Bill, You're going right over my head. Can you show how a verb like "white" can change the background color to white, for example, or how a more general verb "background" can take a rgb vector argument? I'm not versed in callbacks, for example. Without such a feature "logo" style free inputs cannot be issued by the user. Unless you are saying a parser must be created that takes keystrokes like a_g_char does. With the old opengl I constructed verbs like `white` routinely.
Thanks, On Sat, Feb 29, 2020 at 7:16 PM bill lam <bbill....@gmail.com> wrote: > you can setup state for drawing outside paint event, but all actual drawing > must happen inside paint event, the verb a_g_paint, the callback verb. It > is useless if you call the verb from your code or copying the commands > inside and execute them from your code. > > For opengl drawing you need a opengl context. The opengl context is only > valid inside paint event . > > -- (B=) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
