painting on demand and continuously in a GLCanvas

Hi all,

I have two separate GLCanvases which I need to have painting on demand and also painting continuously in both.
Because I have a red point which can be dragged by mouse(It has to be painted continuously ) and a contour plot which is changed when ever the function is changed(paint on demand because its rendering needs lots of time), Is it possible to have both methods in each canvas?

Thank in advance =)

Hi

You can use distinct animators for your canvases, one painting continuously and another one painting on demand. You can override an existing animator to paint only on demand.

On 03/14/2013 10:09 AM, gouessej [via jogamp] wrote:
> Hi
>
> You can use distinct animators for your canvases, one painting continuously
> and another one painting on demand. You can override an existing animator to
> paint only on demand.

.. or could simply call pause() and resume() to trigger the 'on demand',
as you wish.

If you implement your own .. pls derive from GLAnimatorControl and
read it's references in GLAutoDrawable carefully.

~Sven

Sven Gothel wrote

.. or could simply call pause() and resume() to trigger the 'on demand',
as you wish.

Excellent idea, it is more simple than implementing another animator.

Thank you for reply, But  I have to apply both method in each canvas, it means that in first canvas there is a contour plot (paint on demand) and also a dragging point (paint continuously) the same for the second canvas.
If I use pause() it prevents to show the dragging point by mouse until it resume()?????

On 03/14/2013 10:48 AM, don [via jogamp] wrote:
> Thank you for reply, But  I have to apply both method in each canvas, it means
> that in first canvas there is a contour plot (paint on demand) and also a
> dragging point (paint continuously) the same for the second canvas.
> If I use pause() it prevents to show the dragging point by mouse until it
> resume()?????

use 2 Animators ..

~Sven

You can modify your drawing code to draw the plot once, store it in a texture or use a FBO and display this texture in order to avoid continuously performing the rendering of the plot when it hasn't changed. Use GLOffscreenAutoDrawable. You can't use 2 animators as each canvas contains elements painted continuously and elements painted on demand.

You mean that two animators for each canvas it means four animators for my program?
Is it possible in Java? It is my first project which I use Java.

I do not how to do that =( could you please introduce me a site or a similar example code?

Please look at the Java documentation of JOGL. You can simply draw your plot on a GLOffscreenAutodrawable, it's just another drawable, there is nothing fancy. I think that there is an example using it on the Github repository.

You can look at this example.

is it related to JOGL 2 because I am working with JOGL 1? there is no GLOffscreenAutoDrawable in its package?

Yes, you have to switch to JOGL 2.0 if you want to use GLOffscreenAutoDrawable.

is there another way in JOGL 1?

There is no trivial way to do the same thing in JOGL 1. This class allows to manipulate pixmaps, pbuffers and FBOs very easily. Don't expect to get lots of advises on how to use JOGL 1. You should really switch to JOGL 2, it isn't very difficult and it will be less risky than sticking to JOGL 1. If you find a major bug in JOGL 1, we won't be able to help you.