Vec vec_by_mouse(int x, int y) {
Vec ans = new Vec();
ans.x = (x - dim.width / 2.) / size;
ans.y = -(y - dim.height / 2.) / size;
return ans;
}
Vec wall_power(Ball p) {
Vec ans = new Vec();
is_colide = false;
ans.x = wall_power2(p.pos.x);
ans.y = wall_power2(p.pos.y);
if (is_colide) ans.sub_to(p.speed.mult(10));
return ans;
}
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;*/
}
void animate() {
dim = getSize();
size = (int) (Math.min(dim.height, dim.width) / 2.2);
timer.tell_time();
if (timer.time_diff == 0) return; // not enought time has passed, dont animate-crach fix
dragged_speed = dragged_vec.sub(last_dragged_vec).div(timer.time_diff);
last_dragged_vec = dragged_vec;
if (dragged_ball != -1) {
balls.get2(dragged_ball).pos = dragged_vec.add(find_offset).trim(-1, 1);
balls.get2(dragged_ball).speed = dragged_speed;
}
balls = new WorldAnimate().calc_new_frame(balls, springs, RADIUS, timer);
}
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;
}
int find_ball(Vec v) {
int num_balls = balls.size();
for (int i = 0; i < num_balls; i++) {
Ball p = balls.get2(i);
double dist = v.calc_dist(p.pos);
if (dist < RADIUS) {
// printf("found ball %d\n",i);
find_offset = p.pos.sub(dragged_vec);
// last_dragged_vec=v;
return i;
}
}
return -1;
}
Vec mult(double scalar) {
Vec ans = new Vec();
ans.x = x * scalar;
ans.y = y * scalar;
return ans;
}
Vec sub(Vec right) {
Vec ans = new Vec();
ans.x = x - right.x;
ans.y = y - right.y;
return ans;
}
Vec add(Vec right) {
Vec ans = new Vec();
ans.x = x + right.x;
ans.y = y + right.y;
return ans;
}
Vec div(double a) {
Vec ans = new Vec();
ans.x = x / a;
ans.y = y / a;
return ans;
}