使用Java繪製程序。 JPanel刷新不好

大家好我有幾個關於程序的問題：首先，我製作了2個JPanel，並將它們添加到帶有BorderLayout中心和East的主窗口。 Error 1 使用Java繪製程序。 JPanel刷新不好

程序看起來像那樣，但是當我開始繪製一些東西時，我的菜單出現在中心邊框佈局上，不知道是爲什麼。

Error 2

Additionaly當我minimalize或改變窗口大小的圖形自敗：/。

Error 3

第三件事，我只能畫折線（「拉馬納」），並再次我不知道如何使它畫一條簡單的直線（「Prosta」）。 Atm Prosta和Łamana一樣。

另外有時它會讓我看到幾個形狀（「Koło」） - 例如圓。

我的代碼：

主要

import java.awt.BasicStroke; 
import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.GridLayout; 
import java.awt.HeadlessException; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JComboBox; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 

public class edytor extends JFrame { 

/** 
* 
*/ 
private static final long serialVersionUID = 1L; 

public static String jaki, co = null; 
public static int jak, jak1; 

final static float dash1[] = { 10.0f }; 
final static BasicStroke dashed = new BasicStroke(1.0f, 
     BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, dash1, 0.0f); 

public edytor() throws HeadlessException { 
    super("PAINT"); 
    setLayout(new BorderLayout()); 
    setSize(840, 702); 
    setDefaultCloseOperation(DISPOSE_ON_CLOSE); 
    jak = 10; 
    co = "Łamana"; 
    jaki = "Czarny"; 

    JButton zapis = new JButton("Zapis"); 

    zapis.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent e) { 

     } 
    }); 

    JPanel prawyPanel = new JPanel(new GridLayout(5, 0)); 
    JPanel lewyPanel = new rysowanie(); 
    lewyPanel.setVisible(true); 
    prawyPanel.setVisible(true); 

    final JComboBox<String> coRysujemy = new JComboBox<String>(); 
    coRysujemy.setEditable(true); 
    coRysujemy.addItem("Łamana"); 
    coRysujemy.addItem("Kwadrat"); 
    coRysujemy.addItem("Koło"); 
    coRysujemy.addItem("Prosta"); 

    prawyPanel.add(coRysujemy); 

    coRysujemy.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent e) { 

      co = (String) coRysujemy.getSelectedItem(); 
     } 
    }); 

    final JComboBox<String> jakiKolor = new JComboBox<String>(); 
    jakiKolor.setEditable(true); 
    jakiKolor.addItem("Czarny"); 
    jakiKolor.addItem("Niebieski"); 
    jakiKolor.addItem("Zielony"); 
    prawyPanel.add(jakiKolor); 

    jakiKolor.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent e) { 

      jaki = (String) jakiKolor.getSelectedItem(); 
     } 
    }); 

    final JComboBox<String> jakGrube = new JComboBox<String>(); 
    jakGrube.setEditable(true); 
    jakGrube.addItem("10"); 
    jakGrube.addItem("20"); 
    jakGrube.addItem("30"); 
    prawyPanel.add(jakGrube); 

    jakGrube.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      jak = jakGrube.getSelectedIndex(); 
     } 
    }); 

    final JComboBox<String> jakRysowane = new JComboBox<String>(); 
    jakRysowane.setEditable(true); 
    jakRysowane.addItem("Nie Przerywane"); 
    jakRysowane.addItem("Przerywane"); 
    prawyPanel.add(jakRysowane); 
    prawyPanel.add(zapis); 
    lewyPanel.setBackground(Color.WHITE); 
    add(lewyPanel, BorderLayout.CENTER); 
    add(prawyPanel, BorderLayout.EAST); 

    jakRysowane.addActionListener(new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      jak1 = jakRysowane.getSelectedIndex(); 
     } 
    }); 

} 

public static void main(String[] args) { 
    edytor ramka = new edytor(); 
    ramka.setVisible(true); 

} 

}

繪圖窗口面板

import java.awt.BasicStroke; 
import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 

import javax.swing.JPanel; 

public class rysowanie extends JPanel { 

/** 
* 
*/ 
private static final long serialVersionUID = 636480153152364773L; 
private int squareX; 
private int squareY; 
private int squareW; 
private int squareH; 
private int xstart, ystart, xend, yend; 

public rysowanie() { 
    // TODO Auto-generated constructor stub 

} 

public void paint(Graphics g) { 
    Graphics2D g2 = (Graphics2D) g; 

    if (edytor.jak == 1) { 
     edytor.jak = 10; 
    } 
    if (edytor.jak == 2) { 
     edytor.jak = 20; 
    } 

    if (edytor.jak == 3) { 
     edytor.jak = 30; 
    } 

    addMouseListener(new MouseAdapter() { 
     public void mousePressed(MouseEvent e) { 
      squareX = e.getX(); 
      squareY = e.getY(); 
      repaint(); 

     } 

     public void mouseReleased(MouseEvent e) { 
      if (e.getX() > squareX) 
       squareW = e.getX() - squareX; 
      else { 
       squareW = squareX - e.getX(); 
       squareX = e.getX(); 
      } 
      if (e.getY() > squareY) 
       squareH = e.getY() - squareY; 
      else { 
       squareH = squareY - e.getY(); 
       squareY = e.getY(); 
      } 
      repaint(); 
     } 

    }); 

    addMouseListener(new MouseAdapter() { 
     public void mousePressed(MouseEvent e) { 
      xstart = e.getX(); 
      ystart = e.getY(); 
      repaint(); 

     } 

     public void mouseReleased(MouseEvent e) { 
      xend = e.getX(); 
      yend = e.getY(); 
      repaint(); 

     } 

    }); 

    if (edytor.co == "Kwadrat") { 
     if (edytor.jaki == "Niebieski") { 
      g.setColor(Color.BLUE); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g.drawRect(squareX, squareY, squareW, squareH); 
     } 
     if (edytor.co == "Czarny") { 
      g.setColor(Color.BLACK); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g.drawRect(squareX, squareY, squareW, squareH); 
     } 
     if (edytor.jaki == "Zielony") { 
      g.setColor(Color.GREEN); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g.drawRect(squareX, squareY, squareW, squareH); 
     } 
    } 

    if (edytor.co == "Łamana") { 
     if (edytor.jaki == "Niebieski") { 
      g.setColor(Color.BLUE); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g2.drawLine(xstart, ystart, xend, yend); 
     } 
     if (edytor.jaki == "Czarny") { 
      g.setColor(Color.BLACK); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g.drawLine(xstart, ystart, xend, yend); 
     } 
     if (edytor.jaki == "Zielony") { 
      g.setColor(Color.GREEN); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g.drawLine(xstart, ystart, xend, yend); 
     } 
    } 

    if (edytor.co == "Koło") { 
     if (edytor.jaki == "Niebieski") { 
      g.setColor(Color.BLUE); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g.drawOval(squareX, squareY, squareW, squareH); 
     } 
     if (edytor.jaki == "Czarny") { 
      g.setColor(Color.BLACK); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g.drawOval(squareX, squareY, squareW, squareH); 
     } 
     if (edytor.jaki == "Zielony") { 
      g2.setColor(Color.GREEN); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g2.drawOval(squareX, squareY, squareW, squareH); 
     } 
    } 

    if (edytor.co == "Prosta") { 

     if (edytor.jaki == "Niebieski") { 
      g.setColor(Color.BLUE); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g2.drawLine(xstart, ystart, xend, yend); 
     } 
     if (edytor.jaki == "Czarny") { 
      g.setColor(Color.BLACK); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g.drawLine(xstart, ystart, xend, yend); 
     } 
     if (edytor.jaki == "Zielony") { 
      g.setColor(Color.GREEN); 
      g2.setStroke(new BasicStroke(edytor.jak)); 
      if (edytor.jak1 == 1) { 
       g2.setStroke(edytor.dashed); 
      } 
      g.drawLine(xstart, ystart, xend, yend); 
     } 
    } 

} 

}

很想任何提示。

來源

2014-06-07 FilOle

[JPanel repaint issue]的可能重複（http://stackoverflow.com/questions/7213178/jpanel-repaint-issue） – trashgod

當您通過在paint方法中不撥打super.paint()來破壞塗料鏈時發生這種情況。你看到的是由於沒有清除油漆區域而遺留的奇怪的油漆痕跡（通過調用super.paint()完成）

而不是覆蓋paint()，而應該覆蓋paintComponent。

@Override 
protected void paintComponent(Graphics g) { 
    super.paintComponent(g); 
}

注意：當您做呼叫super.paint[Component]，這也將清除繪製的前行，這可能不是你想要的功能。您有任何相關的幾個選項：

您可以創建ListPoint2D的對象，點添加到列表和重複，雖然在paintComponent方法列表從點畫線點。
您可以繪製每行到BufferedImage並在paintComponent方法中繪製圖像。

也不符合==比較字符串。使用eqauls()。谷歌How do I compare Strings in Java

以供將來參考，這個網站是不是一個服務檯，你不應該指望用戶/應答者幫助調試一堆不同的問題。你應該問一個具體問題的具體問題。如果您有多個問題，請將問題分解到不同的帖子。

來源

2014-06-07 11:40:37

使用Java繪製程序。 JPanel刷新不好

回答

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