JoGL GUI/HUD

OpenGL Development JOGL Development
#1

In jogl, how does one make a gui/hud that is drawn ontop of the canvas? its something that I havent been able to crack yet. thanks for any help.

What im looking for is a way to draw at least a rectangle inside the canvas (or glpanel which ever) and be able to put components into it. It should be like a internal frame. again, thanks for any help.

#2

You’ll have to play with your modelview matrix. For example, after drawing all the 3D stuff, you just load the identity matrix again, and your canvas will stretch from (-1,-1) to (1,1) again. I believe. Please don’t take my word for it, look it up! You could do a little scaling, so the (0,0) coordinates are the top left of your screen, and e.g. (800,600) the bottom right. Then draw at will. ;D

#3

Draw your 3D-stuff, reset the projection matrix, change to orthographic projection using glOrtho, reset the modelview matrix, disable depth testing and draw the hud:


// draw your 3d-stuff
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
gl.glOrtho(left, right, bottom, top, znear, zfar);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glDisable(GL.GL_DEPTH_TEST);
// draw your hud
#4

ah thank you cylab and bahuman :slight_smile: i was wonderin how it was done, i’ll put it to use when i get back from work, thanks again :smiley:

#5

Well, wait a moment - is this HUD supposed to show Java components, or something that’s rendered from OpenGL?