private void button2_Click(object sender, EventArgs e)
{
SaveFileDialog sv = new SaveFileDialog();
sv.Filter = "File png(*.png)|*.png|File Bitmap(*.bmp)|*.bmp|File jpg (*.jpg)|*.jpg";
if (sv.ShowDialog() == DialogResult.OK)
{
Bitmap bmp = new Bitmap(file);
int width = bmp.Width;
int height = bmp.Height;
Dictionary<Point, int> currentLayer = new Dictionary<Point, int>();
currentLayer[new Point(0, 0)] = 0;
currentLayer[new Point(width - 1, height - 1)] = 0;
while (currentLayer.Count != 0)
{
//mappatura dell'immagine
foreach (Point p in currentLayer.Keys)
bmp.SetPixel(p.X, p.Y, Color.Black);
Dictionary<Point, int> newLayer = new Dictionary<Point, int>();
foreach (Point p in currentLayer.Keys)
foreach (Point p1 in Neighbors(p, width, height))
if (Distance(bmp.GetPixel(p1.X, p1.Y), Color.White) < 40)
newLayer[p1] = 0;
currentLayer = newLayer;
}
bmp.Save(sv.FileName);
}
}
static int Distance(Color c1, Color c2)
{
int dr = Math.Abs(c1.R - c2.R);
int dg = Math.Abs(c1.G - c2.G);
int db = Math.Abs(c1.B - c2.B);
return Math.Max(Math.Max(dr, dg), db);
}
static List<Point> Neighbors(Point p, int maxX, int maxY)
{
List<Point> points = new List<Point>();
if (p.X + 1 < maxX) points.Add(new Point(p.X + 1, p.Y));
if (p.X - 1 >= 0) points.Add(new Point(p.X - 1, p.Y));
if (p.Y + 1 < maxY) points.Add(new Point(p.X, p.Y + 1));
if (p.Y - 1 >= 0) points.Add(new Point(p.X, p.Y - 1));
return points;
}
