1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <gki.h>
include "sgi.h"
# SGI_POLYMARKER -- Draw a polymarker. The polymarker is defined by the array
# of points P, consisting of successive (x,y) coordinate pairs.
procedure sgi_polymarker (p, npts)
short p[ARB] # points defining line
int npts # number of points, i.e., (x,y) pairs
pointer pm
int i, len_p
int x, y, oldx, oldy
include "sgi.com"
begin
if (npts <= 0)
return
len_p = npts * 2
# Keep track of the number of drawing instructions since the last frame
# clear.
g_ndraw = g_ndraw + 1
# Update polymarker attributes if necessary.
pm = SGI_PMAP(g_kt)
if (SGI_TYPE(g_kt) != PM_LTYPE(pm)) {
call sgi_linetype (PM_LTYPE(pm))
SGI_TYPE(g_kt) = PM_LTYPE(pm)
}
if (SGI_WIDTH(g_kt) != PM_WIDTH(pm)) {
call sgk_linewidth (g_out, nint (GKI_UNPACKREAL(PM_WIDTH(pm))))
SGI_WIDTH(g_kt) = PM_WIDTH(pm)
}
if (SGI_COLOR(g_kt) != PM_COLOR(pm)) {
call sgi_color (PM_COLOR(pm))
SGI_COLOR(g_kt) = PM_COLOR(pm)
}
# Draw the polymarker.
oldx = 0; oldy = 0
for (i=1; i <= len_p; i=i+2) {
x = p[i]; y = p[i+1]
if (x != oldx || y != oldy) {
call sgk_move (g_out, x, y)
call sgk_draw (g_out, x, y)
}
oldx = x; oldy = y
}
end
|
