public static List <Vec> PositionsNearBorder <T>(this VecArray <T> array, int distance)
{
List <Vec> result = new List <Vec>();
if (distance <= 0)
{
return(result);
}
int width = array.Get().GetLength(0);
int height = array.Get().GetLength(1);
if (distance * 2 >= width && distance * 2 >= height)
{
return(array.AllPositions());
}
for (int x = 0; x < width; ++x)
{
for (int y = 0; y < height; ++y)
{
if (y == distance && x >= distance && x < width - distance)
{
y = height - distance;
}
result.Add(new Vec(x, y));
}
}
return(result);
}
