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package planar
import (
"math"
"testing"
"github.com/paulmach/orb"
)
var epsilon = 1e-6
func TestDistanceFromSegment(t *testing.T) {
a := orb.Point{0, 0}
b := orb.Point{0, 10}
cases := []struct {
name string
point orb.Point
result float64
}{
{
name: "point in middle",
point: orb.Point{1, 5},
result: 1,
},
{
name: "on line",
point: orb.Point{0, 2},
result: 0,
},
{
name: "past start",
point: orb.Point{0, -5},
result: 5,
},
{
name: "past end",
point: orb.Point{0, 13},
result: 3,
},
{
name: "triangle",
point: orb.Point{3, 4},
result: 3,
},
{
name: "triangle off end",
point: orb.Point{3, -4},
result: 5,
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
v := DistanceFromSegment(a, b, tc.point)
if v != tc.result {
t.Errorf("incorrect distance: %v != %v", v, tc.result)
}
})
}
}
func TestDistanceFromWithIndex(t *testing.T) {
for _, g := range orb.AllGeometries {
DistanceFromWithIndex(g, orb.Point{})
}
}
func TestDistanceFrom_MultiPoint(t *testing.T) {
mp := orb.MultiPoint{{0.0}, {1, 1}, {2, 2}}
fromPoint := orb.Point{3, 2}
if distance := DistanceFrom(mp, fromPoint); distance != 1 {
t.Errorf("distance incorrect: %v != %v", distance, 1)
}
}
func TestDistanceFrom_LineString(t *testing.T) {
ls := orb.LineString{{0, 0}, {0, 3}, {4, 3}, {4, 0}}
cases := []struct {
name string
point orb.Point
result float64
}{
{
point: orb.Point{4.5, 1.5},
result: 0.5,
},
{
point: orb.Point{0.4, 1.5},
result: 0.4,
},
{
point: orb.Point{-0.3, 1.5},
result: 0.3,
},
{
point: orb.Point{0.3, 2.8},
result: 0.2,
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
d := DistanceFrom(ls, tc.point)
if math.Abs(d-tc.result) > epsilon {
t.Errorf("incorrect distance: %v != %v", d, tc.result)
}
})
}
}
func TestDistanceFrom_Polygon(t *testing.T) {
r1 := orb.Ring{{0, 0}, {3, 0}, {3, 3}, {0, 3}, {0, 0}}
r2 := orb.Ring{{1, 1}, {2, 1}, {2, 2}, {1, 2}, {1, 1}}
poly := orb.Polygon{r1, r2}
cases := []struct {
name string
point orb.Point
result float64
}{
{
name: "outside",
point: orb.Point{-1, 2},
result: 1,
},
{
name: "inside",
point: orb.Point{0.4, 2},
result: 0.4,
},
{
name: "in hole",
point: orb.Point{1.3, 1.4},
result: 0.3,
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
if d := DistanceFrom(poly, tc.point); math.Abs(d-tc.result) > epsilon {
t.Errorf("incorrect distance: %v != %v", d, tc.result)
}
})
}
}
|
