On Aug 16, 4:36 am, claudio canepa <[email protected]> wrote:
> On Sat, Aug 15, 2009 at 5:46 AM, jaber <[email protected]> wrote:
>
> > Then how do I implement some class based on cocosnode to do the same
> > thing?
> > I mean, just use simple OpenGL draw functions. (glVertex, glColor,
> > etc)
>
> > I just can't get used to subclassing Cocosnode yet
> > I tried many times but eventually messed up the cocos2d-opengl
> > rendering, then it won't show up
>
> > A CocosNode designed to draw something must care about:
>
> 1. get or sintethize the vertexes
> 2. get additional parameters ( colors, textures,...)
> 3. draw:
> i. set the appropriate gl state.
> ii. apply the transform, caring to push-pop the matrix
> iii. use the appropriate(d) gl function(s) to draw the object
>
> If your CocosNode subclass breaks other stock CocosNode objects drawing,
> then
> you may need to preserve some parts of gl state, using glPushAttrib with the
> appropriate flags before setting state and poping after drawing.
>
> I attached a very simple CocosNode subclass examples; for clarity it uses
> the gl inmediate mode to draw.
>
> I suggest you do your firsts CocosNode subclasses using inmediate mode; when
> you are sattisfied, if you tgink is too slow, then you can modify your code
> to use display lists or batches.
>
> And develop your subclass in a separate file, so that you will have simple
> code to ask for help.
> --
> claudio
>
> simple_cocosnodes.py
> 5KViewDownload
Thanks.
Anyway how do I smooth out the line?
I added these after self.transform():
glEnable (GL_LINE_SMOOTH)
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST)
glEnable(GL_BLEND)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
and it didnt work.
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