// Interface for the Vehicle class
// CSE143 Spring '01
// Homework 6

#ifndef _VEHICLE_H
#define _VEHICLE_H

#include "sim_object.h"
#include "position.h"

// Vehicle: models a vehicle that can travel the roads in the simulation.
// Each vehicle keeps track of the vehicle directly ahead of it on the same
// road segment (the member "ahead"), and makes sure not to run into it.
// This creates a linked list of vehicles in each segment.
// This is a subclass of SimObject and implements draw() and tick().

class Vehicle : public SimObject {
public:
	// Construct a vehicle with uninitialized position and heading.
	Vehicle();

	// Construct a vehicle with same position and heading as <other>õ
	Vehicle(const Vehicle& other);

	// Set position and heading of this vehicle to <other>'s
	Vehicle& operator =(const Vehicle& other);

	// Destructor (empty - no dynamic memory in this class)
	virtual ~Vehicle();

	// Draw the vehicle on the screen
	virtual void draw(GP142Display& gp);

	// Update vehicle appearance.
	virtual void tick();

	// Advance the specified distance in pixels, in the current direction.
	virtual void advance(int distance);

	// Turn the vehicle to face the new direction.
	virtual void turn(Direction newHeading);

	// Move the vehicle to the specified position.
	virtual void setPosition(Position pos);

	// Returns the current position.
	virtual Position getPosition() const;

	// Returns the current heading.
	virtual Direction getHeading() const;

private:
	Position pos;		// Current screen position
	Direction heading;	// Current driving direction
};

#endif