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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <gset.h>
include <gio.h>
# GMARK -- Draw a marker of the indicated type and size. A mark is represented
# as a polyline normalized to the unit square. Drawing a mark is a simple
# matter of drawing this normalized polyline in a window the size and position
# of the mark. While the mark window defines the transformation upon the
# normalized marker polyline, clipping is performed on the WCS viewport boundary
# (if enabled), independently of the size and position of the mark. Redrawing
# a mark with a linetype of clear will erase the mark, device permitting.
# Drawing is carried out in world coordinates, hence the marker shape will
# relect logarithmic scaling if in effect.
procedure gmark (gp, x, y, marktype, xsize, ysize)
pointer gp # graphics descriptor
real x, y # world coordinates of center of marker
int marktype # type of marker to be drawn
real xsize, ysize # marker size in X and Y
int i, m, fill
int and()
include "markers.inc"
begin
# The point marker type cannot be combined with the other types and
# is treated as a special case. The remaining markers are drawn
# using GUMARK, which draws marks represented as polygons
if (marktype == GM_POINT || (xsize == 0 && ysize == 0)) {
call gpl_settype (gp, POLYMARKER)
call gamove (gp, x, y)
call gadraw (gp, x, y)
call gpl_settype (gp, POLYLINE)
} else {
# Some marks can be drawn using area fill.
if (and (marktype, GM_FILL) != 0)
fill = YES
else
fill = NO
# Draw and overlay each mark. The polylines for the standard
# marks are stored in MPX and MPY at offsets MXO and MYO.
do i = GM_FIRSTMARK, GM_LASTMARK
if (and (marktype, 2 ** i) != 0) {
m = i - GM_FIRSTMARK + 1
call gumark (gp, mpx[moff[m]], mpy[moff[m]], mnpts[m],
x, y, xsize, ysize, fill)
}
}
end
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