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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';
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, nodeWidth:number, canvasWidth:number, handleSize:number):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', canvasWidth.toString());
this._canvas.setAttribute('height', canvasWidth.toString());
let canvasCtx = this._canvas.getContext('2d');
canvasCtx.clearRect(0, 0, this._canvas.width, this._canvas.height);
//Note: params below are: image, x to start drawing at, y to start drawing at, num of x pixels to draw, num of y pixels to draw
canvasCtx.drawImage(imageBase, 0, canvasWidth - nodeWidth, nodeWidth, nodeWidth); //Draw the node: When nodeWidth == canvasWidth, we'll start at point 0,0. Otherwise, x starts at 0 (but will end before end of canvas) and y starts low enough that node img ends at bottom of canvas.
canvasCtx.drawImage(imageLayer, canvasWidth - handleSize, 0, handleSize, handleSize); //Draw the icon: icon should be drawn in top right corner
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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