ngx-opencv
Version:
Angular service for implementing the OpenCV library in angular based applications
110 lines • 12.7 kB
JavaScript
import { __decorate, __metadata, __param } from "tslib";
import { Inject, Injectable, InjectionToken, NgZone } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
import * as i0 from "@angular/core";
export var OpenCvConfigToken = new InjectionToken('OpenCV config object token');
var NgxOpenCVService = /** @class */ (function () {
function NgxOpenCVService(options, _ngZone) {
this._ngZone = _ngZone;
this.cvState = new BehaviorSubject({
ready: false,
error: false,
loading: true,
state: 'loading'
});
if (!options) {
options = {};
}
this.configModule = this.generateConfigModule(options);
this.loadOpenCv();
}
/**
* load the OpenCV script
*/
NgxOpenCVService.prototype.loadOpenCv = function () {
var _this = this;
this.cvState.next(this.newState('loading'));
// create global module variable
window['Module'] = this.configModule;
// create script element and set attributes
var script = document.createElement('script');
script.setAttribute('async', '');
script.setAttribute('type', 'text/javascript');
// listen for errors
script.addEventListener('error', function () {
var err = new Error('Failed to load ' + _this.configModule.scriptUrl);
_this.cvState.next(_this.newState('error'));
_this.cvState.error(err);
}, { passive: true });
// set script url
script.src = this.configModule.scriptUrl;
// insert script as first script tag
var node = document.getElementsByTagName('script')[0];
if (node) {
node.parentNode.insertBefore(script, node);
}
else {
document.head.appendChild(script);
}
};
/**
* generates a new state object
* @param change - the new state of the module
*/
NgxOpenCVService.prototype.newState = function (change) {
var newStateObj = {
ready: false,
loading: false,
error: false,
state: ''
};
Object.keys(newStateObj).forEach(function (key) {
if (key !== 'state') {
if (key === change) {
newStateObj[key] = true;
newStateObj.state = key;
}
else {
newStateObj[key] = false;
}
}
});
return newStateObj;
};
/**
* generates a config module for the global Module object
* @param options - configuration options
*/
NgxOpenCVService.prototype.generateConfigModule = function (options) {
var _this = this;
return {
scriptUrl: options.openCVDirPath ? options.openCVDirPath + "/opencv.js" : "/assets/opencv/opencv.js",
wasmBinaryFile: 'opencv_js.wasm',
usingWasm: true,
onRuntimeInitialized: function () {
_this._ngZone.run(function () {
console.log('openCV Ready');
_this.cvState.next(_this.newState('ready'));
if (options.runOnOpenCVInit) {
options.runOnOpenCVInit();
}
});
}
};
};
NgxOpenCVService.ctorParameters = function () { return [
{ type: undefined, decorators: [{ type: Inject, args: [OpenCvConfigToken,] }] },
{ type: NgZone }
]; };
NgxOpenCVService.ɵprov = i0.ɵɵdefineInjectable({ factory: function NgxOpenCVService_Factory() { return new NgxOpenCVService(i0.ɵɵinject(OpenCvConfigToken), i0.ɵɵinject(i0.NgZone)); }, token: NgxOpenCVService, providedIn: "root" });
NgxOpenCVService = __decorate([
Injectable({
providedIn: 'root'
}),
__param(0, Inject(OpenCvConfigToken)),
__metadata("design:paramtypes", [Object, NgZone])
], NgxOpenCVService);
return NgxOpenCVService;
}());
export { NgxOpenCVService };
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the new state of the module\r\n   */\r\n  private newState(change: 'loading'|'ready'|'error'): OpenCVState {\r\n    const newStateObj: OpenCVState = {\r\n      ready: false,\r\n      loading: false,\r\n      error: false,\r\n      state: ''\r\n    };\r\n    Object.keys(newStateObj).forEach(key => {\r\n      if (key !== 'state') {\r\n        if (key === change) {\r\n          newStateObj[key] = true;\r\n          newStateObj.state = key;\r\n        } else {\r\n          newStateObj[key] = false;\r\n        }\r\n      }\r\n    });\r\n    return newStateObj;\r\n  }\r\n\r\n  /**\r\n   * generates a config module for the global Module object\r\n   * @param options - configuration options\r\n   */\r\n  private generateConfigModule(options: OpenCVConfig): OpenCvConfigModule {\r\n    return {\r\n      scriptUrl: options.openCVDirPath ? `${options.openCVDirPath}/opencv.js` : `/assets/opencv/opencv.js`,\r\n      wasmBinaryFile: 'opencv_js.wasm',\r\n      usingWasm: true,\r\n      onRuntimeInitialized: () => {\r\n        this._ngZone.run(() => {\r\n          console.log('openCV Ready');\r\n          this.cvState.next(this.newState('ready'));\r\n          if (options.runOnOpenCVInit) {\r\n            options.runOnOpenCVInit();\r\n          }\r\n        });\r\n      }\r\n    };\r\n  }\r\n}\r\n\r\n/**\r\n * describes the global Module object that is used to initiate OpenCV.js\r\n */\r\ninterface OpenCvConfigModule {\r\n  scriptUrl: string;\r\n  wasmBinaryFile: string;\r\n  usingWasm: boolean;\r\n  onRuntimeInitialized: Function;\r\n}\r\n\r\n"]}