date and time created 83/06/27 14:09:04 by sam

SCCS-vsn: lib/libplot/t300/line.c 4.1

diff --git a/usr/src/lib/libplot/t300/line.c b/usr/src/lib/libplot/t300/line.c
new file mode 100644 (file)
index 0000000..4f24e8b
--- /dev/null
+++ b/usr/src/lib/libplot/t300/line.c
@@ -0,0 +1,49 @@
+#ifndef lint
+static char sccsid[] = "@(#)line.c     4.1 (Berkeley) %G%";
+#endif
+
+#include "con.h"
+line(x0,y0,x1,y1){
+       iline(xconv(xsc(x0)),yconv(ysc(y0)),xconv(xsc(x1)),yconv(ysc(y1)));
+               return;
+}
+cont(x0,y0){
+       iline(xnow,ynow,xconv(xsc(x0)),yconv(ysc(y0)));
+       return;
+}
+iline(cx0,cy0,cx1,cy1){
+       int maxp,tt,j,np;
+       char chx,chy;
+       float xd,yd;
+       float dist2(),sqrt();
+               movep(cx0,cy0);
+               maxp = sqrt(dist2(cx0,cy0,cx1,cy1))/2.;
+               xd = cx1-cx0;
+               yd = cy1-cy0;
+               if(xd >= 0)chx = RIGHT;
+               else chx = LEFT;
+               if(yd >= 0)chy = UP;
+               else chy = DOWN;
+               if(maxp==0){
+                       xd=0;
+                       yd=0;
+               }
+               else{
+                       xd /= maxp;
+                       yd /= maxp;
+               }
+               inplot();
+               for (tt=0; tt<=maxp; tt++){
+                       j= cx0+xd*tt-xnow;
+                       xnow += j;
+                       j = abval(j);
+                       while(j-- > 0)spew(chx);
+                       j = cy0+yd*tt-ynow;
+                       ynow += j;
+                       j = abval(j);
+                       while(j-- > 0)spew(chy);
+                       spew ('.');
+               }
+               outplot();
+               return;
+}