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// Copyright (c) 2017 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package geo
import (
"math"
"testing"
)
func TestMortonHashMortonUnhash(t *testing.T) {
tests := []struct {
lon float64
lat float64
}{
{-180.0, -90.0},
{-5, 27.3},
{0, 0},
{1.0, 1.0},
{24.7, -80.4},
{180.0, 90.0},
}
for _, test := range tests {
hash := MortonHash(test.lon, test.lat)
lon := MortonUnhashLon(hash)
lat := MortonUnhashLat(hash)
if compareGeo(test.lon, lon) != 0 {
t.Errorf("expected lon %f, got %f, hash %x", test.lon, lon, hash)
}
if compareGeo(test.lat, lat) != 0 {
t.Errorf("expected lat %f, got %f, hash %x", test.lat, lat, hash)
}
}
}
func TestScaleLonUnscaleLon(t *testing.T) {
tests := []struct {
lon float64
}{
{-180.0},
{0.0},
{1.0},
{180.0},
}
for _, test := range tests {
s := scaleLon(test.lon)
lon := unscaleLon(s)
if compareGeo(test.lon, lon) != 0 {
t.Errorf("expected %f, got %f, scaled was %d", test.lon, lon, s)
}
}
}
func TestScaleLatUnscaleLat(t *testing.T) {
tests := []struct {
lat float64
}{
{-90.0},
{0.0},
{1.0},
{90.0},
}
for _, test := range tests {
s := scaleLat(test.lat)
lat := unscaleLat(s)
if compareGeo(test.lat, lat) != 0 {
t.Errorf("expected %.16f, got %.16f, scaled was %d", test.lat, lat, s)
}
}
}
func TestRectFromPointDistance(t *testing.T) {
// at the equator 1 degree of latitude is about 110567 meters
_, upperLeftLat, _, lowerRightLat, err := RectFromPointDistance(0, 0, 110567)
if err != nil {
t.Fatal(err)
}
if math.Abs(upperLeftLat-1) > 1E-2 {
t.Errorf("expected bounding box upper left lat to be almost 1, got %f", upperLeftLat)
}
if math.Abs(lowerRightLat+1) > 1E-2 {
t.Errorf("expected bounding box lower right lat to be almost -1, got %f", lowerRightLat)
}
}
func TestRectIntersects(t *testing.T) {
tests := []struct {
aMinX float64
aMinY float64
aMaxX float64
aMaxY float64
bMinX float64
bMinY float64
bMaxX float64
bMaxY float64
want bool
}{
// clearly overlap
{0, 0, 2, 2, 1, 1, 3, 3, true},
// clearly do not overalp
{0, 0, 1, 1, 2, 2, 3, 3, false},
// share common point
{0, 0, 1, 1, 1, 1, 2, 2, true},
}
for _, test := range tests {
got := RectIntersects(test.aMinX, test.aMinY, test.aMaxX, test.aMaxY, test.bMinX, test.bMinY, test.bMaxX, test.bMaxY)
if test.want != got {
t.Errorf("expected intersects %t, got %t for %f %f %f %f %f %f %f %f", test.want, got, test.aMinX, test.aMinY, test.aMaxX, test.aMaxY, test.bMinX, test.bMinY, test.bMaxX, test.bMaxY)
}
}
}
func TestRectWithin(t *testing.T) {
tests := []struct {
aMinX float64
aMinY float64
aMaxX float64
aMaxY float64
bMinX float64
bMinY float64
bMaxX float64
bMaxY float64
want bool
}{
// clearly within
{1, 1, 2, 2, 0, 0, 3, 3, true},
// clearly not within
{0, 0, 1, 1, 2, 2, 3, 3, false},
// overlapping
{0, 0, 2, 2, 1, 1, 3, 3, false},
// share common point
{0, 0, 1, 1, 1, 1, 2, 2, false},
// within, but boxes reversed (b is within a, but not a within b)
{0, 0, 3, 3, 1, 1, 2, 2, false},
}
for _, test := range tests {
got := RectWithin(test.aMinX, test.aMinY, test.aMaxX, test.aMaxY, test.bMinX, test.bMinY, test.bMaxX, test.bMaxY)
if test.want != got {
t.Errorf("expected within %t, got %t for %f %f %f %f %f %f %f %f", test.want, got, test.aMinX, test.aMinY, test.aMaxX, test.aMaxY, test.bMinX, test.bMinY, test.bMaxX, test.bMaxY)
}
}
}
func TestBoundingBoxContains(t *testing.T) {
tests := []struct {
lon float64
lat float64
minX float64
minY float64
maxX float64
maxY float64
want bool
}{
// clearly contains
{1, 1, 0, 0, 2, 2, true},
// clearly does not contain
{0, 0, 1, 1, 2, 2, false},
// on corner
{0, 0, 0, 0, 2, 2, true},
}
for _, test := range tests {
got := BoundingBoxContains(test.lon, test.lat, test.minX, test.minY, test.maxX, test.maxY)
if test.want != got {
t.Errorf("expected box contains %t, got %t for %f,%f in %f %f %f %f ", test.want, got, test.lon, test.lat, test.minX, test.minY, test.maxX, test.maxY)
}
}
}
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