3rd-party/poly2tri
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Mason 2009-08-19 19:58:51 -04:00
parent 690f0e138c
commit 122b2d6f40
1 changed files with 8 additions and 5 deletions
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11
src/org/poly2tri/cdt/CDT.scala
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@ -189,14 +189,15 @@ class CDT(polyLine: Array[Point], clearPoint: Point) {
// Locate the first intersected triangle // Locate the first intersected triangle
val firstTriangle = node.triangle.locateFirst(edge) val firstTriangle = node.triangle.locateFirst(edge)
// Remove intersected triangles
if(firstTriangle != null && !firstTriangle.contains(edge)) { if(firstTriangle != null && !firstTriangle.contains(edge)) {
// Constrained edge lies below the advancing front. Traverse through intersected triangles,
// form empty pseudo-polygons, and re-triangulate
// Collect intersected triangles // Collect intersected triangles
val tList = new ArrayBuffer[Triangle] val tList = new ArrayBuffer[Triangle]
tList += firstTriangle tList += firstTriangle
// Not sure why tList.last is null sometimes....
while(!tList.last.contains(edge.p)) while(!tList.last.contains(edge.p))
tList += tList.last.findNeighbor(edge.p) tList += tList.last.findNeighbor(edge.p)
@ -210,6 +211,7 @@ class CDT(polyLine: Array[Point], clearPoint: Point) {
mesh.map -= t mesh.map -= t
}) })
// Using a hashMap or set may improve performance
val lPoints = new ArrayBuffer[Point] val lPoints = new ArrayBuffer[Point]
val rPoints = new ArrayBuffer[Point] val rPoints = new ArrayBuffer[Point]
@ -263,7 +265,7 @@ class CDT(polyLine: Array[Point], clearPoint: Point) {
} else if(firstTriangle == null) { } else if(firstTriangle == null) {
// No triangles are intersected by the edge; edge must lie outside the mesh // No triangles are intersected by the edge; edge must lie outside the mesh
// Apply constraint; traverse the AFront, and build triangles // Apply constraint; traverse the advancing front, and build triangles
val ahead = (edge.p.x > edge.q.x) val ahead = (edge.p.x > edge.q.x)
val point1 = if(ahead) edge.q else edge.p val point1 = if(ahead) edge.q else edge.p
@ -299,11 +301,12 @@ class CDT(polyLine: Array[Point], clearPoint: Point) {
T.last markEdge(point1, point2) T.last markEdge(point1, point2)
} else if(firstTriangle.contains(edge.q, edge.p)) { } else if(firstTriangle.contains(edge.q, edge.p)) {
// Constrained edge lies on the side of a triangle
// Mark constrained edge // Mark constrained edge
firstTriangle markEdge(edge.q, edge.p) firstTriangle markEdge(edge.q, edge.p)
firstTriangle.finalized = true firstTriangle.finalized = true
} else { } else {
throw new Exception("Triangulation error") throw new Exception("Triangulation error - unexpected case")
} }
} }