/**
* Create all initial line segments. We can be certain there are no zero-length
* lines as these are screened earlier.
*/
void createInitialLineSegments(LineSegmentBlockTreeNode &rootNode)
{
for(Line *line : lines)
{
Sector *frontSec = line->frontSectorPtr();
Sector *backSec = line->backSectorPtr();
// Handle the "one-way window" effect.
if(!backSec && line->_bspWindowSector)
{
backSec = line->_bspWindowSector;
}
LineSegment *seg = makeLineSegment(line->from(), line->to(),
frontSec, backSec, &line->front());
if(seg->front().hasSector())
{
linkLineSegmentInBlockTree(rootNode, seg->front());
}
if(seg->back().hasSector())
{
linkLineSegmentInBlockTree(rootNode, seg->back());
}
edgeTipSet(line->from()) << EdgeTip(seg->front());
edgeTipSet(line->to()) << EdgeTip(seg->back());
}
}
/**
* @return The new line segment (front is from @a start to @a end).
*/
LineSegment *makeLineSegment(Vertex &start, Vertex &end, Sector *frontSec,
Sector *backSec, LineSide *frontSide, Line *partitionLine = nullptr)
{
LineSegment *newSeg = new LineSegment(start, end);
lineSegments << newSeg;
LineSegmentSide &front = newSeg->front();
front.setMapSide(frontSide);
front.setPartitionMapLine(partitionLine);
front.setSector(frontSec);
LineSegmentSide &back = newSeg->back();
back.setMapSide(frontSide? &frontSide->back() : nullptr);
back.setPartitionMapLine(partitionLine);
back.setSector(backSec);
return newSeg;
}