import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; imp

ID: 3834575 • Letter: I

Question

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;

import javax.swing.JComponent;

import javafx.scene.layout.Pane;
import javafx.scene.shape.Circle;

public class MovePlayer extends JComponent implements KeyListener {
   private Rectangle rect;
   private Graphics g;
   public MovePlayer(){
       addKeyListener(this);

       setFocusable(true);
       setFocusTraversalKeysEnabled(false);

   }
   public void paintComponent(Graphics g){
       this.g= g;
       Graphics2D g2 = (Graphics2D)g;
       keysDown = new ArrayList<>();
       rect = new Rectangle(32,32,25,25);
       g2.draw(rect);
       g2.setColor(Color.black);
       g2.fill(rect);
   }

   public void dropBomb(Graphics g){
       g.drawOval((int)rect.getCenterX(), (int)rect.getCenterY(), 10, 10);
       g.setColor(Color.RED);
   }

   @Override
   public void keyPressed(KeyEvent e) {
       System.out.println("I am in");
       if(!keysDown.contains(e.getKeyCode())){
           keysDown.add(new Integer(e.getKeyCode()));
       }
       moveRect();
       repaint();
   }
   @Override
   public void keyReleased(KeyEvent e) {
       keysDown.remove(new Integer(e.getKeyCode()));
   }

   public void moveRect(){

       int x = rect.x;
       int y = rect.y;
       if(keysDown.contains(KeyEvent.VK_UP)){
           y -=2;
       }
       if(keysDown.contains(KeyEvent.VK_DOWN)){
           y +=2;
       }if(keysDown.contains(KeyEvent.VK_LEFT)){
           x -=2;
       }if(keysDown.contains(KeyEvent.VK_RIGHT)){
           x +=2;
       }if(keysDown.contains(KeyEvent.VK_D)){
           System.out.println("D button was pressed");
       }if(keysDown.contains(KeyEvent.VK_S)){
           System.out.println("S button was pressed");

       }
       rect.setLocation(x, y);
       repaint();
   }

   @Override
   public void keyTyped(KeyEvent e) {
   }
}

public class Main {

public static void main(String[] args) {

JFrame frame = new JFrame("Window");

frame.setSize(new Dimension(800, 800));

frame.setLocationRelativeTo(null);

SwingUtilities.updateComponentTreeUI(frame);

frame.invalidate();

frame.validate();

frame.repaint();

MovePlayer mp = new MovePlayer();

frame.add(mp);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

drawPanel class

import java.awt.Graphics;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.io.File;

import java.util.ArrayList;

import javax.swing.JPanel;

public class DrawPanel extends JPanel {

private TileLayer layer;

private ArrayList<String> level;

public DrawPanel(){

level = new ArrayList<>();

for(int i = 0;i<2;i++){

level.add("level"+(i+1)+".txt");

}

layer = TileLayer.FromFile(level.get(0));

}

@Override

public void paintComponent(Graphics g){

super.paintComponent(g);

layer.drawLayer(g);

}

THE QUESTION IS, WHEN THE FRAME GUI COMES OUT FIRST, IT PRINTS THE RECTANGLE BUT IT DOESN'T MOVE IT AS WE PLAY AROUND WITH THE ARROW KEYS. HOWEVER, IT PRINTS SOMETHING NEW AS WE PRESS AN ARROW KEY.

Explanation / Answer

Please try with the following code it will work

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class MovingRectangle {

public static void main(String[] args) {
new MovingRectangle();
}

public MovingRectangle() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}

JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridLayout(0, 6));
frame.add(new TestPane(Color.RED));
frame.add(new TestPane(Color.GREEN));
frame.add(new TestPane(Color.BLUE));
frame.add(new TestPane(Color.ORANGE));
frame.add(new TestPane(Color.PINK));
frame.add(new TestPane(Color.MAGENTA));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}

public class TestPane extends JPanel {

private int yPos;
private int size = 25 + (int)Math.round(Math.random() * 50);
private int yDelta = 5 + (int)Math.round(Math.random() * 10);

public TestPane(Color foreground) {
setForeground(foreground);
Timer timer = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
yPos += yDelta;
if (yPos < 0) {
yPos = 0;
yDelta *= -1;
System.out.println(yDelta);
} else if (yPos + size > getHeight()) {
yPos = getHeight() - size;
yDelta *= -1;
}
repaint();
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
}

@Override
public Dimension getPreferredSize() {
return new Dimension(50, 200);
}

@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(getForeground());
g2d.drawRect(0, yPos, getWidth() - 1, size);
g2d.dispose();
}
}

}

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import java.awt.Color; import java.awt.Cursor; import java.awt.Font; import java

import java.awt.Color; import java.awt.Graphics; import javax.swing.JApplet; pub

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import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; imp

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