Ball Animation en Swing
l problema es cuando cambio el tamaño de laJFrame la animación continúa con sus dimensiones proporcionadas previamente paraJComponent. ¿Hay alguna manera de actualizar miwidth yheight variables a medida que redimensiono laJFrame, para que la animación pueda ejecutarse junto con las nuevas coordenadas.
En términos más simples, diga elJComponent tiene @ iniciwidth = 300 yheight = 300, entonces elBALL se mueve dentro de estos @ especificadCo-ordinates. Ahora si cambio el tamaño de miJFrame, el tamaño de laJComponent todavía permanece como está, es decir,width = 300 yheight = 300, pero lo que esperaba era una forma de modificar estas variables con el tamaño actual de la ventana. Avíseme si me falta algo para explicar mi problema.
Aquí está el código que estoy usando:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class BallAnimation
{
private int x;
private int y;
private int count;
private int width;
private int height;
private int speedValue;
private boolean flag;
/*
* These variables are used to keep track of
* the ball, either it is going LEFT or RIGHT
* depending on that, we will set the
* Co-ordinates.
*/
private boolean toLeft, toRight;
private boolean fromTop, fromBottom;
private Timer timer;
private JButton button;
private ActionListener actionTimer;
private ActionListener buttonAction;
public BallAnimation()
{
x = y = count = 0;
flag = toLeft = false;
toRight = true;
fromTop = true;
fromBottom = false;
speedValue = 5;
}
public static void main(String args[])
{
Runnable runnable = new Runnable()
{
public void run()
{
BallAnimation animation = new BallAnimation();
animation.go();
}
};
SwingUtilities.invokeLater(runnable);
}
public void go()
{
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//JPanel contentPane = new JPanel();
/*
* Class Name :
* Java Naming Convention says that class names
* should be in Pascal Case, i.e. the first
* letter of the class name should be capitalized
* and every new word must start with a capitalized
* Alphabet.
* For Example :
* public class ClassName{...}
* ----------------------------------------------------------
* Variable Name :
* Java Naming Convention says that the variable name
* should be in Camel Case, i.e. the first letter of
* the variable name should be small case or _ (underscore)
* and every new word must start with a capitalized
* Alphabet.
* ---------------------------------------------------------
*/
final MyDraw drawPanel = new MyDraw(0, 0);
x = drawPanel.getXValue();
y = drawPanel.getYValue();
//contentPane.add(drawPanel);
actionTimer = new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
if (fromTop && !fromBottom && x < width && y < height
&& toRight && !toLeft)
{
x += speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x < width && y >= height
&& toRight && !toLeft)
{
/*
* Since the ball coming from the TOP LEFT Side
* touched the BOTTOM of the JPanel.
*/
y -= speedValue;
x += speedValue;
fromTop = false;
fromBottom = true;
}
else if (!fromTop && fromBottom && x < width && y <= 0
&& toRight && !toLeft)
{
/*
* Since the ball coming from BOTTOM LEFT Side
* touched the TOP of the JPanel.
*/
fromTop = true;
fromBottom = false;
x += speedValue;
y += speedValue;
}
else if (!fromTop && fromBottom && x < width && y < height
&& toRight && !toLeft)
{
x += speedValue;
y -= speedValue;
}
else if (!fromTop && fromBottom && x >= width && y < height
&& toRight && !toLeft)
{
/*
* Since the ball coming from the BOTTOM LEFT Side
* touched the RIGHT Side of the JPanel.
*/
toRight = false;
toLeft = true;
x -= speedValue;
y -= speedValue;
}
else if (!fromTop && fromBottom && x < width && y <= 0
&& !toRight && toLeft)
{
/*
* Since the ball coming from the BOTTOM RIGHT Side
* touched the Top Side of the JPanel.
*/
fromTop = true;
fromBottom = false;
x -= speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x <= 0 && y < height
&& !toRight && toLeft)
{
/*
* Since the ball coming from the TOP RIGHT Side
* touched the LEFT Side of the JPanel.
*/
toRight = true;
toLeft = false;
x += speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x >= width && y < height
&& toRight && !toLeft)
{
/*
* Since the ball coming from the TOP LEFT Side
* touched the RIGHT Side of the JPanel
*/
toRight = false;
toLeft = true;
x -= speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x < width && y < height
&& !toRight && toLeft)
{
x -= speedValue;
y += speedValue;
}
else if (!fromTop && fromBottom && x <= 0 && y < height
&& !toRight && toLeft)
{
/*
* Since the ball coming from the BOTTOM RIGHT Side
* touched the LEFT Side of the JPanel.
*/
toRight = true;
toLeft = false;
x += speedValue;
y -= speedValue;
}
else if (!fromTop && fromBottom && x < width && y < height
&& !toRight && toLeft)
{
x -= speedValue;
y -= speedValue;
}
else if (fromTop && !fromBottom && x < width && y >= height
&& !toRight && toLeft)
{
/*
* Since the ball coming from the TOP RIGHT Side
* touched the BOTTOM Side of the JPanel.
*/
fromTop = false;
fromBottom = true;
x -= speedValue;
y -= speedValue;
}
System.out.println("X : " + x);
System.out.println("Y : " + y);
System.out.println("Direction is LEFT : " + toLeft);
System.out.println("Direction is RIGHT : " + toRight);
System.out.println("Coming from TOP : " + fromTop);
System.out.println("Coming from BOTTOM : " + fromBottom);
drawPanel.setXYValues(x, y);
}
};
buttonAction = new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
if (!flag)
{
timer.start();
button.setText("STOP ANIMATION");
flag = true;
}
else if (flag)
{
timer.stop();
button.setText("START ANIMATION");
flag = false;
}
}
};
button = new JButton("START ANIMATION");
button.addActionListener(buttonAction);
frame.getContentPane().add(drawPanel, BorderLayout.CENTER);
frame.getContentPane().add(button, BorderLayout.PAGE_END);
frame.setSize(300, 300);
//frame.pack();
frame.setVisible(true);
timer = new Timer(40, actionTimer);
width = drawPanel.getWidth() - 30;
System.out.println("WIDTH : " + width);
height = drawPanel.getHeight() - 30;
System.out.println("HEIGHT : " + height);
}
class MyDraw extends JComponent
{
private int x;
private int y;
private Timer timer;
public MyDraw(int x, int y)
{
this.x = x;
this.y = y;
}
public int getXValue()
{
return x;
}
public int getYValue()
{
return y;
}
public void setXYValues(int x, int y)
{
this.x = x;
this.y = y;
repaint();
}
public Dimension getPreferredSize()
{
return (new Dimension(300, 300));
}
public void paintComponent(Graphics g)
{
g.setColor(Color.WHITE);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.BLUE);
g.fillOval(x, y, 40, 40);
}
}
}