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Re: [PyOpenGL-Users] 2D (Re: Bitmaps and Circles?)

 Re: [PyOpenGL-Users] 2D (Re: Bitmaps and Circles?) From: Mike C. Fletcher - 2004-04-27 05:43:57 ```snails@... wrote: ... > perfectly). Now the last portion of the engine - for the initial > release, at > least - is the whole graphic shpiel. > PyGame is very nice, I hope I'm not offending anyone - but it is, in my > experience, a bit slow. OpenGL is fast (the demos seemed promising, I > wrote > a few quick programs and liked the resulting fps), and I figured I > wouldn't > mind going through some hoops to get OpenGL's speed into an oo-2d > oriented > interface. Oh, then, go for it, but keep in mind that you're dealing with a system that thinks in terms of points, lines and triangles, so you're going to have to do your own tessellating (though there are some tools that will help with that, such as GLU). gluDisk gives you a simple filled circle if you set the inner radius to 0 setting gluQuadricDrawStyle to GLU_SILHOUETTE will give you empty circles (no fill) with gluDisk. You could also just use the sin and cos ufuncs from Numeric to generate coordinates and draw them using either an array-drawing call or a display list: a = arange(0.0,2*math.pi,.02) xes = sin(a) yes = cos(a) coords = zeros( (len(xes),3),'d') coords[:,0] = xes coords[:,1] = yes (the .02 there says to use .02 radians as the sampling rate, or around 1.1 degrees). As for drawing bitmaps, there's an ARB extension ARB.window_pos which gives simple positioning for bitmaps. There's also simple glDrawPixels (normally pretty slow) and loading a bitmap into a texture and displaying it on a properly-proportioned rectangle aligned with the screen (fast, and basically the "right" way to do it (IMO)). You might want to take a look at PyUI for sample code showing how to do this kind of stuff. IIRC it is using lots of simple orthogonal display of bitmaps, complex shapes (windows, text, etceteras) and is game-targeted. HTH, Mike _______________________________________ Mike C. Fletcher Designer, VR Plumber, Coder http://members.rogers.com/mcfletch/ ```