package pack04;import javax.microedition.lcdui.game.Sprite;public class Tank extends Sprite {    private int speed=2;    public final static int UP=0;    public final static int RIGHT=1;    public final static int DOWN=2;    public final static int LEFT=3;    private int currentDirection=RIGHT;    GameMap map;    public Tank(GameMap map)    {        super(Utility.getImage("/Splash.png"));        this.defineReferencePixel(6, 6);        this.map=map;    }    private void changeDirection (int direction)    {        if(direction ==currentDirection)            return ;        currentDirection=direction;        switch(direction)        {            case UP:            this.setTransform(Sprite.TRANS_ROT270);            break;            case DOWN:            this.setTransform(Sprite.TRANS_ROT90);            break;            case LEFT:                this.setTransform(Sprite.TRANS_ROT180);            break;            case RIGHT:            this.setTransform(Sprite.TRANS_NONE);            break;        }    }    public boolean tryMove(int direction)    {        changeDirection(direction);        int dx=0,dy=0;        switch(direction)        {            case UP:                dy = -speed;                break;             case RIGHT:                dx = speed;                break;            case DOWN:                dy = speed;                break;           case LEFT:                dx = -speed;                break;        }        this.move(dx, dy);        if(map.isOutOfBorder(this))        {            this.move(-dx, -dy);            return false;        }        if(this.collidesWith(map, false))        {            this.move(-dx, -dy);            return false;        }        return true;    }}