GDI+ problem

pravo_u_raj · February 12th, 2006, 06:35 PM

Hi people,
I have few big problems that I can't resolve. I was codding for my graduation and with last two functions I have big problems. I wrote program for picture processing, and I stoped on functions for croping image and for skew. If somebody can help me, i'll be very thankfule. I have picture on what I've been processing in bitmap object, and I cant crop nor skew it
Help people please, it's very urgent! I must graduate in few days!
Tnx a lot!!!

adam_kahtava · February 12th, 2006, 06:49 PM

Submitting some source code would be a good idea..

Good luck on the graduation.

- A.Kahtava

pravo_u_raj · February 12th, 2006, 08:04 PM

On example, function for Resize...

Code:

public static Bitmap Resize(Bitmap b, int nWidth, int nHeight)
{
    Bitmap bTemp = (Bitmap)b.Clone();
    b = new Bitmap(nWidth, nHeight, bTemp.PixelFormat);

    double nXFactor = (double)bTemp.Width/(double)nWidth;
    double nYFactor = (double)bTemp.Height/(double)nHeight;

    for (int x = 0; x < b.Width; ++x)
        for (int y = 0; y < b.Height; ++y)
            b.SetPixel(x, y, bTemp.GetPixel((int)(Math.Floor(x * nXFactor)),(int)(Math.Floor(y * nYFactor))));
    return b;
}

My idea was to submit to function my bitmap and points(for crop) or angle/points (for skew) and at the end to return bitmap for later save or use another funcion...

Ljuba

adam_kahtava · February 12th, 2006, 10:08 PM

a couple questions:
Why are you using a static function?
How are you calling this function from your code?
Are you intending to change the value of Bitmap 'b' and later accessing it from your main?

Consider the following function:

public Bitmap Resize( Bitmap b, int nWidth, int nHeight )
{
  Bitmap result = new Bitmap( nWidth, nHeight );
  using( Graphics g = Graphics.FromImage( (Image) result ) )
    g.DrawImage( b, 0, 0, nWidth, nHeight );
  return result;
}

http://www.peterprovost.org/archive/2003/05/29/516.aspx

- A.Kahtava

pravo_u_raj · February 16th, 2006, 05:27 PM

hey,
tnx you, very very mutch
i'm sorry i little late with post, but i have a lot of work...

have anybody idea for function for skew... execly i need only formula for any angle...
i'll use next code:

Code:

PointF[] skewedCoordinates =
{
new PointF(boundsRectangle.Left,  boundsRectangle.Top),
new PointF(boundsRectangle.Right, boundsRectangle.Top),
new PointF(boundsRectangle.Left + boundsRectangle.Height, boundsRectangle.Bottom)
};

tnx