Is there a way to add opacity to a shape?

no-reply@allegro.cc (AleX-G Squadron) — Wed, 12 Oct 2011 23:21:36 +0000

Hi guys!
I am searching for a way to create a square at the right of the screen in order to add points in there. Is there a way i can do this?
Also, the square must have an opacity(transparency).

no-reply@allegro.cc (Matthew Leverton) — Wed, 12 Oct 2011 23:23:24 +0000

Yes, it can be done. Use primitives with the proper colors and blender.

no-reply@allegro.cc (Dizzy Egg) — Thu, 13 Oct 2011 22:53:46 +0000

If your using Allegro 4.x you can use draw_trans_sprite after setting the blender; if your using Allegro 5 I'm stuck.

no-reply@allegro.cc (Thomas Fjellstrom) — Thu, 13 Oct 2011 23:30:33 +0000

Dizzy Egg said:

If your using Allegro 4.x you can use draw_trans_sprite after setting the blender; if your using Allegro 5 I'm stuck.

Actually, in allegro 4, if you're using the primitives, you want to call drawing_mode to setup translucent drawing.

no-reply@allegro.cc (Desmond Taylor) — Fri, 14 Oct 2011 00:20:02 +0000

and in Allegro 5 it's al_set_blender() and then al_draw_*()

no-reply@allegro.cc (Dizzy Egg) — Fri, 14 Oct 2011 02:48:58 +0000

Thomas, I thought it was set_trans_blender() ?? I smoke a lot

EDIT:

Ahh using primitives, sorry