After reading those threads, I tried another way to "cut" a sprite (ie only
display some part of it) :
https://groups.google.com/forum/?fromgroups#!topic/cocos-discuss/Ks83VdBj9Wk%5B1-25%5D
https://groups.google.com/forum/?fromgroups#!topic/cocos-discuss/vUZOwNZW_GY%5B1-25%5D
Here's what I came up with for cutting the top of a sprite (the only thing
I'm actually interested in) :
class Cut_Sprite(cocos.sprite.Sprite):
def __init__(self,*args,**kwargs):
super(Cut_Sprite,self).__init__(*args,**kwargs)
self.tex_scale = self.width/self._vertex_list.tex_coords[3] #used
to convert pixels to texture coords
def cut(self,desired_height):
desired_height=int(desired_height)#needs int
self._vertex_list.vertices[5]=self.y+desired_height
self._vertex_list.vertices[7]=self.y+desired_height
self._vertex_list.tex_coords[7]=desired_height/self.tex_scale
self._vertex_list.tex_coords[10]=desired_height/self.tex_scale
What do you think of such a solution ? I'm a newbie, I don't know anything
about openGL, so I guess there are other/better solutions (some are
mentionned in the threads I mentionned earlier), but this one works both
inside and outside a batch.
here's a small test-app : http://pastebin.com/xmn0KERe
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