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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include <gset.h>
include <gio.h>
include "glabax.h"
# GLB_PLOT_TITLE -- Draw plot title block. The block may contain several lines.
# Lines are plotted with center, left, or right justification, immediately
# above the top viewport boundary (not immediately above the drawn axis,
# which need not be at the viewport boundary).
procedure glb_plot_title (gp, title, ntitlelines)
pointer gp # graphics descriptor
char title[ARB] # title block
int ntitlelines # number of lines in title block
int lineno, ip, wcs
real char_height, x, y, dy
pointer sp, op, lbuf, format, w
real ggetr()
begin
if (title[1] == EOS || ntitlelines < 1)
return
call smark (sp)
call salloc (lbuf, SZ_LINE, TY_CHAR)
call salloc (format, SZ_FORMAT, TY_CHAR)
char_height = ggetr (gp, "ch")
if (char_height < EPSILON)
char_height = DEF_CHARHEIGHT * GP_TITLESIZE(gp)
wcs = GP_WCS(gp)
w = GP_WCSPTR (gp, wcs)
y = min (1.0 - char_height,
WCS_SY2(w) + (ntitlelines - 1 + 0.5) * char_height)
call sprintf (Memc[format], SZ_FORMAT, "hj=%c,vj=b")
switch (GP_TITLEJUST(gp)) {
case GT_LEFT:
call pargi ('l')
x = WCS_SX1(w)
case GT_RIGHT:
call pargi ('r')
x = WCS_SX2(w)
default:
call pargi ('c')
x = (WCS_SX1(w) + WCS_SX2(w)) / 2.0
}
call gsetr (gp, G_TXSIZE, GP_TITLESIZE(gp))
call gseti (gp, G_WCS, 0)
lineno = 1
op = lbuf
for (ip=1; title[ip] != EOS; ip=ip+1)
if (title[ip] == '\n' || (title[ip+1] == EOS && op > lbuf)) {
if (title[ip] != '\n') {
Memc[op] = title[ip]
op = op + 1
}
Memc[op] = EOS
dy = (lineno - 1) * char_height
call gtext (gp, x, y - dy, Memc[lbuf], Memc[format])
lineno = lineno + 1
op = lbuf
} else {
Memc[op] = title[ip]
op = op + 1
}
call sfree (sp)
end
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