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Shareware Grab Bag
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crobots.arc
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RABBIT.R
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1985-12-13
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1KB
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89 lines
/* rabbit */
/* rabbit runs around the field, randomly */
/* and never fires; use as a target */
main()
{
while(1) {
go(rand(1000),rand(1000)); /* go somewhere in the field */
}
} /* end of main */
/* go - go to the point specified */
go (dest_x, dest_y)
int dest_x, dest_y;
{
int course;
course = plot_course(dest_x,dest_y);
drive(course,25);
while(distance(loc_x(),loc_y(),dest_x,dest_y) > 50)
;
drive(course,0);
while (speed() > 0)
;
}
/* distance forumula */
distance(x1,y1,x2,y2)
int x1;
int y1;
int x2;
int y2;
{
int x, y;
x = x1 - x2;
y = y1 - y2;
d = sqrt((x*x) + (y*y));
return(d);
}
/* plot_course - figure out which heading to go */
plot_course(xx,yy)
int xx, yy;
{
int d;
int x,y;
int scale;
int curx, cury;
scale = 100000; /* scale for trig functions */
curx = loc_x();
cury = loc_y();
x = curx - xx;
y = cury - yy;
if (x == 0) {
if (yy > cury)
d = 90;
else
d = 270;
} else {
if (yy < cury) {
if (xx > curx)
d = 360 + atan((scale * y) / x);
else
d = 180 + atan((scale * y) / x);
} else {
if (xx > curx)
d = atan((scale * y) / x);
else
d = 180 + atan((scale * y) / x);
}
}
return (d);
}
/* end of rabbit.r */