public static void DrawMarker(this KalikoImage ki, Point p, Color col, int radius = 1)
{
List <Point> points = new List <Point>();
for (int j = -radius; j < radius; ++j)
{
for (int i = -radius; i < radius; ++i)
{
int x = p.X + i;
int y = p.Y + j;
if (ki.IsPointCorrect(x, y))
{
points.Add(new Point(x, y));
}
}
}
SetPixels(ki, points, col);
}