[PD] Drawing a sine function dynamically in Gem

[Roman Haefeli]

On Mit, 2013-04-10 at 22:28 +0200, Cyrille Henry wrote:
> hello,
> 
> you just have to put the gemhead in the gemlist befor the glBegin.
> see attachement.

Got it. Thanks.

Roman

> Le 10/04/2013 22:11, Roman Haefeli a écrit :
> > On Mit, 2013-04-03 at 11:59 +0200, Cyrille Henry wrote:
> >> hello,
> >>
> >> you have lot's of solution to draw a sinus curve in Gem.
> >
> > [...]
> >
> >> you can also do like in openGL : using GEMglBegin, GEMglVextex (many
> >> of them thanks to an iterative loop), and GEMglEnd
> >
> > I'm interested in understanding that approach. So far I was able to draw
> > a simple line:
> >
> > [gemhead]
> > |
> > [GEMglBegin GL_LINES]
> > |
> > [GEMglVertex2d -2 -2]
> > |
> > [GEMglVertex2d 2 2]
> > |
> > [GEMglEnd]
> >
> > But how are you creating an iterative loop out of this? I tried after
> > GEMglBegin:
> >
> > [t a b a]
> > |    |   \
> > |    [20( \
> > |    |     \
> > |    [until]\
> > |    |       \
> > |    [gemlist ]
> > |    |          <- put the two [GEMglVertex2d] here.
> > |
> > [GEMglEnd]
> >
> > However, this causes an error on every frame:
> > GL: invalid operation
> >
> > What is the correct way to do this?
> >
> > Roman
> >
> >
> >
> >> Le 02/04/2013 23:18, Alexandros Drymonitis a écrit :
> >>> I want to build this visual http://processing.org/learning/trig/ in Pd, but I want the sine curve to be drawn dynamically with every circle spin. It seems quite hard though.
> >>>
> >>> I don't know which object would be best. I tried either [curve] but the parameters are way too many and I'm not sure if precision is really possible. Then I tried [square 0.008] in combination with [repeat] but also doesn't work.
> >>> Anyone knows how to do this?
> >>>
> >>>
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