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package length
import (
"math"
"testing"
"github.com/paulmach/orb"
)
func Distance(a, b orb.Point) float64 {
dx := a[0] - b[0]
dy := a[1] - b[1]
return math.Sqrt(dx*dx + dy*dy)
}
func TestLength(t *testing.T) {
for _, g := range orb.AllGeometries {
// should not panic with unsupported type
Length(g, Distance)
}
ls := orb.LineString{{0, 0}, {3, 0}, {3, 4}, {0, 0}}
if l := Length(ls, Distance); l != 12 {
t.Errorf("incorrect length: %v != %v", l, 12)
}
mls := orb.MultiLineString{
{{0, 0}, {3, 0}, {3, 4}, {0, 0}},
{{5, 0}, {5, 7}},
}
if l := Length(mls, Distance); l != 19 {
t.Errorf("incorrect length: %v != %v", l, 19)
}
p := orb.Polygon{{{0, 0}, {3, 0}, {3, 4}, {0, 0}}}
if l := Length(p, Distance); l != 12 {
t.Errorf("incorrect length: %v != %v", l, 12)
}
mp := orb.MultiPolygon{
{{{0, 0}, {3, 0}, {3, 4}, {0, 0}}},
{{{5, 0}, {8, 0}, {8, 4}, {5, 0}}},
}
if l := Length(mp, Distance); l != 24 {
t.Errorf("incorrect length: %v != %v", l, 24)
}
}
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