Vec calc_collide_power(Ball p1, Ball p2, double dist) {
if (dist > radius * 2) return new Vec(); // Friday, August 29, 2008 15:26:33: stickiness bug fix
Vec speed_diff = p2.speed.sub(p1.speed);
double force = 1000 * (dist - radius * 2);
Vec npos1 = p1.pos.div(dist); // normalized
Vec npos2 = p2.pos.div(dist);
force += 10 * speed_diff.dot_mult(npos2.sub(npos1));
Vec ans = npos2.sub(npos1).mult(force);
return ans;
/* colide_power_x=force*(x2-x1)/dist;
colide_power_y=force*(y2-y1)/dist;*/
}
Vec calc_spring_power(Ball p1, Ball p2) {
double dist = p1.pos.calc_dist(p2.pos);
// if (abs(dist-STRING_LEN)<.1)
// return;
Vec speed_diff = p2.speed.sub(p1.speed);
double force = 1000 * (dist - STRING_LEN);
Vec npos1 = p1.pos.div(dist); // normalized
Vec npos2 = p2.pos.div(dist);
force += 100 * speed_diff.dot_mult(npos2.sub(npos1));
Vec ans = npos2.sub(npos1).mult(force);
return ans;
// force*=force;
// colide_power_x=(x2-x1)/dist*force;
// colide_power_y=(y2-y1)/dist*force;
}