Question

What would be a better parctice, writing the drawing method inside the GameObject class or in the Game class?

GameObject obj = new GameObject();
obj.Draw();

Or

GameObject obj = new GameObject();
DrawGameObject(obj);

Answer 1

It depends on what Game and GameObject are responsible for. Typically, a GameObject would contain all the information about what to draw — it’d have a model, for instance. But objects aren’t independent of each other — knowing what to draw isn’t sufficient to know how to draw it.

So a Game probably knows a lot more than a GameObject. In particular, it might know:

• whether or not a particular object should be drawn (e.g. it’s occluded based on the current camera)
• how to draw a particular object (shadows from other objects; reflections from nearby surfaces; ambient light factors; etc.)
• etc.

Of the two options presented, it probably makes more sense to put the Draw method outside the GameObject.