jas.space
Class Turtle

java.lang.Object
  jas.space.AbstractTurtle
      jas.space.Turtle

All Implemented Interfaces:

IColored, IGridPosition

public class Turtle
extends AbstractTurtle

An agent able to move itself upon an object grid. It has got some specific instruction for movement. Each turtle has an heading expressed in degrees. It can make steps, turn right or left, measure the distance from another position on the grid. Each turtle has a color and it is able to draw itself on a grid drawing layer.

Title: JAS

Description: Java Agent-based Simulation library

Copyright (C) 2002 Michele Sonnessa

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

Author:

Michele Sonnessa

Field Summary

Fields inherited from class jas.space.AbstractTurtle

DEFALUT_COLOR, DIR_EAST, DIR_NORTH, DIR_NORTH_EAST, DIR_NORTH_WEST, DIR_SOUTH, DIR_SOUTH_EAST, DIR_SOUTH_WEST, DIR_WEST, MOVE_BOUND, MOVE_REFLECT, MOVE_TORUS

Constructor Summary

Turtle(int id, IObjGrid grid)
Create a turtle with a given identifier on the given grid at position (0,0).

Turtle(int id, IObjGrid grid, int x, int y)
Create a turtle with a given identifier on the given grid at the given position.

Turtle(int id, IObjGrid grid, int x, int y, java.awt.Color color)
Create a turtle with a given identifier on the given grid at the given position.

Method Summary

void	forward(int steps) Make some steps forward, according the current heading.
int	getHeading() Return the current heading of the turtle.
int	getNextX(int steps) Return the new x coordinate walking the current heading direction for given steps.
int	getNextY(int steps) Return the new y coordinate walking the current heading direction for given steps.
boolean	leap(int steps) Make some steps forward, but moves only if the target position is empty.
void	setCardinalHeading(int directionType) Set the turtle's heading using a constant for cardinal points.
void	setHeading(int heading) Set the current heading.
void	setRandomHeading() Randomize the turtle's heading.
void	setXY(int x, int y) Set a new position.
void	turnCardinalLeft(int steps)
void	turnCardinalRight(int steps)
void	turnLeft(int degrees) Change the current heading rotating it to the left.
void	turnRight(int degrees) Change the current heading rotating it to the right.

Methods inherited from class jas.space.AbstractTurtle

forward, getColor, getDistanceFrom, getID, getMovingType, getNextX, getNextY, getWorldHeight, getWorldWidth, getX, getY, leap, setColor, setIfEmptyXY, setMovingType, setX, setY

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Turtle

public Turtle(int id,
              IObjGrid grid)

Create a turtle with a given identifier on the given grid at position (0,0).

Parameters:

id - The identifier for turtle.

grid - The grid upon the turtle moves.

Turtle

public Turtle(int id,
              IObjGrid grid,
              int x,
              int y)

Create a turtle with a given identifier on the given grid at the given position.

Parameters:

id - The identifier for turtle.

x - The initial x coordinate of the turtle.

y - The initial y coordinate of the turtle.

grid - The grid upon the turtle moves.

Turtle

public Turtle(int id,
              IObjGrid grid,
              int x,
              int y,
              java.awt.Color color)

Create a turtle with a given identifier on the given grid at the given position. Set its color to the given color.

Parameters:

id - The identifier for turtle.

x - The initial x coordinate of the turtle.

y - The initial y coordinate of the turtle.

color - The initial color of the turtle.

grid - The grid upon the turtle moves.

Method Detail

forward

public void forward(int steps)

Make some steps forward, according the current heading.

Specified by:

forward in class AbstractTurtle

Parameters:

steps - The number of steps the turtle has to make.

getHeading

public int getHeading()

Description copied from class: AbstractTurtle

Return the current heading of the turtle.

Specified by:

getHeading in class AbstractTurtle

Returns:

The current heading.

getNextX

public int getNextX(int steps)

Return the new x coordinate walking the current heading direction for given steps. It uses the grid bound checking methods according to the turtle's current moving type.

Specified by:

getNextX in class AbstractTurtle

Parameters:

steps - The number of steps to move forward.

Returns:

The candidate x coordinate.

getNextY

public int getNextY(int steps)

Return the new y coordinate walking the current heading direction for given steps. It uses the grid bound checking methods according to the turtle's current moving type.

Specified by:

getNextY in class AbstractTurtle

Parameters:

steps - The number of steps to move forward.

Returns:

The candidate y coordinate.

leap

public boolean leap(int steps)

Make some steps forward, but moves only if the target position is empty.

Specified by:

leap in class AbstractTurtle

Parameters:

steps - The number of steps the turtle has to make.

Returns:

True only if the turtle has moved.

setCardinalHeading

public void setCardinalHeading(int directionType)

Set the turtle's heading using a constant for cardinal points.

Specified by:

setCardinalHeading in class AbstractTurtle

Parameters:

directionType - One of DIR_NORTH, DIR_NORTH_EAST, ... constant.

setHeading

public void setHeading(int heading)

Set the current heading.

Specified by:

setHeading in class AbstractTurtle

Parameters:

heading - The new heading.

setRandomHeading

public void setRandomHeading()

Randomize the turtle's heading. It gets a random number from 0 to 359 degrees. The random generator is synchronized with JAS randomizer.

Specified by:

setRandomHeading in class AbstractTurtle

setXY

public void setXY(int x,
                  int y)

Set a new position.

Overrides:

setXY in class AbstractTurtle

Parameters:

x - The new x coordinate.

y - The new y coordinate.

turnCardinalLeft

public void turnCardinalLeft(int steps)

Specified by:

turnCardinalLeft in class AbstractTurtle

turnCardinalRight

public void turnCardinalRight(int steps)

Specified by:

turnCardinalRight in class AbstractTurtle

turnLeft

public void turnLeft(int degrees)

Change the current heading rotating it to the left.

Specified by:

turnLeft in class AbstractTurtle

Parameters:

degrees - The number of degrees to rotate the heading.

turnRight

public void turnRight(int degrees)

Change the current heading rotating it to the right.

Specified by:

turnRight in class AbstractTurtle

Parameters:

degrees - The number of degrees to rotate the heading.