46 lines
819 B
C
46 lines
819 B
C
#ifndef lint
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static char sccsid[] = "@(#)line.c 1.1 94/10/31 SMI"; /* from UCB 4.1 6/27/83 */
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#endif
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#include "con.h"
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line(x0,y0,x1,y1){
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iline(xconv(xsc(x0)),yconv(ysc(y0)),xconv(xsc(x1)),yconv(ysc(y1)));
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return;
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}
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cont(x0,y0){
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iline(xnow,ynow,xconv(xsc(x0)),yconv(ysc(y0)));
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return;
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}
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iline(cx0,cy0,cx1,cy1){
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int maxp,tt,j,np;
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char chx,chy,command;
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float xd,yd;
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float dist2(),sqrt();
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movep(cx0,cy0);
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maxp = sqrt(dist2(cx0,cy0,cx1,cy1))/2.;
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xd = cx1-cx0;
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yd = cy1-cy0;
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command = COM|((xd<0)<<1)|(yd<0);
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if(maxp == 0){
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xd=0;
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yd=0;
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}
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else {
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xd /= maxp;
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yd /= maxp;
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}
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inplot();
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spew(command);
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for (tt=0; tt<=maxp; tt++){
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chx= cx0+xd*tt-xnow;
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xnow += chx;
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chx = abval(chx);
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chy = cy0+yd*tt-ynow;
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ynow += chy;
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chy = abval(chy);
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spew(ADDR|chx<<3|chy);
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}
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outplot();
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return;
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}
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