private int EventCompare(bool p1IsStart, Point p11, Point p12, bool p2IsStart, Point p21, Point p22)
{
// compare the selected points first
int comp = PointUtils.PointsCompare(p11, p21);
if (comp != 0)
{
return(comp);
}
// the selected points are the same
if (PointUtils.PointsSame(p12, p22)) // if the non-selected points are the same too...
{
return(0); // then the segments are equal
}
if (p1IsStart != p2IsStart) // if one is a start and the other isn"t...
{
return(p1IsStart ? 1 : -1); // favor the one that isn"t the start
}
// otherwise, we"ll have to calculate which one is below the other manually
return(PointUtils.PointAboveOrOnLine(p12,
p2IsStart ? p21 : p22, // order matters
p2IsStart ? p22 : p21
)
? 1
: -1);
}
public void AddRegion(Region region)
{
// regions are a list of points:
// [ [0, 0], [100, 0], [50, 100] ]
// you can add multiple regions before running calculate
Point pt1;
Point pt2 = region.Points[region.Points.Count - 1];
for (int i = 0; i < region.Points.Count; i++)
{
pt1 = pt2;
pt2 = region.Points[i];
int forward = PointUtils.PointsCompare(pt1, pt2);
if (forward == 0) // points are equal, so we have a zero-length segment
{
continue; // just skip it
}
EventAddSegment(
SegmentNew(
forward < 0 ? pt1 : pt2,
forward < 0 ? pt2 : pt1
),
true
);
}
}