clip or mask

[Philippe]

Hello,

Is there a way to clip a cocos2d Sprite ? (or mask, same thing, but
different word).

thank you,
Philippe

[Philippe]

Is this the best way to do it ?


class MySprite(Sprite):

def __init__(self):
super(MySprite, self ).__init__('my_sprite.png')
self.gap = 100

def draw(self):
pyglet.gl.glScissor(self.x-self.width/2, self.y-self.height/2,
self.width - self.gap, self.height)
pyglet.gl.glEnable(pyglet.gl.GL_SCISSOR_TEST)
super(MySprite, self ).draw()
pyglet.gl.glDisable(pyglet.gl.GL_SCISSOR_TEST)

[Richard Jones]

Without resorting to shaders or very complex scene composition that's
the only way to do it.

Richard

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[Philippe]

It works well.
I will probably write a Sprite class that implement a mask if needed.
thank you!

On Feb 9, 12:12 am, Richard Jones <r1chardj0...@gmail.com> wrote:
> Without resorting to shaders or very complex scene composition that's
> the only way to do it.
>
>      Richard
>

[Philippe]

Hello again,

Is there a way to make it (mask) works with cocos's Layer ?
something like

class Layer1(Layer):

is_event_handler = True

def __init__(self, png):
super(Layer1, self ).__init__()
self.map = Sprite(png)
self.map.position = self.map.width/2, self.map.height/2
self.add(self.map)

def on_mouse_press(self, x, y, buttons, modifiers):
x, y = director.get_virtual_coordinates (x, y)
if self.map.contains(*self.parent.point_to_local((x, y))):
self.map.x += 10

def draw(self):
pyglet.gl.glScissor(10, 10, 300, 200)
pyglet.gl.glEnable(pyglet.gl.GL_SCISSOR_TEST)
super(Layer1, self ).draw()
pyglet.gl.glDisable(pyglet.gl.GL_SCISSOR_TEST)

This does not work.

Should I use another type of Layer ?
No way to make it work ?

[claudio canepa]

On Mon, Feb 13, 2012 at 11:43 AM, Philippe <philipp...@gmail.com> wrote:

Hello again,

Is there a way to make it (mask) works with cocos's Layer ?
something like

class Layer1(Layer):

   is_event_handler = True

   def __init__(self, png):
       super(Layer1, self ).__init__()
       self.map = Sprite(png)
       self.map.position = self.map.width/2, self.map.height/2
       self.add(self.map)

   def on_mouse_press(self, x, y, buttons, modifiers):
       x, y = director.get_virtual_coordinates (x, y)
       if self.map.contains(*self.parent.point_to_local((x, y))):
           self.map.x += 10

   def draw(self):
       pyglet.gl.glScissor(10, 10, 300, 200)
       pyglet.gl.glEnable(pyglet.gl.GL_SCISSOR_TEST)
       super(Layer1, self ).draw()
       pyglet.gl.glDisable(pyglet.gl.GL_SCISSOR_TEST)

This does not work.

Should I use another type of Layer ?
No way to make it work ?

I think you want to override .visit() and not .draw()

Look at both methods in cocosnode.py

--

claudio

 

[claudio canepa]

Also, ScrollingManager, a subclass of Layer, uses scissors to limit the drawing (look for the parameter viewport). If you are going to do scrolling, you can use the scissors included, or look at the code as scissor example.

--

claudio

[Philippe]

.visit() is perfect !
thanks again for your help.

I will check later the advantage of using the scrollingManager.


On 13 fév, 22:30, claudio canepa <ccanep...@gmail.com> wrote:
> On Mon, Feb 13, 2012 at 6:18 PM, claudio canepa <ccanep...@gmail.com> wrote: