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

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'use strict';

var pixelmatch = require('pixelmatch');
var utils = require('./jasmine.utils');

function toPercent(value) {
	return Math.round(value * 10000) / 100;
}

function createImageData(w, h) {
	var canvas = utils.createCanvas(w, h);
	var context = canvas.getContext('2d');
	return context.getImageData(0, 0, w, h);
}

function canvasFromImageData(data) {
	var canvas = utils.createCanvas(data.width, data.height);
	var context = canvas.getContext('2d');
	context.putImageData(data, 0, 0);
	return canvas;
}

function buildPixelMatchPreview(actual, expected, diff, threshold, tolerance, count) {
	var ratio = count / (actual.width * actual.height);
	var wrapper = document.createElement('div');

	wrapper.style.cssText = 'display: flex; overflow-y: auto';

	[
		{data: actual, label: 'Actual'},
		{data: expected, label: 'Expected'},
		{data: diff, label:
			'diff: ' + count + 'px ' +
			'(' + toPercent(ratio) + '%)<br/>' +
			'thr: ' + toPercent(threshold) + '%, ' +
			'tol: '+ toPercent(tolerance) + '%'
		}
	].forEach(function(values) {
		var item = document.createElement('div');
		item.style.cssText = 'text-align: center; font: 12px monospace; line-height: 1.4; margin: 8px';
		item.innerHTML = '<div style="margin: 8px; height: 32px">' + values.label + '</div>';
		item.appendChild(canvasFromImageData(values.data));
		wrapper.appendChild(item);
	});

	// WORKAROUND: https://github.com/karma-runner/karma-jasmine/issues/139
	wrapper.indexOf = function() {
		return -1;
	};

	return wrapper;
}

function toBeCloseToPixel() {
	return {
		compare: function(actual, expected) {
			var result = false;

			if (!isNaN(actual) && !isNaN(expected)) {
				var diff = Math.abs(actual - expected);