Callback-Example/Ball.h

#ifndef BALL_H
#define BALL_H

#include "GraphicsObject.h"
//#include "PhysicsObject.h"

class Ball : public GraphicsObject
{
public:
	Ball() : GraphicsObject(&Ball::SetX, this) // pointer to self (specific instance)
		{
			instance_num = ++instance_counter;
			// NOTE(dev): don't go above 100, please, for the sake of the example.
		}
	int GetXFromPhysicsSimulation()
		{
			// NOTE(dev): move around by 100 to show that the number is different each time,
			//             but keep the instance number to show you're on the same one.
			// NOTE(dev): THIS IS THE CODE that proves that the graphics object does not
			//             call on the physics system to determind its location.
			return instance_num + ((rand() % 10) * 100);
		}
	static void SetX(int &x, void *instance)
		{
			Ball *ball = static_cast<Ball*>(instance);
			// NOTE(dev): This could easily be physics_system->GetX(this->physics_lookup_id)
			//             and GraphicsObject would never have to know about it.
			x = ball->GetXFromPhysicsSimulation();
			return;
		}

private:
	static int instance_counter;
	int instance_num;
};

int Ball::instance_counter = 0;

#endif