File: vendors/chart.js/test/scale.linear.tests.js

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File: vendors/chart.js/test/scale.linear.tests.js
Role: Auxiliary data
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describe('Linear Scale', function() {
	var chartInstance;

	beforeEach(function() {
		window.addDefaultMatchers(jasmine);
	});

	afterEach(function() {
		if (chartInstance)
		{
			releaseChart(chartInstance);
		}
	});

	it('Should register the constructor with the scale service', function() {
		var Constructor = Chart.scaleService.getScaleConstructor('linear');
		expect(Constructor).not.toBe(undefined);
		expect(typeof Constructor).toBe('function');
	});

	it('Should have the correct default config', function() {
		var defaultConfig = Chart.scaleService.getScaleDefaults('linear');
		expect(defaultConfig).toEqual({
			display: true,

			gridLines: {
				color: "rgba(0, 0, 0, 0.1)",
				drawBorder: true,
				drawOnChartArea: true,
				drawTicks: true, // draw ticks extending towards the label
				tickMarkLength: 10,
				lineWidth: 1,
				offsetGridLines: false,
				display: true,
				zeroLineColor: "rgba(0,0,0,0.25)",
				zeroLineWidth: 1,
			},
			position: "left",
			scaleLabel: {
				labelString: '',
				display: false,
			},
			ticks: {
				beginAtZero: false,
				minRotation: 0,
				maxRotation: 50,
				mirror: false,
				padding: 10,
				reverse: false,
				display: true,
				callback: defaultConfig.ticks.callback, // make this work nicer, then check below
				autoSkip: true,
				autoSkipPadding: 0,
				labelOffset: 0
			}
		});

		expect(defaultConfig.ticks.callback).toEqual(jasmine.any(Function));
	});

	it('Should correctly determine the max & min data values', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [10, 5, 0, -5, 78, -100]
				}, {
					yAxisID: 'yScale1',
					data: [-1000, 1000],
				}, {
					yAxisID: 'yScale0',
					data: [150]
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear'
					}, {
						id: 'yScale1',
						type: 'linear'
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0).not.toEqual(undefined); // must construct
		expect(chartInstance.scales.yScale0.min).toBe(-100);
		expect(chartInstance.scales.yScale0.max).toBe(150);
	});

	it('Should correctly determine the max & min of string data values', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: ['10', '5', '0', '-5', '78', '-100']
				}, {
					yAxisID: 'yScale1',
					data: ['-1000', '1000'],
				}, {
					yAxisID: 'yScale0',
					data: ['150']
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear'
					}, {
						id: 'yScale1',
						type: 'linear'
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0).not.toEqual(undefined); // must construct
		expect(chartInstance.scales.yScale0.min).toBe(-100);
		expect(chartInstance.scales.yScale0.max).toBe(150);
	});

	it('Should correctly determine the max & min data values ignoring hidden datasets', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: ['10', '5', '0', '-5', '78', '-100']
				}, {
					yAxisID: 'yScale1',
					data: ['-1000', '1000'],
				}, {
					yAxisID: 'yScale0',
					data: ['150'],
					hidden: true
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear'
					}, {
						id: 'yScale1',
						type: 'linear'
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0).not.toEqual(undefined); // must construct
		expect(chartInstance.scales.yScale0.min).toBe(-100);
		expect(chartInstance.scales.yScale0.max).toBe(80);
	});

	it('Should correctly determine the max & min data values ignoring data that is NaN', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [null, 90, NaN, undefined, 45, 30]
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear'
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0.min).toBe(30);
		expect(chartInstance.scales.yScale0.max).toBe(90);

		// Scale is now stacked
		chartInstance.scales.yScale0.options.stacked = true;
		chartInstance.update();

		expect(chartInstance.scales.yScale0.min).toBe(0);
		expect(chartInstance.scales.yScale0.max).toBe(90);
	});

	it('Should correctly determine the max & min for scatter data', function() {
		chartInstance = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					xAxisID: 'xScale0',
					yAxisID: 'yScale0',
					data: [{
						x: 10,
						y: 100
					}, {
						x: -10,
						y: 0
					}, {
						x: 0,
						y: 0
					}, {
						x: 99,
						y: 7
					}]
				}],
			},
			options: {
				scales: {
					xAxes: [{
						id: 'xScale0',
						type: 'linear',
						position: 'bottom'
					}],
					yAxes: [{
						id: 'yScale0',
						type: 'linear'
					}]
				}
			}
		});
		chartInstance.update();

		expect(chartInstance.scales.xScale0.min).toBe(-20);
		expect(chartInstance.scales.xScale0.max).toBe(100);
		expect(chartInstance.scales.yScale0.min).toBe(0);
		expect(chartInstance.scales.yScale0.max).toBe(100);
	});

	it('Should correctly get the label for the given index', function() {
		chartInstance = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					xAxisID: 'xScale0',
					yAxisID: 'yScale0',
					data: [{
						x: 10,
						y: 100
					}, {
						x: -10,
						y: 0
					}, {
						x: 0,
						y: 0
					}, {
						x: 99,
						y: 7
					}]
				}],
			},
			options: {
				scales: {
					xAxes: [{
						id: 'xScale0',
						type: 'linear',
						position: 'bottom'
					}],
					yAxes: [{
						id: 'yScale0',
						type: 'linear'
					}]
				}
			}
		});
		chartInstance.update();

		expect(chartInstance.scales.yScale0.getLabelForIndex(3, 0)).toBe(7);
	});

	it('Should correctly determine the min and max data values when stacked mode is turned on', function() {
		chartInstance = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [10, 5, 0, -5, 78, -100],
					type: 'bar'
				}, {
					yAxisID: 'yScale1',
					data: [-1000, 1000],
				}, {
					yAxisID: 'yScale0',
					data: [150, 0, 0, -100, -10, 9],
					type: 'bar'
				}, {
					yAxisID: 'yScale0',
					data: [10, 10, 10, 10, 10, 10],
					type: 'line'
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
						stacked: true
					}, {
						id: 'yScale1',
						type: 'linear'
					}]
				}
			}
		});
		chartInstance.update();

		expect(chartInstance.scales.yScale0.min).toBe(-150);
		expect(chartInstance.scales.yScale0.max).toBe(200);
	});

	it('Should correctly determine the min and max data values when stacked mode is turned on and there are hidden datasets', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [10, 5, 0, -5, 78, -100],
				}, {
					yAxisID: 'yScale1',
					data: [-1000, 1000],
				}, {
					yAxisID: 'yScale0',
					data: [150, 0, 0, -100, -10, 9],
				}, {
					yAxisID: 'yScale0',
					data: [10, 20, 30, 40, 50, 60],
					hidden: true
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
						stacked: true
					}, {
						id: 'yScale1',
						type: 'linear'
					}]
				}
			}
		});
		chartInstance.update();

		expect(chartInstance.scales.yScale0.min).toBe(-150);
		expect(chartInstance.scales.yScale0.max).toBe(200);
	});

	it('Should correctly determine the min and max data values when stacked mode is turned on there are multiple types of datasets', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					type: 'bar',
					data: [10, 5, 0, -5, 78, -100]
				}, {
					type: 'line',
					data: [10, 10, 10, 10, 10, 10],
				}, {
					type: 'bar',
					data: [150, 0, 0, -100, -10, 9]
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
						stacked: true
					}]
				}
			}
		});

		chartInstance.scales.yScale0.determineDataLimits();
		expect(chartInstance.scales.yScale0.min).toBe(-105);
		expect(chartInstance.scales.yScale0.max).toBe(160);
	});

	it('Should ensure that the scale has a max and min that are not equal', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear'
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0).not.toEqual(undefined); // must construct
		expect(chartInstance.scales.yScale0.min).toBe(-1);
		expect(chartInstance.scales.yScale0.max).toBe(1);
	});

	it('Should ensure that the scale has a max and min that are not equal when beginAtZero is set', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
						ticks: {
							beginAtZero: true
						}
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0).not.toEqual(undefined); // must construct
		expect(chartInstance.scales.yScale0.min).toBe(0);
		expect(chartInstance.scales.yScale0.max).toBe(1);
	});

	it('Should use the suggestedMin and suggestedMax options', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [1, 1, 1, 2, 1, 0]
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
						ticks: {
							suggestedMax: 10,
							suggestedMin: -10
						}
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0).not.toEqual(undefined); // must construct
		expect(chartInstance.scales.yScale0.min).toBe(-10);
		expect(chartInstance.scales.yScale0.max).toBe(10);
	});

	it('Should use the min and max options', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [1, 1, 1, 2, 1, 0]
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
						ticks: {
							max: 1010,
							min: -1010
						}
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0).not.toEqual(undefined); // must construct
		expect(chartInstance.scales.yScale0.min).toBe(-1010);
		expect(chartInstance.scales.yScale0.max).toBe(1010);
		expect(chartInstance.scales.yScale0.ticks[0]).toBe('1010');
		expect(chartInstance.scales.yScale0.ticks[chartInstance.scales.yScale0.ticks.length - 1]).toBe('-1010');
	});

	it('should forcibly include 0 in the range if the beginAtZero option is used', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [20, 30, 40, 50]
				}],
				labels: ['a', 'b', 'c', 'd']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0).not.toEqual(undefined); // must construct
		expect(chartInstance.scales.yScale0.ticks).toEqual(['50', '45', '40', '35', '30', '25', '20']);

		chartInstance.scales.yScale0.options.ticks.beginAtZero = true;
		chartInstance.update();
		expect(chartInstance.scales.yScale0.ticks).toEqual(['50', '45', '40', '35', '30', '25', '20', '15', '10', '5', '0']);

		chartInstance.data.datasets[0].data = [-20, -30, -40, -50];
		chartInstance.update();
		expect(chartInstance.scales.yScale0.ticks).toEqual(['0', '-5', '-10', '-15', '-20', '-25', '-30', '-35', '-40', '-45', '-50']);

		chartInstance.scales.yScale0.options.ticks.beginAtZero = false;
		chartInstance.update();
		expect(chartInstance.scales.yScale0.ticks).toEqual(['-20', '-25', '-30', '-35', '-40', '-45', '-50']);
	});

	it('Should generate tick marks in the correct order in reversed mode', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [10, 5, 0, 25, 78]
				}],
				labels: ['a', 'b', 'c', 'd']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
						ticks: {
							reverse: true
						}
					}]
				}
			}
		});

		expect(chartInstance.scales.yScale0.ticks).toEqual(['0', '10', '20', '30', '40', '50', '60', '70', '80']);
		expect(chartInstance.scales.yScale0.start).toBe(80);
		expect(chartInstance.scales.yScale0.end).toBe(0);
	});

	it('should use the correct number of decimal places in the default format function', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [0.06, 0.005, 0, 0.025, 0.0078]
				}],
				labels: ['a', 'b', 'c', 'd']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
					}]
				}
			}
		});
		expect(chartInstance.scales.yScale0.ticks).toEqual(['0.06', '0.05', '0.04', '0.03', '0.02', '0.01', '0']);
	});

	it('Should build labels using the user supplied callback', function() {
		chartInstance = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'yScale0',
					data: [10, 5, 0, 25, 78]
				}],
				labels: ['a', 'b', 'c', 'd']
			},
			options: {
				scales: {
					yAxes: [{
						id: 'yScale0',
						type: 'linear',
						ticks: {
							callback: function(value, index) {
								return index.toString();
							}
						}
					}]
				}
			}
		});

		// Just the index
		expect(chartInstance.scales.yScale0.ticks).toEqual(['0', '1', '2', '3', '4', '5', '6', '7', '8']);
	});

	it('Should get the correct pixel value for a point', function() {
		chartInstance = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					xAxisID: 'xScale0',
					yAxisID: 'yScale0',
					data: []
				}],
			},
			options: {
				scales: {
					xAxes: [{
						id: 'xScale0',
						type: 'linear',
						position: 'bottom'
					}],
					yAxes: [{
						id: 'yScale0',
						type: 'linear'
					}]
				}
			}
		});

		var xScale = chartInstance.scales.xScale0;
		expect(xScale.getPixelForValue(1, 0, 0)).toBeCloseToPixel(501); // right - paddingRight
		expect(xScale.getPixelForValue(-1, 0, 0)).toBeCloseToPixel(41); // left + paddingLeft
		expect(xScale.getPixelForValue(0, 0, 0)).toBeCloseToPixel(271); // halfway*/

		expect(xScale.getValueForPixel(501)).toBeCloseTo(1, 1e-2);
		expect(xScale.getValueForPixel(41)).toBeCloseTo(-1, 1e-2);
		expect(xScale.getValueForPixel(271)).toBeCloseTo(0, 1e-2);

		var yScale = chartInstance.scales.yScale0;
		expect(yScale.getPixelForValue(1, 0, 0)).toBeCloseToPixel(32); // right - paddingRight
		expect(yScale.getPixelForValue(-1, 0, 0)).toBeCloseToPixel(484); // left + paddingLeft
		expect(yScale.getPixelForValue(0, 0, 0)).toBeCloseToPixel(258); // halfway*/

		expect(yScale.getValueForPixel(32)).toBe(1);
		expect(yScale.getValueForPixel(484)).toBe(-1);
		expect(yScale.getValueForPixel(258)).toBe(0);
	});

	it('should fit correctly', function() {
		chartInstance = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					xAxisID: 'xScale0',
					yAxisID: 'yScale0',
					data: [{
						x: 10,
						y: 100
					}, {
						x: -10,
						y: 0
					}, {
						x: 0,
						y: 0
					}, {
						x: 99,
						y: 7
					}]
				}],
			},
			options: {
				scales: {
					xAxes: [{
						id: 'xScale0',
						type: 'linear',
						position: 'bottom'
					}],
					yAxes: [{
						id: 'yScale0',
						type: 'linear'
					}]
				}
			}
		});

		var xScale = chartInstance.scales.xScale0;
		expect(xScale.paddingTop).toBeCloseToPixel(0);
		expect(xScale.paddingBottom).toBeCloseToPixel(0);
		expect(xScale.paddingLeft).toBeCloseToPixel(0);
		expect(xScale.paddingRight).toBeCloseToPixel(13.5);
		expect(xScale.width).toBeCloseToPixel(471);
		expect(xScale.height).toBeCloseToPixel(28);

		var yScale = chartInstance.scales.yScale0;
		expect(yScale.paddingTop).toBeCloseToPixel(0);
		expect(yScale.paddingBottom).toBeCloseToPixel(0);
		expect(yScale.paddingLeft).toBeCloseToPixel(0);
		expect(yScale.paddingRight).toBeCloseToPixel(0);
		expect(yScale.width).toBeCloseToPixel(41);
		expect(yScale.height).toBeCloseToPixel(452);

		// Extra size when scale label showing
		xScale.options.scaleLabel.display = true;
		yScale.options.scaleLabel.display = true;
		chartInstance.update();

		expect(xScale.paddingTop).toBeCloseToPixel(0);
		expect(xScale.paddingBottom).toBeCloseToPixel(0);
		expect(xScale.paddingLeft).toBeCloseToPixel(0);
		expect(xScale.paddingRight).toBeCloseToPixel(13.5);
		expect(xScale.width).toBeCloseToPixel(453);
		expect(xScale.height).toBeCloseToPixel(46);

		expect(yScale.paddingTop).toBeCloseToPixel(0);
		expect(yScale.paddingBottom).toBeCloseToPixel(0);
		expect(yScale.paddingLeft).toBeCloseToPixel(0);
		expect(yScale.paddingRight).toBeCloseToPixel(0);
		expect(yScale.width).toBeCloseToPixel(59);
		expect(yScale.height).toBeCloseToPixel(434);
	});
});

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