BallVector decode_balls(double y[]) {
BallVector ans = new BallVector();
for (int i = 0; i < num_balls; i++) {
Ball p = new Ball();
p.pos.x = y[i * 4 + 1];
p.pos.y = y[i * 4 + 2];
p.speed.x = y[i * 4 + 3];
p.speed.y = y[i * 4 + 4];
ans.addElement(p);
}
return ans;
}
void init_world() {
springs = new SpringVector(); // [num_springs];
add_spring(0, 1);
add_spring(1, 2);
add_spring(2, 0);
add_spring(3, 4);
add_spring(4, 5);
add_spring(5, 3);
add_spring(0, 4);
balls = new BallVector(); // [num_balls];
for (int i = 0; i < NUM_POINTS; i++) {
Ball p = new Ball();
init_rand(p);
balls.addElement(p);
}
}