125 lines
3.9 KiB
Go
Executable File
125 lines
3.9 KiB
Go
Executable File
// CookieJar - A contestant's algorithm toolbox
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// Copyright (c) 2013 Peter Szilagyi. All rights reserved.
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//
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// CookieJar is dual licensed: use of this source code is governed by a BSD
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// license that can be found in the LICENSE file. Alternatively, the CookieJar
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// toolbox may be used in accordance with the terms and conditions contained
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// in a signed written agreement between you and the author(s).
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package geometry
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import (
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"math"
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"testing"
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)
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var origin2 = &Point2{0, 0}
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var unitX2 = &Point2{1, 0}
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var unitY2 = &Point2{0, 1}
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var origin3 = &Point3{0, 0, 0}
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var unitX3 = &Point3{1, 0, 0}
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var unitY3 = &Point3{0, 1, 0}
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var unitZ3 = &Point3{0, 0, 1}
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var diag3 = &Point3{1, 1, 1}
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func TestDist2D(t *testing.T) {
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if d := origin2.Dist(unitX2); math.Abs(d-1) > eps {
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t.Errorf("distance mismatch: have %v, want %v.", d, 1)
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}
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if d := origin2.Dist(unitY2); math.Abs(d-1) > eps {
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t.Errorf("distance mismatch: have %v, want %v.", d, 1)
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}
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if d := unitX2.Dist(unitY2); math.Abs(d-math.Sqrt2) > eps {
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t.Errorf("distance mismatch: have %v, want %v.", d, math.Sqrt2)
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}
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}
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func TestDistSqr2D(t *testing.T) {
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if d := origin2.DistSqr(unitX2); math.Abs(d-1) > eps {
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t.Errorf("squared distance mismatch: have %v, want %v.", d, 1)
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}
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if d := origin2.DistSqr(unitY2); math.Abs(d-1) > eps {
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t.Errorf("squared distance mismatch: have %v, want %v.", d, 1)
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}
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if d := unitX2.DistSqr(unitY2); math.Abs(d-2) > eps {
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t.Errorf("squared distance mismatch: have %v, want %v.", d, 2)
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}
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}
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func TestEqual2D(t *testing.T) {
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// Check X coordinate
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a, b, c := &Point2{0, 0}, &Point2{0.999999 * eps, 0}, &Point2{eps, 0}
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if !a.Equal(b) {
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t.Errorf("equality should hold: %v == %v (given eps)", a, b)
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}
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if a.Equal(c) {
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t.Errorf("equality should not hold: %v == %v (given eps)", a, c)
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}
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// Check Y coordinate
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a, b, c = &Point2{0, 0}, &Point2{0, 0.999999 * eps}, &Point2{0, eps}
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if !a.Equal(b) {
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t.Errorf("equality should hold: %v == %v (given eps)", a, b)
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}
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if a.Equal(c) {
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t.Errorf("equality should not hold: %v == %v (given eps)", a, c)
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}
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}
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func TestDist3D(t *testing.T) {
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if d := origin3.Dist(unitX3); math.Abs(d-1) > eps {
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t.Errorf("distance mismatch: have %v, want %v.", d, 1)
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}
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if d := origin3.Dist(unitY3); math.Abs(d-1) > eps {
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t.Errorf("distance mismatch: have %v, want %v.", d, 1)
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}
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if d := origin3.Dist(unitZ3); math.Abs(d-1) > eps {
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t.Errorf("distance mismatch: have %v, want %v.", d, 1)
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}
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if d := origin3.Dist(diag3); math.Abs(d-math.Sqrt(3)) > eps {
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t.Errorf("distance mismatch: have %v, want %v.", d, math.Sqrt(3))
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}
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}
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func TestDistSqr3D(t *testing.T) {
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if d := origin3.DistSqr(unitX3); math.Abs(d-1) > eps {
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t.Errorf("squared distance mismatch: have %v, want %v.", d, 1)
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}
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if d := origin3.DistSqr(unitY3); math.Abs(d-1) > eps {
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t.Errorf("squared distance mismatch: have %v, want %v.", d, 1)
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}
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if d := origin3.DistSqr(unitZ3); math.Abs(d-1) > eps {
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t.Errorf("squared distance mismatch: have %v, want %v.", d, 1)
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}
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if d := origin3.DistSqr(diag3); math.Abs(d-3) > eps {
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t.Errorf("squared distance mismatch: have %v, want %v.", d, 3)
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}
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}
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func TestEqual3D(t *testing.T) {
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// Check X coordinate
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a, b, c := &Point3{0, 0, 0}, &Point3{0.999999 * eps, 0, 0}, &Point3{eps, 0, 0}
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if !a.Equal(b) {
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t.Errorf("equality should hold: %v == %v (given eps)", a, b)
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}
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if a.Equal(c) {
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t.Errorf("equality should not hold: %v == %v (given eps)", a, c)
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}
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// Check Y coordinate
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a, b, c = &Point3{0, 0, 0}, &Point3{0, 0.999999 * eps, 0}, &Point3{0, eps, 0}
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if !a.Equal(b) {
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t.Errorf("equality should hold: %v == %v (given eps)", a, b)
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}
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if a.Equal(c) {
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t.Errorf("equality should not hold: %v == %v (given eps)", a, c)
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}
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// Check Z coordinate
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a, b, c = &Point3{0, 0, 0}, &Point3{0, 0, 0.999999 * eps}, &Point3{0, 0, eps}
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if !a.Equal(b) {
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t.Errorf("equality should hold: %v == %v (given eps)", a, b)
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}
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if a.Equal(c) {
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t.Errorf("equality should not hold: %v == %v (given eps)", a, c)
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}
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}
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