public bool Adjacent(Letter l)
{
foreach (Point p in l.Pixels)
{
if (Adjacent(p))
{
return true;
}
}
return false;
}
public bool MergePixels(Letter l, Bitmap image)
{
// find out resulting width, if too great abort merge
int min = MinX < l.MinX ? MinX : l.MinX;
int max = MaxX > l.MaxX ? MaxX : l.MaxX;
if (max - min + 1 > MAX_LETTER_WIDTH)
{
return false;
}
MinX = min;
MaxX = max;
MinY = MinY < l.MinY ? MinY : l.MinY;
MaxY = MaxY > l.MaxY ? MaxY : l.MaxY;
// add all of the pixels of the merged letter
pixels.AddRange(l.Pixels);
// change their color
/*foreach (Point p in l.Pixels)
{
image.SetPixel(p.X, p.Y, Color);
}*/
return true;
}
private Bitmap Captcha()
{
Bitmap image = new Bitmap(Image.FromFile(file));
List<Letter> toRemove = new List<Letter>();
for (int y = 0; y < image.Height; y++)
{
for (int x = 0; x < image.Width; x++)
{
Color c = image.GetPixel(x, y);
if (c.R < 70 && c.G < 70 && c.B < 70)
{
image.SetPixel(x, y, Color.FromArgb(255, 255, 0, 0));
}
else if (c.R < 163 && c.G < 163 && c.B < 163)
{
//image.SetPixel(x, y, Color.FromArgb(255, 0, 255, 0));
// check if point is adjacent to any of the points in the existing letters
Point p = new Point(x, y);
int letter = -1;
List<int> close = new List<int>();
for (int i = -1; i <= 1; i++)
{
for (int j = -1; j <= 1; j++)
{
if (i == 0 && j == 0) continue;
string key = (x + i) + "," + (y + j);
if (dic.ContainsKey(key))
{
if (letter != -1 && letter != dic[key])
{
close.Add(dic[key]);
continue;
}
letter = dic[key];
}
}
}
if (letter == -1)
{
// add new letter
Letter l = new Letter();
l.MinX = p.X;
l.MaxX = p.X;
l.MinY = p.Y;
l.MaxY = p.Y;
l.Pixels.Add(p);
dic[p.X + "," + p.Y] = letters.Count;
//l.Color = cols[letters.Count % cols.Length];
//image.SetPixel(x, y, l.Color);
letters.Add(l);
continue;
}
if (p.X < letters[letter].MinX)
letters[letter].MinX = p.X;
if (p.Y < letters[letter].MinY)
letters[letter].MinY = p.Y;
if (p.X > letters[letter].MaxX)
letters[letter].MaxX = p.X;
if (p.Y > letters[letter].MaxY)
letters[letter].MaxY = p.Y;
letters[letter].Pixels.Add(p);
dic[p.X + "," + p.Y] = letter;
// merge all other nearby letters with this one
foreach (int l in close)
{
if (letters[letter].MergePixels(letters[l], image))
{
toRemove.Add(letters[l]);
foreach (Point pp in letters[l].Pixels)
{
dic[pp.X + "," + pp.Y] = letter;
}
}
}
}
}
}
foreach (Letter l in toRemove)
{
letters.Remove(l);
}
// complexity: O(n)
// min: 151ms, max: 245ms, avg: 177.147058823529ms
Random r = new Random((int)(DateTime.Now.Ticks / 1000));
// highlight each individual letter by assigning a separate color
for (int i = 0; i < letters.Count; i++)
{
letters[i].Color = Color.FromArgb(255, (r.Next(0, 255) + i * 2) % 255,
(r.Next(0, 255) + i * 3) % 255,
(r.Next(0, 255) + i * 5) % 255); //cols[i%cols.Length];
foreach (Point p in letters[i].Pixels)
{
image.SetPixel(p.X, p.Y, letters[i].Color);
}
}
// draw the whole text image
Invoke(new MethodInvoker(delegate
{
Graphics g = Graphics.FromHwnd(Handle); // real graphics
g.DrawImage(image, 540, 80);
g.Dispose();
}));
/*
for (int i = 0; i < letters.Count; i++)
{
// create new image containing just this letter, white on black
Image single = letters[i].CreateImage();
// prompt user to read letter, if 'bad' is inputted, letter was not properly recognized
Invoke(new MethodInvoker(delegate
{
Graphics g = Graphics.FromHwnd(Handle); // real graphics
g.DrawImage(new Bitmap(100, 40, PixelFormat.Format24bppRgb), 540, 30);
g.DrawImage(single, 540, 30);
g.Dispose();
textBox2.Text = "";
textBox2.Enabled = true;
textBox2.Focus();
}));
while (textBox2.Enabled)
{
Thread.Sleep(100);
}
// save individual letter to jpg file
if (textBox2.Text.ToLower() != "bad")
{
if (!Directory.Exists(LETTER_PATH + textBox2.Text))
{
Directory.CreateDirectory(LETTER_PATH + textBox2.Text);
}
for (int j = 0; ; j++)
{
if (File.Exists(LETTER_PATH + textBox2.Text + "\\" + j +
".jpg")) continue;
single.Save(LETTER_PATH + textBox2.Text + "\\" + j +
".jpg");
break;
}
}
}
*/
return image;
}
