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我试图显示一个图表,一旦文件被选中使用重绘方法,它不是提供给我任何错误,但有一些我做错了,它不显示图,我是新的涂料方法,所以我认为这就是为什么它不工作。JPanel Paint方法
代码:
private final JPanel buttonPanel = new JPanel();
private final JTextArea listArea = new JTextArea();
//private final JTextArea graphArea = new JTextArea();
下面的JPanel中我试图输出图表:
private final JPanel graphArea = new JPanel();
private final JButton read = new PosJButton("Read", 0);
private final JButton breadth = new PosJButton("Breadth", 0);
private final JButton depth = new PosJButton("Depth", 0);
我的类重绘面板:
private class graphArea extends JPanel {
public graphArea() {
graphArea.setPreferredSize(new Dimension(255,255));
}
@Override
public void paintComponent(Graphics g) {
}
}
//method creating a new gui
public static void makeAndShowGUI() {
graphGUI gGUI = new graphGUI();
gGUI.showGUI();
}
//setting items for gui
yout);
listArea.setRows(1);
);
contentPane.add(buttonPanel);
contentPane.add(graphArea);
newStation.addStation(name, posx, posy);
System.out.println("Station test: " + name + " " + posx + " " + posy);
}
else if(type.equals("Connection:")){
String statA = sc.next();
String statB = sc.next();
double dist = sc.nextDouble();
newStation.addConnection(statA, statB, dist);
System.out.println("Connection test: " + statA + " " + statB + " " + dist);
}
}
这里是哪里我正试图重绘jpanel graph区域:
graphArea.repaint();
}catch(FileNotFoundException ex){
JOptionPane.showMessageDialog(null, "invalid file format", "Error", JOptionPane.ERROR_MESSAGE);
}
}
}
});
我该怎么做? – codingmachine
@codingmachine,阅读[自定义绘画](http://docs.oracle.com/javase/tutorial/uiswing/painting/index.html)上的Swing教程部分的示例。 – camickr