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'use strict';
describe('Chart.helpers.canvas', function() {
describe('auto', jasmine.fixture.specs('helpers'));
var helpers = Chart.helpers;
describe('clearCanvas', function() {
it('should clear the chart canvas', function() {
var chart = acquireChart({}, {
canvas: {
style: 'width: 150px; height: 245px'
}
});
spyOn(chart.ctx, 'clearRect');
helpers.clearCanvas(chart.canvas, chart.ctx);
expect(chart.ctx.clearRect.calls.count()).toBe(1);
expect(chart.ctx.clearRect.calls.first().object).toBe(chart.ctx);
expect(chart.ctx.clearRect.calls.first().args).toEqual([0, 0, 150, 245]);
});
});
describe('isPointInArea', function() {
it('should return true when no area is provided', function() {
expect(helpers._isPointInArea({x: 1, y: 1})).toBe(true);
});
it('should determine if a point is in the area', function() {
var isPointInArea = helpers._isPointInArea;
var area = {left: 0, top: 0, right: 512, bottom: 256};
expect(isPointInArea({x: 0, y: 0}, area)).toBe(true);
expect(isPointInArea({x: -1e-12, y: -1e-12}, area)).toBe(true);
expect(isPointInArea({x: 512, y: 256}, area)).toBe(true);
expect(isPointInArea({x: 512 + 1e-12, y: 256 + 1e-12}, area)).toBe(true);
expect(isPointInArea({x: -0.5, y: 0}, area)).toBe(false);
expect(isPointInArea({x: 0, y: 256.5}, area)).toBe(false);
});
});
it('should return the width of the longest text in an Array and 2D Array', function() {
var context = window.createMockContext();
var font = "normal 12px 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif";
var arrayOfThings1D = ['FooBar', 'Bar'];
var arrayOfThings2D = [['FooBar_1', 'Bar_2'], 'Foo_1'];
// Regardless 'FooBar' is the longest label it should return (characters * 10)
expect(helpers._longestText(context, font, arrayOfThings1D, {})).toEqual(60);
expect(helpers._longestText(context, font, arrayOfThings2D, {})).toEqual(80);
// We check to make sure we made the right calls to the canvas.
expect(context.getCalls()).toEqual([{
name: 'save',
args: []
}, {
name: 'setFont',
args: ["normal 12px 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif"],
}, {
name: 'measureText',
args: ['FooBar']
}, {
name: 'measureText',
args: ['Bar']
}, {
name: 'restore',
args: []
}, {
name: 'save',
args: []
}, {
name: 'setFont',
args: ["normal 12px 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif"],
}, {
name: 'measureText',
args: ['FooBar_1']
}, {
name: 'measureText',
args: ['Bar_2']
}, {
name: 'measureText',
args: ['Foo_1']
}, {
name: 'restore',
args: []
}]);
});
it('compare text with current longest and update', function() {
var context = window.createMockContext();
var data = {};
var gc = [];
var longest = 70;
expect(helpers._measureText(context, data, gc, longest, 'foobar')).toEqual(70);
expect(helpers._measureText(context, data, gc, longest, 'foobar_')).toEqual(70);
expect(helpers._measureText(context, data, gc, longest, 'foobar_1')).toEqual(80);
// We check to make sure we made the right calls to the canvas.
expect(context.getCalls()).toEqual([{
name: 'measureText',
args: ['foobar']
}, {
name: 'measureText',
args: ['foobar_']
}, {
name: 'measureText',
args: ['foobar_1']
}]);
});
describe('renderText', function() {
it('should render multiple lines of text', function() {
var context = window.createMockContext();
var font = {string: '12px arial', lineHeight: 20};
helpers.renderText(context, ['foo', 'foo2'], 0, 0, font);
expect(context.getCalls()).toEqual([{
name: 'save',
args: [],
}, {
name: 'setFont',
args: ['12px arial'],
}, {
name: 'fillText',
args: ['foo', 0, 0, undefined],
}, {
name: 'fillText',
args: ['foo2', 0, 20, undefined],
}, {
name: 'restore',
args: [],
}]);
});
it('should accept the text maxWidth', function() {
var context = window.createMockContext();
var font = {string: '12px arial', lineHeight: 20};
helpers.renderText(context, 'foo', 0, 0, font, {maxWidth: 30});
expect(context.getCalls()).toEqual([{
name: 'save',
args: [],
}, {
name: 'setFont',
args: ['12px arial'],
}, {
name: 'fillText',
args: ['foo', 0, 0, 30],
}, {
name: 'restore',
args: [],
}]);
});
it('should underline the text', function() {
var context = window.createMockContext();
var font = {string: '12px arial', lineHeight: 20};
helpers.renderText(context, 'foo', 0, 0, font, {decorationWidth: 3, underline: true});
expect(context.getCalls()).toEqual([{
name: 'save',
args: [],
}, {
name: 'setFont',
args: ['12px arial'],
}, {
name: 'fillText',
args: ['foo', 0, 0, undefined],
}, {
name: 'measureText',
args: ['foo'],
}, {
name: 'setStrokeStyle',
args: [null],
}, {
name: 'beginPath',
args: [],
}, {
name: 'setLineWidth',
args: [3],
}, {
name: 'moveTo',
args: [-15, 8],
}, {
name: 'lineTo',
args: [25, 8],
}, {
name: 'stroke',
args: [],
}, {
name: 'restore',
args: [],
}]);
});
it('should strikethrough the text', function() {
var context = window.createMockContext();
var font = {string: '12px arial', lineHeight: 20};
helpers.renderText(context, 'foo', 0, 0, font, {strikethrough: true});
expect(context.getCalls()).toEqual([{
name: 'save',
args: [],
}, {
name: 'setFont',
args: ['12px arial'],
}, {
name: 'fillText',
args: ['foo', 0, 0, undefined],
}, {
name: 'measureText',
args: ['foo'],
}, {
name: 'setStrokeStyle',
args: [null],
}, {
name: 'beginPath',
args: [],
}, {
name: 'setLineWidth',
args: [2],
}, {
name: 'moveTo',
args: [-15, 2],
}, {
name: 'lineTo',
args: [25, 2],
}, {
name: 'stroke',
args: [],
}, {
name: 'restore',
args: [],
}]);
});
it('should set the fill style if supplied', function() {
var context = window.createMockContext();
var font = {string: '12px arial', lineHeight: 20};
helpers.renderText(context, 'foo', 0, 0, font, {color: 'red'});
expect(context.getCalls()).toEqual([{
name: 'save',
args: [],
}, {
name: 'setFont',
args: ['12px arial'],
}, {
name: 'setFillStyle',
args: ['red'],
}, {
name: 'fillText',
args: ['foo', 0, 0, undefined],
}, {
name: 'restore',
args: [],
}]);
});
it('should set the stroke style if supplied', function() {
var context = window.createMockContext();
var font = {string: '12px arial', lineHeight: 20};
helpers.renderText(context, 'foo', 0, 0, font, {strokeColor: 'red', strokeWidth: 2});
expect(context.getCalls()).toEqual([{
name: 'save',
args: [],
}, {
name: 'setFont',
args: ['12px arial'],
}, {
name: 'setStrokeStyle',
args: ['red'],
}, {
name: 'setLineWidth',
args: [2],
}, {
name: 'strokeText',
args: ['foo', 0, 0, undefined],
}, {
name: 'fillText',
args: ['foo', 0, 0, undefined],
}, {
name: 'restore',
args: [],
}]);
});
it('should set the text alignment', function() {
var context = window.createMockContext();
var font = {string: '12px arial', lineHeight: 20};
helpers.renderText(context, 'foo', 0, 0, font, {textAlign: 'left', textBaseline: 'middle'});
expect(context.getCalls()).toEqual([{
name: 'save',
args: [],
}, {
name: 'setFont',
args: ['12px arial'],
}, {
name: 'setTextAlign',
args: ['left'],
}, {
name: 'setTextBaseline',
args: ['middle'],
}, {
name: 'fillText',
args: ['foo', 0, 0, undefined],
}, {
name: 'restore',
args: [],
}]);
});
it('should translate and rotate text', function() {
var context = window.createMockContext();
var font = {string: '12px arial', lineHeight: 20};
helpers.renderText(context, 'foo', 0, 0, font, {rotation: 90, translation: [10, 20]});
expect(context.getCalls()).toEqual([{
name: 'save',
args: [],
}, {
name: 'setFont',
args: ['12px arial'],
}, {
name: 'translate',
args: [10, 20],
}, {
name: 'rotate',
args: [90],
}, {
name: 'fillText',
args: ['foo', 0, 0, undefined],
}, {
name: 'restore',
args: [],
}]);
});
});
});
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