Hi,
(Take 2 on my question to the list; first attempt went to wrong addy.)
I am trying to make sense of pyClutter 1.0. Could anyone point me to an
example (or post one) that shows clipping from a path applied to child
objects?
For example: A star shape that contains a bunch of moving rectangles
which will travel/size/rotate with the star, but are clipped to the
shape of the star.
I suspect this will involve a custom clutter.Group class of some kind,
with cogl paths and an on_paint() method, but I can find no headway on
the web so far.
I have this code so far:
import clutter
from clutter import cogl
x,y=0,0
def boo(tl,frame,obj):
global x,y
obj.set_position(x, y)
def xy(obj,evt):
global x,y
x,y = evt.x,evt.y
class G(clutter.Group):
"""
Attempt to make a Group that can clip its children to a path.
"""
def __init__(self,*args):
clutter.Group.__init__(self,*args)
#self.set_clip(0,0,10,10) # works, but not for a path.
#Not sure why I need to connect here, on_paint is a method
#of clutter.Group, but overriding it does not make it happen
self.connect("paint",self.do_paint)
self._color = clutter.Color(255,200,100)
def do_paint(self, args):
width,height=200,200
cogl.path_move_to(width / 2, 0)
cogl.path_line_to(width, height)
cogl.path_line_to(0, height)
cogl.path_line_to(width / 2, 0)
cogl.path_close()
## Colour me lost from here...
cogl.clip_push_from_path()
clutter.Group.do_paint(self)
cogl.clip_pop()
def main():
global group1
stage = clutter.Stage()
stage.set_size(500, 500)
stage.set_color(clutter.color_from_string("#FFF"))
rect1, rect2, rect3 = clutter.Rectangle(), clutter.Rectangle(),
clutter.Rectangle()
group1, group2, group3 = G(), clutter.Group(), clutter.Group()
#Some kind of parent-child thing to work with
group1.add(rect1, group2)
group2.add(rect2, group3)
group3.add(rect3)
group1.set_position(100, 100)
group2.set_position(100, 100)
group3.set_position(100, 100)
rect1.set_position(0, 0)
rect2.set_position(0, 0)
rect3.set_position(0, 0)
rect1.set_size(150, 150)
rect2.set_size(150, 150)
rect3.set_size(150, 150)
rect1.set_color(clutter.color_from_string("#FF000090"))
rect2.set_color(clutter.color_from_string("#00FF0090"))
rect3.set_color(clutter.color_from_string("#0000FF90"))
stage.add(group1)
stage.show_all()
group1.show_all()
group2.show_all()
group3.show_all()
stage.connect("key-press-event", clutter.main_quit)
stage.connect('destroy', clutter.main_quit)
stage.connect('motion-event', xy)
path = clutter.Path('M 0 0 L 300 0 L 300 300 L 0 300z')
timeline = clutter.Timeline(4000)
timeline.set_loop(True)
alpha = clutter.Alpha(timeline,clutter.EASE_OUT_SINE)
p_behaviour = clutter.BehaviourPath(alpha, path)
path.add_move_to(0, 0)
p_behaviour.apply(group3)
timeline.add_marker_at_time("foo",2000)
timeline.start()
t=clutter.Timeline(1000)
t.set_loop(True)
t.connect('new-frame', boo, group1) #move the top group around some
t.start()
clutter.main()
if __name__ == '__main__':
main()
Hope you can help!
\d
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