Hi,
I have to make a snake game. i need an array to store allposition of the snakes body. i will also need a variable to store the number of parts in the snakes body. I know that i have to use the number of parts ++ but i dont know where i have to put this, nor where to declare it.
Im pretty sure it should be in SnakeClass but not sure how to pass a parameter from SnakeClass to SnakeJPanel Class.
I first triedto write a method in SnakeClass but i could not pass the parameter to Jpanel class , (Somehow i was getting a compile error).
Below is my work i have done so far, so please help.
**
* @author insert your name here
* @version S2, 2006
*/
import java.awt.*;
public class Snake {
private static final int MAX_BODY_PARTS = 1000;
private int direction;
private int left, top;
private Rectangle[] rects ;
private int numberOfParts;
public Snake () {
left = SnakeConstants.SNAKE_START_X;
top = SnakeConstants.SNAKE_START_Y;
direction = SnakeConstants.SNAKE_RIGHT;
rects = new Rectangle[1000];
rects[0] = new Rectangle( SnakeConstants.SNAKE_START_RECT );
numberOfParts = 1;
}
public void add(){
numberOfParts++;
}
public void drawSnake( Graphics g ) {
g.setColor( Color.RED );
g.fillRect( left, top, SnakeConstants.SIZE, SnakeConstants.SIZE );
Rectangle r;
for (int i=0; i<numberOfParts; i++ ) {
r = rects[i];
g.setColor( Color. GREEN);
g.fillRect( r.x, r.y, r.width, r.height );
}
}
public void move() {
int previousX = left;
int previousY = top;
int leftSnake = rects[numberOfParts-1].x;
int topSnake = rects[numberOfParts-1].y;
if ( direction == SnakeConstants.SNAKE_UP ) {
top = top - SnakeConstants.SIZE;
} else if ( direction == SnakeConstants.SNAKE_DOWN ) {
top = top + SnakeConstants.SIZE;
} else if ( direction == SnakeConstants.SNAKE_RIGHT ) {
left = left + SnakeConstants.SIZE;
} else if ( direction == SnakeConstants.SNAKE_LEFT ) {
left = left - SnakeConstants.SIZE;
}
rects[numberOfParts] = new Rectangle( leftSnake, topSnake, SnakeConstants.SIZE, SnakeConstants.SIZE );
if ( intersectsBoundary() ) {
left = previousX;
top = previousY;
}
}
public void setDirection( int dir ) {
direction = dir;
}
public boolean intersectsBoundary() {
Rectangle snakeR = new Rectangle( left, top, SnakeConstants.SIZE, SnakeConstants.SIZE );
return snakeR.intersects( SnakeConstants.NORTH_BOUNDARY )|| snakeR.intersects( SnakeConstants.SOUTH_BOUNDARY )|| snakeR.intersects( SnakeConstants.WEST_BOUNDARY )|| snakeR.intersects( SnakeConstants.EAST_BOUNDARY ) ;
}
}/**
*
* @author Adriana Ferraro
* @version S2, 2006
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class SnakeJPanel extends JPanel implements ActionListener, MouseListener, KeyListener {
private Timer t;
private Snake snake;
private YumYum yumyum;
public SnakeJPanel() {
t = new Timer( 200, this );
snake = new Snake();
yumyum = new YumYum();
addKeyListener( this );
addMouseListener( this );
}
//-------------------------------------------------------------------
//-------- Move the Snake object and, after the move, ---------------
//-------- check that it has not collided with the -----------------
//-------- NoNos. Also check if the snake --------------------------
//-------- has eaten the YumYum object ------------------------------
//-------------------------------------------------------------------
public void actionPerformed( ActionEvent e ) {
snake.move();
repaint();
}
//-------------------------------------------------------------------
//-------- Draw all the Snake game objects. -------------------------
//-------------------------------------------------------------------
public void paintComponent( Graphics g ) {
super.paintComponent( g );
Rectangle gameArea = SnakeConstants.GAME_AREA;
g.setColor(Color.WHITE);
g.fillRect( gameArea.x, gameArea.y, gameArea.width, gameArea.height );
drawGrid(g);
snake.drawSnake(g);
yumyum.drawYum(g);
}
//-------------------------------------------------------------------
//-------- Draw a grid which helps to check that --------------------
//-------- the snake game objects are lined up. --------------------
//-------------------------------------------------------------------
private void drawGrid(Graphics g ) {
int jump = SnakeConstants.SIZE;
int x = SnakeConstants.TOP_LEFT.x;
int y = SnakeConstants.TOP_LEFT.y;
int endX = SnakeConstants.TOP_RIGHT.x;
int endY = SnakeConstants.TOP_RIGHT.y + SnakeConstants.HEIGHT;
for( ; x<=endX; ) {
g.setColor(Color.LIGHT_GRAY);
g.drawLine( x, y, x, endY );
if ( x == 0 || x==endX ) {
g.setColor(Color.BLACK);
g.drawLine( x, y, x, endY );
}
x = x + jump;
}
x = SnakeConstants.TOP_LEFT.x;
for( ; y<=endY; ) {
g.setColor(Color.LIGHT_GRAY);
g.drawLine( x, y, endX, y );
if ( y == 0 || y==endY ) {
g.setColor(Color.BLACK);
g.drawLine( x, y, endX, y );
}
y = y + jump;
}
}
//-------------------------------------------------------------------
//-------- When a key is pressed the snake starts. ------------------
//-------- The arrow keys change the direction of the ---------------
//-------- Snake object. --------------------------------------------
//-------------------------------------------------------------------
public void keyPressed( KeyEvent e ) {
t.start();
int code = e.getKeyCode();
if ( code == KeyEvent.VK_UP ) {
snake.setDirection( SnakeConstants.SNAKE_UP );
} else if ( code == KeyEvent.VK_DOWN ) {
snake.setDirection( SnakeConstants.SNAKE_DOWN );
} else if ( code == KeyEvent.VK_LEFT) {
snake.setDirection( SnakeConstants.SNAKE_LEFT );
} else if ( code == KeyEvent.VK_RIGHT ) {
snake.setDirection( SnakeConstants.SNAKE_RIGHT );
}
}
public void keyReleased( KeyEvent newEvent ) { }
public void keyTyped( KeyEvent newEvent ) { }
public void mousePressed( MouseEvent newEvent ) {
requestFocusInWindow();
}
public void mouseReleased( MouseEvent newEvent ) { }
public void mouseClicked( MouseEvent newEvent ) { }
public void mouseEntered( MouseEvent newEvent ) { }
public void mouseExited( MouseEvent newEvent ) { }
}
/*
*/