ABPCMS.Web/lib/chart.js/test/jasmine.utils.js

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/* global __karma__ */

function loadJSON(url, callback) {
	var request = new XMLHttpRequest();
	request.onreadystatechange = function() {
		if (request.readyState === 4) {
			return callback(JSON.parse(request.responseText));
		}
	};

	request.overrideMimeType('application/json');
	request.open('GET', url, true);
	request.send(null);
}

function createCanvas(w, h) {
	var canvas = document.createElement('canvas');
	canvas.width = w;
	canvas.height = h;
	return canvas;
}

function readImageData(url, callback) {
	var image = new Image();

	image.onload = function() {
		var h = image.height;
		var w = image.width;
		var canvas = createCanvas(w, h);
		var ctx = canvas.getContext('2d');
		ctx.drawImage(image, 0, 0, w, h);
		callback(ctx.getImageData(0, 0, w, h));
	};

	image.src = url;
}

/**
 * Injects a new canvas (and div wrapper) and creates teh associated Chart instance
 * using the given config. Additional options allow tweaking elements generation.
 * @param {object} config - Chart config.
 * @param {object} options - Chart acquisition options.
 * @param {object} options.canvas - Canvas attributes.
 * @param {object} options.wrapper - Canvas wrapper attributes.
 * @param {boolean} options.persistent - If true, the chart will not be released after the spec.
 */
function acquireChart(config, options) {
	var wrapper = document.createElement('div');
	var canvas = document.createElement('canvas');
	var chart, key;

	config = config || {};
	options = options || {};
	options.canvas = options.canvas || {height: 512, width: 512};
	options.wrapper = options.wrapper || {class: 'chartjs-wrapper'};

	for (key in options.canvas) {
		if (options.canvas.hasOwnProperty(key)) {
			canvas.setAttribute(key, options.canvas[key]);
		}