class CAR {
  PVector loc = new PVector(random(0,width),random(150,height));

  PVector acc = new PVector(0,0);
  PVector vel = new PVector(0,0);
  int dim = 20;
  float maxSpeed = 4.0;
  boolean collide = false;
  
  CAR() {



  }


  void create(){
    smooth();
    // loc = new PVector(mouseX, mouseY);
    ellipse(loc.x,loc.y, dim, dim); 

  }

  void move(){
  PVector acc = new PVector(0,0);
    PVector target = new PVector(width/2,0);

    PVector diff = PVector.sub(target,loc);
    diff.normalize();
    float factor = 1.0;  
    diff.mult(factor);
    acc.add(diff);

if(loc.y-15>0){
      loadPixels();
     // println(get(int(loc.y)-1,int(loc.x)));

if(pixels[int(loc.y-11)*width+int(loc.x)] < -1){

acc.y += 2;

}
}else{
  
 loc.y = height; 
 loc.x = random(0,width);
}
if(collide == true){
 acc.y += 2; 

  
}
    
    vel.add(acc);
    if (vel.mag() > maxSpeed) {
      vel.normalize();
      vel.mult(maxSpeed);
    }
    if(loc.y < 0-dim){
      vel = new PVector(0,0);
    }


    loc.add(vel);
   
  }

PVector componentVector (PVector vector, PVector directionVector) {
  //--! ARGUMENTS: vector, directionVector (2D vectors)
  //--! RETURNS: the component vector of vector in the direction directionVector
  //-- normalize directionVector
  directionVector.normalize();
  directionVector.mult(vector.dot(directionVector));
  return directionVector;
}

void collideEqualMass(CAR t) {
float distanceBetween = t.loc.dist(loc);

if(distanceBetween<15){
 collide=true; 
     
 PVector n = PVector.sub(t.loc,loc);
      n.normalize();
      
      // Difference of velocities so that we think of one object as stationary
      PVector u = PVector.sub(vel,t.vel);
      
      // Separate out components -- one in direction of normal
      PVector un = componentVector(u,n);
      // Other component
      u.sub(un);
      // These are the new velocities plus the velocity of the object we consider as stastionary
      vel = PVector.add(u,t.vel);
      t.vel = PVector.add(un,t.vel);
    //  println(vel);
      //println(t.vel);
    
}else{
 collide = false; 
}
}

}