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Image Rotation in GDI+

 
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Image Rotation in GDI+, Image Rotation using Win32/GDI+
Lamefif
5 Jun, 2007 - 07:00 AM
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gr.RotateTransform(45);
gr.DrawImage(&img,0,0);

that will rotate an image round the window corner, how can i rotate it through the image center instead, or make it look as if it is.

ty
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NickDMax
RE: Image Rotation In GDI+
6 Jun, 2007 - 07:08 PM
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I was really hoping that some GDI+ guru would step up and talk about coordinate transforms. I believe that you will have to translate the coordinate system, OR not place it at (0,0)... So if you place the image at (-ImageWidth/2, -ImageHeight/2) that should be right, or you can translate the coordinate system by half the Image height and width.

Hopefully someone who knows a bit more about GDI+ can tell us if I am right. (else you have to wait until I have time to play with it and see).
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Lamefif
RE: Image Rotation In GDI+
7 Jun, 2007 - 05:41 AM
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QUOTE(NickDMax @ 6 Jun, 2007 - 08:08 PM) *

I was really hoping that some GDI+ guru would step up and talk about coordinate transforms. I believe that you will have to translate the coordinate system, OR not place it at (0,0)... So if you place the image at (-ImageWidth/2, -ImageHeight/2) that should be right, or you can translate the coordinate system by half the Image height and width.

Hopefully someone who knows a bit more about GDI+ can tell us if I am right. (else you have to wait until I have time to play with it and see).


waiting.........IPB Image
then what, how do you move the image to where you want it.

gr.RotateTransform(45); this looks like is rotating the hdc .



thanks

This post has been edited by Lamefif: 7 Jun, 2007 - 05:43 AM
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Lamefif
RE: Image Rotation In GDI+
7 Jun, 2007 - 12:45 PM
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some enlightenment at the bottom of this page:

http://www.leunen.com/cbuilder/rotbmp.html

for anyone looking crazy.gif
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NickDMax
RE: Image Rotation In GDI+
7 Jun, 2007 - 09:34 PM
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thank you for the link. I have been meaning to get into GDI+ for a while now.
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