private void rotation_Click(object sender, EventArgs e)
{
if (curBitmap != null)
{
rotation rotForm = new rotation();
if (rotForm.ShowDialog() == DialogResult.OK)
{
int degree = Convert.ToInt32(rotForm.GetDegree);
rotateImage(degree);
}
Invalidate();
}
}
private void rotation_Click(object sender, EventArgs e)
{
if (curBitmap != null)
{
rotation rotForm = new rotation();
if (rotForm.ShowDialog() == DialogResult.OK)
{
Rectangle rect = new Rectangle(0, 0, curBitmap.Width, curBitmap.Height);
System.Drawing.Imaging.BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, curBitmap.PixelFormat);
IntPtr ptr = bmpData.Scan0;
int bytes = curBitmap.Width * curBitmap.Height;
byte[] grayValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);
int degree = Convert.ToInt32(rotForm.GetDegree);
double radian = degree * Math.PI / 180.0;
double mySin = Math.Sin(radian);
double myCos = Math.Cos(radian);
int halfWidth = (int)(curBitmap.Width / 2);
int halfHeight = (int)(curBitmap.Height / 2);
int xr = 0;
int yr = 0;
int tempWidth = 0;
int tempHeight = 0;
byte[] tempArray = new byte[bytes];
double tempX, tempY, p, q;
for (int i = 0; i < curBitmap.Height; i++)
{
for (int j = 0; j < curBitmap.Width; j++)
{
tempHeight = i - halfHeight;
tempWidth = j - halfWidth;
tempX = tempWidth * myCos - tempHeight * mySin;
tempY = tempHeight * myCos + tempWidth * mySin;
if (tempWidth > 0)
{
xr = (int)tempX;
}
else
{
xr = (int)(tempX - 1);
}
if (tempHeight > 0)
{
yr = (int)tempY;
}
else
{
yr = (int)(tempY - 1);
}
p = tempX - xr;
q = tempY - yr;
tempWidth = xr + halfWidth;
tempHeight = yr + halfHeight;
if (tempWidth < 0 || (tempWidth + 1) >= curBitmap.Width || tempHeight < 0 || (tempHeight + 1) >= curBitmap.Height)
{
tempArray[i * curBitmap.Width + j] = 255;
}
else
{
tempArray[i * curBitmap.Width + j] = (byte)((1.0 - q) * ((1.0 - p) * grayValues[tempHeight * curBitmap.Width + tempWidth] + p * grayValues[tempHeight * curBitmap.Width + tempWidth + 1]) +
q * ((1.0 - p) * grayValues[(tempHeight + 1) * curBitmap.Width + tempWidth] + p * grayValues[(tempHeight + 1) * curBitmap.Width + 1 + tempWidth]));
}
}
}
grayValues = (byte[])tempArray.Clone();
System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes);
curBitmap.UnlockBits(bmpData);
}
Invalidate();
}
}
