class MySpring{
    float M = 0.8; // Mass
    float K = 0.2; // Spring constant
    float D = 0.92; // Damping
    float Rx = 100; // Rest position
    float Ry = 100; // Rest position
    float xpos; // Position x
    float ypos; // Position y
    float vx = 0.0; // Velocity x
    float vy = 0.0; // Velocity y
    float a = 0; // Acceleration
    float f = 0; // Force
    boolean released = false;
    void move(){
      f = -K * (xpos - Rx); // f=-ky
      a = f / M; // Set the acceleration, f=ma == a=f/m
      vx = D * (vx + a); // Set the velocity
      xpos += vx; // Updated x position
      f = -K * (ypos - Ry); // f=-ky
      a = f / M; // Set the acceleration, f=ma == a=f/m
      vy = D * (vy + a); // Set the velocity
      ypos += vy; // Updated y position
      if(abs(vx)<0.01 && abs(vy) < 0.01) {
        vx = 0.0;
        vy = 0.0;
        released = false;
      }
    }
  }