sorry about that : ) by the way i just want to say thank you so very much. I dont think I could have done it without you, and everyone else who helped me. I hope karma come back ten fold, you odnt know m=how much this saved my rear. Thank You!!!!!

im still wondering wheather or not to have a small line on each ball that points in the direction the UP button "force" would push it. so left and right arrows are to turn the ball's heading and up is to push it in that direction...im working on that one right now...

ok.. i'm going to bed right now but let me offer you some last tidbits of advice:

here is code that shows how to "extend" a vector. that is increase it's magnitude.  change 30 to whatever value you want to increase (or decrease) it by.  you can use this to accelerate and decelerate by extending the velocity vector, causing the ball to get faster while remaining straight.

turning i'm too tired to think through, but it will involve applying the vector to a different angle. try just offsetting a by the desired amount of turn. remember processing works in radians by default.

ok goodnight! goodluck!

Code:

PVector y, v, v2;

void setup(){
  size(200,200);
  y = new PVector(0,1);//y-axis
  v = new PVector(10,20);//the original vector
  v2 = new PVector();//resulting vector
  line(100,100,100+v.x,100+v.y);
  v2 = v.get();
  float a = PVector.angleBetween(y,v);
  println(a);
 // v2.add(cos(a)*30,sin(a)*30, 0);
 v2.x += sin(a)*30;
 v2.y += cos(a)*30;
  println("cos(a) * 30: " + cos(a) * 30);
    println("sin(a) * 30: " + sin(a) * 30);
  stroke(0,0,255);
  line(50,100,50+v2.x,100+v2.y);//show the new vector
  stroke(0,255,0);
  line(100,100,100+v.x,100+v.y);//show the original
}
 

p.s. use PVector.limit() for max speed.