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cut_test.go
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package topojson
import (
"reflect"
"testing"
"github.com/cheekybits/is"
"github.com/paulmach/go.geojson"
)
// See https://github.com/mbostock/topojson/blob/master/test/topology/cut-test.js
// cut exact duplicate lines ABC & ABC have no cuts
func TestCutDuplicates(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
NewTestFeature("abc2", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abc")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 2)
is.Nil(o1.Arc.Next)
o2 := GetFeature(topo, "abc2")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 5)
is.Nil(o2.Arc.Next)
}
// cut reversed duplicate lines ABC & CBA have no cuts
func TestCutReversedDuplicates(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
NewTestFeature("cba", geojson.NewLineStringGeometry([][]float64{
{2, 0}, {1, 0}, {0, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abc")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 2)
is.Nil(o1.Arc.Next)
o2 := GetFeature(topo, "cba")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 5)
is.Nil(o2.Arc.Next)
}
// cut exact duplicate rings ABCA & ABCA have no cuts
func TestCutDuplicateRings(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abca", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {1, 0}, {2, 0}, {0, 0},
},
})),
NewTestFeature("abca2", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {1, 0}, {2, 0}, {0, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abca")
is.Equal(o1.Type, geojson.GeometryPolygon)
is.Equal(len(o1.Arcs), 1)
is.Equal(o1.Arcs[0].Start, 0)
is.Equal(o1.Arcs[0].End, 3)
is.Nil(o1.Arcs[0].Next)
o2 := GetFeature(topo, "abca2")
is.Equal(o2.Type, geojson.GeometryPolygon)
is.Equal(len(o2.Arcs), 1)
is.Equal(o2.Arcs[0].Start, 4)
is.Equal(o2.Arcs[0].End, 7)
is.Nil(o2.Arcs[0].Next)
}
// cut reversed duplicate rings ACBA & ABCA have no cuts
func TestCutReversedDuplicateRings(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abca", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {1, 0}, {2, 0}, {0, 0},
},
})),
NewTestFeature("acba", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {2, 0}, {1, 0}, {0, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abca")
is.Equal(o1.Type, geojson.GeometryPolygon)
is.Equal(len(o1.Arcs), 1)
is.Equal(o1.Arcs[0].Start, 0)
is.Equal(o1.Arcs[0].End, 3)
is.Nil(o1.Arcs[0].Next)
o2 := GetFeature(topo, "acba")
is.Equal(o2.Type, geojson.GeometryPolygon)
is.Equal(len(o2.Arcs), 1)
is.Equal(o2.Arcs[0].Start, 4)
is.Equal(o2.Arcs[0].End, 7)
is.Nil(o2.Arcs[0].Next)
}
// cut rotated duplicate rings BCAB & ABCA have no cuts
func TestCutRotatedDuplicateRings(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abca", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {1, 0}, {2, 0}, {0, 0},
},
})),
NewTestFeature("bcab", geojson.NewPolygonGeometry([][][]float64{
{
{1, 0}, {2, 0}, {0, 0}, {1, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abca")
is.Equal(o1.Type, geojson.GeometryPolygon)
is.Equal(len(o1.Arcs), 1)
is.Equal(o1.Arcs[0].Start, 0)
is.Equal(o1.Arcs[0].End, 3)
is.Nil(o1.Arcs[0].Next)
o2 := GetFeature(topo, "bcab")
is.Equal(o2.Type, geojson.GeometryPolygon)
is.Equal(len(o2.Arcs), 1)
is.Equal(o2.Arcs[0].Start, 4)
is.Equal(o2.Arcs[0].End, 7)
is.Nil(o2.Arcs[0].Next)
}
// cut ring ABCA & line ABCA have no cuts
func TestCutRingLine(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abcaLine", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0}, {0, 0},
})),
NewTestFeature("abcaPolygon", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {1, 0}, {2, 0}, {0, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abcaLine")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 3)
is.Nil(o1.Arc.Next)
o2 := GetFeature(topo, "abcaPolygon")
is.Equal(o2.Type, geojson.GeometryPolygon)
is.Equal(len(o2.Arcs), 1)
is.Equal(o2.Arcs[0].Start, 4)
is.Equal(o2.Arcs[0].End, 7)
is.Nil(o2.Arcs[0].Next)
}
// cut ring BCAB & line ABCA have no cuts
func TestCutRingLineReversed(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abcaLine", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0}, {0, 0},
})),
NewTestFeature("bcabPolygon", geojson.NewPolygonGeometry([][][]float64{
{
{1, 0}, {2, 0}, {0, 0}, {1, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abcaLine")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 3)
is.Nil(o1.Arc.Next)
o2 := GetFeature(topo, "bcabPolygon")
is.Equal(o2.Type, geojson.GeometryPolygon)
is.Equal(len(o2.Arcs), 1)
is.Equal(o2.Arcs[0].Start, 4)
is.Equal(o2.Arcs[0].End, 7)
is.Nil(o2.Arcs[0].Next)
}
// cut ring ABCA & line BCAB have no cuts
func TestCutRingLineReversed2(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("bcabLine", geojson.NewLineStringGeometry([][]float64{
{1, 0}, {2, 0}, {0, 0}, {1, 0},
})),
NewTestFeature("abcaPolygon", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {1, 0}, {2, 0}, {0, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "bcabLine")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 3)
is.Nil(o1.Arc.Next)
o2 := GetFeature(topo, "abcaPolygon")
is.Equal(o2.Type, geojson.GeometryPolygon)
is.Equal(len(o2.Arcs), 1)
is.Equal(o2.Arcs[0].Start, 4)
is.Equal(o2.Arcs[0].End, 7)
is.Nil(o2.Arcs[0].Next)
}
// cut when an old arc ABC extends a new arc AB, ABC is cut into AB-BC
func TestCutOldArcExtends(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
NewTestFeature("ab", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abc")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Equal(o1.Arc.Next.Start, 1)
is.Equal(o1.Arc.Next.End, 2)
is.Nil(o1.Arc.Next.Next)
o2 := GetFeature(topo, "ab")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 4)
is.Nil(o2.Arc.Next)
}
// cut when a reversed old arc CBA extends a new arc AB, CBA is cut into CB-BA
func TestCutReversedOldArcExtends(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("cba", geojson.NewLineStringGeometry([][]float64{
{2, 0}, {1, 0}, {0, 0},
})),
NewTestFeature("ab", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "cba")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Equal(o1.Arc.Next.Start, 1)
is.Equal(o1.Arc.Next.End, 2)
is.Nil(o1.Arc.Next.Next)
o2 := GetFeature(topo, "ab")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 4)
is.Nil(o2.Arc.Next)
}
// cut when a new arc ADE shares its start with an old arc ABC, there are no cuts
func TestCutNewArcSharesStart(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("ade", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 1}, {2, 1},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "ade")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 2)
is.Nil(o1.Arc.Next)
o2 := GetFeature(topo, "abc")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 5)
is.Nil(o2.Arc.Next)
}
// cut ring ABA has no junctions
func TestCutRingNoCuts(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("aba", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {1, 0}, {0, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "aba")
is.Equal(o1.Type, geojson.GeometryPolygon)
is.Equal(len(o1.Arcs), 1)
is.Equal(o1.Arcs[0].Start, 0)
is.Equal(o1.Arcs[0].End, 2)
is.Nil(o1.Arcs[0].Next)
}
// cut ring AA has no cuts
func TestCutRingAANoCuts(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("aa", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {0, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "aa")
is.Equal(o1.Type, geojson.GeometryPolygon)
is.Equal(len(o1.Arcs), 1)
is.Equal(o1.Arcs[0].Start, 0)
is.Equal(o1.Arcs[0].End, 1)
is.Nil(o1.Arcs[0].Next)
}
// cut degenerate ring A has no cuts
func TestCutRingANoCuts(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("a", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "a")
is.Equal(o1.Type, geojson.GeometryPolygon)
is.Equal(len(o1.Arcs), 1)
is.Equal(o1.Arcs[0].Start, 0)
is.Equal(o1.Arcs[0].End, 0)
is.Nil(o1.Arcs[0].Next)
}
// cut when a new line DEC shares its end with an old line ABC, there are no cuts
func TestCutNewLineSharesEnd(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
NewTestFeature("dec", geojson.NewLineStringGeometry([][]float64{
{0, 1}, {1, 1}, {2, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abc")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 2)
is.Nil(o1.Arc.Next)
o2 := GetFeature(topo, "dec")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 5)
is.Nil(o2.Arc.Next)
}
// cut when a new line ABC extends an old line AB, ABC is cut into AB-BC
func TestCutNewLineExtends(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("ab", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0},
})),
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "ab")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Nil(o1.Arc.Next)
o2 := GetFeature(topo, "abc")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 2)
is.Equal(o2.Arc.End, 3)
is.Equal(o2.Arc.Next.Start, 3)
is.Equal(o2.Arc.Next.End, 4)
is.Nil(o2.Arc.Next.Next)
}
// cut when a new line ABC extends a reversed old line BA, ABC is cut into AB-BC
func TestCutNewLineExtendsReversed(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("ba", geojson.NewLineStringGeometry([][]float64{
{1, 0}, {0, 0},
})),
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "ba")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Nil(o1.Arc.Next)
o2 := GetFeature(topo, "abc")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 2)
is.Equal(o2.Arc.End, 3)
is.Equal(o2.Arc.Next.Start, 3)
is.Equal(o2.Arc.Next.End, 4)
is.Nil(o2.Arc.Next.Next)
}
// cut when a new line starts BC in the middle of an old line ABC, ABC is cut into AB-BC
func TestCutNewStartsMiddle(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
NewTestFeature("bc", geojson.NewLineStringGeometry([][]float64{
{1, 0}, {2, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abc")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Equal(o1.Arc.Next.Start, 1)
is.Equal(o1.Arc.Next.End, 2)
is.Nil(o1.Arc.Next.Next)
o2 := GetFeature(topo, "bc")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 4)
is.Nil(o2.Arc.Next)
}
// cut when a new line BC starts in the middle of a reversed old line CBA, CBA is cut into CB-BA
func TestCutNewStartsMiddleReversed(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("cba", geojson.NewLineStringGeometry([][]float64{
{2, 0}, {1, 0}, {0, 0},
})),
NewTestFeature("bc", geojson.NewLineStringGeometry([][]float64{
{1, 0}, {2, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "cba")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Equal(o1.Arc.Next.Start, 1)
is.Equal(o1.Arc.Next.End, 2)
is.Nil(o1.Arc.Next.Next)
o2 := GetFeature(topo, "bc")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 4)
is.Nil(o2.Arc.Next)
}
// cut when a new line ABD deviates from an old line ABC, ABD is cut into AB-BD and ABC is cut into AB-BC
func TestCutNewLineDeviates(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
NewTestFeature("abd", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {3, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abc")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Equal(o1.Arc.Next.Start, 1)
is.Equal(o1.Arc.Next.End, 2)
is.Nil(o1.Arc.Next.Next)
o2 := GetFeature(topo, "abd")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 4)
is.Equal(o2.Arc.Next.Start, 4)
is.Equal(o2.Arc.Next.End, 5)
is.Nil(o2.Arc.Next.Next)
}
// cut when a new line ABD deviates from a reversed old line CBA, CBA is cut into CB-BA and ABD is cut into AB-BD
func TestCutNewLineDeviatesReversed(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("cba", geojson.NewLineStringGeometry([][]float64{
{2, 0}, {1, 0}, {0, 0},
})),
NewTestFeature("abd", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {3, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "cba")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Equal(o1.Arc.Next.Start, 1)
is.Equal(o1.Arc.Next.End, 2)
is.Nil(o1.Arc.Next.Next)
o2 := GetFeature(topo, "abd")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 4)
is.Equal(o2.Arc.Next.Start, 4)
is.Equal(o2.Arc.Next.End, 5)
is.Nil(o2.Arc.Next.Next)
}
// cut when a new line DBC merges into an old line ABC, DBC is cut into DB-BC and ABC is cut into AB-BC
func TestCutNewLineMerges(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
NewTestFeature("dbc", geojson.NewLineStringGeometry([][]float64{
{3, 0}, {1, 0}, {2, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abc")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Equal(o1.Arc.Next.Start, 1)
is.Equal(o1.Arc.Next.End, 2)
is.Nil(o1.Arc.Next.Next)
o2 := GetFeature(topo, "dbc")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 4)
is.Equal(o2.Arc.Next.Start, 4)
is.Equal(o2.Arc.Next.End, 5)
is.Nil(o2.Arc.Next.Next)
}
// cut when a new line DBC merges into a reversed old line CBA, DBC is cut into DB-BC and CBA is cut into CB-BA
func TestCutNewLineMergesReversed(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("cba", geojson.NewLineStringGeometry([][]float64{
{2, 0}, {1, 0}, {0, 0},
})),
NewTestFeature("dbc", geojson.NewLineStringGeometry([][]float64{
{3, 0}, {1, 0}, {2, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "cba")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Equal(o1.Arc.Next.Start, 1)
is.Equal(o1.Arc.Next.End, 2)
is.Nil(o1.Arc.Next.Next)
o2 := GetFeature(topo, "dbc")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 4)
is.Equal(o2.Arc.Next.Start, 4)
is.Equal(o2.Arc.Next.End, 5)
is.Nil(o2.Arc.Next.Next)
}
// cut when a new line DBE shares a single midpoint with an old line ABC, DBE is cut into DB-BE and ABC is cut into AB-BC
func TestCutNewLineSharesMidpoint(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abc", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0},
})),
NewTestFeature("dbe", geojson.NewLineStringGeometry([][]float64{
{0, 1}, {1, 0}, {2, 1},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abc")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
is.Equal(o1.Arc.Next.Start, 1)
is.Equal(o1.Arc.Next.End, 2)
is.Nil(o1.Arc.Next.Next)
o2 := GetFeature(topo, "dbe")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 3)
is.Equal(o2.Arc.End, 4)
is.Equal(o2.Arc.Next.Start, 4)
is.Equal(o2.Arc.Next.End, 5)
is.Nil(o2.Arc.Next.Next)
}
// cut when a new line ABDE skips a point with an old line ABCDE, ABDE is cut into AB-BD-DE and ABCDE is cut into AB-BCD-DE
func TestCutNewLineSkipsPoint(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abcde", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0}, {3, 0}, {4, 0},
})),
NewTestFeature("adbe", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {3, 0}, {4, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abcde")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
o1Next := o1.Arc.Next
is.Equal(o1Next.Start, 1)
is.Equal(o1Next.End, 3)
is.Equal(o1Next.Next.Start, 3)
is.Equal(o1Next.Next.End, 4)
is.Nil(o1Next.Next.Next)
o2 := GetFeature(topo, "adbe")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 5)
is.Equal(o2.Arc.End, 6)
o2Next := o2.Arc.Next
is.Equal(o2Next.Start, 6)
is.Equal(o2Next.End, 7)
is.Equal(o2Next.Next.Start, 7)
is.Equal(o2Next.Next.End, 8)
is.Nil(o2Next.Next.Next)
}
// cut when a new line ABDE skips a point with a reversed old line EDCBA, ABDE is cut into AB-BD-DE and EDCBA is cut into ED-DCB-BA
func TestCutNewLineSkipsPointReversed(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("edcba", geojson.NewLineStringGeometry([][]float64{
{4, 0}, {3, 0}, {2, 0}, {1, 0}, {0, 0},
})),
NewTestFeature("adbe", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {3, 0}, {4, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "edcba")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
o1Next := o1.Arc.Next
is.Equal(o1Next.Start, 1)
is.Equal(o1Next.End, 3)
is.Equal(o1Next.Next.Start, 3)
is.Equal(o1Next.Next.End, 4)
is.Nil(o1Next.Next.Next)
o2 := GetFeature(topo, "adbe")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 5)
is.Equal(o2.Arc.End, 6)
o2Next := o2.Arc.Next
is.Equal(o2Next.Start, 6)
is.Equal(o2Next.End, 7)
is.Equal(o2Next.Next.Start, 7)
is.Equal(o2Next.Next.End, 8)
is.Nil(o2Next.Next.Next)
}
// cut when a line ABCDBE self-intersects with its middle, it is not cut
func TestCutSelfIntersectsMiddle(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abcdbe", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0}, {3, 0}, {1, 0}, {4, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abcdbe")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 5)
is.Nil(o1.Arc.Next)
}
// cut when a line ABACD self-intersects with its start, it is cut into ABA-ACD
func TestCutSelfIntersectsStart(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abacd", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {0, 0}, {3, 0}, {4, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abacd")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 2)
is.Equal(o1.Arc.Next.Start, 2)
is.Equal(o1.Arc.Next.End, 4)
is.Nil(o1.Arc.Next.Next)
}
// cut when a line ABDCD self-intersects with its end, it is cut into ABD-DCD
func TestCutSelfIntersectsEnd(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abcdbd", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {4, 0}, {3, 0}, {4, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abcdbd")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 2)
is.Equal(o1.Arc.Next.Start, 2)
is.Equal(o1.Arc.Next.End, 4)
is.Nil(o1.Arc.Next.Next)
}
// cut when an old line ABCDBE self-intersects and shares a point B, ABCDBE is cut into AB-BCDB-BE and FBG is cut into FB-BG
func TestCutSelfIntersectsShares(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abcdbe", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {2, 0}, {3, 0}, {1, 0}, {4, 0},
})),
NewTestFeature("fbg", geojson.NewLineStringGeometry([][]float64{
{0, 1}, {1, 0}, {2, 1},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abcdbe")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 1)
o1Next := o1.Arc.Next
is.Equal(o1Next.Start, 1)
is.Equal(o1Next.End, 4)
is.Equal(o1Next.Next.Start, 4)
is.Equal(o1Next.Next.End, 5)
is.Nil(o1Next.Next.Next)
o2 := GetFeature(topo, "fbg")
is.Equal(o2.Type, geojson.GeometryLineString)
is.Equal(o2.Arc.Start, 6)
is.Equal(o2.Arc.End, 7)
is.Equal(o2.Arc.Next.Start, 7)
is.Equal(o2.Arc.Next.End, 8)
is.Nil(o2.Arc.Next.Next)
}
// cut when a line ABCA is closed, there are no cuts
func TestCutLineClosed(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abca", geojson.NewLineStringGeometry([][]float64{
{0, 0}, {1, 0}, {0, 1}, {0, 0},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abca")
is.Equal(o1.Type, geojson.GeometryLineString)
is.Equal(o1.Arc.Start, 0)
is.Equal(o1.Arc.End, 3)
is.Nil(o1.Arc.Next)
}
// cut when a ring ABCA is closed, there are no cuts
func TestCutRingClosed(t *testing.T) {
is := is.New(t)
in := []*geojson.Feature{
NewTestFeature("abca", geojson.NewPolygonGeometry([][][]float64{
{
{0, 0}, {1, 0}, {0, 1}, {0, 0},
},
})),
}
topo := &Topology{input: in}
topo.extract()
topo.cut()
o1 := GetFeature(topo, "abca")
is.Equal(o1.Type, geojson.GeometryPolygon)
is.Equal(len(o1.Arcs), 1)
is.Equal(o1.Arcs[0].Start, 0)
is.Equal(o1.Arcs[0].End, 3)
is.Nil(o1.Arcs[0].Next)