コード例 #1
0
ファイル: Entity.cpp プロジェクト: thomastrapp/buggy-bawkses
void Entity::sync_visible(const b2Body * source, sf::Transformable& target)
{
  if( source == NULL )
  {
    BOOST_THROW_EXCEPTION(Game::Exception());
  }
  
  // sync position
  {
    b2Vec2 b2_position = source->GetPosition();
    
    sf::Vector2f sf_position(
      Game::Util::meter_to_pixel(b2_position.x),
      Game::Util::meter_to_pixel(b2_position.y)
    );
    
    target.setPosition(sf_position);
  }
  
  // sync angle
  {
    target.setRotation(
      Game::Util::rad_to_deg(source->GetAngle())
    );
  }
}
コード例 #2
0
ファイル: Integrator.cpp プロジェクト: iPruch/X-GS
    // Simple integrator. Accumulates error as time passes.
    void Integrator::Euler(PhysicState& physics,
						   sf::Transformable& transf,
						   const HiResDuration& dt)
    {
        float dtValue = ((float)dt.count()/ONE_SECOND.count());
        
        transf.setPosition(transf.getPosition() + physics.getVelocity() * dtValue);
        physics.setVelocity(physics.getVelocity() + (physics.getForce() / physics.getMass()) * dtValue);
    }
コード例 #3
0
ファイル: Integrator.cpp プロジェクト: iPruch/X-GS
    // More accurate than Euler, but a bit more resource-consuming.
    void Integrator::RK4(PhysicState& physics,
						 sf::Transformable& transf,
						 const HiResDuration& dt)
    {
        float dtValue = ((float)dt.count()/ONE_SECOND.count());
        
        Derivative a,b,c,d;
        Derivative initial;
        
        a = evaluateRK4(physics, transf, HiResDuration::zero(), initial);
        b = evaluateRK4(physics, transf, dt / 2, a);
        c = evaluateRK4(physics, transf, dt / 2, b);
        d = evaluateRK4(physics, transf, dt, c);
        
        sf::Vector2f dpdt = 1.0f / 6.0f *
        ( a.dp + 2.0f * (b.dp + c.dp) + d.dp );
        
        sf::Vector2f dvdt = 1.0f / 6.0f *
        ( a.dv + 2.0f * (b.dv + c.dv) + d.dv );
        
        transf.setPosition(transf.getPosition() + dpdt * dtValue);
        physics.setVelocity(physics.getVelocity() + dvdt * dtValue);
    }