Re: [Plib-users] Question re PUI sizes & frames

[James F. <fr...@cs...>]

On Sun, 11 May 2008, Steve Baker wrote:

> Units (like in all of 3D graphics) are arbitary until you define your
> viewport and transformation stack.
>
> By default, PUI sets up the window such that one unit == one pixel.  But
> as soon as you override PUI's initial transform stack, you're setting
> what the units "mean" and your question becomes meaningless.


OK, maybe I'm asking the wrong question.  Let me make it more general: 
when I'm creating a menu from individual objects, how do I position them 
within the group?

To illustrate, Here's a snippet of code from a test program, in which I'm 
trying to create a menu group with a few items.  Added functions should 
allow 3D position, rotation, and scaling.  I'm trying to position the 
items in the group so they pack vertically.  (getStringSize is a function 
added to get the size of a string in the vector font.)


   G1 = new puGroup (0, 0);
   G1->Add3DLocation (x, y, z, 0.0, 0.0, 0.0);

   G1->getStringSize (&ww, &hh, "Say Hello");
   printf ("ww = %d, hh = %d\n", ww, hh);
   w = ww;
   h = hh;
   G1->getStringSize (&ww, &hh, "Say Goodbye");
   printf ("ww = %d, hh = %d\n", ww, hh);
   if (ww > w) w = ww;
   if (hh > h) h = hh;
   w += 16;
   h += 8;

   b1 = new puOneShot (0, 0, w, h);
   b2 = new puOneShot (0, -2 * h, w, -h);
   bx = new puButtonBox (0, -7 * h, w, -3 * h, bxLabels, 1);


//G1->recalc_bbox ();
   G1->setSize (w, 7 * h);
   G1->close ();

So I run this, and it gives me the items, but with a vertical space 
between each about equal to the height.  With different parameters, I 
might get boxes on top of one another.  Also, when I use the recalc_bbox 
function, it doesn't seem to calculate the bounding box of all the items, 
just the first, as the rotation &c are all around the center of the "Say 
Hello" box rather than around the center of G1.

I must be missing something important here, but what?

Thanks,
James