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我正試圖在JFrame內的JPanel內繪製矩形。我想使用paintComponents(Graphics g)方法並重寫它,但由於某種原因,矩形沒有像我期望的那樣出現在JPanel中。任何幫助,將不勝感激。如何在JPanel中繪製矩形
public class RectangleFrame extends JFrame implements ActionListener {
JPanel buttonPanel;
JButton saveImage;
JButton clearImage;
JCheckBox intersections;
JCheckBox union;
JPanel drawingArea;
public RectangleFrame()
{
super();
setTitle("Rectangles");
setSize(600,600);
setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
buttonPanel = new JPanel();
buttonPanel.setBorder(BorderFactory.createLineBorder(Color.black));
this.add(buttonPanel, BorderLayout.SOUTH);
intersections = new JCheckBox("Draw Intersections");
buttonPanel.add(intersections);
union = new JCheckBox("Draw Union");
buttonPanel.add(union);
saveImage = new JButton("Save Image");
saveImage.setMargin(new Insets(0,0,0,0));
buttonPanel.add(saveImage);
clearImage = new JButton("Clear Image");
clearImage.setMargin(new Insets(0,0,0,0));
buttonPanel.add(clearImage);
drawingArea = new JPanel();
drawingArea.setBorder(BorderFactory.createLineBorder(Color.blue));
this.add(drawingArea, BorderLayout.CENTER);
}
}
class RectanglePanel extends JPanel
{
public RectanglePanel()
{
super();
}
@Override
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.setColor(Color.BLUE);
g.fillRect(25,25,100,30);
}
}
這裏是一個單獨的類我的主要方法:
public class SwingRectangle
{
/**
* @param args
*/
public static void main(String[] args)
{
// TODO Auto-generated method stub
RectangleFrame frame = new RectangleFrame();
RectanglePanel panel = new RectanglePanel();
frame.setVisible(true);
}
}
你在哪裏添加'RectanglePanel'到框架? –
我相信你想要覆蓋的方法是paintComponent(Graphics g)(沒有's')。確保你再調用super.paintComponent(g)。 paintComponent(g)是JComponent上的一個方法。 paintComponents(g)是Container上的一個方法。 –
在回答完成後刪除問題的新趨勢是什麼?我最近在SO上看過幾次。 – whiskeyspider