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ペイントコンポーネントとグラフィックス2Dを使用してJPanelに線を描画していますが、JPanelの背景は、ユーザーがいくつかの寸法を入力したときに描画されるグリッドに設定されています。ボタンがクリックされたときにJPanelに描画された線をクリアし、グリッド線が描画された状態で新しいパネルを再生成するにはどうすればよいですか?クリアボタンのアクションイベントメソッドを使用して、repaint()、removeAll()を使用し、JPanelの新しいインスタンスを作成しようとしましたが、いずれも機能しないようです。

メインのパネル機能とボタン機能を備えたクラスのコードは次のとおりです。

package floorplan;

/**
*
* @author xodkx
*/


import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.SwingUtilities;


public class FloorPlan extends JFrame 
{

private JPanel backPanel = new JPanel();
private JPanel toolsPanel = new JPanel();
private JFrame chooseFurniture;
private JFrame chooseFixture;
private JFrame chooseFramework;
private JButton furnitureButton = new JButton();
private JButton fixturesButton = new JButton();
private JButton frameworkButton = new JButton();
private JButton deleteButton = new JButton();
private JButton saveButton = new JButton();
private JButton clearButton = new JButton();
private JButton closeButton = new JButton();
private JRadioButton wall = new JRadioButton("Wall");
private JRadioButton door = new JRadioButton("Door");
private JRadioButton window = new JRadioButton("Window");


Floor floor = new Floor();

public FloorPlan()
{
     super("Floor Plan Generator");  
     createWindow();
     buttonFunctions();
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     pack();
     setVisible(true);
}

private void createWindow()
{
  backPanel.setLayout(new BorderLayout());
  backPanel.setBorder(BorderFactory.createEmptyBorder(200, 200, 200, 200));
  GridLayout panelLayout = new GridLayout();
  frameworkButton.setText("Framework");
  fixturesButton.setText("Fixtures");
  furnitureButton.setText("Furniture");
  deleteButton.setText("Delete");
  saveButton.setText("Save");
  clearButton.setText("Clear");

  add(backPanel, BorderLayout.CENTER);
  backPanel.add(toolsPanel, BorderLayout.NORTH);
  backPanel.add(floor, BorderLayout.CENTER);
  backPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
  toolsPanel.add(frameworkButton);
  toolsPanel.add(fixturesButton);
  toolsPanel.add(furnitureButton);
  toolsPanel.add(deleteButton);
  toolsPanel.add(saveButton);
  toolsPanel.add(clearButton);
  add(backPanel); 
}


private void buttonFunctions()
{
    frameworkButton.addActionListener(new ActionListener()
    {
        @Override
        public void actionPerformed(final ActionEvent e)
        {
           chooseFramework = new JFrame("Pick A Framework");
           chooseFramework.setSize(250,250);
           chooseFramework.setLayout(new GridLayout(4,1));
           chooseFramework.add(wall);
           chooseFramework.add(door);
           chooseFramework.add(window);
           chooseFramework.add(closeButton);
           closeButton.setText("Close");


           wall.addActionListener(new ActionListener() 
          {
                @Override
                public void actionPerformed(ActionEvent e) 
          {

               floor.setFramework(Framework.WALL);



        }});

            door.addActionListener(new ActionListener() 
          {
                @Override
                public void actionPerformed(ActionEvent e) 
          {

               floor.setColor(Color.RED);
               floor.setFramework(Framework.DOOR);


        }});

            window.addActionListener(new ActionListener() 
          {
                @Override
                public void actionPerformed(ActionEvent e) 
          {
               floor.setColor(Color.BLUE);
               floor.setFramework(Framework.WALL);


        }});

           closeButton.addActionListener(new ActionListener() 
           {
                @Override
            public void actionPerformed(ActionEvent e) 
            {
               chooseFramework.setVisible(false);

            }
           });

            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            pack();
            chooseFramework.setVisible(true);
        }
    });

    furnitureButton.addActionListener(new ActionListener()
    {
        @Override
        public void actionPerformed(final ActionEvent e)
        {
           chooseFurniture = new JFrame("Pick Furniture to add");
           chooseFurniture.setSize(250,250);
           chooseFurniture.setLayout(new GridLayout(4,1));
           chooseFurniture.add(closeButton);
           closeButton.setText("Close");

           closeButton.addActionListener(new ActionListener() 
           {
                @Override
            public void actionPerformed(ActionEvent e) 
            {
               chooseFurniture.setVisible(false);
            }
           });

            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            pack();
            chooseFurniture.setVisible(true);
        }
    });

    fixturesButton.addActionListener(new ActionListener()
    {
        @Override
        public void actionPerformed(final ActionEvent e)
        {
           chooseFixture = new JFrame("Pick Furniture to add");
           chooseFixture.setSize(250,250);
           chooseFixture.setLayout(new GridLayout(4,1));
           chooseFixture.add(closeButton);
           closeButton.setText("Close");

           closeButton.addActionListener(new ActionListener() 
           {
                @Override
            public void actionPerformed(ActionEvent e) 
            {
               chooseFixture.setVisible(false);
            }
           });

            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            pack();
            chooseFixture.setVisible(true);
        }
    });

      **clearButton.addActionListener(new ActionListener()
    {
        @Override
        public void actionPerformed(final ActionEvent e)
        {  
          **//THIS IS WHERE I WANT TO CLEAR THE JPANEL WHEN THIS BUTTON IS CLICKED**  
        }
   });**
}    
public static void main(String[] args) 
{
    SwingUtilities.invokeLater(new Runnable()
     {

        @Override
          public void run()
          {
            FloorPlan floorPlan = new FloorPlan();
          }

     });
}
}

これは、すべてのグラフィックスを実行し、JPanelを利用するクラスです。

package floorplan;

/**
*
* @author xodkx
*/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.image.BufferedImage;
import java.awt.event.MouseListener;

public class Floor extends JPanel implements MouseListener, MouseMotionListener
{


private static final int WIDTH = Integer.parseInt(JOptionPane.showInputDialog("Please    
                                                   enter the width of your room"));
private static final int LENGTH = Integer.parseInt(JOptionPane.showInputDialog("Please 
                                                 enter the width of your room"));
private static final Color BACKGROUND = Color.WHITE;
private static final Color INITIAL_COLOUR = Color.BLACK;
private static final Framework INITIAL_FRAMEWORK = Framework.WALL;

private MouseState state = MouseState.IDLE;
private Framework frameworkType = INITIAL_FRAMEWORK;
private Color colour = INITIAL_COLOUR;


private Point start = null;
private Point end = null;
private Point startpt = null;
private Point endpt = null;

private BufferedImage bufImage = null;


public Floor()
{
    setPreferredSize(new Dimension(LENGTH,WIDTH));
    setBackground(Color.white);
    setBorder(BorderFactory.createLineBorder (Color.black, 5));

    this.addMouseListener(this);
    this.addMouseMotionListener(this);

}

public void setColor(Color color)
{
    colour = color;

}

public void setFramework(Framework framework)
{
    frameworkType = framework;
}

@Override
public void paintComponent(Graphics g)
{
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D)g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
      RenderingHints.VALUE_ANTIALIAS_ON);

    if(bufImage == null)
    {
        int h = this.getHeight();
        int w = this.getWidth();
        bufImage = (BufferedImage)this.createImage(h,w);
        Graphics2D gc = bufImage.createGraphics();
        gc.setColor(BACKGROUND);
        gc.fillRect(0, 0, w, h);
    }


    g2.drawImage(bufImage,null,0,0);

    drawGrid(g2);

    if(state == MouseState.DRAGGING)
    {
        createComponent(g2);
    }
}

public void drawGrid(Graphics g2)
{
    int gridDivisions = 20;
    int divisionSize = WIDTH/gridDivisions;
    int grid = WIDTH*LENGTH;

    g2.setColor(Color.lightGray);

    for(int i=1; i<grid; i++)
    {
        int x = i * divisionSize;
        g2.drawLine(x,0,x,getSize().height);
    }

    for(int i=1; i<grid; i++)
    {
        int y = i*divisionSize;
        g2.drawLine(0,y,getSize().width,y);
    }
}


public void createComponent(Graphics2D g2)
{
    g2.setColor(colour);

    switch (frameworkType)
    {
        case WALL:
            g2.setStroke(new BasicStroke(5));
            g2.drawLine(start.x, start.y, end.x,end.y);
            break;

        case DOOR:
            g2.setStroke(new BasicStroke(5));
            g2.drawLine(start.x, start.y, end.x,end.y);
            break;

        case WINDOW:
            g2.setStroke(new BasicStroke(5));
            g2.drawLine(start.x, start.y, end.x,end.y);
            break;


        default:
            g2.drawString("test", 10, 20);
            break;
    }
}


@Override
public void mousePressed(MouseEvent e)
{
    state = MouseState.DRAGGING;
    start = e.getPoint();
    end = start;
}

@Override

public void mouseDragged(MouseEvent e)
{

    state = MouseState.DRAGGING;
    end = e.getPoint();
    this.repaint();

}

@Override
public void mouseReleased(MouseEvent e)
{
    end = e.getPoint();
    if(state == MouseState.DRAGGING)
    {
        state = MouseState.IDLE;
        createComponent(bufImage.createGraphics());
        this.repaint();
    }
}



@Override
public void mouseClicked(MouseEvent e)
{

}

@Override
public void mouseEntered(MouseEvent e)
{

}

@Override
public void mouseExited(MouseEvent e)
{

}



@Override
public void mouseMoved(MouseEvent e)
{

}

}
4

1 に答える 1

1

グリッドを表示するロジックをどのように組み込むかは明確ではありません。これは、アイデアを提供するためだけに切り替える方法の例です。クラスで、グリッドを表示するかどうかを制御するフラグをFloor追加します。boolean次に、このフラグFloor.paintComponent()の値に基づいてグリッドを描画します。booleanフラグの値を変更すると、再描画がトリガーされます。FloorPlan次に、アクションまたはその他のプログラム ロジックに応答して、クラスからこのフラグの値を変更します。clearボタンがクリックされたときにグリッドを切り替える簡単な実装を次に示します。

フロアクラス:

private boolean displayGrid = true;

public boolean isDisplayGrid() {
    return displayGrid;
}
public void setDisplayGrid(boolean displayGrid) {
    this.displayGrid = displayGrid;
    repaint();
}

@Override
public void paintComponent(Graphics g) {
    super.paintComponent(g);
    ...
    if (displayGrid)
        drawGrid(g2);
}

フロアプラン クラス:

clearButton.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(final ActionEvent e) {
        floor.setDisplayGrid(!floor.isDisplayGrid());
    }
});

編集:

私はあなたの質問を完全に誤解しているようです。私が正しく理解している場合は、ボタンをクリックして図面をクリアしたいと考えています。すべての図面はクラスbufImageで行われているようです。Floorこのイメージをリセットするだけです。

フロアクラス:

public void clear() {
    bufImage.flush();
    bufImage = null;
    repaint();
}

フロアプラン クラス:

clearButton.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(final ActionEvent e) {
        floor.clear();
    }
});
于 2013-02-06T19:01:46.910 に答える