hi, was mache ich hier falsch, dass sich die Farbe nicht ändert, wenn ich auf den button gelb klicke?
Code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/* -------------------------------
Main Frame in program PaintShop
-------------------------------*/
public class PaintShop extends JFrame
implements MouseListener, MouseMotionListener {
private JButton button1;
private JButton button2;
private JButton button3;
private FlowLayout layout;
private Color color = Color.blue;
private DrawingPanel drawingPanel;
public PaintShop()
{
super( "PaintShop first version" );
layout = new FlowLayout();
Container c = getContentPane( );
c.setLayout ( layout );
button1 = new JButton("Yellow");
button2 = new JButton("Punkte");
button3 = new JButton("Linie");
drawingPanel = new DrawingPanel(0,0);
addMouseListener(this);
addMouseMotionListener(this);
c.add(button1);
c.add(button2);
c.add(button3);
c.add(drawingPanel);
button1 = new JButton();
button1.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e)
{
color = Color.yellow;}});
setSize( 750, 500 );
show();
}
/* ------------------------------
Listening for mouse activities
------------------------------*/
public void mouseClicked ( MouseEvent e )
{
}
public void mouseEntered ( MouseEvent e )
{
}
public void mouseExited ( MouseEvent e )
{
}
public void mousePressed ( MouseEvent e )
{
drawingPanel.setPaint();
}
public void mouseReleased ( MouseEvent e )
{
drawingPanel.setNotPaint();
}
/* -----------------------------
Listening for mouse movements
-----------------------------*/
public void mouseMoved ( MouseEvent e )
{
}
public void mouseDragged ( MouseEvent e )
{
drawingPanel.setX( e.getX() );
drawingPanel.setY( e.getY() );
drawingPanel.paintComponent(getGraphics());
}
/* ---------------------------------------
Class DrawingPanel
This Panel is used to draw a picture on
---------------------------------------*/
private class DrawingPanel extends JPanel {
private int xValue;
private int yValue;
private boolean paint;
public DrawingPanel(int x, int y) {
xValue = x;
yValue = y;
paint = false;
}
public void setX(int x) {
xValue = x;
}
public void setY(int y) {
yValue = y;
}
public void setPaint() {
paint = true;
}
public void setNotPaint() {
paint = false;
}
public void paintComponent(final Graphics g)
{
g.setColor(color);
g.drawLine(xValue, yValue, 4, 4);
}
public void update(Graphics g)
{}
}
/* -----------
MainProgram
-----------*/
public static void main( String args[] )
{
PaintShop app = new PaintShop();
app.addWindowListener(
new WindowAdapter()
{
public void windowClosing( WindowEvent e )
{
System.exit( 0 );
}
}
);
}
}
