private FGEArea computeHalfPlaneIntersection(FGEHalfPlane hp) {
if (hp.containsArea(this)) {
return this.clone();
}
if (computeLineIntersection(hp.line) instanceof FGEEmptyArea) {
return new FGEEmptyArea();
} else {
if (logger.isLoggable(Level.FINE)) {
logger.fine("computeHalfPlaneIntersection() for rectangle when halfplane cross rectangle");
}
FGEArea a = computeLineIntersection(hp.line);
Vector<FGEPoint> pts = new Vector<FGEPoint>();
if (a instanceof FGEUnionArea
&& ((FGEUnionArea) a).isUnionOfPoints()
&& ((FGEUnionArea) a).getObjects().size() == 2) {
pts.add((FGEPoint) ((FGEUnionArea) a).getObjects().firstElement());
pts.add((FGEPoint) ((FGEUnionArea) a).getObjects().elementAt(1));
} else if (a instanceof FGESegment) {
pts.add(((FGESegment) a).getP1());
pts.add(((FGESegment) a).getP2());
}
FGEPoint ne, nw, se, sw;
ne = new FGEPoint(x + width, y);
nw = new FGEPoint(x, y);
se = new FGEPoint(x + width, y + height);
sw = new FGEPoint(x, y + height);
if (hp.containsPoint(ne) && !pts.contains(ne)) {
pts.add(ne);
}
if (hp.containsPoint(nw) && !pts.contains(nw)) {
pts.add(nw);
}
if (hp.containsPoint(se) && !pts.contains(se)) {
pts.add(se);
}
if (hp.containsPoint(sw) && !pts.contains(sw)) {
pts.add(sw);
}
if (getIsFilled()) {
return FGEPolygon.makeArea(Filling.FILLED, pts);
} else {
return new FGEUnionArea(pts);
}
}
}
