request.send();
});
}
/**
* @param {?} imageUrl
* @param {?} canvasId
* @return {?}
*/
loadImageToCanvas(imageUrl, canvasId) {
return Observable.create(observer => {
/** @type {?} */
const canvas = /** @type {?} */ (document.getElementById(canvasId));
/** @type {?} */
const ctx = canvas.getContext('2d');
/** @type {?} */
const img = new Image();
img.crossOrigin = 'anonymous';
img.onload = () => {
canvas.width = img.width;
canvas.height = img.height;
ctx.drawImage(img, 0, 0, img.width, img.height);
observer.next();
observer.complete();
};
img.src = imageUrl;
});
}
/**
* @param {?} imageUrl
* @param {?} canvas
* @return {?}
*/
loadImageToHTMLCanvas(imageUrl, canvas) {
return Observable.create(observer => {
/** @type {?} */
const ctx = canvas.getContext('2d');
/** @type {?} */
const img = new Image();
img.crossOrigin = 'anonymous';
img.onload = () => {
canvas.width = img.width;
canvas.height = img.height;
ctx.drawImage(img, 0, 0, img.width, img.height);
observer.next();
observer.complete();
};
img.src = imageUrl;
});
}
/**
* @return {?}
*/
clearError() {
this.errorOutput.innerHTML = '';
}
/**
* @param {?} err
* @return {?}
*/
printError(err) {
if (typeof err === 'undefined') {
err = '';
}
else if (typeof err === 'number') {
if (!isNaN(err)) {
if (typeof cv !== 'undefined') {
err = 'Exception: ' + cv.exceptionFromPtr(err).msg;
}
}
}
else if (typeof err === 'string') {
/** @type {?} */
const ptr = Number(err.split(' ')[0]);
if (!isNaN(ptr)) {
if (typeof cv !== 'undefined') {
err = 'Exception: ' + cv.exceptionFromPtr(ptr).msg;
}
}
}
else if (err instanceof Error) {
err = err.stack.replace(/\n/g, '<br>');
}
throw new Error(err);
}
/**
* @param {?} scriptId
* @param {?} textAreaId
* @return {?}
*/
loadCode(scriptId, textAreaId) {
/** @type {?} */
const scriptNode = /** @type {?} */ (document.getElementById(scriptId));
/** @type {?} */
const textArea = /** @type {?} */ (document.getElementById(textAreaId));
if (scriptNode.type !== 'text/code-snippet') {
throw Error('Unknown code snippet type');
}
textArea.value = scriptNode.text.replace(/^\n/, '');
}
/**
* @param {?} fileInputId
* @param {?} canvasId
* @return {?}
*/
addFileInputHandler(fileInputId, canvasId) {
/** @type {?} */
const inputElement = document.getElementById(fileInputId);
inputElement.addEventListener('change', e => {
/** @type {?} */
const files = e.target['files'];
if (files.length > 0) {
/** @type {?} */
const imgUrl = URL.createObjectURL(files[0]);
this.loadImageToCanvas(imgUrl, canvasId);
}
}, false);
}
/**
* @return {?}
*/
onVideoCanPlay() {
if (this.onCameraStartedCallback) {
this.onCameraStartedCallback(this.stream, this.video);
}
}
/**
* @param {?} resolution
* @param {?} callback
* @param {?} videoId
* @return {?}
*/
startCamera(resolution, callback, videoId) {
/** @type {?} */
const constraints = {
qvga: { width: { exact: 320 }, height: { exact: 240 } },
vga: { width: { exact: 640 }, height: { exact: 480 } }
};
/** @type {?} */
let video = /** @type {?} */ (document.getElementById(videoId));
if (!video) {
video = document.createElement('video');
}
/** @type {?} */
let videoConstraint = constraints[resolution];
if (!videoConstraint) {
videoConstraint = true;
}
navigator.mediaDevices
.getUserMedia({ video: videoConstraint, audio: false })
.then(stream => {
video.srcObject = stream;
video.play();
this.video = video;
this.stream = stream;
this.onCameraStartedCallback = callback;
video.addEventListener('canplay', this.onVideoCanPlay.bind(this), false);
})
.catch(err => {
this.printError('Camera Error: ' + err.name + ' ' + err.message);
});
}
/**
* @return {?}
*/
stopCamera() {
if (this.video) {
this.video.pause();
this.video.srcObject = null;
this.video.removeEventListener('canplay', this.onVideoCanPlay.bind(this));
}
if (this.stream) {
this.stream.getVideoTracks()[0].stop();
}
}
/**
* @param {?} src
* @param {?} width
* @param {?} height
* @return {?}
*/
getContours(src, width, height) {
cv.cvtColor(src, this.dstC1, cv.COLOR_RGBA2GRAY);
cv.threshold(this.dstC1, this.dstC4, 120, 200, cv.THRESH_BINARY);
/** @type {?} */
const contours = new cv.MatVector();
/** @type {?} */
const hierarchy = new cv.Mat();
cv.findContours(this.dstC4, contours, hierarchy, cv.RETR_CCOMP, cv.CHAIN_APPROX_SIMPLE, {
x: 0,
y: 0
});
this.dstC3.delete();
this.dstC3 = cv.Mat.ones(height, width, cv.CV_8UC3);
for (let i = 0; i < contours.size(); ++i) {
/** @type {?} */
const color = new cv.Scalar(0, 255, 0);
cv.drawContours(this.dstC3, contours, i, color, 1, cv.LINE_8, hierarchy);
}
contours.delete();
hierarchy.delete();
return this.dstC3;
}
}
NgOpenCVService.decorators = [
{ type: Injectable, args: [{
providedIn: 'root'
},] }
];
/** @nocollapse */
NgOpenCVService.ctorParameters = () => [
{ type: undefined, decorators: [{ type: Inject, args: [OPEN_CV_CONFIGURATION,] }] }
];
/** @nocollapse */ NgOpenCVService.ngInjectableDef = defineInjectable({ factory: function NgOpenCVService_Factory() { return new NgOpenCVService(inject(OPEN_CV_CONFIGURATION)); }, token: NgOpenCVService, providedIn: "root" });
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
class NgOpenCVModule {
/**
*
* Setup the module in your application's root bootstrap.
*
*
* \@memberOf NgOpenCvModule
* @param {?} config
* @return {?}
*/
static forRoot(config) {
return {
ngModule: NgOpenCVModule,
providers: [{ provide: OPEN_CV_CONFIGURATION, useValue: config }]
};
}
}
NgOpenCVModule.decorators = [
{ type: NgModule, args: [{
imports: [],
declarations: [],
exports: [],
providers: [NgOpenCVService]
},] }
];
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
export { OPEN_CV_CONFIGURATION, NgOpenCVService, NgOpenCVModule };
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"file":"ng-open-cv.js.map","sources":["ng://ng-open-cv/lib/ng-open-cv.service.ts","ng://ng-open-cv/lib/ng-open-cv.module.ts"],"sourcesContent":["import { Inject, Injectable, InjectionToken } from '@angular/core';\nimport { BehaviorSubject, Observable } from 'rxjs';\n\nimport { OpenCVLoadResult, OpenCVOptions } from './ng-open-cv.models';\n\n/*\nAngular modifification of the OpenCV utils script found at https://docs.opencv.org/master/utils.js\n*/\ndeclare var cv: any;\n\nexport const OPEN_CV_CONFIGURATION = new InjectionToken<OpenCVOptions>('Angular OpenCV Configuration Object');\n\n@Injectable({\n  providedIn: 'root'\n})\nexport class NgOpenCVService {\n  errorOutput: HTMLElement;\n  src = null;\n  dstC1 = null;\n  dstC3 = null;\n  dstC4 = null;\n\n  stream: any;\n  video: any;\n  private isReady = new BehaviorSubject<OpenCVLoadResult>({\n    ready: false,\n    error: false,\n    loading: true\n  });\n  isReady$: Observable<OpenCVLoadResult> = this.isReady.asObservable();\n  onCameraStartedCallback: (a, b) => void;\n  OPENCV_URL = 'opencv.js';\n  DEFAULT_OPTIONS = {\n    scriptUrl: 'assets/opencv/asm/3.4/opencv.js',\n    wasmBinaryFile: 'wasm/3.4/opencv_js.wasm',\n    usingWasm: false,\n    locateFile: this.locateFile.bind(this),\n    onRuntimeInitialized: () => {}\n  };\n\n  constructor(@Inject(OPEN_CV_CONFIGURATION) options: OpenCVOptions) {\n    this.setScriptUrl(options.scriptUrl);\n    const opts = { ...this.DEFAULT_OPTIONS, options };\n    this.loadOpenCv(opts);\n  }\n\n  private locateFile(path, scriptDirectory): string {\n    if (path === 'opencv_js.wasm') {\n      return scriptDirectory + '/wasm/' + path;\n    } else {\n      return scriptDirectory + path;\n    }\n  }\n\n  setScriptUrl(url: string) {\n    this.OPENCV_URL = url;\n  }\n\n  loadOpenCv(options: OpenCVOptions) {\n    this.isReady.next({\n      ready: false,\n      error: false,\n      loading: true\n    });\n    window['Module'] = { ...options };\n    const script = document.createElement('script');\n    script.setAttribute('async', '');\n    script.setAttribute('type', 'text/javascript');\n    script.addEventListener('load', () => {\n      const onRuntimeInitializedCallback = () => {\n        if (options.onRuntimeInitialized) {\n          options.onRuntimeInitialized();\n        }\n        this.isReady.next({\n          ready: true,\n          error: false,\n          loading: false\n        });\n      };\n      cv.onRuntimeInitialized = onRuntimeInitializedCallback;\n    });\n    script.addEventListener('error', () => {\n      const err = this.printError('Failed to load ' + this.OPENCV_URL);\n      this.isReady.next({\n        ready: false,\n        error: true,\n        loading: false\n      });\n      this.isReady.error(err);\n    });\n    script.src = this.OPENCV_URL;\n    const node = document.getElementsByTagName('script')[0];\n    if (node) {\n      node.parentNode.insertBefore(script, node);\n    } else {\n      document.head.appendChild(script);\n    }\n  }\n\n  createFileFromUrl(path, url) {\n    const request = new XMLHttpRequest();\n    request.open('GET', url, true);\n    request.responseType = 'arraybuffer';\n    return new Observable(observer => {\n      const { next, error: catchError, complete } = observer;\n      request.onload = ev => {\n        if (request.readyState === 4) {\n          if (request.status === 200) {\n            const data = new Uint8Array(request.response);\n            cv.FS_createDataFile('/', path, data, true, false, false);\n            observer.next();\n            observer.complete();\n          } else {\n            this.printError('Failed to load ' + url + ' status: ' + request.status);\n            observer.error();\n          }\n        }\n      };\n      request.send();\n    });\n  }\n\n  loadImageToCanvas(imageUrl, canvasId: string): Observable<any> {\n    return Observable.create(observer => {\n      const canvas: HTMLCanvasElement = <HTMLCanvasElement>document.getElementById(canvasId);\n      const ctx = canvas.getContext('2d');\n      const img = new Image();\n      img.crossOrigin = 'anonymous';\n      img.onload = () => {\n        canvas.width = img.width;\n        canvas.height = img.height;\n        ctx.drawImage(img, 0, 0, img.width, img.height);\n        observer.next();\n        observer.complete();\n      };\n      img.src = imageUrl;\n    });\n  }\n\n  loadImageToHTMLCanvas(imageUrl: string, canvas: HTMLCanvasElement): Observable<any> {\n    return Observable.create(observer => {\n      const ctx = canvas.getContext('2d');\n      const img = new Image();\n      img.crossOrigin = 'anonymous';\n      img.onload = () => {\n        canvas.width = img.width;\n        canvas.height = img.height;\n        ctx.drawImage(img, 0, 0, img.width, img.height);\n        observer.next();\n        observer.complete();\n      };\n      img.src = imageUrl;\n    });\n  }\n\n  clearError() {\n    this.errorOutput.innerHTML = '';\n  }\n\n  printError(err) {\n    if (typeof err === 'undefined') {\n      err = '';\n    } else if (typeof err === 'number') {\n      if (!isNaN(err)) {\n        if (typeof cv !== 'undefined') {\n          err = 'Exception: ' + cv.exceptionFromPtr(err).msg;\n        }\n      }\n    } else if (typeof err === 'string') {\n      const ptr = Number(err.split(' ')[0]);\n      if (!isNaN(ptr)) {\n        if (typeof cv !== 'undefined') {\n          err = 'Exception: ' + cv.exceptionFromPtr(ptr).msg;\n        }\n      }\n    } else if (err instanceof Error) {\n      err = err.stack.replace(/\\n/g, '<br>');\n    }\n    throw new Error(err);\n  }\n\n  loadCode(scriptId, textAreaId) {\n    const scriptNode = <HTMLScriptElement>document.getElementById(scriptId);\n    const textArea = <HTMLTextAreaElement>document.getElementById(textAreaId);\n    if (scriptNode.type !== 'text/code-snippet') {\n      throw Error('Unknown code snippet type');\n    }\n    textArea.value = scriptNode.text.replace(/^\\n/, '');\n  }\n\n  addFileInputHandler(fileInputId, canvasId) {\n    const inputElement = document.getElementById(fileInputId);\n    inputElement.addEventListener(\n      'change',\n      e => {\n        const files = e.target['files'];\n        if (files.length > 0) {\n          const imgUrl = URL.createObjectURL(files[0]);\n          this.loadImageToCanvas(imgUrl, canvasId);\n        }\n      },\n      false\n    );\n  }\n\n  onVideoCanPlay() {\n    if (this.onCameraStartedCallback) {\n      this.onCameraStartedCallback(this.stream, this.video);\n    }\n  }\n\n  startCamera(resolution, callback, videoId) {\n    const constraints = {\n      qvga: { width: { exact: 320 }, height: { exact: 240 } },\n      vga: { width: { exact: 640 }, height: { exact: 480 } }\n    };\n    let video = <HTMLVideoElement>document.getElementById(videoId);\n    if (!video) {\n      video = document.createElement('video');\n    }\n\n    let videoConstraint = constraints[resolution];\n    if (!videoConstraint) {\n      videoConstraint = true;\n    }\n\n    navigator.mediaDevices\n      .getUserMedia({ video: videoConstraint, audio: false })\n      .then(stream => {\n        video.srcObject = stream;\n        video.play();\n        this.video = video;\n        this.stream = stream;\n        this.onCameraStartedCallback = callback;\n        video.addEventListener('canplay', this.onVideoCanPlay.bind(this), false);\n      })\n      .catch(err => {\n        this.printError('Camera Error: ' + err.name + ' ' + err.message);\n      });\n  }\n\n  stopCamera() {\n    if (this.video) {\n      this.video.pause();\n      this.video.srcObject = null;\n      this.video.removeEventListener('canplay', this.onVideoCanPlay.bind(this));\n    }\n    if (this.stream) {\n      this.stream.getVideoTracks()[0].stop();\n    }\n  }\n\n  getContours(src, width, height) {\n    cv.cvtColor(src, this.dstC1, cv.COLOR_RGBA2GRAY);\n    cv.threshold(this.dstC1, this.dstC4, 120, 200, cv.THRESH_BINARY);\n    const contours = new cv.MatVector();\n    const hierarchy = new cv.Mat();\n    cv.findContours(this.dstC4, contours, hierarchy, cv.RETR_CCOMP, cv.CHAIN_APPROX_SIMPLE, {\n      x: 0,\n      y: 0\n    });\n    this.dstC3.delete();\n    this.dstC3 = cv.Mat.ones(height, width, cv.CV_8UC3);\n    for (let i = 0; i < contours.size(); ++i) {\n      const color = new cv.Scalar(0, 255, 0);\n      cv.drawContours(this.dstC3, contours, i, color, 1, cv.LINE_8, hierarchy);\n    }\n    contours.delete();\n    hierarchy.delete();\n    return this.dstC3;\n  }\n}\n","import { NgModule, ModuleWithProviders } from '@angular/core';\nimport { NgOpenCVService, OPEN_CV_CONFIGURATION } from './ng-open-cv.service';\nimport { OpenCVOptions } from './ng-open-cv.models';\n\n@NgModule({\n  imports: [],\n  declarations: [],\n  exports: [],\n  providers: [NgOpenCVService]\n})\nexport class NgOpenCVModule {\n  /**\n   *\n   * Setup the module in your application's root bootstrap.\n   *\n   *\n   * @memberOf NgOpenCvModule\n   */\n  static forRoot(config: OpenCVOptions): ModuleWithProviders {\n    return {\n      ngModule: NgOpenCVModule,\n      providers: [{ provide: OPEN_CV_CONFIGURATION, useValue: config }]\n    };\n  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