Init

usr.lib/libplot/t300/line.c

@@ -0,0 +1,49 @@
+#ifndef lint
+static	char sccsid[] = "@(#)line.c 1.1 94/10/31 SMI"; /* from UCB 4.1 6/27/83 */
+#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;
+}