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describe('Core helper tests', function() {
var helpers;
beforeAll(function() {
helpers = window.Chart.helpers;
});
it('should filter an array', function() {
var data = [-10, 0, 6, 0, 7];
var callback = function(item) {
return item > 2;
};
expect(helpers.where(data, callback)).toEqual([6, 7]);
expect(helpers.findNextWhere(data, callback)).toEqual(6);
expect(helpers.findNextWhere(data, callback, 2)).toBe(7);
expect(helpers.findNextWhere(data, callback, 4)).toBe(undefined);
expect(helpers.findPreviousWhere(data, callback)).toBe(7);
expect(helpers.findPreviousWhere(data, callback, 3)).toBe(6);
expect(helpers.findPreviousWhere(data, callback, 0)).toBe(undefined);
});
it('should get the correct sign', function() {
expect(helpers.sign(0)).toBe(0);
expect(helpers.sign(10)).toBe(1);
expect(helpers.sign(-5)).toBe(-1);
});
it('should do a log10 operation', function() {
expect(helpers.log10(0)).toBe(-Infinity);
// Check all allowed powers of 10, which should return integer values
var maxPowerOf10 = Math.floor(helpers.log10(Number.MAX_VALUE));
for (var i = 0; i < maxPowerOf10; i += 1) {
expect(helpers.log10(Math.pow(10, i))).toBe(i);
}
});
it('should correctly determine if two numbers are essentially equal', function() {
expect(helpers.almostEquals(0, Number.EPSILON, 2 * Number.EPSILON)).toBe(true);
expect(helpers.almostEquals(1, 1.1, 0.0001)).toBe(false);
expect(helpers.almostEquals(1e30, 1e30 + Number.EPSILON, 0)).toBe(false);
expect(helpers.almostEquals(1e30, 1e30 + Number.EPSILON, 2 * Number.EPSILON)).toBe(true);
});
it('should correctly determine if a numbers are essentially whole', function() {
expect(helpers.almostWhole(0.99999, 0.0001)).toBe(true);
expect(helpers.almostWhole(0.9, 0.0001)).toBe(false);
});
it('should generate integer ids', function() {
var uid = helpers.uid();
expect(uid).toEqual(jasmine.any(Number));
expect(helpers.uid()).toBe(uid + 1);
expect(helpers.uid()).toBe(uid + 2);
expect(helpers.uid()).toBe(uid + 3);
});
it('should detect a number', function() {
expect(helpers.isNumber(123)).toBe(true);
expect(helpers.isNumber('123')).toBe(true);
expect(helpers.isNumber(null)).toBe(false);
expect(helpers.isNumber(NaN)).toBe(false);
expect(helpers.isNumber(undefined)).toBe(false);
expect(helpers.isNumber('cbc')).toBe(false);
});
it('should convert between radians and degrees', function() {
expect(helpers.toRadians(180)).toBe(Math.PI);
expect(helpers.toRadians(90)).toBe(0.5 * Math.PI);
expect(helpers.toDegrees(Math.PI)).toBe(180);
expect(helpers.toDegrees(Math.PI * 3 / 2)).toBe(270);
});
it('should get the correct number of decimal places', function() {
expect(helpers._decimalPlaces(100)).toBe(0);
expect(helpers._decimalPlaces(1)).toBe(0);
expect(helpers._decimalPlaces(0)).toBe(0);
expect(helpers._decimalPlaces(0.01)).toBe(2);
expect(helpers._decimalPlaces(-0.01)).toBe(2);
expect(helpers._decimalPlaces('1')).toBe(undefined);
expect(helpers._decimalPlaces('')).toBe(undefined);
expect(helpers._decimalPlaces(undefined)).toBe(undefined);
});
it('should get an angle from a point', function() {
var center = {
x: 0,
y: 0
};
expect(helpers.getAngleFromPoint(center, {
x: 0,
y: 10
})).toEqual({
angle: Math.PI / 2,
distance: 10,
});
expect(helpers.getAngleFromPoint(center, {
x: Math.sqrt(2),
y: Math.sqrt(2)
})).toEqual({
angle: Math.PI / 4,
distance: 2
});
expect(helpers.getAngleFromPoint(center, {
x: -1.0 * Math.sqrt(2),
y: -1.0 * Math.sqrt(2)
})).toEqual({
angle: Math.PI * 1.25,
distance: 2
});
});
it('should spline curves', function() {
expect(helpers.splineCurve({
x: 0,
y: 0
}, {
x: 1,
y: 1
}, {
x: 2,
y: 0
}, 0)).toEqual({
previous: {
x: 1,
y: 1,
},
next: {
x: 1,
y: 1,
}
});
expect(helpers.splineCurve({
x: 0,
y: 0
}, {
x: 1,
y: 1
}, {
x: 2,
y: 0
}, 1)).toEqual({
previous: {
x: 0,
y: 1,
},
next: {
x: 2,
y: 1,
}
});
});
it('should spline curves with monotone cubic interpolation', function() {
var dataPoints = [
{_model: {x: 0, y: 0, skip: false}},
{_model: {x: 3, y: 6, skip: false}},
{_model: {x: 9, y: 6, skip: false}},
{_model: {x: 12, y: 60, skip: false}},
{_model: {x: 15, y: 60, skip: false}},
{_model: {x: 18, y: 120, skip: false}},
{_model: {x: null, y: null, skip: true}},
{_model: {x: 21, y: 180, skip: false}},
{_model: {x: 24, y: 120, skip: false}},
{_model: {x: 27, y: 125, skip: false}},
{_model: {x: 30, y: 105, skip: false}},
{_model: {x: 33, y: 110, skip: false}},
{_model: {x: 33, y: 110, skip: false}},
{_model: {x: 36, y: 170, skip: false}}
];
helpers.splineCurveMonotone(dataPoints);
expect(dataPoints).toEqual([{
_model: {
x: 0,
y: 0,
skip: false,
controlPointNextX: 1,
controlPointNextY: 2
}
},
{
_model: {
x: 3,
y: 6,
skip: false,
controlPointPreviousX: 2,
controlPointPreviousY: 6,
controlPointNextX: 5,
controlPointNextY: 6
}
},
{
_model: {
x: 9,
y: 6,
skip: false,
controlPointPreviousX: 7,
controlPointPreviousY: 6,
controlPointNextX: 10,
controlPointNextY: 6
}
},
{
_model: {
x: 12,
y: 60,
skip: false,
controlPointPreviousX: 11,
controlPointPreviousY: 60,
controlPointNextX: 13,
controlPointNextY: 60
}
},
{
_model: {
x: 15,
y: 60,
skip: false,
controlPointPreviousX: 14,
controlPointPreviousY: 60,
controlPointNextX: 16,
controlPointNextY: 60
}
},
{
_model: {
x: 18,
y: 120,
skip: false,
controlPointPreviousX: 17,
controlPointPreviousY: 100
}
},
{
_model: {
x: null,
y: null,
skip: true
}
},
{
_model: {
x: 21,
y: 180,
skip: false,
controlPointNextX: 22,
controlPointNextY: 160
}
},
{
_model: {
x: 24,
y: 120,
skip: false,
controlPointPreviousX: 23,
controlPointPreviousY: 120,
controlPointNextX: 25,
controlPointNextY: 120
}
},
{
_model: {
x: 27,
y: 125,
skip: false,
controlPointPreviousX: 26,
controlPointPreviousY: 125,
controlPointNextX: 28,
controlPointNextY: 125
}
},
{
_model: {
x: 30,
y: 105,
skip: false,
controlPointPreviousX: 29,
controlPointPreviousY: 105,
controlPointNextX: 31,
controlPointNextY: 105
}
},
{
_model: {
x: 33,
y: 110,
skip: false,
controlPointPreviousX: 32,
controlPointPreviousY: 110,
controlPointNextX: 33,
controlPointNextY: 110
}
},
{
_model: {
x: 33,
y: 110,
skip: false,
controlPointPreviousX: 33,
controlPointPreviousY: 110,
controlPointNextX: 34,
controlPointNextY: 110
}
},
{
_model: {
x: 36,
y: 170,
skip: false,
controlPointPreviousX: 35,
controlPointPreviousY: 150
}
}]);
});
it('should get the next or previous item in an array', function() {
var testData = [0, 1, 2];
expect(helpers.nextItem(testData, 0, false)).toEqual(1);
expect(helpers.nextItem(testData, 2, false)).toEqual(2);
expect(helpers.nextItem(testData, 2, true)).toEqual(0);
expect(helpers.nextItem(testData, 1, true)).toEqual(2);
expect(helpers.nextItem(testData, -1, false)).toEqual(0);
expect(helpers.previousItem(testData, 0, false)).toEqual(0);
expect(helpers.previousItem(testData, 0, true)).toEqual(2);
expect(helpers.previousItem(testData, 2, false)).toEqual(1);
expect(helpers.previousItem(testData, 1, true)).toEqual(0);
});
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: 'measureText',
args: ['FooBar']
}, {
name: 'measureText',
args: ['Bar']
}, {
name: 'measureText',
args: ['FooBar_1']
}, {
name: 'measureText',
args: ['Bar_2']
}, {
name: 'measureText',
args: ['Foo_1']
}]);
});
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']
}]);
});
it('count look at all the labels and return maximum number of lines', function() {
window.createMockContext();
var arrayOfThings1 = ['Foo', 'Bar'];
var arrayOfThings2 = [['Foo', 'Bar'], 'Foo'];
var arrayOfThings3 = [['Foo', 'Bar', 'Boo'], ['Foo', 'Bar'], 'Foo'];
expect(helpers.numberOfLabelLines(arrayOfThings1)).toEqual(1);
expect(helpers.numberOfLabelLines(arrayOfThings2)).toEqual(2);
expect(helpers.numberOfLabelLines(arrayOfThings3)).toEqual(3);
});
it ('should get the maximum width and height for a node', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
// Create the div we want to get the max size for
var innerDiv = document.createElement('div');
div.appendChild(innerDiv);
expect(helpers.getMaximumWidth(innerDiv)).toBe(200);
expect(helpers.getMaximumHeight(innerDiv)).toBe(300);
document.body.removeChild(div);
});
it ('should get the maximum width and height for a node in a ShadowRoot', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
if (!div.attachShadow) {
// Shadow DOM is not natively supported
return;
}
var shadow = div.attachShadow({mode: 'closed'});
// Create the div we want to get the max size for
var innerDiv = document.createElement('div');
shadow.appendChild(innerDiv);
expect(helpers.getMaximumWidth(innerDiv)).toBe(200);
expect(helpers.getMaximumHeight(innerDiv)).toBe(300);
document.body.removeChild(div);
});
it ('should get the maximum width of a node that has a max-width style', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
// Create the div we want to get the max size for and set a max-width style
var innerDiv = document.createElement('div');
innerDiv.style.maxWidth = '150px';
div.appendChild(innerDiv);
expect(helpers.getMaximumWidth(innerDiv)).toBe(150);
document.body.removeChild(div);
});
it ('should get the maximum height of a node that has a max-height style', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
// Create the div we want to get the max size for and set a max-height style
var innerDiv = document.createElement('div');
innerDiv.style.maxHeight = '150px';
div.appendChild(innerDiv);
expect(helpers.getMaximumHeight(innerDiv)).toBe(150);
document.body.removeChild(div);
});
it ('should get the maximum width of a node when the parent has a max-width style', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
// Create an inner wrapper around our div we want to size and give that a max-width style
var parentDiv = document.createElement('div');
parentDiv.style.maxWidth = '150px';
div.appendChild(parentDiv);
// Create the div we want to get the max size for
var innerDiv = document.createElement('div');
parentDiv.appendChild(innerDiv);
expect(helpers.getMaximumWidth(innerDiv)).toBe(150);
document.body.removeChild(div);
});
it ('should get the maximum height of a node when the parent has a max-height style', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
// Create an inner wrapper around our div we want to size and give that a max-height style
var parentDiv = document.createElement('div');
parentDiv.style.maxHeight = '150px';
div.appendChild(parentDiv);
// Create the div we want to get the max size for
var innerDiv = document.createElement('div');
innerDiv.style.height = '300px'; // make it large
parentDiv.appendChild(innerDiv);
expect(helpers.getMaximumHeight(innerDiv)).toBe(150);
document.body.removeChild(div);
});
it ('should get the maximum width of a node that has a percentage max-width style', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
// Create the div we want to get the max size for and set a max-width style
var innerDiv = document.createElement('div');
innerDiv.style.maxWidth = '50%';
div.appendChild(innerDiv);
expect(helpers.getMaximumWidth(innerDiv)).toBe(100);
document.body.removeChild(div);
});
it ('should get the maximum height of a node that has a percentage max-height style', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
// Create the div we want to get the max size for and set a max-height style
var innerDiv = document.createElement('div');
innerDiv.style.maxHeight = '50%';
div.appendChild(innerDiv);
expect(helpers.getMaximumHeight(innerDiv)).toBe(150);
document.body.removeChild(div);
});
it ('should get the maximum width of a node when the parent has a percentage max-width style', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
// Create an inner wrapper around our div we want to size and give that a max-width style
var parentDiv = document.createElement('div');
parentDiv.style.maxWidth = '50%';
div.appendChild(parentDiv);
// Create the div we want to get the max size for
var innerDiv = document.createElement('div');
parentDiv.appendChild(innerDiv);
expect(helpers.getMaximumWidth(innerDiv)).toBe(100);
document.body.removeChild(div);
});
it ('should get the maximum height of a node when the parent has a percentage max-height style', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '200px';
div.style.height = '300px';
document.body.appendChild(div);
// Create an inner wrapper around our div we want to size and give that a max-height style
var parentDiv = document.createElement('div');
parentDiv.style.maxHeight = '50%';
div.appendChild(parentDiv);
var innerDiv = document.createElement('div');
innerDiv.style.height = '300px'; // make it large
parentDiv.appendChild(innerDiv);
expect(helpers.getMaximumHeight(innerDiv)).toBe(150);
document.body.removeChild(div);
});
it ('should leave styled height and width on canvas if explicitly set', function() {
var chart = window.acquireChart({}, {
canvas: {
height: 200,
width: 200,
style: 'height: 400px; width: 400px;'
}
});
helpers.retinaScale(chart, true);
var canvas = chart.canvas;
expect(canvas.style.height).toBe('400px');
expect(canvas.style.width).toBe('400px');
});
it ('Should get padding of parent as number (pixels) when defined as percent (returns incorrectly in IE11)', function() {
// Create div with fixed size as a test bed
var div = document.createElement('div');
div.style.width = '300px';
div.style.height = '300px';
document.body.appendChild(div);
// Inner DIV to have 5% padding of parent
var innerDiv = document.createElement('div');
div.appendChild(innerDiv);
var canvas = document.createElement('canvas');
innerDiv.appendChild(canvas);
// No padding
expect(helpers.getMaximumWidth(canvas)).toBe(300);
// test with percentage
innerDiv.style.padding = '5%';
expect(helpers.getMaximumWidth(canvas)).toBe(270);
// test with pixels
innerDiv.style.padding = '10px';
expect(helpers.getMaximumWidth(canvas)).toBe(280);
document.body.removeChild(div);
});
describe('Color helper', function() {
function isColorInstance(obj) {
return typeof obj === 'object' && obj.hasOwnProperty('values') && obj.values.hasOwnProperty('rgb');
}
it('should return a color when called with a color', function() {
expect(isColorInstance(helpers.color('rgb(1, 2, 3)'))).toBe(true);
});
it('should return a color when called with a CanvasGradient instance', function() {
var context = document.createElement('canvas').getContext('2d');
var gradient = context.createLinearGradient(0, 1, 2, 3);
expect(isColorInstance(helpers.color(gradient))).toBe(true);
});
});
describe('Background hover color helper', function() {
it('should return a CanvasPattern when called with a CanvasPattern', function(done) {
var dots = new Image();
dots.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAMAAAAolt3jAAAAD1BMVEUAAAD///////////////+PQt5oAAAABXRSTlMAHlFhZsfk/BEAAAAqSURBVHgBY2BgZGJmYmSAAUYWEIDzmcBcJhiXGcxlRpPFrhdmMiqgvX0AcGIBEUAo6UAAAAAASUVORK5CYII=';
dots.onload = function() {
var chartContext = document.createElement('canvas').getContext('2d');
var patternCanvas = document.createElement('canvas');
var patternContext = patternCanvas.getContext('2d');
var pattern = patternContext.createPattern(dots, 'repeat');
patternContext.fillStyle = pattern;
var backgroundColor = helpers.getHoverColor(chartContext.createPattern(patternCanvas, 'repeat'));
expect(backgroundColor instanceof CanvasPattern).toBe(true);
done();
};
});
it('should return a CanvasGradient when called with a CanvasGradient', function() {
var context = document.createElement('canvas').getContext('2d');
var gradient = context.createLinearGradient(0, 1, 2, 3);
expect(helpers.getHoverColor(gradient) instanceof CanvasGradient).toBe(true);
});
it('should return a modified version of color when called with a color', function() {
var originalColorRGB = 'rgb(70, 191, 189)';
expect(helpers.getHoverColor('#46BFBD')).not.toEqual(originalColorRGB);
});
});
});