Tips regarding how to create an Java Solitaire game

I got some question regarding 开发者_如何转开发the approach to create an solitaire game in java.

What is the best way of handling the cards in Swing? How can I drag them, and what is the best way to snap them into their right positions?

what is the best way to snap them into their right positions?

The Overlap Layout might help you with this.

What would be the best approach for dragging multiple images? I've come as far as using Java2D to draw two images to a JPanel, but I'm only able to drag one of them. I'll attach my source code. The problem with my solution is that I need to repaint the entire window even though I'm just manipulating one element. Is it possible to handle objects of cards, instead of images of them? So when I move one card, I'll move the visual presentation of the object, instead of a image (as I do now.)

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.image.BufferedImage;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Java2d_MainPanel extends JPanel{
    private static BufferedImage img = new logic.GetBufferedImage().getImage();
    private JButton knapp = new JButton("Nytt bilde");
    private JButton knapp2 = new JButton("Nytt bilde2");
    private static BufferedImage img2 = new logic.GetBufferedImage().getImage2();
    //coordinates for image 1
    private int x1 = 0; 
    private int y1 = 0;
    //coordinates for image 2
    private int x2 = 50;
    private int y2 = 50;

public Java2d_MainPanel(){
    add(knapp);
    add(knapp2);
    knapp.addActionListener(new ButtonHandler());
    knapp2.addActionListener(new ButtonHandler2());
    addMouseMotionListener(new MouseMotionHandler());
}

public void newImage(ActionEvent e){
    if(e.getSource().equals(knapp)){
    img = new logic.GetBufferedImage().getImage();
    repaint();
    }
    else if(e.getSource().equals(knapp2)){
    img2 = new logic.GetBufferedImage().getImage2();
    repaint();
    }
}
@Override
public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    newPaint(g2d);
}
public void newPaint(Graphics2D g2d){
    g2d.drawImage(img, x1, y1, null);
    g2d.drawImage(img2, x2, y2,null);
}

public static void main(String[] args) {

    JFrame frame = new JFrame("Rabbits");
    frame.add(new Java2d_MainPanel());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(800, 640);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
}
class MouseMotionHandler extends MouseMotionAdapter {
    @Override
public void mouseDragged(MouseEvent e) {

  x1 = e.getX()-(img.getWidth()/2);
  y1 = e.getY()-(img.getHeight()/2);
  repaint();
}
}
class ButtonHandler implements ActionListener{

    public void actionPerformed(ActionEvent e) {
        newImage(e);
    }

  }
 class ButtonHandler2 implements ActionListener{

    public void actionPerformed(ActionEvent e) {
        newImage(e);
    }

 }
}