void mousePressed(){
  if (mouseButton == LEFT){
    V_INPUT.activate_keyboardInput();
    LAMBDA_INPUT.activate_keyboardInput();
    RELATIVITY_INPUT.activate_menu();
    START.position();
    PAUSE.position();
    CHANGE_COLOUR.position();
  }
}

void mouseReleased(){
  if (mouseButton == LEFT){
    //If mouse is released on the drop down menu, update relativity boolean
    if (RELATIVITY_INPUT.return_value()!=-1){
      if (RELATIVITY_INPUT.return_value()==0){
        relativity = true;
      }
      else {
        relativity = false;
      }
      RELATIVITY_INPUT.close_menu();
    }
    if (START.return_value()==true){
      startSimulation = !startSimulation;
      if (startSimulation == false){
        x = 0;
        t = 0;
        v = 0;
        for (int i = Waves.size()-1; i>=0; i--){
          Waves.remove(i);
        }
        gamma = 0;
        pause = false;
      }
    }
    START.return_position();
    
    if (PAUSE.return_value()==true){
      pause = !pause;
    }
    
    //If mouse is released on change colour button, increament the pointer
    if (CHANGE_COLOUR.return_value()==true){
      colourPointer ++;
      if (colourPointer == 3){
        colourPointer = 0;
      }
    }
    CHANGE_COLOUR.return_position();    
  }
}

void keyPressed(){
  V_INPUT.keyboard_input();
  LAMBDA_INPUT.keyboard_input();
}