controller.bar.tests.js

// Test the bar controller
describe('Bar controller tests', function() {
	it('should be constructed', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [
					{data: []},
					{data: []}
				],
				labels: []
			}
		});

		var meta = chart.getDatasetMeta(1);
		expect(meta.type).toEqual('bar');
		expect(meta.data).toEqual([]);
		expect(meta.hidden).toBe(null);
		expect(meta.controller).not.toBe(undefined);
		expect(meta.controller.index).toBe(1);
		expect(meta.xAxisID).not.toBe(null);
		expect(meta.yAxisID).not.toBe(null);

		meta.controller.updateIndex(0);
		expect(meta.controller.index).toBe(0);
	});

	it('should use the first scale IDs if the dataset does not specify them', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [
					{data: []},
					{data: []}
				],
				labels: []
			},
			options: {
				scales: {
					xAxes: [{
						id: 'firstXScaleID'
					}],
					yAxes: [{
						id: 'firstYScaleID'
					}]
				}
			}
		});

		var meta = chart.getDatasetMeta(1);
		expect(meta.xAxisID).toBe('firstXScaleID');
		expect(meta.yAxisID).toBe('firstYScaleID');
	});

	it('should correctly count the number of bar datasets', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [
					{data: [], type: 'line'},
					{data: [], hidden: true},
					{data: []},
					{data: []}
				],
				labels: []
			}
		});

		var meta = chart.getDatasetMeta(1);
		expect(meta.controller.getBarCount()).toBe(2);
	});

	it('should correctly get the bar index accounting for hidden datasets', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [
					{data: []},
					{data: [], hidden: true},
					{data: [], type: 'line'},
					{data: []}
				],
				labels: []
			}
		});

		var meta = chart.getDatasetMeta(1);
		expect(meta.controller.getBarIndex(0)).toBe(0);
		expect(meta.controller.getBarIndex(3)).toBe(1);
	});

	it('should create rectangle elements for each data item during initialization', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [
					{data: []},
					{data: [10, 15, 0, -4]}
				],
				labels: []
			}
		});

		var meta = chart.getDatasetMeta(1);
		expect(meta.data.length).toBe(4); // 4 rectangles created
		expect(meta.data[0] instanceof Chart.elements.Rectangle).toBe(true);
		expect(meta.data[1] instanceof Chart.elements.Rectangle).toBe(true);
		expect(meta.data[2] instanceof Chart.elements.Rectangle).toBe(true);
		expect(meta.data[3] instanceof Chart.elements.Rectangle).toBe(true);
	});

	it('should update elements when modifying data', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [1, 2],
					label: 'dataset1'
				}, {
					data: [10, 15, 0, -4],
					label: 'dataset2',
					borderColor: 'blue'
				}],
				labels: ['label1', 'label2', 'label3', 'label4']
			},
			options: {
				elements: {
					rectangle: {
						backgroundColor: 'red',
						borderSkipped: 'top',
						borderColor: 'green',
						borderWidth: 2,
					}
				},
				scales: {
					xAxes: [{
						id: 'firstXScaleID',
						type: 'category'
					}],
					yAxes: [{
						id: 'firstYScaleID',
						type: 'linear'
					}]
				}
			}
		});

		var meta = chart.getDatasetMeta(1);
		expect(meta.data.length).toBe(4);

		chart.data.datasets[1].data = [1, 2]; // remove 2 items
		chart.data.datasets[1].borderWidth = 1;
		chart.update();

		expect(meta.data.length).toBe(2);

		[
			{x: 113, y: 484},
			{x: 229, y: 32}
		].forEach(function(expected, i) {
			expect(meta.data[i]._datasetIndex).toBe(1);
			expect(meta.data[i]._index).toBe(i);
			expect(meta.data[i]._xScale).toBe(chart.scales.firstXScaleID);
			expect(meta.data[i]._yScale).toBe(chart.scales.firstYScaleID);
			expect(meta.data[i]._model.x).toBeCloseToPixel(expected.x);
			expect(meta.data[i]._model.y).toBeCloseToPixel(expected.y);
			expect(meta.data[i]._model.base).toBeCloseToPixel(484);
			expect(meta.data[i]._model.width).toBeCloseToPixel(40);
			expect(meta.data[i]._model).toEqual(jasmine.objectContaining({
				datasetLabel: chart.config.data.datasets[1].label,
				label: chart.config.data.labels[i],
				backgroundColor: 'red',
				borderSkipped: 'top',
				borderColor: 'blue',
				borderWidth: 1
			}));
		});

		chart.data.datasets[1].data = [1, 2, 3]; // add 1 items
		chart.update();

		expect(meta.data.length).toBe(3); // should add a new meta data item
	});

	it('should get the correct bar points when datasets of different types exist', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [1, 2],
					label: 'dataset1'
				}, {
					type: 'line',
					data: [4, 6],
					label: 'dataset2'
				}, {
					data: [8, 10],
					label: 'dataset3'
				}],
				labels: ['label1', 'label2']
			},
			options: {
				scales: {
					xAxes: [{
						type: 'category'
					}],
					yAxes: [{
						type: 'linear'
					}]
				}
			}
		});

		var meta = chart.getDatasetMeta(2);
		expect(meta.data.length).toBe(2);

		var bar1 = meta.data[0];
		var bar2 = meta.data[1];

		expect(bar1._model.x).toBeCloseToPixel(187);
		expect(bar1._model.y).toBeCloseToPixel(132);
		expect(bar2._model.x).toBeCloseToPixel(422);
		expect(bar2._model.y).toBeCloseToPixel(32);
	});

	it('should update elements when the scales are stacked', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [10, -10, 10, -10],
					label: 'dataset1'
				}, {
					data: [10, 15, 0, -4],
					label: 'dataset2'
				}],
				labels: ['label1', 'label2', 'label3', 'label4']
			},
			options: {
				scales: {
					xAxes: [{
						type: 'category',
						stacked: true,
						barPercentage: 1
					}],
					yAxes: [{
						type: 'linear',
						stacked: true
					}]
				}
			}
		});

		var meta0 = chart.getDatasetMeta(0);

		[
			{b: 290, w: 93, x: 86, y: 161},
			{b: 290, w: 93, x: 202, y: 419},
			{b: 290, w: 93, x: 318, y: 161},
			{b: 290, w: 93, x: 436, y: 419}
		].forEach(function(values, i) {
			expect(meta0.data[i]._model.base).toBeCloseToPixel(values.b);
			expect(meta0.data[i]._model.width).toBeCloseToPixel(values.w);
			expect(meta0.data[i]._model.x).toBeCloseToPixel(values.x);
			expect(meta0.data[i]._model.y).toBeCloseToPixel(values.y);
		});

		var meta1 = chart.getDatasetMeta(1);

		[
			{b: 161, w: 93, x: 86, y: 32},
			{b: 290, w: 93, x: 202, y: 97},
			{b: 161, w: 93, x: 318, y: 161},
			{b: 419, w: 93, x: 436, y: 471}
		].forEach(function(values, i) {
			expect(meta1.data[i]._model.base).toBeCloseToPixel(values.b);
			expect(meta1.data[i]._model.width).toBeCloseToPixel(values.w);
			expect(meta1.data[i]._model.x).toBeCloseToPixel(values.x);
			expect(meta1.data[i]._model.y).toBeCloseToPixel(values.y);
		});
	});

	it('should update elements when the scales are stacked and data is strings', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: ['10', '-10', '10', '-10'],
					label: 'dataset1'
				}, {
					data: ['10', '15', '0', '-4'],
					label: 'dataset2'
				}],
				labels: ['label1', 'label2', 'label3', 'label4']
			},
			options: {
				scales: {
					xAxes: [{
						type: 'category',
						stacked: true,
						barPercentage: 1
					}],
					yAxes: [{
						type: 'linear',
						stacked: true
					}]
				}
			}
		});

		var meta0 = chart.getDatasetMeta(0);

		[
			{b: 290, w: 93, x: 86, y: 161},
			{b: 290, w: 93, x: 202, y: 419},
			{b: 290, w: 93, x: 318, y: 161},
			{b: 290, w: 93, x: 436, y: 419}
		].forEach(function(values, i) {
			expect(meta0.data[i]._model.base).toBeCloseToPixel(values.b);
			expect(meta0.data[i]._model.width).toBeCloseToPixel(values.w);
			expect(meta0.data[i]._model.x).toBeCloseToPixel(values.x);
			expect(meta0.data[i]._model.y).toBeCloseToPixel(values.y);
		});

		var meta1 = chart.getDatasetMeta(1);

		[
			{b: 161, w: 93, x: 86, y: 32},
			{b: 290, w: 93, x: 202, y: 97},
			{b: 161, w: 93, x: 318, y: 161},
			{b: 419, w: 93, x: 436, y: 471}
		].forEach(function(values, i) {
			expect(meta1.data[i]._model.base).toBeCloseToPixel(values.b);
			expect(meta1.data[i]._model.width).toBeCloseToPixel(values.w);
			expect(meta1.data[i]._model.x).toBeCloseToPixel(values.x);
			expect(meta1.data[i]._model.y).toBeCloseToPixel(values.y);
		});
	});

	it('should update elements when the scales are stacked and the y axis is logarithmic', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [10, 100, 10, 100],
					label: 'dataset1'
				}, {
					data: [100, 10, 0, 100],
					label: 'dataset2'
				}],
				labels: ['label1', 'label2', 'label3', 'label4']
			},
			options: {
				scales: {
					xAxes: [{
						type: 'category',
						stacked: true,
						barPercentage: 1
					}],
					yAxes: [{
						type: 'logarithmic',
						stacked: true
					}]
				}
			}
		});

		var meta0 = chart.getDatasetMeta(0);

		[
			{b: 484, w: 92, x: 94, y: 379},
			{b: 484, w: 92, x: 208, y: 122},
			{b: 484, w: 92, x: 322, y: 379},
			{b: 484, w: 92, x: 436, y: 122}
		].forEach(function(values, i) {
			expect(meta0.data[i]._model.base).toBeCloseToPixel(values.b);
			expect(meta0.data[i]._model.width).toBeCloseToPixel(values.w);
			expect(meta0.data[i]._model.x).toBeCloseToPixel(values.x);
			expect(meta0.data[i]._model.y).toBeCloseToPixel(values.y);
		});

		var meta1 = chart.getDatasetMeta(1);

		[
			{b: 379, w: 92, x: 94, y: 109},
			{b: 122, w: 92, x: 208, y: 109},
			{b: 379, w: 92, x: 322, y: 379},
			{b: 122, w: 92, x: 436, y: 25}
		].forEach(function(values, i) {
			expect(meta1.data[i]._model.base).toBeCloseToPixel(values.b);
			expect(meta1.data[i]._model.width).toBeCloseToPixel(values.w);
			expect(meta1.data[i]._model.x).toBeCloseToPixel(values.x);
			expect(meta1.data[i]._model.y).toBeCloseToPixel(values.y);
		});
	});

	it('should draw all bars', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [],
				}, {
					data: [10, 15, 0, -4],
					label: 'dataset2'
				}],
				labels: ['label1', 'label2', 'label3', 'label4']
			}
		});

		var meta = chart.getDatasetMeta(1);

		spyOn(meta.data[0], 'draw');
		spyOn(meta.data[1], 'draw');
		spyOn(meta.data[2], 'draw');
		spyOn(meta.data[3], 'draw');

		chart.update();

		expect(meta.data[0].draw.calls.count()).toBe(1);
		expect(meta.data[1].draw.calls.count()).toBe(1);
		expect(meta.data[2].draw.calls.count()).toBe(1);
		expect(meta.data[3].draw.calls.count()).toBe(1);
	});

	it('should set hover styles on rectangles', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [],
				}, {
					data: [10, 15, 0, -4],
					label: 'dataset2'
				}],
				labels: ['label1', 'label2', 'label3', 'label4']
			},
			options: {
				elements: {
					rectangle: {
						backgroundColor: 'rgb(255, 0, 0)',
						borderColor: 'rgb(0, 0, 255)',
						borderWidth: 2,
					}
				}
			}
		});

		var meta = chart.getDatasetMeta(1);
		var bar = meta.data[0];

		meta.controller.setHoverStyle(bar);
		expect(bar._model.backgroundColor).toBe('rgb(230, 0, 0)');
		expect(bar._model.borderColor).toBe('rgb(0, 0, 230)');
		expect(bar._model.borderWidth).toBe(2);

		// Set a dataset style
		chart.data.datasets[1].hoverBackgroundColor = 'rgb(128, 128, 128)';
		chart.data.datasets[1].hoverBorderColor = 'rgb(0, 0, 0)';
		chart.data.datasets[1].hoverBorderWidth = 5;

		meta.controller.setHoverStyle(bar);
		expect(bar._model.backgroundColor).toBe('rgb(128, 128, 128)');
		expect(bar._model.borderColor).toBe('rgb(0, 0, 0)');
		expect(bar._model.borderWidth).toBe(5);

		// Should work with array styles so that we can set per bar
		chart.data.datasets[1].hoverBackgroundColor = ['rgb(255, 255, 255)', 'rgb(128, 128, 128)'];
		chart.data.datasets[1].hoverBorderColor = ['rgb(9, 9, 9)', 'rgb(0, 0, 0)'];
		chart.data.datasets[1].hoverBorderWidth = [2.5, 5];

		meta.controller.setHoverStyle(bar);
		expect(bar._model.backgroundColor).toBe('rgb(255, 255, 255)');
		expect(bar._model.borderColor).toBe('rgb(9, 9, 9)');
		expect(bar._model.borderWidth).toBe(2.5);

		// Should allow a custom style
		bar.custom = {
			hoverBackgroundColor: 'rgb(255, 0, 0)',
			hoverBorderColor: 'rgb(0, 255, 0)',
			hoverBorderWidth: 1.5
		};

		meta.controller.setHoverStyle(bar);
		expect(bar._model.backgroundColor).toBe('rgb(255, 0, 0)');
		expect(bar._model.borderColor).toBe('rgb(0, 255, 0)');
		expect(bar._model.borderWidth).toBe(1.5);
	});

	it('should remove a hover style from a bar', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [],
				}, {
					data: [10, 15, 0, -4],
					label: 'dataset2'
				}],
				labels: ['label1', 'label2', 'label3', 'label4']
			},
			options: {
				elements: {
					rectangle: {
						backgroundColor: 'rgb(255, 0, 0)',
						borderColor: 'rgb(0, 0, 255)',
						borderWidth: 2,
					}
				}
			}
		});

		var meta = chart.getDatasetMeta(1);
		var bar = meta.data[0];

		// Change default
		chart.options.elements.rectangle.backgroundColor = 'rgb(128, 128, 128)';
		chart.options.elements.rectangle.borderColor = 'rgb(15, 15, 15)';
		chart.options.elements.rectangle.borderWidth = 3.14;

		// Remove to defaults
		meta.controller.removeHoverStyle(bar);
		expect(bar._model.backgroundColor).toBe('rgb(128, 128, 128)');
		expect(bar._model.borderColor).toBe('rgb(15, 15, 15)');
		expect(bar._model.borderWidth).toBe(3.14);

		// Should work with array styles so that we can set per bar
		chart.data.datasets[1].backgroundColor = ['rgb(255, 255, 255)', 'rgb(128, 128, 128)'];
		chart.data.datasets[1].borderColor = ['rgb(9, 9, 9)', 'rgb(0, 0, 0)'];
		chart.data.datasets[1].borderWidth = [2.5, 5];

		meta.controller.removeHoverStyle(bar);
		expect(bar._model.backgroundColor).toBe('rgb(255, 255, 255)');
		expect(bar._model.borderColor).toBe('rgb(9, 9, 9)');
		expect(bar._model.borderWidth).toBe(2.5);

		// Should allow a custom style
		bar.custom = {
			backgroundColor: 'rgb(255, 0, 0)',
			borderColor: 'rgb(0, 255, 0)',
			borderWidth: 1.5
		};

		meta.controller.removeHoverStyle(bar);
		expect(bar._model.backgroundColor).toBe('rgb(255, 0, 0)');
		expect(bar._model.borderColor).toBe('rgb(0, 255, 0)');
		expect(bar._model.borderWidth).toBe(1.5);
	});

	describe('Bar width', function() {
		beforeEach(function() {
			// 2 datasets
			this.data = {
				labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
				datasets: [{
					data: [10, 20, 30, 40, 50, 60, 70],
				}, {
					data: [10, 20, 30, 40, 50, 60, 70],
				}]
			};
		});

		afterEach(function() {
			var chart = window.acquireChart(this.config);
			var meta = chart.getDatasetMeta(0);
			var xScale = chart.scales[meta.xAxisID];

			var categoryPercentage = xScale.options.categoryPercentage;
			var barPercentage = xScale.options.barPercentage;
			var stacked = xScale.options.stacked;

			var totalBarWidth = 0;
			for (var i = 0; i < chart.data.datasets.length; i++) {
				var bars = chart.getDatasetMeta(i).data;
				for (var j = xScale.minIndex; j <= xScale.maxIndex; j++) {
					totalBarWidth += bars[j]._model.width;
				}
				if (stacked) {
					break;
				}
			}

			var actualValue = totalBarWidth;
			var expectedValue = xScale.width * categoryPercentage * barPercentage;
			expect(actualValue).toBeCloseToPixel(expectedValue);

		});

		it('should correctly set bar width when min and max option is set.', function() {
			this.config = {
				type: 'bar',
				data: this.data,
				options: {
					scales: {
						xAxes: [{
							ticks: {
								min: 'March',
								max: 'May',
							},
						}]
					}
				}
			};
		});

		it('should correctly set bar width when scale are stacked with min and max options.', function() {
			this.config = {
				type: 'bar',
				data: this.data,
				options: {
					scales: {
						xAxes: [{
							ticks: {
								min: 'March',
								max: 'May',
							},
							stacked: true,
						}]
					}
				}
			};
		});
	});

	describe('Bar height (horizontalBar type)', function() {
		beforeEach(function() {
			// 2 datasets
			this.data = {
				labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
				datasets: [{
					data: [10, 20, 30, 40, 50, 60, 70],
				}, {
					data: [10, 20, 30, 40, 50, 60, 70],
				}]
			};
		});

		afterEach(function() {
			var chart = window.acquireChart(this.config);
			var meta = chart.getDatasetMeta(0);
			var yScale = chart.scales[meta.yAxisID];

			var categoryPercentage = yScale.options.categoryPercentage;
			var barPercentage = yScale.options.barPercentage;
			var stacked = yScale.options.stacked;

			var totalBarHeight = 0;
			for (var i = 0; i < chart.data.datasets.length; i++) {
				var bars = chart.getDatasetMeta(i).data;
				for (var j = yScale.minIndex; j <= yScale.maxIndex; j++) {
					totalBarHeight += bars[j]._model.height;
				}
				if (stacked) {
					break;
				}
			}

			var actualValue = totalBarHeight;
			var expectedValue = yScale.height * categoryPercentage * barPercentage;
			expect(actualValue).toBeCloseToPixel(expectedValue);

		});

		it('should correctly set bar height when min and max option is set.', function() {
			this.config = {
				type: 'horizontalBar',
				data: this.data,
				options: {
					scales: {
						yAxes: [{
							ticks: {
								min: 'March',
								max: 'May',
							},
						}]
					}
				}
			};
		});

		it('should correctly set bar height when scale are stacked with min and max options.', function() {
			this.config = {
				type: 'horizontalBar',
				data: this.data,
				options: {
					scales: {
						yAxes: [{
							ticks: {
								min: 'March',
								max: 'May',
							},
							stacked: true,
						}]
					}
				}
			};
		});
	});
});