I want to limit drawing to a rectangular area of the screen, so that
if you draw an oval or something halfway in it, only half of the oval
gets drawn. What is the easiest way to do this?
My current solution is something like this:
pyglet.gl.glViewport(x1,y1,x2,y2)
pyglet.gl.glMatrixMode(pyglet.gl.GL_PROJECTION)
pyglet.gl.glLoadIdentity()
pyglet.gl.glOrtho(0, x2, 0, y2, -1, 1)
pyglet.gl.glMatrixMode(pyglet.gl.GL_PROJECTION)
It seems to work, except that it seems to be messing with other code
in a way that is difficult to explain. Also, I don't really know why
it works. Tips?
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