问题
I've got a sprite group which needs to be drawn in a certain order so its sprites overlap as they should.
However even when sorting the group using operator module function (sorted(self.sprites, key=attrgetter('y','x')) the order is wrong.
How can I fix this behaviour?
回答1:
Straightforwardly, you can't:
The Group does not keep sprites in any order, so the draw order is arbitrary.
Use an OrderedUpdates group instead:
This class derives from
pygame.sprite.RenderUpdates- Group class that tracks dirty updates. It maintains the order in which the Sprites were added to the Group for rendering. This makes adding and removing Sprites from the Group a little slower than regular Groups.
Alternatively, you can keep different 'layers' of sprites in different groups, keeping the order of groups correct.
来源：https://stackoverflow.com/questions/13675741/pygame-drawing-order-for-sprite-group-with-sprite-renderplain