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segment_test.go
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segment_test.go
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package polygol
import (
"testing"
)
func equalRingIn(r1 []*ringIn, r2 []*ringIn) bool {
if len(r1) != len(r2) {
return false
}
for i := range r1 {
if r1[i] != r2[i] {
return false
}
}
return true
}
func equalWinding(w1, w2 []int) bool {
if len(w1) != len(w2) {
return false
}
for i := range w1 {
if w1[i] != w2[i] {
return false
}
}
return true
}
func equalVector(v1, v2 []float64) bool {
if len(v1) != len(v2) {
return false
}
for i := range v1 {
if v1[i] != v2[i] {
return false
}
}
return true
}
func TestSegmentNew(t *testing.T) {
t.Parallel()
var leftSE, rightSE *sweepEvent
op := newOperation("")
// general
leftSE = newSweepEvent(newPoint(0, 0), true)
rightSE = newSweepEvent(newPoint(1, 1), false)
rings := []*ringIn{}
windings := []int{}
seg := op.newSegment(leftSE, rightSE, rings, windings)
expect(t, equalRingIn(seg.rings, rings))
expect(t, equalWinding(seg.windings, windings))
expect(t, seg.leftSE == leftSE)
expect(t, seg.leftSE.otherSE == rightSE)
expect(t, seg.rightSE == rightSE)
expect(t, seg.rightSE.otherSE == leftSE)
expect(t, seg.ringOut == nil)
expect(t, seg.prev == nil)
expect(t, seg.consumedBy == nil)
// segment Id increments
leftSE = newSweepEvent(&point{x: 0, y: 0}, true)
rightSE = newSweepEvent(&point{x: 1, y: 1}, false)
seg1 := op.newSegment(leftSE, rightSE, []*ringIn{}, nil)
seg2 := op.newSegment(leftSE, rightSE, []*ringIn{}, nil)
expect(t, seg2.id-seg1.id == 1)
}
func TestSegmentNewFromRing(t *testing.T) {
t.Parallel()
var p1, p2 *point
var seg *segment
var err error
op := newOperation("")
// correct point on left and right 1
p1, p2 = &point{x: 0, y: 0}, &point{x: 0, y: 1}
seg, err = op.newSegmentFromRing(p1, p2, &ringIn{})
terr(t, err)
expect(t, seg.leftSE.point.equal(*p1))
expect(t, seg.rightSE.point.equal(*p2))
// correct point on left and right 1
p1, p2 = &point{x: 0, y: 0}, &point{x: -1, y: 0}
seg, err = op.newSegmentFromRing(p1, p2, nil)
terr(t, err)
expect(t, seg.leftSE.point.equal(*p2))
expect(t, seg.rightSE.point.equal(*p1))
// attempt create segment with same points
p1, p2 = &point{x: 0, y: 0}, &point{x: 0, y: 0}
seg, err = op.newSegmentFromRing(p1, p2, nil)
expect(t, err != nil)
}
func TestSegmentSplit(t *testing.T) {
t.Parallel()
var seg *segment
var pt *point
var evt, otherEvt *sweepEvent
var evts []*sweepEvent
var err error
op := newOperation("")
// on interior point
seg, err = op.newSegmentFromRing(newPoint(0, 0), newPoint(10, 10), nil)
terr(t, err)
pt = &point{x: 5, y: 5}
evts = seg.split(pt)
expect(t, evts[0].segment == seg)
expect(t, evts[0].point.equal(*pt))
expect(t, !evts[0].isLeft)
expect(t, evts[0].otherSE.otherSE == evts[0])
expect(t, evts[1].segment.leftSE.segment == evts[1].segment)
expect(t, evts[1].segment != seg)
expect(t, evts[1].point.equal(*pt))
expect(t, evts[1].isLeft)
expect(t, evts[1].otherSE.otherSE == evts[1])
expect(t, evts[1].segment.rightSE.segment == evts[1].segment)
// on close-to-but-not-exactly interior point
seg, err = op.newSegmentFromRing(&point{x: 0, y: 10}, &point{x: 10, y: 0}, nil)
terr(t, err)
pt = &point{x: 5 + epsilon, y: 5}
evts = seg.split(pt)
expect(t, evts[0].segment == seg)
expect(t, evts[0].point.equal(*pt))
expect(t, !evts[0].isLeft)
expect(t, evts[1].segment != seg)
expect(t, evts[1].point.equal(*pt))
expect(t, evts[1].isLeft)
expect(t, evts[1].segment.rightSE.segment == evts[1].segment)
// on three interior points
seg, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 10, y: 0}, nil)
terr(t, err)
sPt1, sPt2, sPt3 := &point{x: 2, y: 2}, &point{x: 4, y: 4}, &point{x: 6, y: 6}
orgLeftEvt, orgRightEvt := seg.leftSE, seg.rightSE
newEvts3 := seg.split(sPt3)
newEvts2 := seg.split(sPt2)
newEvts1 := seg.split(sPt1)
newEvts := append(newEvts1, newEvts2...)
newEvts = append(newEvts, newEvts3...)
expect(t, len(newEvts) == 6)
expect(t, seg.leftSE == orgLeftEvt)
for _, e := range newEvts {
if e.point == sPt1 && !e.isLeft {
evt = e
break
}
}
expect(t, seg.rightSE == evt)
for _, e := range newEvts {
if e.point == sPt1 && e.isLeft {
evt = e
break
}
}
for _, e := range newEvts {
if e.point == sPt2 && !e.isLeft {
otherEvt = e
break
}
}
expect(t, evt.segment == otherEvt.segment)
for _, e := range newEvts {
if e.point == sPt2 && e.isLeft {
evt = e
break
}
}
for _, e := range newEvts {
if e.point.equal(*sPt3) && !e.isLeft {
otherEvt = e
break
}
}
expect(t, evt.segment == otherEvt.segment)
for _, e := range newEvts {
if e.point.equal(*sPt3) && e.isLeft {
evt = e
break
}
}
expect(t, evt.segment == orgRightEvt.segment)
}
func TestSegmentSimplePropertiesBboxVector(t *testing.T) {
t.Parallel()
var seg *segment
var err error
op := newOperation("")
// general
seg, err = op.newSegmentFromRing(&point{x: 1, y: 2}, &point{x: 3, y: 4}, nil)
terr(t, err)
expect(t, equalBbox(seg.bbox(), bbox{ll: point{x: 1, y: 2}, ur: point{x: 3, y: 4}}))
expect(t, equalVector(seg.vector(), []float64{2, 2}))
// horizontal
seg, err = op.newSegmentFromRing(&point{x: 1, y: 4}, &point{x: 3, y: 4}, nil)
terr(t, err)
expect(t, equalBbox(seg.bbox(), bbox{ll: point{x: 1, y: 4}, ur: point{x: 3, y: 4}}))
expect(t, equalVector(seg.vector(), []float64{2, 0}))
// vertical
seg, err = op.newSegmentFromRing(&point{x: 3, y: 2}, &point{x: 3, y: 4}, nil)
terr(t, err)
expect(t, equalBbox(seg.bbox(), bbox{ll: point{x: 3, y: 2}, ur: point{x: 3, y: 4}}))
expect(t, equalVector(seg.vector(), []float64{0, 2}))
}
func TestSegmentConsume(t *testing.T) {
t.Parallel()
var p1, p2 *point
var seg1, seg2 *segment
var err error
op := newOperation("")
// not automatically consumed
p1, p2 = &point{x: 0, y: 0}, &point{x: 1, y: 0}
seg1, err = op.newSegmentFromRing(p1, p2, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(p1, p2, nil)
terr(t, err)
expect(t, seg1.consumedBy == nil)
expect(t, seg2.consumedBy == nil)
// basic case
p1, p2 = &point{x: 0, y: 0}, &point{x: 1, y: 0}
seg1, err = op.newSegmentFromRing(p1, p2, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(p1, p2, nil)
terr(t, err)
seg1.consume(seg2)
expect(t, seg2.consumedBy == seg1)
expect(t, seg1.consumedBy == nil)
// earlier in sweep line sorting consumes later
p1, p2 = &point{x: 0, y: 0}, &point{x: 1, y: 0}
seg1, err = op.newSegmentFromRing(p1, p2, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(p1, p2, nil)
terr(t, err)
seg2.consume(seg1)
expect(t, seg2.consumedBy == seg1)
expect(t, seg1.consumedBy == nil)
// consuming cascades
p1, p2 = &point{x: 0, y: 0}, &point{x: 0, y: 0}
p3, p4 := &point{x: 1, y: 0}, &point{x: 1, y: 0}
seg1, err = op.newSegmentFromRing(p1, p3, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(p1, p3, nil)
terr(t, err)
seg3, err := op.newSegmentFromRing(p2, p4, nil)
terr(t, err)
seg4, err := op.newSegmentFromRing(p2, p4, nil)
terr(t, err)
seg5, err := op.newSegmentFromRing(p2, p4, nil)
terr(t, err)
seg1.consume(seg2)
seg4.consume(seg2)
seg3.consume(seg2)
seg3.consume(seg5)
expect(t, seg1.consumedBy == nil)
expect(t, seg2.consumedBy == seg1)
expect(t, seg3.consumedBy == seg1)
expect(t, seg4.consumedBy == seg1)
expect(t, seg5.consumedBy == seg1)
}
func TestSegmentIsAnEndpoint(t *testing.T) {
t.Parallel()
op := newOperation("")
p1, p2 := &point{x: 0, y: -1}, &point{x: 1, y: 0}
seg, err := op.newSegmentFromRing(p1, p2, nil)
terr(t, err)
// yup
expect(t, seg.isAnEndpoint(p1))
expect(t, seg.isAnEndpoint(p2))
// nope
expect(t, !seg.isAnEndpoint(&point{x: -34, y: 46}))
expect(t, !seg.isAnEndpoint(&point{x: 0, y: 0}))
}
func TestSegmentComparisonWithPoint(t *testing.T) {
t.Parallel()
var seg *segment
var err error
var pt *point
op := newOperation("")
t.Run("general", func(t *testing.T) {
seg1, err := op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err := op.newSegmentFromRing(&point{x: 0, y: 1}, &point{x: 0, y: 0}, nil)
terr(t, err)
expect(t, seg1.comparePoint(&point{x: 0, y: 1}) == 1)
expect(t, seg1.comparePoint(&point{x: 1, y: 2}) == 1)
expect(t, seg1.comparePoint(&point{x: 0, y: 0}) == 0)
expect(t, seg1.comparePoint(&point{x: 5, y: -1}) == -1)
expect(t, seg2.comparePoint(&point{x: 0, y: 1}) == 0)
expect(t, seg2.comparePoint(&point{x: 1, y: 2}) == -1)
expect(t, seg2.comparePoint(&point{x: 0, y: 0}) == 0)
expect(t, seg2.comparePoint(&point{x: 5, y: -1}) == -1)
})
// barely above
t.Run("barely-above", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 1}, nil)
terr(t, err)
pt = &point{x: 2, y: 1 + epsilon*3/2}
expect(t, seg.comparePoint(pt) == 1)
})
// vertical before
t.Run("vertical-before", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 1, y: 3}, nil)
terr(t, err)
pt = &point{x: 0, y: 0}
expect(t, seg.comparePoint(pt) == 1)
})
// vertical after
t.Run("vertical-after", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 1, y: 3}, nil)
terr(t, err)
pt = &point{x: 2, y: 0}
expect(t, seg.comparePoint(pt) == -1)
})
// vertical on
t.Run("vertical-on", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 1, y: 3}, nil)
terr(t, err)
pt = &point{x: 1, y: 0}
expect(t, seg.comparePoint(pt) == 0)
})
// horizontal below
t.Run("horizontal-below", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 1}, nil)
terr(t, err)
pt = &point{x: 0, y: 0}
expect(t, seg.comparePoint(pt) == -1)
})
// horizontal above
t.Run("horizontal-above", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 1}, nil)
terr(t, err)
pt = &point{x: 0, y: 2}
expect(t, seg.comparePoint(pt) == 1)
})
// horizontal on
t.Run("horizontal-on", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 1}, nil)
terr(t, err)
pt = &point{x: 0, y: 1}
expect(t, seg.comparePoint(pt) == 0)
})
// in vertical plane below
t.Run("in-vertical-plane-below", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 3}, nil)
terr(t, err)
pt = &point{x: 2, y: 0}
expect(t, seg.comparePoint(pt) == -1)
})
// in vertical plane above
t.Run("in-vertical-plane-above", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 3}, nil)
terr(t, err)
pt = &point{x: 2, y: 4}
expect(t, seg.comparePoint(pt) == 1)
})
// in horizontal plane upward sloping before
t.Run("in-horizontal-plane-upward-sloping-before", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 3}, nil)
terr(t, err)
pt = &point{x: 0, y: 2}
expect(t, seg.comparePoint(pt) == 1)
})
// in horizontal plane upward sloping after
t.Run("in-horizontal-plane-upward-sloping-after", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 3}, nil)
terr(t, err)
pt = &point{x: 4, y: 2}
expect(t, seg.comparePoint(pt) == -1)
})
// in horizontal plane downward sloping below
t.Run("in-horizontal-plane-downward-sloping-below", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 3}, &point{x: 3, y: 1}, nil)
terr(t, err)
pt = &point{x: 0, y: 2}
expect(t, seg.comparePoint(pt) == -1)
})
// in horizontal plane downward sloping after
t.Run("in-horizontal-plane-downward-sloping-after", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 3}, &point{x: 3, y: 1}, nil)
terr(t, err)
pt = &point{x: 4, y: 2}
expect(t, seg.comparePoint(pt) == 1)
})
// upward more vertical before
t.Run("upward-more-vertical-before", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 6}, nil)
terr(t, err)
pt = &point{x: 0, y: 2}
expect(t, seg.comparePoint(pt) == 1)
})
// upward more vertical after
t.Run("upward-more-vertical-after", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 6}, nil)
terr(t, err)
pt = &point{x: 4, y: 2}
expect(t, seg.comparePoint(pt) == -1)
})
// downward more vertical before
t.Run("downward-more-vertical-before", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 6}, &point{x: 3, y: 1}, nil)
terr(t, err)
pt = &point{x: 0, y: 2}
expect(t, seg.comparePoint(pt) == -1)
})
// downward more vertical after
t.Run("downward-more-vertical-after", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 1, y: 6}, &point{x: 3, y: 1}, nil)
terr(t, err)
pt = &point{x: 4, y: 2}
expect(t, seg.comparePoint(pt) == 1)
})
// downward-sloping segment with almost touching point - from issue 37
t.Run("downward-sloping-segment-with-almost-touching-point", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: 0.523985, y: 51.281651}, &point{x: 0.5241, y: 51.281651000100005}, nil)
terr(t, err)
pt = &point{x: 0.5239850000000027, y: 51.281651000000004}
expect(t, seg.comparePoint(pt) == 1)
})
// avoid splitting loops on near vertical segments - from issue 60-2
t.Run("avoid-splitting-loops-on-near-vertical-segments", func(t *testing.T) {
seg, err = op.newSegmentFromRing(&point{x: -45.3269382, y: -1.4059341}, &point{x: -45.326737413921656, y: -1.40635}, nil)
terr(t, err)
pt = &point{x: -45.326833968900424, y: -1.40615}
expect(t, seg.comparePoint(pt) == 0)
})
}
func TestSegmentgetIntersections2(t *testing.T) {
t.Parallel()
var seg1, seg2, s3 *segment
var err error
var inter *point
op := newOperation("")
// colinear full overlap
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// colinear partial overlap upward slope
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 2, y: 2}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 3}, nil)
terr(t, err)
inter = &point{x: 1, y: 1}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// colinear partial overlap downward slope
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 2}, &point{x: 2, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -1, y: 3}, &point{x: 1, y: 1}, nil)
terr(t, err)
inter = &point{x: 0, y: 2}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// colinear partial overlap horizontal
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 1}, &point{x: 2, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 3, y: 1}, nil)
terr(t, err)
inter = &point{x: 1, y: 1}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// colinear partial overlap vertical
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 0, y: 3}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 2}, &point{x: 0, y: 4}, nil)
terr(t, err)
inter = &point{x: 0, y: 2}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// colinear endpoint overlap
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 2, y: 2}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// colinear no overlap
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 3, y: 3}, &point{x: 4, y: 4}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// parallel no overlap
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 3}, &point{x: 1, y: 4}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// intersect general
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 2, y: 2}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 2}, &point{x: 2, y: 0}, nil)
terr(t, err)
inter = &point{x: 1, y: 1}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// T-intersect with an endpoint
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 2, y: 2}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 5, y: 4}, nil)
terr(t, err)
inter = &point{x: 1, y: 1}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// intersect with vertical
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 5, y: 5}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 3, y: 0}, &point{x: 3, y: 44}, nil)
terr(t, err)
inter = &point{x: 3, y: 3}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// intersect with horizontal
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 5, y: 5}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 3}, &point{x: 23, y: 3}, nil)
terr(t, err)
inter = &point{x: 3, y: 3}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// horizontal and vertical T-intersection
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 5, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 3, y: 0}, &point{x: 3, y: 5}, nil)
terr(t, err)
inter = &point{x: 3, y: 0}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// horizontal and vertical general intersection
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 5, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 3, y: -5}, &point{x: 3, y: 5}, nil)
terr(t, err)
inter = &point{x: 3, y: 0}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// no intersection not even close
seg1, err = op.newSegmentFromRing(&point{x: 1000, y: 10002}, &point{x: 2000, y: 20002}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -234, y: -123}, &point{x: -12, y: -23}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// no intersection kinda close
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 10}, &point{x: 10, y: 0}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// no intersection with vertical touching bbox
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 4}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 2, y: -5}, &point{x: 2, y: 0}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// shared point 1 (endpoint)
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 1}, &point{x: 0, y: 0}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// shared point 2 (endpoint)
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 1}, &point{x: 1, y: 1}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// T-crossing left endpoint
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0.5, y: 0.5}, &point{x: 1, y: 0}, nil)
terr(t, err)
inter = &point{x: 0.5, y: 0.5}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// T-crossing right endpoint
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 1}, &point{x: 0.5, y: 0.5}, nil)
terr(t, err)
inter = &point{x: 0.5, y: 0.5}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// full overlap
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 10, y: 10}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 5, y: 5}, nil)
terr(t, err)
inter = &point{x: 1, y: 1}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// shared point + overlap
seg1, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 10, y: 10}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 5, y: 5}, nil)
terr(t, err)
inter = &point{x: 5, y: 5}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// mutual overlap
seg1, err = op.newSegmentFromRing(&point{x: 3, y: 3}, &point{x: 10, y: 10}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 5, y: 5}, nil)
terr(t, err)
inter = &point{x: 3, y: 3}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// full overlap
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// full overlap, orientation
seg1, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 0, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// colinear, shared point
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 2, y: 2}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// colinear, shared other point
seg1, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 0, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 2, y: 2}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// colinear, one encloses other
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 4}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 2, y: 2}, nil)
terr(t, err)
inter = &point{x: 1, y: 1}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// colinear, one encloses other 2
seg1, err = op.newSegmentFromRing(&point{x: 4, y: 0}, &point{x: 0, y: 4}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 3, y: 1}, &point{x: 1, y: 3}, nil)
terr(t, err)
inter = &point{x: 1, y: 3}
expect(t, seg1.getIntersection(seg2).equal(*inter))
expect(t, seg2.getIntersection(seg1).equal(*inter))
// colinear, no overlap
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 2, y: 2}, &point{x: 4, y: 4}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// parallel
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: -1}, &point{x: 1, y: 0}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// parallel, orientation
seg1, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 0, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: -1}, &point{x: 1, y: 0}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// parallel, position
seg1, err = op.newSegmentFromRing(&point{x: 0, y: -1}, &point{x: 1, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// endpoint intersections should be consistent - issue 60
// If segment A T-intersects segment B, then the non-intersecting endpoint
// of segment A should be irrelevant to the intersection of the two segs
// From https://github.com/mfogel/polygon-clipping/issues/60
x, y := -91.41360941065206, 29.53135
seg1, err = op.newSegmentFromRing(&point{x: x, y: y}, &point{x: -91.4134943, y: 29.5310677}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: x, y: y}, &point{x: -91.413, y: 29.5315}, nil)
terr(t, err)
s3, err = op.newSegmentFromRing(&point{x: -91.4137213, y: 29.5316244}, &point{x: -91.41352785864918, y: 29.53115}, nil)
terr(t, err)
pt := &point{x: x, y: y}
expect(t, seg1.getIntersection(s3).equal(*pt))
expect(t, seg2.getIntersection(s3).equal(*pt))
expect(t, s3.getIntersection(seg1).equal(*pt))
expect(t, s3.getIntersection(seg2).equal(*pt))
// endpoint intersection takes priority - issue 60-5
endX, endY := 55.31, -0.23544126113
seg1, err = op.newSegmentFromRing(&point{x: 18.60315316392773, y: 10.491431056669754}, &point{x: endX, y: endY}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -32.42, y: 55.26}, &point{x: endX, y: endY}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// endpoint intersection between very short and very vertical segment
seg1, err = op.newSegmentFromRing(&point{x: -10.000000000000004, y: 0}, &point{x: -9.999999999999995, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -10.000000000000004, y: 0}, &point{x: -9.999999999999995, y: 1000}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
// avoid intersection - issue 79
seg1, err = op.newSegmentFromRing(&point{x: 145.854148864746, y: -41.99816840491791}, &point{x: 145.85421323776, y: -41.9981723915721}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 145.854148864746, y: -41.998168404918}, &point{x: 145.8543, y: -41.9982}, nil)
terr(t, err)
expect(t, seg1.getIntersection(seg2) == nil)
expect(t, seg2.getIntersection(seg1) == nil)
}
func TestsegmentCompareSegments(t *testing.T) {
t.Parallel()
var seg1, seg2, seg3 *segment
var err error
op := newOperation("")
// non intersecting
// not in same vertical space
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 1, y: 1}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 4, y: 3}, &point{x: 6, y: 7}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == -1)
expect(t, segmentCompare(seg2, seg1) == 1)
// in same vertical space, earlier is below
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: -4}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 1}, &point{x: 6, y: 7}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == -1)
expect(t, segmentCompare(seg2, seg1) == 1)
// in same vertical space, later is below
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: -4}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -5, y: -5}, &point{x: 6, y: -7}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// with left points in same vertical line
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 4}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: -1}, &point{x: 5, y: -5}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// with earlier right point directly under later left point
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 4}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: -1}, &point{x: 5, y: -5}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// with eariler right point directly over earlier left point
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 4}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -5, y: 5}, &point{x: 0, y: 3}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == -1)
expect(t, segmentCompare(seg2, seg1) == 1)
// intersecting not on endpoint
// earlier c omes up from before & below
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -1, y: -5}, &point{x: 1, y: 2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// earlier comes up from directly over & below
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: -2}, &point{x: 3, y: 2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// earlier comes up from after & below
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: -2}, &point{x: 3, y: 2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// later comes down from before & above
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -1, y: 5}, &point{x: 1, y: -2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == -1)
expect(t, segmentCompare(seg2, seg1) == 1)
// later comes up from directly over & above
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: 2}, &point{x: 3, y: -2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == -1)
expect(t, segmentCompare(seg2, seg1) == 1)
// later comes up from after & above
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: 2}, &point{x: 3, y: -2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == -1)
expect(t, segmentCompare(seg2, seg1) == 1)
// with a vertical
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 1, y: -2}, &point{x: 1, y: 2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// intersect but not share on an endpoint
// with a vertical
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 2, y: -2}, &point{x: 6, y: 2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// intersect on left from above
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -2, y: 2}, &point{x: 2, y: -2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// intersect on left from below
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -2, y: -2}, &point{x: 2, y: 2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == -1)
expect(t, segmentCompare(seg2, seg1) == 1)
// intersect on left from vertical
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: 0, y: -2}, &point{x: 0, y: 2}, nil)
terr(t, err)
expect(t, segmentCompare(seg1, seg2) == 1)
expect(t, segmentCompare(seg2, seg1) == -1)
// share right endpoint
// earlier comes up from before & below
seg1, err = op.newSegmentFromRing(&point{x: 0, y: 0}, &point{x: 4, y: 0}, nil)
terr(t, err)
seg2, err = op.newSegmentFromRing(&point{x: -1, y: -5}, &point{x: 4, y: 0}, nil)