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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?

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1 Answer 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.

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+1 for a simple solution –  CyberneticTwerkGuruOrc Dec 26 '13 at 18:10

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