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function getLabels(scale) {
return scale.ticks.map(t => t.label);
}
describe('Category scale tests', function() {
describe('auto', jasmine.fixture.specs('scale.category'));
it('Should register the constructor with the registry', function() {
var Constructor = Chart.registry.getScale('category');
expect(Constructor).not.toBe(undefined);
expect(typeof Constructor).toBe('function');
});
it('Should have the correct default config', function() {
var defaultConfig = Chart.defaults.scales.category;
expect(defaultConfig).toEqual({
ticks: {
callback: Chart.registry.getScale('category').defaults.ticks.callback
}
});
});
it('Should generate ticks from the data xLabels', function() {
var labels = ['tick1', 'tick2', 'tick3', 'tick4', 'tick5'];
var chart = window.acquireChart({
type: 'line',
data: {
xLabels: labels,
datasets: [{
data: [10, 5, 0, 25, 78]
}]
},
options: {
scales: {
x: {
type: 'category',
}
}
}
});
var scale = chart.scales.x;
expect(getLabels(scale)).toEqual(labels);
});
it('Should generate ticks from the data yLabels', function() {
var labels = ['tick1', 'tick2', 'tick3', 'tick4', 'tick5'];
var chart = window.acquireChart({
type: 'line',
data: {
yLabels: labels,
datasets: [{
data: [10, 5, 0, 25, 78]
}]
},
options: {
scales: {
y: {
type: 'category'
}
}
}
});
var scale = chart.scales.y;
expect(getLabels(scale)).toEqual(labels);
});
it('Should generate ticks from the axis labels', function() {
var labels = ['tick1', 'tick2', 'tick3', 'tick4', 'tick5'];
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
data: [10, 5, 0, 25, 78]
}]
},
options: {
scales: {
x: {
type: 'category',
labels: labels
}
}
}
});
var scale = chart.scales.x;
expect(getLabels(scale)).toEqual(labels);
});
it('Should generate missing labels', function() {
var labels = ['a', 'b', 'c', 'd'];
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
data: {a: 1, b: 3, c: -1, d: 10}
}]
},
options: {
scales: {
x: {
type: 'category',
labels: ['a']
}
}
}
});
var scale = chart.scales.x;
expect(getLabels(scale)).toEqual(labels);
});
it('should parse only to a valid index', function() {
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: [10, 5, 0, 25, 78]
}],
labels: ['tick1', 'tick2', 'tick3', 'tick4', 'tick5']
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom'
},
y: {
type: 'linear'
}
}
}
});
var scale = chart.scales.x;
expect(scale.parse(-10)).toEqual(0);
expect(scale.parse(-0.1)).toEqual(0);
expect(scale.parse(4.1)).toEqual(4);
expect(scale.parse(5)).toEqual(4);
expect(scale.parse(1)).toEqual(1);
expect(scale.parse(1.4)).toEqual(1);
expect(scale.parse(1.5)).toEqual(2);
expect(scale.parse('tick2')).toEqual(1);
});
it('should get the correct label for the index', function() {
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: [10, 5, 0, 25, 78]
}],
labels: ['tick1', 'tick2', 'tick3', 'tick4', 'tick5']
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom'
},
y: {
type: 'linear'
}
}
}
});
var scale = chart.scales.x;
expect(scale.getLabelForValue(1)).toBe('tick2');
});
it('Should get the correct pixel for a value when horizontal', function() {
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: [10, 5, 0, 25, 78]
}],
labels: ['tick1', 'tick2', 'tick3', 'tick4', 'tick_last']
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom'
},
y: {
type: 'linear'
}
}
}
});
var xScale = chart.scales.x;
expect(xScale.getPixelForValue(0)).toBeCloseToPixel(23 + 6); // plus lineHeight
expect(xScale.getValueForPixel(23)).toBe(0);
expect(xScale.getPixelForValue(4)).toBeCloseToPixel(487);
expect(xScale.getValueForPixel(487)).toBe(4);
xScale.options.offset = true;
chart.update();
expect(xScale.getPixelForValue(0)).toBeCloseToPixel(71 + 6); // plus lineHeight
expect(xScale.getValueForPixel(69)).toBe(0);
expect(xScale.getPixelForValue(4)).toBeCloseToPixel(461);
expect(xScale.getValueForPixel(417)).toBe(4);
});
it('Should get the correct pixel for a value when there are repeated labels', function() {
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: [10, 5, 0, 25, 78]
}],
labels: ['tick1', 'tick2', 'tick3', 'tick4', 'tick_last']
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom'
},
y: {
type: 'linear'
}
}
}
});
var xScale = chart.scales.x;
expect(xScale.getPixelForValue('tick1')).toBeCloseToPixel(23 + 6); // plus lineHeight
});
it('Should get the correct pixel for a value when horizontal and zoomed', function() {
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: [10, 5, 0, 25, 78]
}],
labels: ['tick1', 'tick2', 'tick3', 'tick4', 'tick_last']
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom',
min: 'tick2',
max: 'tick4'
},
y: {
type: 'linear'
}
}
}
});
var xScale = chart.scales.x;
expect(xScale.getPixelForValue(1)).toBeCloseToPixel(23 + 6); // plus lineHeight
expect(xScale.getPixelForValue(3)).toBeCloseToPixel(496);
xScale.options.offset = true;
chart.update();
expect(xScale.getPixelForValue(1)).toBeCloseToPixel(103 + 6); // plus lineHeight
expect(xScale.getPixelForValue(3)).toBeCloseToPixel(429);
});
it('should get the correct pixel for a value when vertical', function() {
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: ['3', '5', '1', '4', '2']
}],
labels: ['tick1', 'tick2', 'tick3', 'tick4', 'tick5'],
yLabels: ['1', '2', '3', '4', '5']
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom',
},
y: {
type: 'category',
position: 'left'
}
}
}
});
var yScale = chart.scales.y;
expect(yScale.getPixelForValue(0)).toBeCloseToPixel(32);
expect(yScale.getValueForPixel(257)).toBe(2);
expect(yScale.getPixelForValue(4)).toBeCloseToPixel(484);
expect(yScale.getValueForPixel(144)).toBe(1);
yScale.options.offset = true;
chart.update();
expect(yScale.getPixelForValue(0)).toBeCloseToPixel(77);
expect(yScale.getValueForPixel(256)).toBe(2);
expect(yScale.getPixelForValue(4)).toBeCloseToPixel(438);
expect(yScale.getValueForPixel(167)).toBe(1);
});
it('should get the correct pixel for a value when vertical and zoomed', function() {
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: ['3', '5', '1', '4', '2']
}],
labels: ['tick1', 'tick2', 'tick3', 'tick4', 'tick5'],
yLabels: ['1', '2', '3', '4', '5']
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom',
},
y: {
type: 'category',
position: 'left',
min: '2',
max: '4'
}
}
}
});
var yScale = chart.scales.y;
expect(yScale.getPixelForValue(1)).toBeCloseToPixel(32);
expect(yScale.getPixelForValue(3)).toBeCloseToPixel(482);
yScale.options.offset = true;
chart.update();
expect(yScale.getPixelForValue(1)).toBeCloseToPixel(107);
expect(yScale.getPixelForValue(3)).toBeCloseToPixel(407);
});
it('Should get the correct pixel for an object value when horizontal', function() {
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: [
{x: 0, y: 10},
{x: 1, y: 5},
{x: 2, y: 0},
{x: 3, y: 25},
{x: 0, y: 78}
]
}],
labels: [0, 1, 2, 3]
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom'
},
y: {
type: 'linear'
}
}
}
});
var xScale = chart.scales.x;
expect(xScale.getPixelForValue(0)).toBeCloseToPixel(29);
expect(xScale.getPixelForValue(3)).toBeCloseToPixel(506);
expect(xScale.getPixelForValue(4)).toBeCloseToPixel(664);
});
it('Should get the correct pixel for an object value when vertical', function() {
var chart = window.acquireChart({
type: 'line',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: [
{x: 0, y: 2},
{x: 1, y: 4},
{x: 2, y: 0},
{x: 3, y: 3},
{x: 0, y: 1}
]
}],
labels: [0, 1, 2, 3],
yLabels: [0, 1, 2, 3, 4]
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom'
},
y: {
type: 'category',
position: 'left'
}
}
}
});
var yScale = chart.scales.y;
expect(yScale.getPixelForValue(0)).toBeCloseToPixel(32);
expect(yScale.getPixelForValue(4)).toBeCloseToPixel(483);
});
it('Should get the correct pixel for an object value in a bar chart', function() {
var chart = window.acquireChart({
type: 'bar',
data: {
datasets: [{
xAxisID: 'x',
yAxisID: 'y',
data: [
{x: 0, y: 10},
{x: 1, y: 5},
{x: 2, y: 0},
{x: 3, y: 25},
{x: 0, y: 78}
]
}],
labels: [0, 1, 2, 3]
},
options: {
scales: {
x: {
type: 'category',
position: 'bottom'
},
y: {
type: 'linear'
}
}
}
});
var xScale = chart.scales.x;
expect(xScale.getPixelForValue(0)).toBeCloseToPixel(89);
expect(xScale.getPixelForValue(3)).toBeCloseToPixel(451);
expect(xScale.getPixelForValue(4)).toBeCloseToPixel(572);
});
it('Should get the correct pixel for an object value in a horizontal bar chart', function() {
var chart = window.acquireChart({
type: 'bar',
data: {
datasets: [{
data: [
{x: 10, y: 0},
{x: 5, y: 1},
{x: 0, y: 2},
{x: 25, y: 3},
{x: 78, y: 0}
]
}],
labels: [0, 1, 2, 3]
},
options: {
indexAxis: 'y',
scales: {
x: {
type: 'linear',
position: 'bottom'
},
y: {
type: 'category'
}
}
}
});
var yScale = chart.scales.y;
expect(yScale.getPixelForValue(0)).toBeCloseToPixel(88);
expect(yScale.getPixelForValue(3)).toBeCloseToPixel(426);
expect(yScale.getPixelForValue(4)).toBeCloseToPixel(538);
});
it('Should be consistent on pixels and values with autoSkipped ticks', function() {
var labels = [];
for (let i = 0; i < 50; i++) {
labels.push('very long label ' + i);
}
var chart = window.acquireChart({
type: 'bar',
data: {
labels,
datasets: [{
data: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
}]
}
});
var scale = chart.scales.x;
expect(scale.ticks.length).toBeLessThan(50);
let x = 0;
for (let i = 0; i < 50; i++) {
var x2 = scale.getPixelForValue(labels[i]);
var x3 = scale.getPixelForValue(i);
expect(x2).toEqual(x3);
expect(x2).toBeGreaterThan(x);
expect(scale.getValueForPixel(x2)).toBe(i);
x = x2;
}
});
it('Should bound to ticks/data', function() {
var chart = window.acquireChart({
type: 'line',
data: {
labels: ['a', 'b', 'c', 'd'],
datasets: [{
data: {b: 1, c: 99}
}]
},
options: {
scales: {
x: {
type: 'category',
bounds: 'data'
}
}
}
});
expect(chart.scales.x.min).toEqual(1);
expect(chart.scales.x.max).toEqual(2);
chart.options.scales.x.bounds = 'ticks';
chart.update();
expect(chart.scales.x.min).toEqual(0);
expect(chart.scales.x.max).toEqual(3);
});
});
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