mirror of
https://github.com/chartjs/Chart.js.git
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391e4b6f2e
* generate a flat helpers package * move helpers built files to dist * upgrade docs for flat helpers
103 lines
2.9 KiB
JavaScript
103 lines
2.9 KiB
JavaScript
'use strict';
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describe('Chart.helpers.canvas', function() {
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describe('auto', jasmine.fixture.specs('helpers'));
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var helpers = Chart.helpers;
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describe('clear', function() {
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it('should clear the chart canvas', function() {
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var chart = acquireChart({}, {
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canvas: {
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style: 'width: 150px; height: 245px'
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}
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});
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spyOn(chart.ctx, 'clearRect');
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helpers.clear(chart);
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expect(chart.ctx.clearRect.calls.count()).toBe(1);
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expect(chart.ctx.clearRect.calls.first().object).toBe(chart.ctx);
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expect(chart.ctx.clearRect.calls.first().args).toEqual([0, 0, 150, 245]);
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});
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});
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describe('isPointInArea', function() {
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it('should determine if a point is in the area', function() {
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var isPointInArea = helpers._isPointInArea;
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var area = {left: 0, top: 0, right: 512, bottom: 256};
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expect(isPointInArea({x: 0, y: 0}, area)).toBe(true);
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expect(isPointInArea({x: -1e-12, y: -1e-12}, area)).toBe(true);
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expect(isPointInArea({x: 512, y: 256}, area)).toBe(true);
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expect(isPointInArea({x: 512 + 1e-12, y: 256 + 1e-12}, area)).toBe(true);
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expect(isPointInArea({x: -0.5, y: 0}, area)).toBe(false);
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expect(isPointInArea({x: 0, y: 256.5}, area)).toBe(false);
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});
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});
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it('should return the width of the longest text in an Array and 2D Array', function() {
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var context = window.createMockContext();
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var font = "normal 12px 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif";
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var arrayOfThings1D = ['FooBar', 'Bar'];
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var arrayOfThings2D = [['FooBar_1', 'Bar_2'], 'Foo_1'];
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// Regardless 'FooBar' is the longest label it should return (characters * 10)
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expect(helpers._longestText(context, font, arrayOfThings1D, {})).toEqual(60);
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expect(helpers._longestText(context, font, arrayOfThings2D, {})).toEqual(80);
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// We check to make sure we made the right calls to the canvas.
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expect(context.getCalls()).toEqual([{
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name: 'save',
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args: []
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}, {
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name: 'measureText',
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args: ['FooBar']
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}, {
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name: 'measureText',
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args: ['Bar']
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}, {
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name: 'restore',
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args: []
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}, {
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name: 'save',
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args: []
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}, {
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name: 'measureText',
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args: ['FooBar_1']
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}, {
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name: 'measureText',
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args: ['Bar_2']
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}, {
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name: 'measureText',
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args: ['Foo_1']
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}, {
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name: 'restore',
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args: []
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}]);
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});
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it('compare text with current longest and update', function() {
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var context = window.createMockContext();
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var data = {};
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var gc = [];
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var longest = 70;
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expect(helpers._measureText(context, data, gc, longest, 'foobar')).toEqual(70);
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expect(helpers._measureText(context, data, gc, longest, 'foobar_')).toEqual(70);
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expect(helpers._measureText(context, data, gc, longest, 'foobar_1')).toEqual(80);
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// We check to make sure we made the right calls to the canvas.
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expect(context.getCalls()).toEqual([{
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name: 'measureText',
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args: ['foobar']
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}, {
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name: 'measureText',
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args: ['foobar_']
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}, {
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name: 'measureText',
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args: ['foobar_1']
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}]);
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});
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});
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