private Rectangle GetVertexCellArea(Point vertexPos, int lineRadius, int cellSize, CheckCellOccupationDelegate cellProcessed)
{
// Calculate the cells occupied by the vertex point considering its line radius
// (for performance reasons, we assume the point to be a rectangle)
Point cellLT = ShapeUtils.CalcCell(vertexPos.X - lineRadius, vertexPos.Y - lineRadius, cellSize);
Point cellRB = ShapeUtils.CalcCell(vertexPos.X + lineRadius, vertexPos.Y + lineRadius, cellSize);
Rectangle cells = Rectangle.Empty;
cells.Location = cellLT;
cells.Width = cellRB.X - cellLT.X;
cells.Height = cellRB.Y - cellLT.Y;
return cells;
}
private IEnumerable<Point> GetAreaCells(int cellsLeft, int cellsTop, int cellsRight, int cellsBottom, CheckCellOccupationDelegate cellProcessed)
{
// Calculate the cells occupied by the vertex point considering its line radius
// (for performance reasons, we assume the point to be a rectangle)
Point p = Point.Empty;
for (p.X = cellsLeft; p.X <= cellsRight; p.X += 1) {
for (p.Y = cellsTop; p.Y <= cellsBottom; p.Y += 1) {
if (cellProcessed == null) yield return p;
else if (!cellProcessed(p)) yield return p;
}
}
}
