88 lines
2.1 KiB
JavaScript
88 lines
2.1 KiB
JavaScript
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import {expect, test} from 'vitest';
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import * as MathUtil from './math.js';
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test('transforms vertices', async () => {
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const expectCloseTo = (l, r) => {
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expect(l.length)
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.to.equal(r.length);
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for (let i = 0; i < l.length; ++i) {
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expect(l[i].x)
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.to.be.closeTo(r[i].x, 0.0001);
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expect(l[i].y)
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.to.be.closeTo(r[i].y, 0.0001);
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}
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}
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const vertices = [
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{x: -1, y: -1},
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{x: 1, y: -1},
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{x: 1, y: 1},
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{x: -1, y: 1},
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];
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expect(MathUtil.transform(vertices, {}))
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.to.deep.equal(vertices);
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expectCloseTo(
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MathUtil.transform(vertices, {scale: 2}),
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[
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{x: -2, y: -2},
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{x: 2, y: -2},
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{x: 2, y: 2},
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{x: -2, y: 2},
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],
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);
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expectCloseTo(
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MathUtil.transform(vertices, {rotation: MathUtil.QUARTER_PI}),
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[
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{x: 0, y: -Math.sqrt(2)},
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{x: Math.sqrt(2), y: 0},
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{x: 0, y: Math.sqrt(2)},
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{x: -Math.sqrt(2), y: 0},
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],
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);
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expectCloseTo(
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MathUtil.transform(vertices, {rotation: MathUtil.QUARTER_PI, scale: 2}),
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[
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{x: 0, y: -Math.sqrt(2) * 2},
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{x: Math.sqrt(2) * 2, y: 0},
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{x: 0, y: Math.sqrt(2) * 2},
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{x: -Math.sqrt(2) * 2, y: 0},
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],
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);
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expectCloseTo(
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MathUtil.transform(vertices, {translation: {x: 10, y: 10}}),
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[
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{x: 9, y: 9},
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{x: 11, y: 9},
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{x: 11, y: 11},
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{x: 9, y: 11},
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],
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);
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expectCloseTo(
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MathUtil.transform(vertices, {rotation: MathUtil.QUARTER_PI, translation: {x: 10, y: 10}}),
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[
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{x: 10, y: 10 - Math.sqrt(2)},
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{x: 10 + Math.sqrt(2), y: 10},
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{x: 10, y: 10 + Math.sqrt(2)},
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{x: 10 - Math.sqrt(2), y: 10},
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],
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);
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expectCloseTo(
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MathUtil.transform(vertices, {scale: 2, translation: {x: 10, y: 10}}),
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[
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{x: 8, y: 8},
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{x: 12, y: 8},
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{x: 12, y: 12},
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{x: 8, y: 12},
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],
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);
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expectCloseTo(
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MathUtil.transform(vertices, {rotation: MathUtil.QUARTER_PI, scale: 2, translation: {x: 10, y: 10}}),
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[
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{x: 10, y: 10 - Math.sqrt(2) * 2},
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{x: 10 + Math.sqrt(2) * 2, y: 10},
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{x: 10, y: 10 + Math.sqrt(2) * 2},
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{x: 10 - Math.sqrt(2) * 2, y: 10},
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],
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);
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});
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