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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package image
import (
"fmt"
"testing"
)
func TestRectangle(t *testing.T) {
// in checks that every point in f is in g.
in := func(f, g Rectangle) error {
if !f.In(g) {
return fmt.Errorf("f=%s, f.In(%s): got false, want true", f, g)
}
for y := f.Min.Y; y < f.Max.Y; y++ {
for x := f.Min.X; x < f.Max.X; x++ {
p := Point{x, y}
if !p.In(g) {
return fmt.Errorf("p=%s, p.In(%s): got false, want true", p, g)
}
}
}
return nil
}
rects := []Rectangle{
Rect(0, 0, 10, 10),
Rect(10, 0, 20, 10),
Rect(1, 2, 3, 4),
Rect(4, 6, 10, 10),
Rect(2, 3, 12, 5),
Rect(-1, -2, 0, 0),
Rect(-1, -2, 4, 6),
Rect(-10, -20, 30, 40),
Rect(8, 8, 8, 8),
Rect(88, 88, 88, 88),
Rect(6, 5, 4, 3),
}
// r.Eq(s) should be equivalent to every point in r being in s, and every
// point in s being in r.
for _, r := range rects {
for _, s := range rects {
got := r.Eq(s)
want := in(r, s) == nil && in(s, r) == nil
if got != want {
t.Errorf("Eq: r=%s, s=%s: got %t, want %t", r, s, got, want)
}
}
}
// The intersection should be the largest rectangle a such that every point
// in a is both in r and in s.
for _, r := range rects {
for _, s := range rects {
a := r.Intersect(s)
if err := in(a, r); err != nil {
t.Errorf("Intersect: r=%s, s=%s, a=%s, a not in r: %v", r, s, a, err)
}
if err := in(a, s); err != nil {
t.Errorf("Intersect: r=%s, s=%s, a=%s, a not in s: %v", r, s, a, err)
}
if isZero, overlaps := a == (Rectangle{}), r.Overlaps(s); isZero == overlaps {
t.Errorf("Intersect: r=%s, s=%s, a=%s: isZero=%t same as overlaps=%t",
r, s, a, isZero, overlaps)
}
largerThanA := [4]Rectangle{a, a, a, a}
largerThanA[0].Min.X--
largerThanA[1].Min.Y--
largerThanA[2].Max.X++
largerThanA[3].Max.Y++
for i, b := range largerThanA {
if b.Empty() {
// b isn't actually larger than a.
continue
}
if in(b, r) == nil && in(b, s) == nil {
t.Errorf("Intersect: r=%s, s=%s, a=%s, b=%s, i=%d: intersection could be larger",
r, s, a, b, i)
}
}
}
}
// The union should be the smallest rectangle a such that every point in r
// is in a and every point in s is in a.
for _, r := range rects {
for _, s := range rects {
a := r.Union(s)
if err := in(r, a); err != nil {
t.Errorf("Union: r=%s, s=%s, a=%s, r not in a: %v", r, s, a, err)
}
if err := in(s, a); err != nil {
t.Errorf("Union: r=%s, s=%s, a=%s, s not in a: %v", r, s, a, err)
}
if a.Empty() {
// You can't get any smaller than a.
continue
}
smallerThanA := [4]Rectangle{a, a, a, a}
smallerThanA[0].Min.X++
smallerThanA[1].Min.Y++
smallerThanA[2].Max.X--
smallerThanA[3].Max.Y--
for i, b := range smallerThanA {
if in(r, b) == nil && in(s, b) == nil {
t.Errorf("Union: r=%s, s=%s, a=%s, b=%s, i=%d: union could be smaller",
r, s, a, b, i)
}
}
}
}
}