2D Image Rotation

[Marleys Ghost]

I have had a couple of requests as to how I managed the rotating compass graphic seen in some of my demo videos.

 

 

 

BlitzMax has direct OpenGL support so you can use BlitzMax for direct OpenGL programming. I simply created a function that can be called the same way as other 2D drawing commands.

 

Function DrawAndRotateImage(itr:TTexture, Ax:Int, Ay:Int, Sx:Int, Sy:Int, Ir:Float)	
glMatrixMode(GL_TEXTURE)
glLoadIdentity()
glTranslatef(0.5,0.5,0)
glRotatef(Ir,0,0,1)
glTranslatef(-0.5,-0.5,0)
glMatrixMode(GL_MODELVIEW)
glEnable itr.Target()
itr.Bind()
itr.Clamp(1,1,1)
DrawRect(Ax,Ay,Sx,Sy)
glDisable(GL_TEXTURE_2D) 
End Function

 

The function works the same as DrawImage but has the extra parameter for rotation (Ir:Float)

 

Draws a texture on screen. The image rectangle will start at the specified coordinate (Ax:Int, Ay:Int) and the image will be stretched to match the specified width and height (Sx:Int, Sy:Int) and rotated (Ir:Float).

[macklebee]

cool stuff, MG... thanks for sharing!

[cocopino]

Nicely done MG.

Also, I like the AI trying to flank you (from 0:55). Good stuff!