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turned off triangle randomization because of weird bug - will fix later

This commit is contained in:
zzzzrrr 2009-07-16 15:52:47 -04:00
parent 9cdc372690
commit 59af31682d
1 changed files with 12 additions and 8 deletions
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20
src/org/poly2tri/Triangulator.scala
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@ -34,18 +34,18 @@ import scala.collection.mutable.ArrayBuffer
// Based on Raimund Seidel's paper "A simple and fast incremental randomized // Based on Raimund Seidel's paper "A simple and fast incremental randomized
// algorithm for computing trapezoidal decompositions and for triangulating polygons" // algorithm for computing trapezoidal decompositions and for triangulating polygons"
class Triangulator(var segments: ArrayBuffer[Segment]) { class Triangulator(segments: ArrayBuffer[Segment]) {
// Triangle decomposition list // Triangle decomposition list
var triangles = new ArrayBuffer[Array[Point]] var triangles = new ArrayBuffer[Array[Point]]
// Order and randomize the segments // Order and randomize the segments
segments = orderSegments val segs = orderSegments
// Build the trapezoidal map and query graph // Build the trapezoidal map and query graph
def process { def process {
for(s <- segments) { for(s <- segs) {
val traps = queryGraph.followSegment(s) val traps = queryGraph.followSegment(s)
// Remove trapezoids from trapezoidal Map // Remove trapezoids from trapezoidal Map
traps.foreach(trapezoidalMap.remove) traps.foreach(trapezoidalMap.remove)
@ -139,14 +139,18 @@ class Triangulator(var segments: ArrayBuffer[Segment]) {
private def orderSegments = { private def orderSegments = {
// Ignore vertical segments! // Ignore vertical segments!
val segs = new ArrayBuffer[Segment] val segs = new ArrayBuffer[Segment]
for(s <- segments) { for(s <- segments)
// Point p must be to the left of point q // Point p must be to the left of point q
if(s.p.x > s.q.x) { if(s.p.x > s.q.x) {
segs += new Segment(s.q.clone, s.p.clone) val tmp = s.p
s.p = s.q
s.q = tmp
segs += s
} else if(s.p.x < s.q.x) } else if(s.p.x < s.q.x)
segs += new Segment(s.p.clone, s.q.clone) segs += s
} // Randomized triangulation improves performance
// This is actually important: See Seidel's paper // See Seidel's paper, or O'Rourke's book, p. 57
// Turn this off for now because of stupid pointer bug somewhere!
//Random.shuffle(segs) //Random.shuffle(segs)
segs segs
} }