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package rtree
import (
"fmt"
"math/rand"
"testing"
"time"
)
type tRect []float64
func (r *tRect) Arr() []float64 {
return []float64(*r)
}
func (r *tRect) Rect(ctx interface{}) (min, max []float64) {
return r.Arr()[:len(r.Arr())/2], r.Arr()[len(r.Arr())/2:]
}
func (r *tRect) String() string {
min, max := r.Rect(nil)
return fmt.Sprintf("%v,%v", min, max)
}
func tRandRect(dims int) *tRect {
if dims == -1 {
dims = rand.Int()%4 + 1
}
r := tRect(make([]float64, dims*2))
for j := 0; j < dims; j++ {
minf := rand.Float64()*200 - 100
maxf := rand.Float64()*200 - 100
if minf > maxf {
minf, maxf = maxf, minf
}
r[j] = minf
r[dims+j] = maxf
}
return &r
}
type tPoint struct {
x, y float64
}
func (r *tPoint) Rect(ctx interface{}) (min, max []float64) {
return []float64{r.x, r.y}, []float64{r.x, r.y}
}
func tRandPoint() *tPoint {
return &tPoint{
rand.Float64()*200 - 100,
rand.Float64()*200 - 100,
}
}
func TestRTree(t *testing.T) {
tr := New("hello")
zeroPoint := &tRect{0, 0, 0, 0}
tr.Insert(&tRect{10, 10, 10, 10, 20, 20, 20, 20})
tr.Insert(&tRect{10, 10, 10, 20, 20, 20})
tr.Insert(&tRect{10, 10, 20, 20})
tr.Insert(&tRect{10, 20})
tr.Insert(zeroPoint)
if tr.Count() != 5 {
t.Fatalf("expecting %v, got %v", 5, tr.Count())
}
var count int
tr.Search(&tRect{0, 0, 0, 100, 100, 5}, func(item Item) bool {
count++
return true
})
if count != 3 {
t.Fatalf("expecting %v, got %v", 3, count)
}
tr.Remove(zeroPoint)
count = 0
tr.Search(&tRect{0, 0, 0, 100, 100, 5}, func(item Item) bool {
count++
return true
})
if count != 2 {
t.Fatalf("expecting %v, got %v", 2, count)
}
}
func TestInsertDelete(t *testing.T) {
rand.Seed(time.Now().UnixNano())
n := 50000
tr := New(nil)
var r2arr []*tRect
for i := 0; i < n; i++ {
r := tRandRect(-1)
if len(r.Arr()) == 4 {
r2arr = append(r2arr, r)
}
tr.Insert(r)
}
if tr.Count() != n {
t.Fatalf("expecting %v, got %v", n, tr.Count())
}
var count int
tr.Search(&tRect{-100, -100, -100, -100, 100, 100, 100, 100}, func(item Item) bool {
if len(item.(*tRect).Arr()) == 4 {
count++
}
return true
})
p := float64(count) / float64(n)
if p < .23 || p > .27 {
t.Fatalf("bad random range, expected between 0.24-0.26, got %v", p)
}
for _, i := range rand.Perm(len(r2arr)) {
tr.Remove(r2arr[i])
}
total := tr.Count() + count
if total != n {
t.Fatalf("expected %v, got %v", n, total)
}
}
func TestPoints(t *testing.T) {
rand.Seed(time.Now().UnixNano())
n := 25000
tr := New(nil)
var points []*tPoint
for i := 0; i < n; i++ {
r := tRandPoint()
points = append(points, r)
tr.Insert(r)
}
if tr.Count() != n {
t.Fatalf("expecting %v, got %v", n, tr.Count())
}
var count int
tr.Search(&tRect{-100, -100, -100, -100, 100, 100, 100, 100}, func(item Item) bool {
count++
return true
})
if count != n {
t.Fatalf("expecting %v, got %v", n, count)
}
for _, i := range rand.Perm(len(points)) {
tr.Remove(points[i])
}
total := tr.Count() + count
if total != n {
t.Fatalf("expected %v, got %v", n, total)
}
}
func BenchmarkInsert(t *testing.B) {
t.StopTimer()
rand.Seed(time.Now().UnixNano())
tr := New(nil)
var points []*tPoint
for i := 0; i < t.N; i++ {
points = append(points, tRandPoint())
}
t.StartTimer()
for i := 0; i < t.N; i++ {
tr.Insert(points[i])
}
t.StopTimer()
count := tr.Count()
if count != t.N {
t.Fatalf("expected %v, got %v", t.N, count)
}
t.StartTimer()
}
func TestKNN(t *testing.T) {
n := 25000
tr := New(nil)
var points []*tPoint
rand.Seed(1)
for i := 0; i < n; i++ {
r := tRandPoint()
points = append(points, r)
tr.Insert(r)
}
if tr.Count() != n {
t.Fatalf("expecting %v, got %v", n, tr.Count())
}
var count int
tr.Search(&tRect{-100, -100, -100, -100, 100, 100, 100, 100}, func(item Item) bool {
count++
return true
})
var pdist float64
var i int
center := []float64{50, 50}
centerRect := &tRect{center[0], center[1], center[0], center[1]}
tr.KNN(centerRect, true, func(item Item, dist float64) bool {
dist2 := boxDistPoint(center, item)
if i > 0 && dist2 < pdist {
t.Fatal("out of order")
}
pdist = dist
i++
return true
})
if i != n {
t.Fatal("mismatch")
}
}
func boxDistPoint(point []float64, item Item) float64 {
var dist float64
min, max := item.Rect(nil)
for i := 0; i < len(point); i++ {
d := axisDist(point[i], min[i], max[i])
dist += d * d
}
return dist
}
func axisDist(k, min, max float64) float64 {
if k < min {
return min - k
}
if k <= max {
return 0
}
return k - max
}
|
