static public BitmapSource getThumbnail(string filename, int maxHeight)
{
try
{
Bitmap bmp = MediaBitmap.fromFile(filename);
Bitmap tn = MediaBitmap.ResizeHeight(bmp, maxHeight);
BitmapSource image = MediaBitmap.toBitmapSource(tn);
tn.Dispose();
return(image);
}
catch (Exception) { return(null); }
}
static public Bitmap extractRectangle(Bitmap bitmap, Point p1, Point p2, Point p3, Point p4)
{
try
{
List <Point> pts = new List <Point>();
pts.Add(p1);
pts.Add(p2);
pts.Add(p3);
pts.Add(p4);
Point min = new Point(999999, 999999);
Point max = new Point(0, 0);
foreach (Point point in pts)
{
if (point.X < min.X)
{
min.X = (int)point.X;
}
if (point.Y < min.Y)
{
min.Y = (int)point.Y;
}
if (point.X > max.X)
{
max.X = (int)point.X;
}
if (point.Y > max.Y)
{
max.Y = (int)point.Y;
}
}
Bitmap cropped = bitmap.Clone(new Rectangle(min.X, min.Y, max.X - min.X, max.Y - min.Y), bitmap.PixelFormat);
double angle1 = (3600 + MathTools.getAngle(pts[0], pts[1])) % 360;
double angle2 = (3600 + MathTools.getAngle(pts[1], pts[2]) - 90) % 360;
double angle3 = (3600 + MathTools.getAngle(pts[2], pts[3]) - 180) % 360;
double angle4 = (3600 + MathTools.getAngle(pts[3], pts[0]) - 270) % 360;
double angle = (angle1 + angle2 + angle3 + angle4) / 4;
if (Math.Abs(angle2 - angle1) > 5)
{
angle = angle1;
}
else if (Math.Abs(angle3 - angle1) > 5)
{
angle = angle1;
}
else if (Math.Abs(angle4 - angle1) > 5)
{
angle = angle1;
}
int length1 = (int)MathTools.getLength(pts[0], pts[1]);
int length2 = (int)MathTools.getLength(pts[1], pts[2]);
int length3 = (int)MathTools.getLength(pts[2], pts[3]);
int length4 = (int)MathTools.getLength(pts[3], pts[0]);
int lengthW = (length1 + length3) / 2;
int lengthH = (length2 + length4) / 2;
if ((double)Math.Abs(length1 - length3) > 0.05 * (double)Math.Max(length1, length3))
{
lengthW = Math.Max(length1, length3);
}
if ((double)Math.Abs(length2 - length4) > 0.05 * (double)Math.Max(length2, length4))
{
lengthH = Math.Max(length2, length4);
}
Bitmap rotated = MediaBitmap.rotate(cropped, -(float)angle, true);
cropped.Dispose();
Rectangle rect = new Rectangle((rotated.Width - lengthW) / 2, (rotated.Height - lengthH) / 2, lengthW, lengthH);
if (rect.X < 0 || rect.Y < 0 || rect.Width > rotated.Width || rect.Height > rotated.Height || rect.X + rect.Width > rotated.Width || rect.Y + rect.Height > rotated.Height)
{
return(rotated);
}
cropped = rotated.Clone(rect, rotated.PixelFormat);
rotated.Dispose();
return(cropped);
}
catch (Exception)
{
return(null);
}
}
static public BitmapSource fromBitmap(Bitmap bitmap)
{
return(MediaBitmap.toBitmapSource(bitmap));
}
