surface_test.py 文件源码

def test_get_alpha(self):

        # __doc__ (as of 2008-06-25) for pygame.surface.Surface.get_alpha:

          # Surface.get_alpha(): return int_value or None
          # get the current Surface transparency value

        s1 = pygame.Surface((32,32), pygame.SRCALPHA, 32)
        self.assert_(s1.get_alpha() == 255)

        for alpha in (0, 32, 127, 255):
            s1.set_alpha(alpha)
            for t in range(4): s1.set_alpha(s1.get_alpha())
            self.assert_(s1.get_alpha() == alpha)

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