/
geometry-test.js
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/
geometry-test.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import {
pointEqualToPoint,
sizeEqualToSize,
rectEqualToRect,
sizeIsValid,
sizeIsEmpty,
rectIntersectsRect,
intersectionOfRects,
rectContainsPoint,
unionOfRects,
} from '../geometry';
describe(pointEqualToPoint, () => {
it('should return true when 2 points have the same values', () => {
expect(pointEqualToPoint({x: 1, y: 1}, {x: 1, y: 1})).toBe(true);
expect(pointEqualToPoint({x: -1, y: 2}, {x: -1, y: 2})).toBe(true);
expect(
pointEqualToPoint({x: 3.14159, y: 0.26535}, {x: 3.14159, y: 0.26535}),
).toBe(true);
});
it('should return false when 2 points have different values', () => {
expect(pointEqualToPoint({x: 1, y: 1}, {x: 1, y: 0})).toBe(false);
expect(pointEqualToPoint({x: -1, y: 2}, {x: 0, y: 1})).toBe(false);
expect(
pointEqualToPoint({x: 3.1416, y: 0.26534}, {x: 3.14159, y: 0.26535}),
).toBe(false);
});
});
describe(sizeEqualToSize, () => {
it('should return true when 2 sizes have the same values', () => {
expect(sizeEqualToSize({width: 1, height: 1}, {width: 1, height: 1})).toBe(
true,
);
expect(
sizeEqualToSize({width: -1, height: 2}, {width: -1, height: 2}),
).toBe(true);
expect(
sizeEqualToSize(
{width: 3.14159, height: 0.26535},
{width: 3.14159, height: 0.26535},
),
).toBe(true);
});
it('should return false when 2 sizes have different values', () => {
expect(sizeEqualToSize({width: 1, height: 1}, {width: 1, height: 0})).toBe(
false,
);
expect(sizeEqualToSize({width: -1, height: 2}, {width: 0, height: 1})).toBe(
false,
);
expect(
sizeEqualToSize(
{width: 3.1416, height: 0.26534},
{width: 3.14159, height: 0.26535},
),
).toBe(false);
});
});
describe(rectEqualToRect, () => {
it('should return true when 2 rects have the same values', () => {
expect(
rectEqualToRect(
{origin: {x: 1, y: 1}, size: {width: 1, height: 1}},
{origin: {x: 1, y: 1}, size: {width: 1, height: 1}},
),
).toBe(true);
expect(
rectEqualToRect(
{origin: {x: 1, y: 2}, size: {width: 3.14, height: 4}},
{origin: {x: 1, y: 2}, size: {width: 3.14, height: 4}},
),
).toBe(true);
});
it('should return false when 2 rects have different values', () => {
expect(
rectEqualToRect(
{origin: {x: 1, y: 1}, size: {width: 1, height: 1}},
{origin: {x: 0, y: 1}, size: {width: 1, height: 1}},
),
).toBe(false);
expect(
rectEqualToRect(
{origin: {x: 1, y: 2}, size: {width: 3.14, height: 4}},
{origin: {x: 1, y: 2}, size: {width: 3.15, height: 4}},
),
).toBe(false);
});
});
describe(sizeIsValid, () => {
it('should return true when the size has non-negative width and height', () => {
expect(sizeIsValid({width: 1, height: 1})).toBe(true);
expect(sizeIsValid({width: 0, height: 0})).toBe(true);
});
it('should return false when the size has negative width or height', () => {
expect(sizeIsValid({width: 0, height: -1})).toBe(false);
expect(sizeIsValid({width: -1, height: 0})).toBe(false);
expect(sizeIsValid({width: -1, height: -1})).toBe(false);
});
});
describe(sizeIsEmpty, () => {
it('should return true when the size has negative area', () => {
expect(sizeIsEmpty({width: 1, height: -1})).toBe(true);
expect(sizeIsEmpty({width: -1, height: -1})).toBe(true);
});
it('should return true when the size has zero area', () => {
expect(sizeIsEmpty({width: 0, height: 0})).toBe(true);
expect(sizeIsEmpty({width: 0, height: 1})).toBe(true);
expect(sizeIsEmpty({width: 1, height: 0})).toBe(true);
});
it('should return false when the size has positive area', () => {
expect(sizeIsEmpty({width: 1, height: 1})).toBe(false);
expect(sizeIsEmpty({width: 2, height: 1})).toBe(false);
});
});
describe(rectIntersectsRect, () => {
it('should return true when 2 rects intersect', () => {
// Rects touch
expect(
rectIntersectsRect(
{origin: {x: 0, y: 0}, size: {width: 1, height: 1}},
{origin: {x: 1, y: 1}, size: {width: 1, height: 1}},
),
).toEqual(true);
// Rects overlap
expect(
rectIntersectsRect(
{origin: {x: 0, y: 0}, size: {width: 2, height: 1}},
{origin: {x: 1, y: -2}, size: {width: 0.5, height: 5}},
),
).toEqual(true);
// Rects are equal
expect(
rectIntersectsRect(
{origin: {x: 1, y: 2}, size: {width: 3.14, height: 4}},
{origin: {x: 1, y: 2}, size: {width: 3.14, height: 4}},
),
).toEqual(true);
});
it('should return false when 2 rects do not intersect', () => {
expect(
rectIntersectsRect(
{origin: {x: 0, y: 1}, size: {width: 1, height: 1}},
{origin: {x: 0, y: 10}, size: {width: 1, height: 1}},
),
).toBe(false);
expect(
rectIntersectsRect(
{origin: {x: 1, y: 2}, size: {width: 3.14, height: 4}},
{origin: {x: -4, y: 2}, size: {width: 3.15, height: 4}},
),
).toBe(false);
});
});
describe(intersectionOfRects, () => {
// NOTE: Undefined behavior if rects do not intersect
it('should return intersection when 2 rects intersect', () => {
// Rects touch
expect(
intersectionOfRects(
{origin: {x: 0, y: 0}, size: {width: 1, height: 1}},
{origin: {x: 1, y: 1}, size: {width: 1, height: 1}},
),
).toEqual({origin: {x: 1, y: 1}, size: {width: 0, height: 0}});
// Rects overlap
expect(
intersectionOfRects(
{origin: {x: 0, y: 0}, size: {width: 2, height: 1}},
{origin: {x: 1, y: -2}, size: {width: 0.5, height: 5}},
),
).toEqual({origin: {x: 1, y: 0}, size: {width: 0.5, height: 1}});
// Rects are equal
expect(
intersectionOfRects(
{origin: {x: 1, y: 2}, size: {width: 9.24, height: 4}},
{origin: {x: 1, y: 2}, size: {width: 9.24, height: 4}},
),
).toEqual({origin: {x: 1, y: 2}, size: {width: 9.24, height: 4}});
});
});
describe(rectContainsPoint, () => {
it("should return true if point is on the rect's edge", () => {
expect(
rectContainsPoint(
{x: 0, y: 0},
{origin: {x: 0, y: 0}, size: {width: 1, height: 1}},
),
).toBe(true);
expect(
rectContainsPoint(
{x: 5, y: 0},
{origin: {x: 0, y: 0}, size: {width: 10, height: 1}},
),
).toBe(true);
expect(
rectContainsPoint(
{x: 1, y: 1},
{origin: {x: 0, y: 0}, size: {width: 1, height: 1}},
),
).toBe(true);
});
it('should return true if point is in rect', () => {
expect(
rectContainsPoint(
{x: 5, y: 50},
{origin: {x: 0, y: 0}, size: {width: 10, height: 100}},
),
).toBe(true);
});
it('should return false if point is not in rect', () => {
expect(
rectContainsPoint(
{x: -1, y: 0},
{origin: {x: 0, y: 0}, size: {width: 1, height: 1}},
),
).toBe(false);
});
});
describe(unionOfRects, () => {
it('should return zero rect if no rects are provided', () => {
expect(unionOfRects()).toEqual({
origin: {x: 0, y: 0},
size: {width: 0, height: 0},
});
});
it('should return rect if 1 rect is provided', () => {
expect(
unionOfRects({origin: {x: 1, y: 2}, size: {width: 3, height: 4}}),
).toEqual({origin: {x: 1, y: 2}, size: {width: 3, height: 4}});
});
it('should return union of rects if more than one rect is provided', () => {
expect(
unionOfRects(
{origin: {x: 1, y: 2}, size: {width: 3, height: 4}},
{origin: {x: 100, y: 200}, size: {width: 3, height: 4}},
{origin: {x: -10, y: -20}, size: {width: 50, height: 60}},
),
).toEqual({origin: {x: -10, y: -20}, size: {width: 113, height: 224}});
});
});