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;
    }
  }
}