Wie bekomme ich meinen Key-Listener, um ein Rechteck zu erstellen?

Question

Das ist mein Code. Ich möchte, dass der Schlüssel-Listener ein Rechteck erstellt, wenn ich eine Taste drücke. Ich habe Probleme, die Füllrechteckmethode in den Schlüsselhörer zu implementieren.

Ich habe versucht, den Schlüssel Listener zu trennen, aber dann weiß ich nicht, wie Sie sie miteinander verbinden, um die JPanel-Methoden zu verwenden.

import javax.swing.*; 
import java.awt.*; 

public class Keyboard 
{ 
    public static void main(String[] args) 
    { 
     JFrame frame = new JFrame("Keyboard"); 
     frame.setLayout(new BorderLayout()); 
     MyPanel displayPanel = new MyPanel(); 
     frame.add(displayPanel, BorderLayout.CENTER); 

     frame.addKeyListener(displayPanel); 

     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setSize(java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width, java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height); 
     frame.setVisible(true); 
    } 
} 

MyPanel Klasse

import java.awt.event.*; 
import javax.swing.*; 
import java.awt.*; 
import javax.swing.JComponent; 

import javax.swing.JPanel; 

public class MyPanel extends JPanel implements KeyListener { 
    private boolean one; 
    private boolean two; 
    private boolean three; 
    private boolean four; 
    private boolean five; 
    private boolean six; 
    private boolean seven; 
    private boolean eight; 
    private boolean nine; 
    private boolean zero; 
    private boolean dash; 

    public MyPanel() { 
     one = false; 
     two = false; 
     three = false; 
     four = false; 
     five = false; 
     six = false; 
     seven = false; 
     eight = false; 
     nine = false; 
     zero = false; 
     dash = false; 

    } 
    public void paintComponent(Graphics g) 
    { 
     super.paintComponent(g); 
     setBackground(new Color(51, 25, 0)); 

     for(int i=0; i<11; i++) 
     { 
      if(i%2 == 0) 
      { 
       g.setColor(Color.WHITE); 
       g.fillRect(i*(java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width/11), 450, 212, 1000); 
      } 
      else 
      { 
       g.setColor(Color.BLACK); 
       g.fillRect(i*(java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width/11), 450, 174, 1000); 
      } 
      if(one==true) 
      { 
       g.setColor(Color.BLUE); 
       g.fillRect(50,50,50,50); 
       repaint(); 
      } 
     } 
    } 
    public void keyPressed(KeyEvent e) 
    { 
     if(e.getKeyCode() ==KeyEvent.VK_1 && !one) 
     { 
      System.out.println("asdasda"); 
      one = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_2 && !two) 
     { 
      two = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_3 && !three) 
     { 
      three = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_4 && !four) 
     { 
      four = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_5 && !five) 
     { 
      five = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_6 && !six) 
     { 
      six = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_7 && !seven) 
     { 
      seven = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_8 && !eight) 
     { 
      eight = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_9 && !nine) 
     { 
      nine = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_0 && !zero) 
     { 
      zero = true; 
     } 
     else if(e.getKeyCode() == 189 && !dash) 
     { 
      dash = true; 
     } 
    } 
    public void keyReleased(KeyEvent e) 
    { 
     if(e.getKeyCode() ==KeyEvent.VK_1) 
     { 
      one = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_2) 
     { 
      two = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_3) 
     { 
      three = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_4) 
     { 
      four = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_5) 
     { 
      five = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_6) 
     { 
      six = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_7) 
     { 
      seven = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_8) 
     { 
      eight = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_9) 
     { 
      nine = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_0) 
     { 
      zero = false; 
     } 
     else if(e.getKeyCode() == 189) 
     { 
      dash = false; 
     } 
    } 
    public void keyTyped(KeyEvent e) 
    { 
     System.out.println("Typed: " + e.getKeyChar()); 
    } 
} 

Answer 1

hatte ich ein ähnliches Problem vor einer Weile, ich es fest durch eine kleine Rechteck-Klasse wie diese

package notDeafult; 

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Rectangle; 

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 
/** 
* 
* 
*/ 
public class rectangle { 
//The basic outline of a rectangle making up the grid 

    Rectangle rect; 
    int width; 
    int height; 

    public rectangle() { 
    } 

    public rectangle(int x, int y) { 

     this.width = 80; //Setting the size 
     this.height = 80; 
     this.rect = new Rectangle(x + 80, y + 30, width, height);//Moving the object to the centre 
    } 

    public void draw(Graphics g) { 
     g.setColor(Color.green); 
     //.drawRect only draws the outline 
     g.drawRect(rect.x, rect.y, width, height); 

    } 

} 

dann erstellen, wenn Sie bereit sind, einfach Rufen Sie eine Lackiermethode unter einem neuen Jpanel, wie folgt an:

jPanel3 = new javax.swing.JPanel(){ 
    public void paintComponent(Graphics g) { 
       super.paintComponent(g); 
       rectangle rect = new rectangle(width, height); 
       rect.draw(g) 



} 

Und dann könnte man einfach dem paintcomponent seine eigene Methode Namen geben wie paintRectangles oder etwas

und es hier nennen, wenn Sie Ihren Tastendruck

else if(e.getKeyCode() ==KeyEvent.VK_5){ 
      paintRectangles(); 
} 

so etwas bekommen soll funktionieren, denke ich.

Answer 2

Ich habe in Ihrer Klasse einige Änderungen:

• nicht alle Booleschen Variablen auf false init benötigt wird, sind diejenigen, seine Werte noch
• erstellt eine paintRectangle Methode
• Eclipse-Code-Formatierung (ich glaube, ist klar)

---

public class MyPanel extends JPanel implements KeyListener { 

    private boolean one, two, three, four, five, six, seven, eight, nine, zero, dash; 

    public MyPanel() { 
    } 

    public void paintComponent(Graphics g) { 
     super.paintComponent(g); 
     setBackground(new Color(51, 25, 0)); 

     for (int i = 0; i < 11; i++) { 
      if (i % 2 == 0) { 
       g.setColor(Color.WHITE); 
       g.fillRect(
         i * (java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width 
           /11), 
         450, 212, 1000); 
      } else { 
       g.setColor(Color.BLACK); 
       g.fillRect(
         i * (java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width 
           /11), 
         450, 174, 1000); 
      } 

     } 

     paintRectangle(g); 
    } 

    private void paintRectangle(Graphics g) { 
     if (one) { 
      g.setColor(Color.BLUE); 
      g.fillRect(50, 50, 50, 50); 
     } else if (two) { 
      g.setColor(Color.CYAN); 
      g.fillRect(50, 50, 50, 50); 
     } 
    } 

    public void keyPressed(KeyEvent e) { 
     if (e.getKeyCode() == KeyEvent.VK_1 && !one) { 
      System.out.println("asdasda"); 
      one = true; 
      repaint(); 
     } else if (e.getKeyCode() == KeyEvent.VK_2 && !two) { 
      two = true; 
      repaint(); 
     } else if (e.getKeyCode() == KeyEvent.VK_3 && !three) { 
      three = true; 
     } else if (e.getKeyCode() == KeyEvent.VK_4 && !four) { 
      four = true; 
     } else if (e.getKeyCode() == KeyEvent.VK_5 && !five) { 
      five = true; 
     } else if (e.getKeyCode() == KeyEvent.VK_6 && !six) { 
      six = true; 
     } else if (e.getKeyCode() == KeyEvent.VK_7 && !seven) { 
      seven = true; 
     } else if (e.getKeyCode() == KeyEvent.VK_8 && !eight) { 
      eight = true; 
     } else if (e.getKeyCode() == KeyEvent.VK_9 && !nine) { 
      nine = true; 
     } else if (e.getKeyCode() == KeyEvent.VK_0 && !zero) { 
      zero = true; 
     } else if (e.getKeyCode() == 189 && !dash) { 
      dash = true; 
     } 
    } 

    public void keyReleased(KeyEvent e) { 
     if (e.getKeyCode() == KeyEvent.VK_1) { 
      one = false; 
     } else if (e.getKeyCode() == KeyEvent.VK_2) { 
      two = false; 
     } else if (e.getKeyCode() == KeyEvent.VK_3) { 
      three = false; 
     } else if (e.getKeyCode() == KeyEvent.VK_4) { 
      four = false; 
     } else if (e.getKeyCode() == KeyEvent.VK_5) { 
      five = false; 
     } else if (e.getKeyCode() == KeyEvent.VK_6) { 
      six = false; 
     } else if (e.getKeyCode() == KeyEvent.VK_7) { 
      seven = false; 
     } else if (e.getKeyCode() == KeyEvent.VK_8) { 
      eight = false; 
     } else if (e.getKeyCode() == KeyEvent.VK_9) { 
      nine = false; 
     } else if (e.getKeyCode() == KeyEvent.VK_0) { 
      zero = false; 
     } else if (e.getKeyCode() == 189) { 
      dash = false; 
     } 
    } 

    public void keyTyped(KeyEvent e) { 
     System.out.println("Typed: " + e.getKeyChar()); 
    } 
} 

Answer 3

Ich habe das Problem herausgefunden. Hier ist der Code für Ihr Problem.

import javax.swing.*; 
import java.awt.*; 

    public class Keyboard 
    { 
     public static void main(String[] args) 
     { 
      JFrame frame = new JFrame("Keyboard"); 
      frame.setLayout(new BorderLayout()); 
      MyPanel displayPanel = new MyPanel(); 
      frame.add(displayPanel, BorderLayout.CENTER); 

      frame.addKeyListener(displayPanel); 

      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
      frame.setSize(java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width, java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height); 
      frame.setVisible(true); 
     } 
    } 

Hier ist MyPanel Klasse

import java.awt.event.*; 
import javax.swing.*; 
import java.awt.*; 
import java.awt.image.ImageObserver; 
import java.text.AttributedCharacterIterator; 
import javax.swing.JComponent; 

import javax.swing.JPanel; 

public class MyPanel extends JPanel implements KeyListener { 
    private boolean one; 
    private boolean two; 
    private boolean three; 
    private boolean four; 
    private boolean five; 
    private boolean six; 
    private boolean seven; 
    private boolean eight; 
    private boolean nine; 
    private boolean zero; 
    private boolean dash; 
    Graphics g; 

    public MyPanel() { 
     one = false; 
     two = false; 
     three = false; 
     four = false; 
     five = false; 
     six = false; 
     seven = false; 
     eight = false; 
     nine = false; 
     zero = false; 
     dash = false; 

    } 
    @Override 
    public void paintComponent(Graphics g) 
    { 
     super.paintComponent(g); 
     setBackground(new Color(51, 25, 0)); 

     for(int i=0; i<11; i++) 
     { 
      if(i%2 == 0) 
      { 
       g.setColor(Color.WHITE); 
       g.fillRect(i*(java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width/11), 450, 212, 1000); 

      } 
      else 
      { 
       g.setColor(Color.BLACK); 
       g.fillRect(i*(java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width/11), 450, 174, 1000); 
      } 
      if(one==true) 
      { 

       g.setColor(Color.BLUE); 
       g.drawRect(50, 50, 50, 50); 
       g.fillRect(50,50,50,50); 
       repaint(); 

      } 

     } 
    } 
    @Override 
    public void keyPressed(KeyEvent e) 
    { 
     if(e.getKeyCode() ==KeyEvent.VK_1) 
     { 

       one = true; 
       repaint(); 
      System.out.println("asdasda"); 


     } 
     else if(e.getKeyCode() ==KeyEvent.VK_2 && !two) 
     { 
      two = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_3 && !three) 
     { 
      three = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_4 && !four) 
     { 
      four = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_5 && !five) 
     { 
      five = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_6 && !six) 
     { 
      six = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_7 && !seven) 
     { 
      seven = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_8 && !eight) 
     { 
      eight = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_9 && !nine) 
     { 
      nine = true; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_0 && !zero) 
     { 
      zero = true; 
     } 
     else if(e.getKeyCode() == 189 && !dash) 
     { 
      dash = true; 
     } 
    } 
    public void keyReleased(KeyEvent e) 
    { 
     if(e.getKeyCode() ==KeyEvent.VK_1) 
     { 
      one = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_2) 
     { 
      two = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_3) 
     { 
      three = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_4) 
     { 
      four = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_5) 
     { 
      five = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_6) 
     { 
      six = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_7) 
     { 
      seven = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_8) 
     { 
      eight = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_9) 
     { 
      nine = false; 
     } 
     else if(e.getKeyCode() ==KeyEvent.VK_0) 
     { 
      zero = false; 
     } 
     else if(e.getKeyCode() == 189) 
     { 
      dash = false; 
     } 
    } 
    public void keyTyped(KeyEvent e) 
    { 
     System.out.println("Typed: " + e.getKeyChar()); 
    } 
} 

Der Grund Code nicht funktioniert ist, dass Sie nicht repaint() Verfahren nach der Einstellung hat Aufruf ein = true;. Jetzt funktioniert dein Code. Überprüfen Sie und lassen Sie mich wissen, wenn es irgendeine Verwirrung gibt.

Hinweis: Dies funktioniert nur für Taste 1. Jetzt für andere Tasten ähnlich.