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module Sdc.Utils {
export class ImageCreatorService {
static '$inject' = ['$q'];
private _canvas: HTMLCanvasElement;
constructor(private $q: ng.IQService) {
this._canvas = <HTMLCanvasElement>$('<canvas>')[0];
this._canvas.setAttribute('style', 'display:none');
let body = document.getElementsByTagName('body')[0];
body.appendChild(this._canvas);
}
getImageBase64(imageBaseUri: string, imageLayerUri: string): ng.IPromise<string> {
let deferred = this.$q.defer();
let imageBase = new Image();
let imageLayer = new Image();
let imagesLoaded = 0;
let onImageLoaded = () => {
imagesLoaded++;
if (imagesLoaded < 2) {
return;
}
this._canvas.setAttribute('width', imageBase.width.toString());
this._canvas.setAttribute('height', imageBase.height.toString());
let canvasCtx = this._canvas.getContext('2d');
canvasCtx.clearRect(0, 0, this._canvas.width, this._canvas.height);
canvasCtx.drawImage(imageBase, 0, 0, imageBase.width, imageBase.height);
canvasCtx.drawImage(imageLayer, imageBase.width - imageLayer.width, 0, imageLayer.width, imageLayer.height);
let base64Image = this._canvas.toDataURL();
deferred.resolve(base64Image);
};
imageBase.onload = onImageLoaded;
imageLayer.onload = onImageLoaded;
imageBase.src = imageBaseUri;
imageLayer.src = imageLayerUri;
return deferred.promise;
}
}
}
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