plib-users

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

[John F. F. <joh...@cy...>]

James,

	If I remember correctly, PUI uses pixels as its units of distance.  The 
origin is the lower left-hand corner of the screen (or group), the x-axis 
extends to the right, and the y-axis extends upwards.

	Yes, you do have to create the frame first, before creating the buttons. 
 It is possible, though, to resize the frame after the buttons have been 
created.

		- John


-----Original Message-----
From:	James Frye
Sent:	Sunday, May 11, 2008 11:45 AM
To:	PLIB Users
Subject:	[Plib-users] Question re PUI sizes & frames


Hi,

I'm making some progress on modifying PUI to work with VR, but have a
couple more questions.  After a few modifications (such as replacing the
bitmapped text with GLUT vector fonts), I've got groups containing buttons
and such that I can move around & rotate at will.  Now I want to add a
nice frame around a group, but it seems that I have to create the frame
before creating the objects that go in it.  IOW the code needs to look
something like

   group = new puGroup (size...)
   frame = new puFrame (x1, y1, x2, y2);
   button1 = new puButton (x, y, label);
   button2 = new puButton (x, y, label);
   group->close ();

The problem is how to know the dimensions for frame before I create at
least one button, and find its size?

That leads to a larger question: what does PUI use as its internal
coordinate system?  At some point I'll need to add scaling of the PUI
coordinate system to the VR one, so that the menus appear at virtual world
sizes.  I'd rather not do this by trial & error, but I don't understand
the internal coordinates from the code.

Thanks,
James


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

[Steve B. <st...@sj...>]

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.

John F. Fay wrote:
> James,
> 
> 	If I remember correctly, PUI uses pixels as its units of distance.  The 
> origin is the lower left-hand corner of the screen (or group), the x-axis 
> extends to the right, and the y-axis extends upwards.
> 
> 	Yes, you do have to create the frame first, before creating the buttons. 
>  It is possible, though, to resize the frame after the buttons have been 
> created.

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