ich einen Ball in eine JPanel hinzufügen versuchen aber ich bin nicht sicher, wie dies zu tun Im Folgenden wird der Code Ich habe derzeit für den Ball in den JPanel hinzugefügt wird. Ich versuche, mehrere Bälle an einem zufälligen Ort auf dem Bildschirm hinzuzufügen. Der erste erscheint wie erwartet, aber mehr als das erscheint nicht auf dem Bildschirm.Wie man ein Objekt in ein JPanel hinzufügen
Kugelklasse;
public class Ball extends Component {
public static double ballX = rand.nextInt(500) + 40;
public static double ballY = rand.nextInt(300) + 10;
public static Ball[] balls = new Ball[20];
public Ball() {
}
public void draw(Graphics g2) {
Color color = new Color(r, g, b);
g2.setColor(color);
g2.fillOval((int) ballX, (int) ballY, 30, 30);
}
}
Methode, die versucht, einen Ball in den JPanel hinzuzufügen;
public class BallFrames extends JFrame {
/* creates static varibles privite for use withing class and public for
use out side of the class */
public static final JPanel controlPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
public static final JPanel ballPanel = new JPanel();
public static JButton button;
public static JPanel displayPanel = new JPanel(new BorderLayout());
private static int FRAME_WIDTH = 600;
private static int FRAME_HEIGHT = 600;
/**
* constructor called method to create the components
*/
public BallFrames() {
setSize(FRAME_WIDTH,FRAME_HEIGHT);
createComponents(); // creates all compononents
}
/*
* calls helper methods to create all of the componanats needed
*/
private void createComponents() {
ActionListener listener = new BallListener();
createPanel(); // creates a panel
createButtons(listener); // Creates a button
createSlider();
}
/**
* method to create panels
*/
public void createPanel() {
BallComponent component = new BallComponent(); // creates a new BallCompoenet
displayPanel.add(component, BorderLayout.CENTER);
displayPanel.add(controlPanel, BorderLayout.SOUTH); // adds thecontrol panel
add(displayPanel); // adds the dice to the JFrame
}
public static void addBall() throws InterruptedException {
Ball.balls[BallListener.balls] = new Ball();
System.out.println(BallListener.balls); // testing
ballPanel.add(Ball.balls[BallListener.balls]);
// ballPanel.add(ball);
Runnable r = new BallRunnable();
Thread t = new Thread(r);
t.start();
t.join();
ballPanel.repaint();
}
Wie ich sie zeichne;
public class BallComponent extends JComponent {
/**
* calls paintComponenet to render images on the screen
*
* @param g
*/
@Override
public void paintComponent(Graphics g) {
int delay = 1000;
super.paintComponent(g); // call to super
Graphics2D g2 = (Graphics2D) g; // recover the graphic
TimerListener listener = new TimerListener();
Timer t = new Timer(delay, listener);
if (BallListener.gameOn == true) {
for(int i = 0; i < BallListener.balls; i++){
Ball.balls[i].draw(g2);
}
BallFrames.displayPanel.repaint();
}
}
ActionListener for the buttons;
public class BallListener implements ActionListener {
public static boolean gameOn = false;
public static int balls = 0;
/**
* gets the which button has been pressed and responds appriately
*
* @param event based on the event it will preform selected actions
*/
@Override
public void actionPerformed(ActionEvent event) {
String action = event.getActionCommand();
switch (action) {
case "start":
gameOn = true;
{
try {
BallFrames.addBall();
} catch (InterruptedException ex) {
Logger.getLogger(BallListener.class.getName()).log(Level.SEVERE, null, ex);
}
balls++;
}
BallFrames.displayPanel.repaint();
break;
case "pause":
break;
}
}
Kugelgeführt;
public class BallRunnable implements Runnable {
private static Random rand = new Random();
public static boolean goLeft = true;
public static boolean goRight = false;
public static boolean goUp = false;
public static boolean goDown = false;
public static boolean diagonalUp = false;
public static boolean diagonalDown = false;
public static double speed = 0.2f;
public BallRunnable() {
}
public void run() {
boundsCheckY1();
boundsCheckX1();
boundsCheckY2();
boundsCheckX2();
}
public void boundsCheckX1() {
int temp;
if (Ball.ballX < 1) {
temp = rand.nextInt(5) + 1;
if(temp == 1) {
goRight = true;
goLeft = false;
goUp = false;
goDown = false;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 2) {
goRight = true;
goUp = true;
goDown = false;
goLeft = false;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 3) {
goRight = true;
goUp = false;
goDown = true;
goLeft = false;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 4) {
goRight = true;
goUp = false;
goDown = false;
goLeft = false;
diagonalUp = true;
diagonalDown = false;
} else if (temp == 5) {
goRight = true;
goUp = false;
goDown = false;
goLeft = false;
diagonalUp = false;
diagonalDown = true;
}
}
}
public void boundsCheckY1(){
int temp;
if (Ball.ballY < 1) {
temp = rand.nextInt(5) + 1;
if(temp == 1) {
goRight = false;
goLeft = false;
goUp = false;
goDown = true;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 2) {
goRight = false;
goUp = false;
goDown = true;
goLeft = true;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 3) {
goRight = true;
goUp = false;
goDown = true;
goLeft = false;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 4) {
goRight = true;
goUp = false;
goDown = true;
goLeft = false;
diagonalUp = false;
diagonalDown = true;
} else if (temp == 5) {
goRight = false;
goUp = false;
goDown = true;
goLeft = true;
diagonalUp = false;
diagonalDown = true;
}
}
}
public void boundsCheckX2() {
int temp;
if (Ball.ballX > 559) {
temp = rand.nextInt(5) + 1;
if(temp == 1) {
goRight = false;
goLeft = true;
goUp = false;
goDown = false;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 2) {
goRight = false;
goUp = true;
goDown = false;
goLeft = true;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 3) {
goRight = false;
goUp = false;
goDown = true;
goLeft = true;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 4) {
goRight = false;
goUp = false;
goDown = false;
goLeft = true;
diagonalUp = true;
diagonalDown = false;
} else if (temp == 5) {
goRight = false;
goUp = false;
goDown = false;
goLeft = true;
diagonalUp = false;
diagonalDown = true;
}
}
}
public void boundsCheckY2() {
int temp;
if (Ball.ballY > 470) {
temp = rand.nextInt(5) + 1;
if(temp == 1) {
goRight = false;
goLeft = false;
goUp = true;
goDown = false;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 2) {
goRight = false;
goUp = true;
goDown = false;
goLeft = true;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 3) {
goRight = true;
goUp = true;
goDown = false;
goLeft = false;
diagonalUp = false;
diagonalDown = false;
} else if (temp == 4) {
goRight = true;
goUp = true;
goDown = false;
goLeft = false;
diagonalUp = true;
diagonalDown = false;
} else if (temp == 5) {
goRight = false;
goUp = true;
goDown = false;
goLeft = true;
diagonalUp = true;
diagonalDown = false;
}
}
}
}
Der Zuschauer-Klasse;
public class BallViewer {
/**
* creates the main frame
*
* @param args
*/
public static void main(String[] args) throws InterruptedException {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
try {
for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (Exception e) {
// If Nimbus is not available, you can set the GUI to another look and feel.
}
// new BallFrames().setVisible(true);
JFrame frame = new BallFrames(); // creates new JFrame
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Multi-Treaded Balls");// Sets the Title
frame.setVisible(true); // Makes the frame visible
frame.setResizable(false);
}
});
}
}
der Timer Zuhörer; public class TimerListener implements Action {
@Override
public void actionPerformed(ActionEvent event) {
String action = event.getActionCommand();
try {
movement();
} catch (InterruptedException ex) {
Logger.getLogger(TimerListener.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void movement() throws InterruptedException {
if(goLeft == true) {
Ball.ballX -= speed;
}
if(goRight == true) {
Ball.ballX += speed;
}
if(goUp == true) {
Ball.ballY -= speed;
}
if(goDown == true) {
Ball.ballY += speed;
}
if(diagonalUp == true) {
Ball.ballY += speed/2;
}
if(diagonalDown == true) {
Ball.ballY -= speed/2;
}
}
}
ich mehr als einen Ball in der Lage sein wollen, zu einem bestimmten Zeitpunkt auf dem Bildschirm hinzufügen, die ebenfalls um wie der erste Ball bewegt.
es Komponente erstreckt, krank fügen Sie es in den Code. – Ryan
Und was ist der Fehler, den Sie bekommen? – RealSkeptic
Entschuldigung, das war nur ein alter Kommentar in ihrem ist kein Fehler die Bälle scheinen nicht auf dem Bildschirm nach dem ersten hinzugefügt werden. – Ryan