Adding multiple images to JPanel for dragging and dropping purposes

Question

LianaN 0 Posting Whiz in Training

13 Years Ago

Hi!

I'm trying to improve a code shown below. My idea is to add multiple images to JPanel. It sounds like an easy task, but all my attempts failed so far. I tried to create Image image2 = getToolkit().getImage(Drag1.class.getResource("cross_cursor.gif")); and then bi2 = new BufferedImage(image2.getWidth(this), image2.getHeight(this)...); . But I can see only one image on the JPanel. Could anybody help please? Thanks a lot!

import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Drag1 extends JFrame {
  DisplayCanvas canvas;

  public Drag1() {
    super();
    Container container = getContentPane();

    canvas = new DisplayCanvas();
    container.add(canvas);

    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    setSize(450, 400);
    setVisible(true);
  }

  public static void main(String arg[]) {
    new Drag1();
  }
}

class DisplayCanvas extends JPanel {
  int x, y;

  BufferedImage bi;

  DisplayCanvas() {
    setBackground(Color.white);
    setSize(450, 400);
    addMouseMotionListener(new MouseMotionHandler());

    Image image = getToolkit().getImage(Drag1.class.getResource("hand_cursor.gif"));

    MediaTracker mt = new MediaTracker(this);
    mt.addImage(image, 1);
    try {
      mt.waitForAll();
    } catch (Exception e) {
      System.out.println("Exception while loading image.");
    }

    if (image.getWidth(this) == -1) {
      System.out.println("no gif file");
      System.exit(0);
    }

    bi = new BufferedImage(image.getWidth(this), image.getHeight(this),
        BufferedImage.TYPE_INT_ARGB);
    Graphics2D big = bi.createGraphics();
    big.drawImage(image, 0, 0, this);
  }

  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2D = (Graphics2D) g;

    g2D.drawImage(bi, x, y, this);
  }

  class MouseMotionHandler extends MouseMotionAdapter {
    public void mouseDragged(MouseEvent e) {
      x = e.getX();
      y = e.getY();
      repaint();
    }
  }
}

java

Edited 13 Years Ago by LianaN because: n/a

7 Contributors
17 Replies
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Akill10 96 Posting Pro

13 Years Ago

But you have only loaded 1 image?

JamesCherrill 4,733 Most Valuable Poster

13 Years Ago

paintComponent still only paints the first image
g2D.drawImage(bi, x, y, this);

The draws to big and big2 don't achieve anythig as far as I can see

Edited 13 Years Ago by JamesCherrill because: n/a

quuba 81 Posting Pro

13 Years Ago

Write new class ie. ImageRectangle extends Rectangle and in single constructor put your BuferredImage and Rectangle parameters

public ImageRectangle(int x, int y, int w, int h, BufferedImage bi) {
            super(x, y, w, h);
            this.bi = bi;
        }

Override Rectangle method

public boolean contains(Point p)

write own method

public void drawImage(Graphics2D g2)

Image is a rectangle, x,y,width,height are just common.

quuba 81 Posting Pro

13 Years Ago

line 2,7 delete them, you have direct access to x, y, w, h, (extends Rectangle!)
Rectangle have a method contains(Point p)
In place of 13 write return super.contains(p)

public void drawImage(Graphics2D g2) {
            g2.drawImage(bi, x, y, null);
        }

Invoke this method for two images in Drag1 paintComponent(...) method

protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        img1.drawImage(g2);
        img2.drawImage(g2);
    }

//

class GraphicDragController extends MouseInputAdapter {

    Drag2 component;

    public GraphicDragController(Drag2 gdad) {
        component = gdad;
        component.addMouseListener(this);
        component.addMouseMotionListener(this);
    }

    public void mousePressed(MouseEvent e) {
        Point p = e.getPoint();
        component.img1.mousePressed(p);
        component.img2.mousePressed(p);
        component.repaint();
    }

    public void mouseReleased(MouseEvent e) {
        component.img1.mouseReleased();
        component.img2.mouseReleased();
        component.repaint();
    }

    public void mouseDragged(MouseEvent e) {
        Point p = e.getPoint();
        component.img1.mouseDragged(p);
        component.img2.mouseDragged(p);
        component.repaint();
    }
}

Class ImageRectangle should handle mouse events

Loading images put to the constructor

ImageRectangle img1;
    ImageRectangle img2;

    public Drag1() {
        try {
            Image image1 = ImageIO.read(getClass().getResource("ScanImage30.jpg"));
            BufferedImage bi1 = new BufferedImage(image1.getWidth(this), image1.getHeight(this),
                    BufferedImage.TYPE_INT_ARGB);
            Graphics2D big = bi1.createGraphics();
            big.drawImage(image1, 0, 0, this);
            img1 = new ImageRectangle("alfa", 10, 100, bi1.getWidth(), bi1.getHeight(), bi1);

            Image image2 = ImageIO.read(getClass().getResource("y00000001.jpg"));
            BufferedImage bi2 = new BufferedImage(image2.getWidth(this), image2.getHeight(this),
                    BufferedImage.TYPE_INT_ARGB);
            Graphics2D big2 = bi2.createGraphics();
            big2.drawImage(image2, 0, 0, this);
            img2 = new ImageRectangle("beta", 100, 100, bi2.getWidth(), bi2.getHeight(), bi2);
        } catch (IOException ex) {
            //
        }
    }

Edited 13 Years Ago by quuba because: public Drag1() lines 11 ,18 changed

quuba 81 Posting Pro

13 Years Ago

As usual, page 2 is shown, but I have not noticed this.

I guess that IF...THEN should be added to GraphicDragController in order to check an image to be moved.

So, too quickly I removed this option (usefull)
Line 107 fault

Edited 13 Years Ago by quuba because: n/a

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LianaN 0 Posting Whiz in Training · Answer 1 · 2010-12-19T21:27:02+00:00

Sorry, initially I decided to post a code with 1 image, and to explain in the text my attempts to add more images.

Ok, now I'm posting my full code for 2 images. This code does not work correctly, because I can see only 1 image in JPanel. Please, any help is highly appreciated.

import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.TitledBorder;

public class Drag1 extends JFrame {
  DisplayCanvas canvas;

  public Drag1() {
    super();
    Container container = getContentPane();

    canvas = new DisplayCanvas();
    container.add(canvas);

    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    setSize(450, 400);
    setVisible(true);
  }

  public static void main(String arg[]) {
    new Drag1();
  }
}

class DisplayCanvas extends JPanel {
  int x, y;

  BufferedImage bi; BufferedImage bi2;

  DisplayCanvas() {
    setBackground(Color.white);
    setSize(450, 400);
    addMouseMotionListener(new MouseMotionHandler());

    Image image = getToolkit().getImage(Drag1.class.getResource("hand_cursor.gif"));
    Image image2 = getToolkit().getImage(Drag1.class.getResource("hand_cursor2.gif"));

    MediaTracker mt = new MediaTracker(this);
    mt.addImage(image, 1);
    try {
      mt.waitForAll();
    } catch (Exception e) {
      System.out.println("Exception while loading image.");
    }

    MediaTracker mt2 = new MediaTracker(this);
    mt2.addImage(image2, 1);
    try {
      mt2.waitForAll();
    } catch (Exception e) {
      System.out.println("Exception while loading image.");
    }

    if ((image.getWidth(this) == -1) || (image2.getWidth(this) == -1)) {
      System.out.println("no gif file");
      System.exit(0);
    }

    bi = new BufferedImage(image.getWidth(this), image.getHeight(this),
        BufferedImage.TYPE_INT_ARGB);
    Graphics2D big = bi.createGraphics();
    big.drawImage(image, 0, 0, this);

    bi2 = new BufferedImage(image.getWidth(this), image.getHeight(this),
        BufferedImage.TYPE_INT_ARGB);
    Graphics2D big2 = bi2.createGraphics();
    big2.drawImage(image2, 50, 50, this);
  }

  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2D = (Graphics2D) g;

    g2D.drawImage(bi, x, y, this);
  }

  class MouseMotionHandler extends MouseMotionAdapter {
    public void mouseDragged(MouseEvent e) {
      x = e.getX();
      y = e.getY();
      repaint();
    }
  }
}

LianaN 0 Posting Whiz in Training · Answer 2 · 2010-12-20T00:47:04+00:00

I changed the paintComponent method:

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2D = (Graphics2D) g;

    g2D.drawImage(bi, x, y, this);

    g2D.drawImage(bi2, x + 50, y + 50, this);
  }

..but still can see only one image... What else could be wrong?

LianaN 0 Posting Whiz in Training · Answer 3 · 2010-12-20T01:23:33+00:00

I worked out another piece of code that creates two rectangles. In this case I can drag and drop these two rectangles. But how can I substitute rectangle objects to GIF images?

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.MouseInputAdapter;

public class Drag1 extends JPanel {
    Rectangle img1 = new Rectangle(100,100,150,75);
    Rectangle img2 = new Rectangle(150,150,200,75);

    boolean draggingIMG1, draggingIMG2 = false;


    protected void paintComponent(Graphics g) {

        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setPaint(Color.blue);
        g2.draw(img1);

        g2.setPaint(Color.red);
        g2.draw(img2);
    }

    public void setRect(int x, int y) {
        if(draggingIMG1)
        img1.setLocation(x, y);
        else
        img2.setLocation(x+20, y+20);
        repaint();
    }

    public static void main(String[] args) {
        Drag1 test = new Drag1();
        new GraphicDragController(test);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(test);
        f.setSize(400,400);
        f.setLocation(100,100);
        f.setVisible(true);
    }
}

class GraphicDragController extends MouseInputAdapter {
    Drag1 component;
    Point offset = new Point();

    public GraphicDragController(Drag1 gdad) {
        component = gdad;
        component.addMouseListener(this);
        component.addMouseMotionListener(this);
    }

    public void mousePressed(MouseEvent e) {
        Point p = e.getPoint();
        Rectangle r;

       if(component.img1.contains(p))
       {
    	   r = component.img1;
	       offset.x = p.x - r.x;
	       offset.y = p.y - r.y;
	       component.draggingIMG1 = true;
       }
       else if(component.img2.contains(p))
       {
    	   r = component.img2;
    	       offset.x = p.x - r.x;
	       offset.y = p.y - r.y;
	       component.draggingIMG2 = true;
       }

    }

    public void mouseReleased(MouseEvent e) {
	component.draggingIMG1 = component.draggingIMG2 = false;
    }

    public void mouseDragged(MouseEvent e) {
       if(component.draggingIMG1) {
           int x = e.getX() - offset.x;
           int y = e.getY() - offset.y;
           component.setRect(x, y);
       }
       else if(component.draggingIMG2) {
           int x = e.getX() - offset.x;
           int y = e.getY() - offset.y;
           component.setRect(x, y);
       }
    }
}

LianaN 0 Posting Whiz in Training · Answer 4 · 2010-12-20T03:47:16+00:00

Thank you very much! I updated my code based on your comments.

class ImageRectangle extends Rectangle {
         int a, b, c, d;
         BufferedImage bi;
         
         public ImageRectangle (int x, int y, int w, int h, BufferedImage bi) {
            super(x, y, w, h);
            this.a = x; this.b = y; this.c = w; this.d = h;
            this.bi = bi;
         }
         
         @Override
         public boolean contains(Point p) {
             return ((a <= x && x <= (a + c)) && (b <= y && y <= (b + d)));
         }
                    
         //public void drawImage(Graphics2D g2) {
         //   g2.draw(this);
         //} 
    }

But I still have problems with drawImage. Could you please help me to finish it or just give some links?

LianaN 0 Posting Whiz in Training · Answer 5 · 2010-12-20T04:07:46+00:00

I just posted a new reply, but I see that you already answered. So, let me try your proposal.

LianaN 0 Posting Whiz in Training · Answer 6 · 2010-12-20T04:34:07+00:00

Thank you very much! I suppose that the problem is almost solved. So,images can be dragged and dropped, but they:
1) move together;
2) move only along a diagonal.

I guess that IF...THEN should be added to GraphicDragController in order to check an image to be moved. But which "if condition" is better to use? Should I use some boolean variable?

import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.event.MouseInputAdapter;

public class Drag1 extends JPanel {
    ImageRectangle img1;
    ImageRectangle img2;

    boolean draggingIMG1, draggingIMG2 = false;

    public Drag1() {
        try {
            Image image1 = ImageIO.read(getClass().getResource("hand_cursor.gif"));
            BufferedImage bi1 = new BufferedImage(image1.getWidth(this), image1.getHeight(this),
            BufferedImage.TYPE_INT_ARGB);
            Graphics2D big = bi1.createGraphics();
            big.drawImage(image1, 0, 0, this);
            img1 = new ImageRectangle(10, 100, bi1.getWidth(), bi1.getHeight(), bi1);

            Image image2 = ImageIO.read(getClass().getResource("hand_cursor.gif"));
            BufferedImage bi2 = new BufferedImage(image2.getWidth(this), image2.getHeight(this),
            BufferedImage.TYPE_INT_ARGB);
            Graphics2D big2 = bi2.createGraphics();
            big2.drawImage(image2, 0, 0, this);
            img2 = new ImageRectangle(100, 100, bi1.getWidth(), bi1.getHeight(), bi2);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);
        img1.drawImage(g2);
        img2.drawImage(g2);
    }

    public static void main(String[] args) {
        Drag1 test = new Drag1();
        new GraphicDragController(test);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(test);
        f.setSize(400,400);
        f.setLocation(100,100);
        f.setVisible(true);
    }
}

    class GraphicDragController extends MouseInputAdapter {
      Drag1 component;

      public GraphicDragController(Drag1 gdad) {
          component = gdad;
          component.addMouseListener(this);
          component.addMouseMotionListener(this);
      }

      public void mousePressed(MouseEvent e) {
      Point p = e.getPoint();
          component.img1.mousePressed(p);
          component.img2.mousePressed(p);
          component.repaint();
      }

      public void mouseReleased(MouseEvent e) {
          component.img1.mouseReleased();
          component.img2.mouseReleased();
          component.repaint();
      }

      public void mouseDragged(MouseEvent e) {
          Point p = e.getPoint();
          component.img1.mouseDragged(p);
          component.img2.mouseDragged(p);
          component.repaint();
      }
    }

    class ImageRectangle extends Rectangle {
         BufferedImage bi;
         Point offset = new Point();

         public ImageRectangle (int x, int y, int w, int h, BufferedImage bi) {
            super(x, y, w, h);
            this.bi = bi;
         }

         @Override
         public boolean contains(Point p) {
             return super.contains(p);
         }

         public void drawImage(Graphics2D g2) {
             g2.drawImage(bi, x, y, null);
         }

         void mouseDragged(Point p) {
            x = p.y - offset.x;
            y = p.y - offset.y;;
         }

         void mouseReleased() {

         }

         void mousePressed(Point p) {
            offset.x = p.x - x;
            offset.y = p.y - y;
         }
    }

LianaN 0 Posting Whiz in Training · Answer 7 · 2010-12-20T19:01:07+00:00

LianaN 0 Posting Whiz in Training

13 Years Ago

Thank you once again!!!

chanduslyfe 0 Newbie Poster · Answer 8 · 2021-01-08T07:28:22+00:00

Hello friend, The above code end up with the following exception.

`Exception in thread "main" java.lang.IllegalArgumentException: input == null!
at java.desktop/javax.imageio.ImageIO.read(ImageIO.java:1400)
at Drag1.<init>(Drag1.java:29)
at Drag1.main(Drag1.java:58)`

Please help me to clear this exception.

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.MouseInputAdapter;

public class Drag1 extends JPanel {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    ImageRectangle img1;
    ImageRectangle img2;

    boolean draggingIMG1, draggingIMG2 = false;

    public Drag1() {
        int a=10;
        try {
            Image image1 = ImageIO.read(getClass().getResource("C:\\Users\\Karikkuzhy_Veedu\\Pictures\\Saved Pictures\\me1.jpg"));
            BufferedImage bi1 = new BufferedImage(image1.getWidth(this), image1.getHeight(this),
            BufferedImage.TYPE_INT_ARGB);
            Graphics2D big = bi1.createGraphics();
            big.drawImage(image1, 0, 0, this);
            img1 = new ImageRectangle(10, 100, bi1.getWidth(), bi1.getHeight(), bi1);

            Image image2 = ImageIO.read(getClass().getResource("me1.jpg"));
            BufferedImage bi2 = new BufferedImage(image2.getWidth(this), image2.getHeight(this),
            BufferedImage.TYPE_INT_ARGB);
            Graphics2D big2 = bi2.createGraphics();
            big2.drawImage(image2, 0, 0, this);
            img2 = new ImageRectangle(100, 100, bi1.getWidth(), bi1.getHeight(), bi2);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);
        img1.drawImage(g2);
        img2.drawImage(g2);
    }

    public static void main(String[] args) {
        Drag1 test = new Drag1();
        new GraphicDragController(test);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(test);
        f.setSize(400,400);
        f.setLocation(100,100);
        f.setVisible(true);
    }
}

    class GraphicDragController extends MouseInputAdapter {
      Drag1 component;

      public GraphicDragController(Drag1 gdad) {
          component = gdad;
          component.addMouseListener(this);
          component.addMouseMotionListener(this);
      }

      public void mousePressed(MouseEvent e) {
      Point p = e.getPoint();
          component.img1.mousePressed(p);
          component.img2.mousePressed(p);
          component.repaint();
      }

      public void mouseReleased(MouseEvent e) {
          component.img1.mouseReleased();
          component.img2.mouseReleased();
          component.repaint();
      }

      public void mouseDragged(MouseEvent e) {
          Point p = e.getPoint();
          component.img1.mouseDragged(p);
          component.img2.mouseDragged(p);
          component.repaint();
      }
    }

    class ImageRectangle extends Rectangle {
         /**
         * 
         */
        private static final long serialVersionUID = 1L;
        BufferedImage bi;
         Point offset = new Point();

         public ImageRectangle (int x, int y, int w, int h, BufferedImage bi) {
            super(x, y, w, h);
            this.bi = bi;
         }

         @Override
         public boolean contains(Point p) {
             return super.contains(p);
         }

         public void drawImage(Graphics2D g2) {
             g2.drawImage(bi, x, y, null);
         }

         void mouseDragged(Point p) {
            x = p.y - offset.x;
            y = p.y - offset.y;;
         }

         void mouseReleased() {

         }

         void mousePressed(Point p) {
            offset.x = p.x - x;
            offset.y = p.y - y;
         }
    }

JamesCherrill 4,733 Most Valuable Poster Team Colleague Featured Poster · Answer 9 · 2021-01-08T08:52:28+00:00

It looks like the file named on line 29 doesn't exist, or is in some incompaible format.

Check out the Oracle documentation at https://docs.oracle.com/javase/8/docs/technotes/guides/lang/resources.html

in particular red the section headed "Resources, names, and contexts"

Thank you for this post. I was just looking for something like this. With a few corrections and additions it workes as expected.

java_marvin 0 Newbie Poster · Answer 10 · 2022-02-18T20:38:19+00:00

Hi, I was just looking for nearly this code. Thank's for the work. But there had been a few copy-paste exceptions in the code above.
Like [x = p.y - offset.x] in the method mouseDragged. It has to be [x = p.x - offset.x] for example.

The following code works out of the box if you extend the lines 'ImageIO.read . . .' with real Image-Paths from your filesystem.

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.MouseInputAdapter;

public class Drag1 extends JPanel {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public ImageRectangle img1;
    public ImageRectangle img2;

    public boolean draggingIMG1 = false;
    public boolean draggingIMG2 = false;

    public Drag1() {
        int a = 10;
        try {

            Image image1 = ImageIO.read(new File("C:\\ . . . image1.png"));
            BufferedImage bi1 = new BufferedImage(image1.getWidth(this), image1.getHeight(this), BufferedImage.TYPE_INT_ARGB);
            Graphics2D big = bi1.createGraphics();
            big.drawImage(image1, 0, 0, this);
            img1 = new ImageRectangle(0, 0, bi1.getWidth(), bi1.getHeight(), bi1);

            Image image2 = ImageIO.read(new File("C:\\. . . image2.png"));
            BufferedImage bi2 = new BufferedImage(image2.getWidth(this), image2.getHeight(this), BufferedImage.TYPE_INT_ARGB);
            Graphics2D big2 = bi2.createGraphics();         
            big2.drawImage(image2, 0, 0, this);
            img2 = new ImageRectangle(100, 100, bi2.getWidth(), bi2.getHeight(), bi2);

        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        img1.drawImage(g2);
        img2.drawImage(g2);
    }

    public static void main(String[] args) {
        Drag1 test = new Drag1();
        new GraphicDragController(test);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(test);
        f.setSize(400, 400);
        f.setLocation(100, 100);
        f.setVisible(true);
    }
}

class GraphicDragController extends MouseInputAdapter {
    Drag1 component;

    public GraphicDragController(Drag1 gdad) {
        component = gdad;
        component.addMouseListener(this);
        component.addMouseMotionListener(this);
    }

    public void mousePressed(MouseEvent e) {
        Point p = e.getPoint();
        System.out.println("mousePressed: " + p.toString());

        if (p.getX() >= component.img1.x && 
            p.getY() >= component.img1.y && 
            p.getX() <= (component.img1.x + component.img1.width) && 
            p.getY() <= (component.img1.y + component.img1.height)) {
            component.img1.mousePressed(p);
            component.draggingIMG1 = true;
        } else {
            component.draggingIMG1 = false;
        }       

        if (p.getX() >= component.img2.x && 
            p.getY() >= component.img2.y && 
            p.getX() <= (component.img2.x + component.img2.width) &&
            p.getY() <= (component.img2.y + component.img2.height)) { 
            component.img2.mousePressed(p);
            component.draggingIMG2 = true;
        } else {
            component.draggingIMG2 = false;
        }

        component.repaint();
    }

    public void mouseReleased(MouseEvent e) {
        System.out.println("mouseReleased: ");

        if (component.draggingIMG1) {
            component.img1.mouseReleased();
            component.draggingIMG1 = false;
        }       
        if (component.draggingIMG2) {
            component.img2.mouseReleased();
            component.draggingIMG2 = false;
        }
        component.repaint();
    }

    public void mouseDragged(MouseEvent e) {
        Point p = e.getPoint();
        System.out.println("mouseDragged: " + p.toString());

        if (component.draggingIMG1) {
            component.img1.mouseDragged(p);
        }

        if (component.draggingIMG2) {
            component.img2.mouseDragged(p);
        }
        component.repaint();
    }
}

class ImageRectangle extends Rectangle {
    /**
    * 
    */
    private static final long serialVersionUID = 1L;
    BufferedImage bi;
    Point offset = new Point();

    public ImageRectangle(int x, int y, int w, int h, BufferedImage bi) {
        super(x, y, w, h);
        this.bi = bi;
    }

    @Override
    public boolean contains(Point p) {
        return super.contains(p);
    }

    public void drawImage(Graphics2D g2) {
        g2.drawImage(bi, x, y, null);
    }

    void mouseDragged(Point p) {
        x = p.x - offset.x;
        y = p.y - offset.y;
    }

    void mouseReleased() {

    }

    void mousePressed(Point p) {
        offset.x = p.x - x;
        offset.y = p.y - y;
    }
}

ivy.inc.Hugh 0 Newbie Poster · Answer 11 · 2022-02-26T06:10:24+00:00

I think you must use ImageInputStream first.
Don't notice that ,it's only my sily answer.

ivy.inc.Hugh 0 Newbie Poster · Answer 12 · 2022-02-26T06:16:46+00:00

I think you can use ImageReadParam this class ,too;
You can load Pixels one by one ,and use Graphics draw... a pixel one by one;

Adding multiple images to JPanel for dragging and dropping purposes

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