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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
'use strict';
import {Injectable} from "@angular/core";
export interface ICanvasImage {
src: string;
width: number
height: number;
x: number;
y: number;
}
@Injectable()
export class ImageCreatorService {
private _canvas:HTMLCanvasElement;
constructor() {
this._canvas = <HTMLCanvasElement>$('<canvas>')[0];
this._canvas.setAttribute('style', 'display:none');
let body = document.getElementsByTagName('body')[0];
body.appendChild(this._canvas);
}
/**
* Create an image composed of different image layers
* @param canvasImages
* @param canvasWidth
* @param canvasHeight
* returns a PROMISE
*/
getMultiLayerBase64Image(canvasImages: ICanvasImage[], canvasWidth?:number, canvasHeight?:number):Promise<string> {
var promise = new Promise<string>((resolve, reject) => {
if(canvasImages && canvasImages.length === 0){
return null;
}
//If only width was set, use it for height, otherwise use first canvasImage height
canvasHeight = canvasHeight || canvasImages[0].height;
canvasWidth = canvasWidth || canvasImages[0].width;
const images = [];
let imagesLoaded = 0;
const onImageLoaded = () => {
imagesLoaded++;
if(imagesLoaded < canvasImages.length){
return;
}
this._canvas.setAttribute('width', (canvasWidth * 4).toString());
this._canvas.setAttribute('height', (canvasHeight * 4).toString());
const canvasCtx = this._canvas.getContext('2d');
canvasCtx.scale(4,4);
canvasCtx.clearRect(0, 0, this._canvas.width, this._canvas.height);
images.forEach((image, index) => {
const canvasImage = canvasImages[index];
canvasCtx.drawImage(image, canvasImage.x, canvasImage.y, canvasImage.width, canvasImage.height);
});
let base64Image = this._canvas.toDataURL();
resolve(base64Image)
};
canvasImages.forEach(canvasImage => {
let image = new Image();
image.onload = onImageLoaded;
image.src = canvasImage.src;
images.push(image);
});
});
return promise;
}
}
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