gRegion::gRegion(const eRect &rect) : extends(rect)
{
- rects.push_back(rect);
+ if (rect.valid() && !rect.empty())
+ rects.push_back(rect);
}
-gRegion::gRegion()
+gRegion::gRegion() : extends(eRect::emptyRect())
{
}
bot = min(r1->y2, r2y1);
if (top != bot) {
curBand = rects.size();
- appendNonO(r1, r1BandEnd, top, bot);
- coalesce(prevBand, curBand);
+ appendNonO(r1, r1BandEnd, top, bot);
+ coalesce(prevBand, curBand);
}
}
ytop = r2y1;
coalesce(prevBand, curBand);
AppendRegions(r2BandEnd, r2End);
}
+
extends = eRect();
- for (int a=0; a<rects.size(); ++a)
- extends = extends | eRect(rects[0].topLeft(), rects[rects.size()-1].bottomRight());
+ for (unsigned int a = 0; a<rects.size(); ++a)
+ extends = extends | rects[a];
+ if (!extends.valid())
+ extends = eRect::emptyRect();
}
void gRegion::intersect(const gRegion &r1, const gRegion &r2)
{
+ /* in case one region is empty, the resulting regions is empty, too. */
if (r1.rects.empty())
{
- *this = r2;
+ *this = r1;
return;
}
if (r2.rects.empty())
{
- *this = r1;
+ *this = r2;
return;
}
int overlap;
void gRegion::moveBy(ePoint offset)
{
extends.moveBy(offset);
- int i;
+ unsigned int i;
for (i=0; i<rects.size(); ++i)
rects[i].moveBy(offset);
}