private Corner MakeCorner(Vector point)
{
if (point == null) {
return null;
}
int bucket;
for (bucket = (int) point.X - 1; bucket <= (int) point.X + 1; bucket++) {
foreach (Corner possibleCorner in (ArrayList) _cornerMap[bucket]) {
var dx = point.X - possibleCorner.location.X;
var dy = point.Y - possibleCorner.location.Y;
if (dx * dx + dy * dy < 1E-6) {
return possibleCorner;
}
}
}
bucket = (int) point.X;
if (_cornerMap[bucket] == null) {
_cornerMap[bucket] = new ArrayList();
}
var corner = new Corner {
index = _corners.Count,
location = point,
mapBorder =
(Math.Abs(point.X) < 1E-6 || Math.Abs(point.X - _size) < 1E-6 || Math.Abs(point.Y) < 1E-6 ||
Math.Abs(point.Y - _size) < 1E-6),
touches = new HashSet<Center>(),
protrudes = new HashSet<Edge>(),
adjacent = new HashSet<Corner>()
};
_corners.Add(corner);
_cornerMap[bucket] = corner;
return corner;
}
private void AddToCornerList(Corner corner, HashSet<Corner> corners)
{
if (corner != null && !corners.Contains(corner)) {
corners.Add(corner);
}
}