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Check some more data on the linear scale after fitting

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Evert Timberg
2015-08-30 21:50:41 -04:00
parent c8d5856216
commit 02e0f3f856
1 changed files with 123 additions and 0 deletions
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123
test/scale.linear.tests.js
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@@ -162,6 +162,47 @@ describe('Linear Scale', function() {
expect(scale.max).toBe(1);
});
it ('should forcibly include 0 in the range if the beginAtZero option is used', function() {
var scaleID = 'myScale';
var mockData = {
datasets: [{
yAxisID: scaleID,
data: [20, 30, 40, 50]
}]
};
var config = Chart.helpers.clone(Chart.scaleService.getScaleDefaults('linear'));
var Constructor = Chart.scaleService.getScaleConstructor('linear');
var scale = new Constructor({
ctx: {},
options: config,
data: mockData,
id: scaleID
});
scale.calculateRange();
scale.generateTicks(400, 400);
expect(scale.ticks).toEqual([50, 45, 40, 35, 30, 25, 20]);
config.beginAtZero = true;
scale.calculateRange();
scale.generateTicks(400, 400);
expect(scale.ticks).toEqual([50, 45, 40, 35, 30, 25, 20, 15, 10, 5, 0]);
mockData.datasets[0].data = [-20, -30, -40, -50];
scale.calculateRange();
scale.generateTicks(400, 400);
expect(scale.ticks).toEqual([0, -5, -10, -15, -20, -25, -30, -35, -40, -45, -50]);
config.beginAtZero = false;
scale.calculateRange();
scale.generateTicks(400, 400);
expect(scale.ticks).toEqual([-20, -25, -30, -35, -40, -45, -50]);
});
it ('Should generate tick marks', function() {
var scaleID = 'myScale';
@@ -406,4 +447,86 @@ describe('Linear Scale', function() {
expect(horizontalScale.getPointPixelForValue(-2, 0, 0)).toBe(5); // left + paddingLeft
expect(horizontalScale.getPointPixelForValue(0, 0, 0)).toBe(55); // halfway
});
it ('should get the correct pixel value for a bar', function() {
var scaleID = 'myScale';
var mockData = {
datasets: [{
xAxisID: scaleID, // for the horizontal scale
yAxisID: scaleID,
data: [-5, 0, 2, -3, 5]
}]
};
var config = Chart.helpers.clone(Chart.scaleService.getScaleDefaults('linear'));
var Constructor = Chart.scaleService.getScaleConstructor('linear');
var verticalScale = new Constructor({
ctx: {},
options: config,
data: mockData,
id: scaleID
});
verticalScale.calculateRange();
verticalScale.generateTicks(50, 100);
// Fake out positioning of the scale service
verticalScale.left = 0;
verticalScale.top = 0;
verticalScale.right = 50;
verticalScale.bottom = 110;
verticalScale.paddingTop = 5;
verticalScale.paddingBottom = 5;
verticalScale.width = 50;
verticalScale.height = 110;
expect(verticalScale.calculateBarBase()).toBe(56); // 0 point
expect(verticalScale.calculateBarY(0, 0)).toBe(96.66666666666667); // bottom
});
it ('should fit correctly', function() {
var scaleID = 'myScale';
var mockData = {
datasets: [{
xAxisID: scaleID, // for the horizontal scale
yAxisID: scaleID,
data: [-5, 0, 2, -3, 5]
}]
};
var mockContext = window.createMockContext();
var config = Chart.helpers.clone(Chart.scaleService.getScaleDefaults('linear'));
var Constructor = Chart.scaleService.getScaleConstructor('linear');
var verticalScale = new Constructor({
ctx: mockContext,
options: config,
data: mockData,
id: scaleID
});
var minSize = verticalScale.fit(100, 300);
expect(minSize).toEqual({
width: 33,
height: 300,
});
expect(verticalScale.width).toBe(33);
expect(verticalScale.height).toBe(300);
expect(verticalScale.paddingTop).toBe(6);
expect(verticalScale.paddingBottom).toBe(6);
expect(verticalScale.paddingLeft).toBe(0);
expect(verticalScale.paddingRight).toBe(0);
// Refit with margins to see the padding go away
minSize = verticalScale.fit(33, 300, {left: 0, right: 0, top: 15, bottom: 3});
expect(minSize).toEqual({
width: 33,
height: 300,
});
expect(verticalScale.paddingTop).toBe(0);
expect(verticalScale.paddingBottom).toBe(3);
expect(verticalScale.paddingLeft).toBe(0);
expect(verticalScale.paddingRight).toBe(0);
});
});