protected Bitmap Rotate(Bitmap bitmap, float angle)
{
PointF[] rotationPoints = { new PointF(0, 0),
new PointF(bitmap.Width, 0),
new PointF(0, bitmap.Height),
new PointF(bitmap.Width, bitmap.Height) };
PointMath.RotatePoints(rotationPoints, new PointF(bitmap.Width / 2.0f, bitmap.Height / 2.0f), angle);
Rectangle bounds = PointMath.GetBounds(rotationPoints);
Bitmap bmap = new Bitmap(bounds.Width, bounds.Height);
using (Graphics g = Graphics.FromImage(bmap))
{
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
Matrix m = new Matrix();
m.RotateAt((float)angle, new PointF(bitmap.Width / 2.0f, bitmap.Height / 2.0f));
m.Translate(-bounds.Left, -bounds.Top, MatrixOrder.Append);
g.Transform = m;
g.DrawImage(bitmap, 0, 0);
}
return((Bitmap)bmap.Clone());
}
public void Rotate(float angle)
{
imageHandler.RestorePrevious();
PointF[] rotationPoints = { new PointF(0, 0),
new PointF(imageHandler.CurrentBitmap.Width, 0),
new PointF(0, imageHandler.CurrentBitmap.Height),
new PointF(imageHandler.CurrentBitmap.Width, imageHandler.CurrentBitmap.Height) };
PointMath.RotatePoints(rotationPoints, new PointF(imageHandler.CurrentBitmap.Width / 2.0f, imageHandler.CurrentBitmap.Height / 2.0f), angle);
Rectangle bounds = PointMath.GetBounds(rotationPoints);
Bitmap bmap = new Bitmap(bounds.Width, bounds.Height);
using (Graphics g = Graphics.FromImage(bmap))
{
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
Matrix m = new Matrix();
m.RotateAt((float)angle, new PointF(imageHandler.CurrentBitmap.Width / 2.0f, imageHandler.CurrentBitmap.Height / 2.0f));
m.Translate(-bounds.Left, -bounds.Top, MatrixOrder.Append);
g.Transform = m;
g.DrawImage(imageHandler.CurrentBitmap, 0, 0);
}
imageHandler.CurrentBitmap = (Bitmap)bmap.Clone();
}