Je veux dessiner JComponent draggable sur l'image de fond

Question

Il ya du code que l'un est un zoo, l'autre est animal (tiger et eagle sont le même code maintenant, donc je viens d'écrire Tiger.java). Je veux dessiner JComponent draggable sur l'image de fond. Draggable JComponent a été travaillé sur le cadre, pas d'image. D'abord, je clique sur l'image puis dessine mon animal, Deuxièmement, après avoir dessiné beaucoup d'animaux, je peux glisser et déposer mon animal n'importe où sur l'image. S'il vous plaît, enseignez-moi comment dessiner.

---

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 
import java.util.ArrayList; 

class BgPanel extends JPanel 
{ 
    Image bg = new ImageIcon("c:\\back.jpg").getImage(); 
    public void paintComponent(Graphics g) 
    { 
     g.drawImage(bg,0,0,getWidth(),getHeight(),this); 
    } 
} 

public class Zoo extends JFrame implements ActionListener 
{ 
    Container c; 
    JFrame frame = new JFrame(); 
    JComboBox comBox = new JComboBox(); 
    drawCanvas can = new drawCanvas(); 
    saving_drawing saving=new saving_drawing(); 
    Tiger tiger; 
    Eagle eagle; 
    Point point; 

    ArrayList<saving_drawing> arr_saving = new ArrayList(); 

    Zoo() 
    { 
     JPanel bgPanel = new BgPanel(); 
     bgPanel.setLayout(new BorderLayout()); 
     comBox.addItem("Tiger"); 
     comBox.addItem("Eagle"); 
     comBox.addActionListener(this); 

     frame.setContentPane(bgPanel); 

     bgPanel.add(comBox, BorderLayout.SOUTH); 
     bgPanel.add(can, BorderLayout.CENTER); 


     frame.setSize(500,500); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setTitle("Zoo"); 
     frame.setVisible(true); 
    } 
    public void actionPerformed(ActionEvent e) 
    { 
     if("Tiger".equals(comBox.getSelectedItem())) 
     { 
       saving.drawChoice=1; 
     } 
     else if("Eagle".equals(comBox.getSelectedItem())) 
     { 
       saving.drawChoice=2; 
     } 

    } 
    class drawCanvas extends JComponent 
    { 
     public drawCanvas() 
     { 
      this.addMouseListener(new MouseListener() 
      { 
       public void mouseClicked(MouseEvent e) 
       { 
        count++; 
        if(count!=0) 
        { 
        saving.point=e.getPoint(); 

        arr_saving.add(new saving_drawing(saving.drawChoice,saving.point)); 
        repaint(); 
        System.out.println("click"); 
        } 
       } 
       public void mouseEntered(MouseEvent e) {} 
       public void mouseExited(MouseEvent e) {} 
       public void mousePressed(MouseEvent e){} 
       public void mouseReleased(MouseEvent e){} 
      }); 
     } 
     public void paintComponent(Graphics g) 
     { 
      Graphics2D g2 = (Graphics2D)g; 

      for(int i=0;i<count;i++) 
      { 
       saving.drawChoice=arr_saving.get(i).drawChoice; 
       saving.point=arr_saving.get(i).point; 

       if(saving.drawChoice==1) 
       { 
        tiger=new Tiger(saving.point); 
        //frame.add(tiger); 
        //frame.setVisible(true); 
        //tiger.draw(g2); 
        //can.add(tiger); 
        tiger.paintComponent(g2); 
        //I'don't know what to do for drawing my tiger 
       } 
       if(saving.drawChoice==2) 
       { 
        eagle=new Eagle(saving.point); 
        eagle.draw(g2); 
       } 

      } 

     } 
    } 
    class saving_drawing 
    { 
     int drawChoice; 

     Point point; 
     saving_drawing(){} 
     saving_drawing(int dc, Point p) 
     { 
      this.drawChoice = dc; 
      this.point=p; 
     } 
    } 
    public static void main(String [] args) 
    { 
     Zoo test = new Zoo(); 
    } 
} 

---

import java.awt.*; 

import javax.swing.*; 

import java.awt.event.*; 
public class Tiger extends JComponent implements MouseListener 
{ 
    private boolean draggable = true; 

     protected Cursor draggingCursor = Cursor 
       .getPredefinedCursor(Cursor.HAND_CURSOR); 
     protected boolean overbearing = false; 

    save_drawing save = new save_drawing(); 

    Tiger(Point point) 
    { 

     save.point=point; 


     addMouseListener(this); 
     addDragListeners(); 
     setOpaque(true); 

    } 
    private void addDragListeners() 

    { 


     final Tiger handle = this; 

     addMouseMotionListener(new MouseAdapter() 

     { 
      public void mouseMoved(MouseEvent e) 

      { 

       save.point = e.getPoint(); 

      setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)); 

      } 
      public void mouseDragged(MouseEvent e) 

      { 

       int anchorX = save.point.x; 

       int anchorY = save.point.y; 
       Point parentOnScreen = getParent().getLocationOnScreen(); 

       Point mouseOnScreen = e.getLocationOnScreen(); 

       Point position = new Point(mouseOnScreen.x - parentOnScreen.x 

         - anchorX, mouseOnScreen.y - parentOnScreen.y - anchorY); 

       setLocation(position); 

       if (overbearing) 

       { 

        getParent().setComponentZOrder(handle, 0); 
        System.out.println("check"); 
        repaint(); 

       } 

      } 

     }); 

    } 

    public void paintComponent(Graphics g) 
    { 
     Graphics2D g2 = (Graphics2D)g; 
     super.paintComponent(g); 

     if (isOpaque()) 

     { 
      g.setColor(Color.black); 
      g.fillRect(save.point.x, save.point.y, 50, 50); 
     } 

    } 
    class save_drawing 
    { 
     Point point; 


    } 
    public void mouseClicked(MouseEvent e) 
    { 

     save.point=e.getPoint(); 

     repaint(); 
    } 
    public void mouseEntered(MouseEvent arg0){} 
    public void mouseExited(MouseEvent arg0) { 
    } 
    @Override 
    public void mousePressed(MouseEvent arg0) { 
    } 
    @Override 
    public void mouseReleased(MouseEvent arg0) { 
    } 
    private void removeDragListeners() 

     { 
      for (MouseMotionListener listener : this.getMouseMotionListeners()) 
      { 
       removeMouseMotionListener(listener); 
      } 
      setCursor(Cursor.getDefaultCursor()); 
     } 


} 

Answer 1

Pour faire glisser les composants autour d'un panneau, vous pouvez utiliser le Component Mover.