iline(cx0,cy0,cx1,cy1){
int maxp,tt,j,np;
char chx,chy,command;
float xd,yd;
float dist2(),sqrt();
movep(cx0,cy0);
maxp = sqrt(dist2(cx0,cy0,cx1,cy1))/2.;
xd = cx1-cx0;
yd = cy1-cy0;
command = COM|((xd<0)<<1)|(yd<0);
if(maxp == 0){
xd=0;
yd=0;
}
else {
xd /= maxp;
yd /= maxp;
}
inplot();
spew(command);
for (tt=0; tt<=maxp; tt++){
chx= cx0+xd*tt-xnow;
xnow += chx;
chx = abval(chx);
chy = cy0+yd*tt-ynow;
ynow += chy;
chy = abval(chy);
spew(ADDR|chx<<3|chy);
}
outplot();
return;
}
void
iline(int cx0, int cy0, int cx1, int 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;
}