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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <gki.h>
include "../lib/ids.h"
# nspp particulars
# base width of line
define BASELW 8
# IDS_POLYLINE -- Draw a polyline. The polyline is defined by the array of
# points P, consisting of successive (x,y) coordinate pairs. The first point
# is not plotted but rather defines the start of the polyline. The remaining
# points define line segments to be drawn.
procedure ids_polyline (p, npts)
short p[ARB] # points defining line
int npts # number of points, i.e., (x,y) pairs
pointer pl
int i, len_p
int linewidth
include "../lib/ids.com"
begin
if ( npts <= 0)
return
len_p = npts * 2
# Update polyline attributes if necessary.
pl = IDS_PLAP(i_kt)
if (IDS_TYPE(i_kt) != PL_LTYPE(pl)) {
call ids_line(PL_LTYPE(pl))
IDS_TYPE(i_kt) = PL_LTYPE(pl)
}
if (IDS_WIDTH(i_kt) != PL_WIDTH(pl)) {
linewidth = int(real(BASELW) * GKI_UNPACKREAL(PL_WIDTH(pl)))
i_linewidth = max(1,linewidth)
IDS_WIDTH(i_kt) = PL_WIDTH(pl)
}
if (IDS_COLOR(i_kt) != PL_COLOR(pl)) {
i_linecolor = PL_COLOR(pl)
IDS_COLOR(i_kt) = PL_COLOR(pl)
}
# Move to the first point. point() will plot it, which is
# ok here, and vector may well plot it again.
call ids_point(p[1], p[2], true)
# Draw the polyline.
for (i=3; i <= len_p; i=i+2) {
call ids_vector ( p[i], p[i+1])
}
end
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