public static Image GetSelection(this Image image, Rectangle selection, bool convertToGrayscale)
{
LocklessBitmap bitmap = new LocklessBitmap(selection.Width, selection.Height);
using (Graphics graphics = Graphics.FromImage(bitmap.Bitmap))
{
//graphics.DrawImage(new Bitmap(image), new Rectangle(0, 0, selection.Width, selection.Height), selection, GraphicsUnit.Pixel);
graphics.DrawImage(image, new Rectangle(0, 0, selection.Width, selection.Height), selection, GraphicsUnit.Pixel);
}
if (convertToGrayscale)
{
bitmap.SetToGrayscale();
}
return(bitmap.Bitmap);
}
public static string Measure(LocklessBitmap bitmap, float[] perf, byte threshold)
{
int width = bitmap.Width;
int height = bitmap.Height;
int xMin = width / 8;
int xMax = width - xMin;
int yMin = height / 8;
int yMax = height - yMin;
Rectangle[] areas = new Rectangle[]
{
new Rectangle(xMin, 0, xMax - xMin, yMin),
new Rectangle(xMax, yMin, xMin, yMax - yMin),
new Rectangle(xMin, yMax, xMax - xMin, yMin),
new Rectangle(0, yMin, xMin, yMax - yMin)
};
int[] rotation = new int[] { 0, -90, 180, +90 };
int[] antiRotation = new int[] { 0, +90, 180, -90 };
LocklessBitmap[] bitmaps = new LocklessBitmap[]
{
bitmap.Copy(areas[(int)Side.Top]).Rotate(rotation[(int)Side.Top]),
bitmap.Copy(areas[(int)Side.Right]).Rotate(rotation[(int)Side.Right]),
bitmap.Copy(areas[(int)Side.Bottom]).Rotate(rotation[(int)Side.Bottom]),
bitmap.Copy(areas[(int)Side.Left]).Rotate(rotation[(int)Side.Left])
};
int[] edges = new int[] { 0, 0, 0, 0 };
float[][] perforations = new float[4][];
Dictionary <int, float>[] teeth = new Dictionary <int, float> [4];
Dictionary <int, float>[] holes = new Dictionary <int, float> [4];
for (int i = (int)Side.Top; i <= (int)Side.Left; i++)
{
LocklessBitmap b = bitmaps[i];
teeth[i] = new Dictionary <int, float>();
holes[i] = new Dictionary <int, float>();
perforations[i] = new float[0];
for (int y = 0; y < b.Height; y++)
{
for (int x = 0; x < b.Width; x++)
{
b.SetPixel(x, y, b.GetGrayscale(x, y) <= threshold ? Color.Black : Color.White);
}
}
bool removed = true;
while (removed)
{
removed = false;
for (int y = 1; y < b.Height - 1; y++)
{
for (int x = 1; x < b.Width - 1; x++)
{
Color otherColor = b.IsColor(x, y, Color.Black) ? Color.White : Color.Black;
int otherCount = 0;
for (int dx = -1; dx <= +1; dx++)
{
for (int dy = -1; dy <= +1; dy++)
{
if (!(dx == 0 && dy == 0))
{
if (b.IsColor(x + dx, y + dy, otherColor))
{
otherCount++;
}
}
}
}
if (otherCount >= 6)
{
b.SetPixel(x, y, otherColor);
removed = true;
}
}
}
}
int y1, y2;
y1 = 0;
while (y1 < b.Height && b.IsColor(0, y1, b.Width - 1, y1, Color.Black, 0.90F))
{
y1++;
}
if (!(y1 > 0 && y1 < b.Height))
{
continue; // Not found the upper bound, so continue with the next side
}
y2 = y1;
while (y2 < b.Height && !b.IsColor(0, y2, b.Width - 1, y2, Color.White, 1))
{
y2++;
}
if (!(y2 > y1 && y2 < b.Height))
{
continue; // Not found the lower bound, so continue with the next side
}
for (int x = 1; x < b.Width - 1; x++) // Iterate from +1 to Width-2 because of the pixel removal !!!
{
for (int y = y2; y > y1; y--)
{
if (!b.IsColor(x, y, Color.White))
{
for (int yy = y; yy > y1; yy--)
{
b.SetPixel(x, yy, Color.Black);
}
break;
}
}
}
perforations[i] = new float[b.Width - 2];
float[] perfs = perforations[i];
for (int x = 1; x < b.Width - 1; x++) // Iterate from +1 to Width-2 because of the pixel removal which not done at the side !!!
{
for (int y = y1; y <= y2; y++)
{
if (b.IsColor(x, y, Color.White))
{
perfs[x - 1] = y;
break;
}
else
{
b.SetPixel(x, y, Color.LightGray);
}
}
}
for (int m = 1; m <= 25; m++)
{
if (m % 2 == 0)
{
for (int p = 1; p < perfs.Length - 1; p++)
{
perfs[p] = (perfs[p - 1] + perfs[p] + perfs[p + 1]) / 3;
}
}
else
{
for (int p = perfs.Length - 2; p >= 1; p--)
{
perfs[p] = (perfs[p - 1] + perfs[p] + perfs[p + 1]) / 3;
}
}
}
teeth[i] = new Dictionary <int, float>();
holes[i] = new Dictionary <int, float>();
for (int p = 1; p < perfs.Length - 1; p++)
{
if (perfs[p] < perfs[p - 1] && perfs[p] < perfs[p + 1])
{
teeth[i].Add(p, perfs[p]);
}
if (perfs[p] > perfs[p - 1] && perfs[p] > perfs[p + 1])
{
holes[i].Add(p, perfs[p]);
}
}
for (int x = 1; x < b.Width - 1; x++)
{
int y = (int)perfs[x - 1];
b.SetPixels(x, y - 1, x, y + 1, Color.Blue);
}
edges[i] = y1;
}
int widthInPixels = 0;
int heightInPixels = 0;
int top = edges[(int)Side.Top];
int right = edges[(int)Side.Right] != 0 ? bitmap.Width - edges[(int)Side.Right] - 1 : 0;
int bottom = edges[(int)Side.Bottom] != 0 ? bitmap.Height - edges[(int)Side.Bottom] - 1 : 0;
int left = edges[(int)Side.Left];
if (left != 0 && right != 0)
{
widthInPixels = right - left;
}
if (top != 0 && bottom != 0)
{
heightInPixels = bottom - top;
}
for (int i = (int)Side.Top; i <= (int)Side.Left; i++)
{
bitmaps[i] = bitmap.Copy(areas[i]).Rotate(rotation[i]);
LocklessBitmap b = bitmaps[i];
b.SetToGrayscale();
int thickness = 0;
if (edges[i] != 0)
{
b.SetPixels(0, edges[i] - thickness, b.Width - 1, edges[i] + thickness, Color.Red);
}
if (teeth[i].Count() != 0)
{
foreach (KeyValuePair <int, float> t in teeth[i])
{
int y = (int)Math.Round((double)t.Value);
b.SetPixels(t.Key - thickness, 0, t.Key + thickness, y, Color.Yellow);
}
}
if (holes[i].Count() != 0)
{
foreach (KeyValuePair <int, float> h in holes[i])
{
int y = (int)Math.Round((double)h.Value);
b.SetPixels(h.Key - thickness, y, h.Key + thickness, b.Height - 1, Color.Blue);
}
}
if (perforations[i].Length != 0)
{
for (int x = 1; x < b.Width - 1; x++)
{
int y = (int)Math.Round((double)perforations[i][x - 1]);
b.SetPixels(x, y - thickness, x, y + thickness, Color.Magenta);
}
}
bitmap.Copy(bitmaps[i].Rotate(antiRotation[i]), areas[i]);
}
float[] sizes = new float[4] {
0, 0, 0, 0
};
for (int i = (int)Side.Top; i <= (int)Side.Left; i++)
{
if (teeth[i].Count >= 5 && holes[i].Count >= 5)
{
int teethFirst = teeth[i].First().Key;
int teethLast = teeth[i].Last().Key;
int teethPixels = teethLast - teethFirst;
float teethSize = 20F / perf[i] * (teeth[i].Count() - 1);
int holesFirst = holes[i].First().Key;
int holesLast = holes[i].Last().Key;
int holesPixels = holesLast - holesFirst;
float holesSize = 20F / perf[i] * (holes[i].Count() - 1);
float areaSizeInMillimetersBasedOnTeeth = (float)areas[i].Width / teethPixels * teethSize;
float areaSizeInMillimetersBasedOnHoles = (float)areas[i].Width / holesPixels * holesSize;
int sizeInPixels = (i == 0 || i == 2 ? widthInPixels : heightInPixels);
float stampSizeTeeth = (float)sizeInPixels / areas[i].Width * areaSizeInMillimetersBasedOnTeeth;
float stampSizeHoles = (float)sizeInPixels / areas[i].Width * areaSizeInMillimetersBasedOnHoles;
sizes[i] = (stampSizeTeeth + stampSizeHoles) / 2;
}
}
float horizontal =
sizes[(int)Side.Top] != 0 && sizes[(int)Side.Bottom] != 0 ?
(sizes[(int)Side.Top] + sizes[(int)Side.Bottom]) / 2 :
(sizes[(int)Side.Top] != 0 ?
sizes[(int)Side.Top] :
sizes[(int)Side.Bottom]);
float vertical =
sizes[(int)Side.Right] != 0 && sizes[(int)Side.Left] != 0 ?
(sizes[(int)Side.Right] + sizes[(int)Side.Left]) / 2 :
(sizes[(int)Side.Right] != 0 ?
sizes[(int)Side.Right] :
sizes[(int)Side.Left]);
string size = string.Format(
"{0} × {1} {2} {3} · {4} × {5} · {6}",
Math.Round(horizontal, 1), Math.Round(vertical, 1), char.ConvertFromUtf32(0x2190),
Math.Round(sizes[(int)Side.Top], 1), Math.Round(sizes[(int)Side.Bottom], 1),
Math.Round(sizes[(int)Side.Right], 1), Math.Round(sizes[(int)Side.Left], 1)
);
return(size);
}
