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From: jpg@nrc3d.nrc.uab.edu (Jill Gemmill)
Newsgroups: comp.sys.sgi
Subject: (none)
Message-ID: <9106212128.AA01337@nrc3d.nrc.uab.edu>
Date: 21 Jun 91 21:28:47 GMT
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Lines: 115

Subject: Re: changing window size under PROGRAM control

	Here are some suggestions I received.  
	Thanks to everyone who responded,
including:
  Brent L. Bates		      blbates@aero36.larc.nasa.gov
  Dan Karron, Research Associate      karron@nyu.edu 
  A. Chris Long, Jr.		      acl3k@virginia.edu


(1) StraightForward:

----- CUT HERE -----
# include <gl/gl.h>
# include <gl/device.h>

void redraw()
{
  reshapeviewport();
  color(WHITE);
  clear();
}

void main()
{
  long result;
  short val;
  char bigsize = 1;
  long x,y;

  prefsize(50, 50);
  winopen("size test");
  redraw();
  qdevice(ESCKEY);
  qdevice(SPACEKEY);

  do {
    result = qread(&val);
    switch (result) {
      case SPACEKEY: 
		     if (!val)
		       break;
		     getorigin(&x,&y);
		     if (bigsize) {
		       winposition(x,x+200,y,y+200);
		       prefsize(200,200);
		     }
		     else {
		       winposition(x,x+50,y,y+50);
		       prefsize(50,50);
		     }
		     winconstraints();
		     bigsize = !bigsize;
		     break;
      case REDRAW: redraw();
		   break;
    }
  } while (result != ESCKEY);
}
----- TO HERE -----


(2)

         getorigin(&xorigin,&yorigin);
         getsize(&xsize,&ysize);
         aspect=(float)xlen/(float)ylen;
         if(ysize*aspect>xsize) {
            ysize=(int)((float)xsize/aspect+0.5);
         }
         else {
            xsize=(int)((float)ysize*aspect+0.5);
         }
         keepaspect(xsize,ysize);
         winconstraints();
         viewport(0,xsize-1,0,ysize-1);
         winposition(xorigin,xorigin+xsize-1,yorigin,yorigin+ysize-1);

  The program reads in image files that can be different sizes.  Xlen & Ylen
are the size of the image in pixels.  This way the window is automatically
adjusted to the new image size.  Hope this helps.


(3) 
The documentation is muddy on this point. My memory also is not
as crisp as it should be. If you want to programatically resize your
window, you have to free the window constraints before you resize the window.
Use winconstraints(). You actually have to use it twice for some obscure reason,that perhaps being that there are two levels of values to free up. Then
you re-constrain the window to your new size and position. Note that
the specifications for a new window should be complete, i.e., you need to
re-pin all for corners, not just tell it to get bigger, or move from one
corner to another. 

I have some window manager hacks I like, in that I have macros that replace
gl window managers calls with private calls that keep a list of your windows
and their sizes. When you exit, it writes files containing the state of your
windows. When that program restarts, it checks for the state of its window
when it last exited/killed and restarts the windows with that. If you would 
like a copy, look on my anon ftp at karron.med.nyu.edu.



-------------------------------------------------------------------------------
    Jill Gemmill			    	
    Neurobiology Research Center	    INTERNET: jpg@nrc3d.nrc.uab.edu
    University of Alabama at Birmingham  
    Volker Hall G82E			    PHONE: 205-934-7111 
    Birmingham Alabama 35294-0019	    FAX: 205-934-6571
-------------------------------------------------------------------------------