1.7.2. DRAWING A CIRCLE TO FILL AN ENTIRE WINDOW

	program p72
	include 'PHIGS.H'

	integer circid, scenid, wkid, viewid
	real viewpt(4)
	data wkid , viewid, scenid, circid / 1,1, 10, 11 /
	data zoom, radius, xc,yc   / 1.0, 5.0, 15.,15. /
	data xmin,ymin, xmax,ymax  / 10.,10.,20.,20. /
	data viewpt /0.,1., 0.,1./
  
c---------------------------------------------------------------------
  
c	open PHIGURE and X-window type workstation (8887)*/
	call topph (6)
	call topwk (wkid,30,8887)

c	define 2D working domain
	call tdoma2 (xmin,ymin, xmax,ymax)

c	build circle 
	call tccr2 (circid, xc,yc, radius)

c	define scene
	call TSCENE (scenid,1,circid,viewid)
   
c	define a centered 2D view 
	call tviewc (wkid,viewid,1,1)
	call tv2cen (wkid,viewid,0.5,0.5,zoom,viewpt)
	
c	display scene on workstation
	call ppost (wkid,scenid,1.0)
	call prst (wkid,PALWAY)

c	close workstation and PHIGURE 
	call tclwk (wkid)
	call tclph 
	end

This program is identical to n° 1 with one additional call to TVIEWC