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593
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1 """Transforms to apply to images when they're loaded."""
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2
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3 from pygame.transform import rotate
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4 from pygame.locals import BLEND_RGBA_MULT, SRCALPHA
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5 from pygame.surface import Surface
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6
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7
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8 class Transform(object):
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9
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10 def __init__(self, func, *args):
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11 self._func = func
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12 self._args = args
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13
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14 def __call__(self, image):
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15 return self._func(image, *self._args)
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16
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17 def __hash__(self):
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18 return hash((id(self._func), self._args))
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19
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20 def __eq__(self, other):
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21 return (self._func is other._func) and self._args == other._args
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22
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23 def __repr__(self):
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24 return "<%s args=%r>" % (self.__class__.__name__, self._args)
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25
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26
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27 # transform that does nothing
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28 NULL = Transform(lambda x: x)
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29
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30 # base rotation transforms
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31 R90 = Transform(rotate, 90)
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32 R180 = Transform(rotate, 180)
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33 R270 = Transform(rotate, -90)
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34
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35
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36 # overlays
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37 class Overlay(Transform):
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38 """Overlay another image on top of the given one."""
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39
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40 def __init__(self, resources, image_name_fragments, blend=0):
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41 super(Overlay, self).__init__(
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42 self.overlay, resources, image_name_fragments, blend)
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43
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44 def overlay(self, image, resources, image_name_fragments, blend):
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45 image = image.copy()
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46 overlay = resources.load_image(image_name_fragments)
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47 image.blit(overlay, (0, 0), None, blend)
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48 return image
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49
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50
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51 # colour overlays
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52 class Colour(Transform):
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53 """Overlay an image with a colour."""
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54
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55 def __init__(self, colour, blend=BLEND_RGBA_MULT):
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56 super(Colour, self).__init__(self.colour, colour, blend)
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57
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58 def colour(self, image, colour, blend):
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59 image = image.copy()
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60 overlay = Surface(image.get_size(), SRCALPHA, image)
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61 overlay.fill(colour)
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62 image.blit(overlay, (0, 0), None, blend)
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63 return image
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