class Camera
{
  float camX, camY, camZ;
  float x, y, z;
  float radius;
  float theta, phi;

  Camera(float r)
  {
    radius = r;
    phi = 90;
    theta = 135;
    x = 0;
    y = 0;
    z = 0;

  }

  void Update(float deltaX, float deltaY)
  {
    phi += deltaX;
    theta += deltaY;
    theta = constrain(theta, 1, 179);
    
    x = radius * cos(radians(phi)) * sin(radians(theta));
    y = radius * cos(radians(theta));
    z = radius * sin(radians(theta)) * sin(radians(phi));
    
    camX = x;
    camY = y;
    camZ = z;
    
    camera(camX, camY, camZ,
           0, 0, 0,
           0, 1, 0);
  }

  void Zoom(float f)
  {
    radius = constrain(radius + f, 10, 200);
  }
}