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define DUMMY 6
# EP_SURFACE -- Draw a perspective view of a surface. The altitude
# and azimuth of the viewing angle are variable.
procedure ep_surface(gp, data, ncols, nlines, angh, angv)
pointer gp # GIO pointer
real data[ncols,nlines] # Surface data to be plotted
int ncols, nlines # Dimensions of surface
real angh, angv # Orientation of surface (degrees)
int wkid
pointer sp, work
int first
real vpx1, vpx2, vpy1, vpy2
common /frstfg/ first
common /noaovp/ vpx1, vpx2, vpy1, vpy2
begin
call smark (sp)
call salloc (work, 2 * (2 * ncols * nlines + ncols + nlines), TY_REAL)
# Initialize surface common blocks
first = 1
call srfabd()
# Define viewport.
call ggview (gp, vpx1, vpx2, vpy1, vpy2)
# Link GKS to GIO
wkid = 1
call gopks (STDERR)
call gopwk (wkid, DUMMY, gp)
call gacwk (wkid)
call ezsrfc (data, ncols, nlines, angh, angv, Memr[work])
call gdawk (wkid)
# We don't want to close the GIO pointer.
#call gclwk (wkid)
call gclks ()
call sfree (sp)
end
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