go-curve/offset_test.go at master · dominikh/go-curve

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package curve

import (

"iter"

"testing"

)

// This test tries combinations of parameters that have caused problems in the past.

func TestOffsetPathologicalCurves(t *testing.T) {

curve := CubicBez{

P0: Pt(-1236.3746269978635, 152.17981429574826),

P1: Pt(-1175.18662093517, 108.04721798590596),

P2: Pt(-1152.142883879584, 105.76260301083356),

P3: Pt(-1151.842639804639, 105.73040758939104),

}

const offset = 3603.7267536453924

const accuracy = 0.1

path := offsetCubic(curve, offset, accuracy)

next, cancel := iter.Pull(path)

defer cancel()

if v, ok := next(); !ok || v.Kind != MoveToKind {

t.Fatalf("did not get valid path")

}

// Cubic offset that used to trigger infinite recursion.

func TestOffsetInfiniteRecursion(t *testing.T) {

const tolerance = 0.1

const offset = -0.5

c := CubicBez{

Pt(1096.2962962962963, 593.90243902439033),

Pt(1043.6213991769548, 593.90243902439033),

Pt(1030.4526748971193, 593.90243902439033),

Pt(1056.7901234567901, 593.90243902439033),

}

// Test that we terminate

for range offsetCubic(c, offset, tolerance) {

}

func TestCubicOffsetSimpleLine(t *testing.T) {

cubic := CubicBez{

Pt(0.0, 0.0),

Pt(10.0, 0.0),

Pt(20.0, 0.0),

Pt(30.0, 0.0),

}

// Test that we terminate

for range offsetCubic(cubic, 5, 1e-6) {

}

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