APCS: AP Computer Science A @sfhs

Tetris resources

The basic falling item, with a Key Listener:

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
 
public class Tetris extends JPanel implements KeyListener, ActionListener
{
	public static int WIDTH=800;
	public static int HEIGHT=600;
	private Font titleFont, regularFont;
	private int x,y;
	private Timer timer1, timer2;
 
 
	public Tetris() 
	{
 
		//initialize variables here...
		titleFont = new Font("Roman", Font.BOLD, 18);
		regularFont = new Font("Helvetica", Font.PLAIN, 12);
		y=0;
		x=200;
		timer1 = new Timer(50, this); //1000=1 seconds
		timer2 = new Timer(2000, this); //1000=1 seconds
		timer1.start();
 
	}
	public static void main(String[] args) {
		Tetris app= new Tetris();
		JFrame window = new JFrame("Timer Example");
		window.setSize(WIDTH, HEIGHT);
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		window.getContentPane().add(app);
		window.addKeyListener(app);
		//window.pack();
		window.setVisible(true);
 
	}
	public void paintComponent(Graphics g){
		super.paintComponent(g);
		g.setColor(Color.WHITE);
		g.fillRect(0, 0, getWidth(),getHeight());
		g.setColor(Color.BLUE);
		g.setFont(titleFont);
		g.drawString("Tetris Example", 20, 20);
		g.setColor(Color.BLACK);
		g.setFont(regularFont);
		g.drawString("y = "+y, 20, 40);
		g.fillRect(x, y, 10, 10);
 
	}
 
 
	// These 3 methods need to be declares to implement the KeyListener Interface
	@Override
	public void keyTyped(KeyEvent e) {}
 
	@Override
	public void keyPressed(KeyEvent e) {
		int code=e.getKeyCode();
 
	      if (code ==39) // right
	    	  x=(x+1)%HEIGHT;
	      else if (code == 37 && x>0) //left
	    	  x--;
	      repaint();
	}
 
	@Override
	public void keyReleased(KeyEvent e) {}
	@Override
	public void actionPerformed(ActionEvent e) {
 
	     if (e.getSource()==timer1){
	    	 y=(y+1)%WIDTH;
	     }
	     repaint();
	}
 
}

You may wish to make a Shape class which has an ArrayList<Rectangle> which will have a draw method, an.

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.ArrayList;
public class Shape
{
     private int x,y, size;
     private ArrayList<Rectangle> boxes;
     private Color color;
     Shape(int x, int y, int[] xPoints, int[] yPoints)
     {
    	 this.x=x;
    	 this.y=y;
    	 int n = xPoints.length;
    	 color = Color.RED;
    	 boxes = new ArrayList<Rectangle>();
     }
     public void draw(Graphics g)
     {
    	
    	 for (Rectangle r:boxes) {
    		 g.setColor(color);
    		 g.fillRect(r.x, r.y, r.width, r.height);
    		 g.setColor(Color.BLACK);
    		 g.drawRect(r.x, r.y, r.width, r.height);
    		 
    	 }
    		 
    	 
     }
}