36 lines
972 B
JavaScript
36 lines
972 B
JavaScript
import expect from 'expect'
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import insertKnot from '../../src/util/insertKnot'
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describe('Insert knot', () => {
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it('throws error if knot is invalid', () => {
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const controlPoints = [
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{ x: 0, y: 0 },
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{ x: 10, y: 0 },
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{ x: 10, y: 10 },
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{ x: 0, y: 10 },
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{ x: 0, y: 20 },
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{ x: 10, y: 20 },
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]
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const k = 4
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const knots = [0, 0, 0, 0, 1, 2, 3, 3, 3, 3]
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expect(() => {
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insertKnot(k, controlPoints, knots, 4)
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}).toThrow(/^invalid new knot$/)
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expect(() => {
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insertKnot(k, controlPoints, knots, -1)
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}).toThrow(/^invalid new knot$/)
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const newSpline = insertKnot(k, controlPoints, knots, 1)
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expect(newSpline.controlPoints).toEqual([
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{ x: 0, y: 0 },
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{ x: 10, y: 0 },
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{ x: 10, y: 5 },
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{ x: 6.666666666666668, y: 10 },
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{ x: 0, y: 10 },
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{ x: 0, y: 20 },
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{ x: 10, y: 20 },
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])
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expect(newSpline.knots).toEqual([0, 0, 0, 0, 1, 1, 2, 3, 3, 3, 3])
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})
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})
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