nl.bluering.ppracing
Class Player

java.lang.Object
  |
  +--nl.bluering.ppracing.Player

public class Player

extends java.lang.Object

This class implements both the data concerning each player, as well as functions for calculating the route for the computer players.

Field Summary

static int	COM The type of the player: Computer, Human or Network-player
static int	DOWN The directions to which a player can go
static int	HUM The type of the player: Computer, Human or Network-player
static int	LEFT The directions to which a player can go
static int	NET The type of the player: Computer, Human or Network-player
static int	RIGHT The directions to which a player can go
static int	SAME The directions to which a player can go
static int	UP The directions to which a player can go

Constructor Summary

Player(java.lang.String nm, int t, Ppracing p, int startx, int starty, java.awt.Color col)
Constructs a new player

Method Summary

double	ai(int x, int y, int vx, int vy, int l) This method does a depth-first search for the longest arc-distance that can be made within the given number of moves (level).
void	ask() Is used to make the computer do a move
void	checkterrain() Checks if the car has hit the grass.
void	clicked(int x, int y) For user input from mouse
Car	getcar()
java.lang.String	getname()
boolean	isai()
boolean	isnet()
static void	main(java.lang.String[] ps) Method for testing purposes....
void	move(int m) For actually moving the car
void	moveai() This function is called by ask() to move the computer player
void	movecar(int x, int y) Internal function for moving the car to the new position.
void	settype(int i)
java.lang.String	toString()
int	type()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

LEFT

public static final int LEFT

The directions to which a player can go

RIGHT

public static final int RIGHT

The directions to which a player can go

UP

public static final int UP

The directions to which a player can go

DOWN

public static final int DOWN

The directions to which a player can go

SAME

public static final int SAME

The directions to which a player can go

COM

public static final int COM

The type of the player: Computer, Human or Network-player

HUM

public static final int HUM

The type of the player: Computer, Human or Network-player

NET

public static final int NET

The type of the player: Computer, Human or Network-player

Constructor Detail

Player

public Player(java.lang.String nm,
              int t,
              Ppracing p,
              int startx,
              int starty,
              java.awt.Color col)

Constructs a new player

Parameters:

nm - The name of the player

aip - Is the player a computer player?

p - Parental applet

startx - Horizontal start location

starty - Vertical start location

col - Color of the player

Method Detail

ask

public void ask()

Is used to make the computer do a move

isai

public boolean isai()

Returns:

True if the player is a computer player

isnet

public boolean isnet()

Returns:

True if the player is a network player

type

public int type()

Returns:

The type of this player: HUM, COM, or NET

settype

public void settype(int i)

clicked

public void clicked(int x,
                    int y)

For user input from mouse

Parameters:

x - Horizontal (circuit) location

x - Vertical (circuit) location

move

public void move(int m)

For actually moving the car

Parameters:

m - One of: LEFT, RIGHT, UP, DOWN, SAME

movecar

public void movecar(int x,
                    int y)

Internal function for moving the car to the new position.

checkterrain

public void checkterrain()

Checks if the car has hit the grass. If so, the speed is reduced to (0,0)

getname

public java.lang.String getname()

Returns:

The name of the player

getcar

public Car getcar()

Returns:

The car of the player

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

moveai

public void moveai()

This function is called by ask() to move the computer player

ai

public double ai(int x,
                 int y,
                 int vx,
                 int vy,
                 int l)

This method does a depth-first search for the longest arc-distance that can be made within the given number of moves (level). As soon as the required depth is reached, the method returns the distance of the trip. For each level, the longest trip is chosen, until the best direction is found. When all possibilities have been searched, the function returns the best move to make. To reduce the number of searches, the hit of grass will reduce the depthlevel by 2. If the car actually hits the grass, it will crash... :-) (Due to the algorithm) Probably the only way to solve this problem accurately, is by using a genetic alghorithm. Yet this routine is clean and simple :-)

Parameters:

x - Horizontal start location

y - Vertical start location

vx - Current horizontal speed

vy - Current vertical speed

l - Level of search (or number of moves to maximize)

main

public static void main(java.lang.String[] ps)

Method for testing purposes....