目前程序如下，请问，如何在Ex14中实现DrawPanel中的画图功能？


package Ex14;

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

public class DrawPanel extends JPanel
{
private MyColorChooser mcc;
public Color mycolor;

public DrawPanel()
{
mcc = new MyColorChooser();
}

public void set()
{
mycolor = mcc.mycolorchooser;
repaint();
}

public void paintComponent( Graphics g )
{
super.paint( g );
g.setColor( mycolor );
g.fillRect( 200, 100, 200, 100 );

}
}


package Ex14;

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

public class Ex14 extends JApplet
{
private MyColorChooser mcc;
private DrawPanel dp;
private JButton button;
private FlowLayout layout;

public Ex14()
{
Container container = getContentPane();
layout = new FlowLayout();
container.setLayout( layout );

mcc = new MyColorChooser();
dp = new DrawPanel();
container.add( mcc );

dp.repaint();

button = new JButton("OK");
button.addActionListener(
new ActionListener()
{
public void actionPerformed( ActionEvent actionEvent )
{
dp.repaint();
}
}

);
container.add( button );

setSize( 800, 600 );
setVisible( true );
}

}

还有一个类，MyColorChooser。
要实现用set方法来设置当前颜色的红、绿、蓝值。并在调用DrawPanel的set方法时要自动重绘自身。
现在好像连图像都画不出来………………
package Ex14;

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

public class MyColorChooser extends JPanel
{
private JSlider RSlider, GSlider, BSlider;
private JTextField Rtext, Gtext, Btext;
private JLabel RLabel, GLabel, BLabel;
private int RED=0, GREEN=0, BLUE=0;
public Color mycolorchooser;

public MyColorChooser( )
{
RSlider = new JSlider( SwingConstants.HORIZONTAL, 0, 255, 0 );
RSlider.setMajorTickSpacing( 10 );
RSlider.setPaintTicks( false );
RSlider.addChangeListener
(
new ChangeListener()
{
public void stateChanged( ChangeEvent e )
{
RED = RSlider.getValue();
Rtext.setText( Integer.toString( RED ) );
repaint();
}
}
);

GSlider = new JSlider( SwingConstants.HORIZONTAL, 0, 255, 0 );
GSlider.setMajorTickSpacing( 10 );
GSlider.setPaintTicks( false );
GSlider.addChangeListener
(
new ChangeListener()
{
public void stateChanged( ChangeEvent e )
{
GREEN = GSlider.getValue();
Gtext.setText( Integer.toString( GREEN ) );
repaint();
}
}
);

BSlider = new JSlider( SwingConstants.HORIZONTAL, 0, 255, 0 );
BSlider.setMajorTickSpacing( 10 );
BSlider.setPaintTicks( false );
BSlider.addChangeListener
(
new ChangeListener()
{
public void stateChanged( ChangeEvent e )
{
BLUE = BSlider.getValue();
Btext.setText( Integer.toString( BLUE ) );
repaint();
}
}
);

Rtext = new JTextField( 5 );
Rtext.setText( Integer.toString( RED ) );
Rtext.addActionListener(
new ActionListener()
{
public void actionPerformed( ActionEvent actionEvent )
{
RSlider.setValue( Integer.valueOf( Rtext.getText()) );
repaint();
}
}

);

Gtext = new JTextField( 5 );
Gtext.setText( Integer.toString( BLUE ) );
Gtext.addActionListener(
new ActionListener()
{
public void actionPerformed( ActionEvent actionEvent )
{
GSlider.setValue( Integer.valueOf( Gtext.getText()) );
repaint();
}
}

);

Btext = new JTextField( 5 );
Btext.setText( Integer.toString( GREEN ) );
Btext.addActionListener(
new ActionListener()
{
public void actionPerformed( ActionEvent actionEvent )
{
BSlider.setValue( Integer.valueOf( Btext.getText()) );
repaint();
}
}

);


RLabel = new JLabel( "RED:" );
GLabel = new JLabel( "GREEN:" );
BLabel = new JLabel( "BLUE:" );

add( RLabel );
add( Rtext );
add( RSlider );

add( GLabel );
add( Gtext );
add( GSlider );

add( BLabel );
add( Btext );
add( BSlider );
}

public void paintComponent( Graphics g )
{
super.paintComponent( g );
mycolorchooser = new Color( RED, GREEN, BLUE );
}

public Dimension getPreferredSize()
{
return new Dimension( 200, 180 );
}
}

可是这样的话救没有调用set方法了吧？

好的，调试去………………
再问件事情，就是这个button的布局问题，我们现在用的是BLUEJ，这个按钮怎么给它搞到那几个JSlider的正下方去？

[此贴子已经被作者于2006-11-29 20:58:41编辑过]

我把MyColorChooser放到BorderLayou.NORRH里面的时侯好像只能显示一行？？？

和把BorderLayout的setSize设的多大没有关系么……