空白部分阻止JFrame内部的绝对定位图形JPanel

Question

我正在尝试通过制作拼图程序来提高我对Java的理解,特别是Java GUI.目前,用户选择图像,该图像被切割成指定数量的片段.这些碎片被随机地绘制到屏幕上,但它们似乎被其他部分的空白部分覆盖,并不是所有部分都显示出来,但我可以打印出所有坐标.我使用绝对定位,因为LayoutManager似乎不起作用.我简单地试过了layeredPanes,但是他们让我困惑,似乎没有解决问题.我真的很感激一些帮助.
以下是2个相关课程:

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

public class PuzzlePieceDriver extends JFrame
{
  private static Dimension SCREENSIZE = Toolkit.getDefaultToolkit().getScreenSize();
  private static final int HEIGHT = SCREENSIZE.height;
  private static final int WIDTH = SCREENSIZE.width;

  public static int MY_WIDTH;
  public static int MY_HEIGHT;

  private static BufferedImage image;


  private int xPieces = PuzzleMagicDriver.getXPieces();
  private int yPieces = PuzzleMagicDriver.getYPieces();

  private PuzzlePiece[] puzzle = new PuzzlePiece[xPieces*yPieces];

  public Container pane = this.getContentPane();
  private JLayeredPane layeredPane = new JLayeredPane();


  public PuzzlePieceDriver(ImageIcon myPuzzleImage)
  {
    MY_WIDTH = myPuzzleImage.getIconWidth()+(int)myPuzzleImage.getIconHeight()/2;
    MY_HEIGHT = myPuzzleImage.getIconHeight()+(int)myPuzzleImage.getIconHeight()/2;
    setTitle("Hot Puzz");
setSize(MY_WIDTH,MY_HEIGHT);
setLocationByPlatform(true);

pane.setLayout(null);


image = iconToImage(myPuzzleImage); //pass image into bufferedImage form

puzzle = createClip(image);

//pane.add(layeredPane);


setVisible(true);
  }//end constructor



  public static BufferedImage iconToImage(ImageIcon icon)
  {
    Image img = icon.getImage();
 int w = img.getWidth(null);
 int h = img.getHeight(null);
 BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
 Graphics g = image.createGraphics();
     // Paint the image onto the buffered image
    g.drawImage(img, 0, 0, null);
    g.dispose();

    return image;
  }//end BufferedImage

  protected int randomNumber(int min, int max)
  {
    int temp = 
    min + (int)(Math.random() * ((max - min) + 1));

 return temp;
  }//end randomNumber


  private PuzzlePiece[] createClip(BufferedImage passedImage)
  {

 int cw, ch;
 int w,h;
 w = image.getWidth(null);
 h = image.getHeight(null);
 cw = w/xPieces;
     ch = h/yPieces;

 int[] cells=new int[xPieces*yPieces];

 int dx, dy;

 BufferedImage clip = passedImage;

 //layeredPane.setPreferredSize(new Dimension(w,h));

    for (int x=0; x<xPieces; x++) 
      {
        int sx = x*cw;
        for (int y=0; y<yPieces; y++) 
            {
            int sy = y*ch;
            int cell = cells[x*xPieces+y];
            dx = (cell / xPieces) * cw;
            dy = (cell % yPieces) * ch;

            clip= passedImage.getSubimage(sx, sy, cw, ch);
    int myX = randomNumber(0,(int)w);
    int myY = randomNumber(0,(int)h);

    PuzzlePiece piece=new PuzzlePiece(clip,myX,myY);
    puzzle[x*xPieces+y]=piece;
    piece.setBounds(myX,myY,w,h);
    //layeredPane.setBounds(myX,myY,w,h);
    //layeredPane.add(piece,new Integer(x*xPieces+y));
    pane.add(piece);
    piece.repaint();

        }//end nested for
}//end for
return puzzle;
  }//end createClip

}//end class

对不起,如果间距有点混乱!

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

public class PuzzlePiece extends JPanel
{
private Point imageCorner;      //the image's top-left corner location
private Point prevPt;               //mouse location for previous event
private Boolean insideImage =false;

private BufferedImage image;

public PuzzlePiece(BufferedImage clip, int x, int y)
{
 image = clip;
 imageCorner = new Point(x,y);
 //repaint();
}//end constructor

public void paintComponent(Graphics g)
{
     super.paintComponent(g);
 g.drawImage(image, (int)getImageCornerX(),(int)getImageCornerY(), this);
     System.out.println("paint "+getImageCornerX()+"   "+getImageCornerY());
    //repaint(); 
//g.dispose();
}//end paintComponent

public Point getImageCorner()
{
  return imageCorner;
}//end getImageCorner
public double getImageCornerY()
{
  return imageCorner.getY();
}//end getImageCornerY
public double getImageCornerX()
{
  return imageCorner.getX();
}//end getPoint


}//end class PuzzlePiece

任何帮助将不胜感激,我真的卡住了!谢谢!!

Answer 1

我对这个想法非常感兴趣,所以我使用自定义布局管理器做了另一个例子.

public class MyPuzzelBoard extends JPanel {

    public static final int GRID_X = 4;
    public static final int GRID_Y = 4;
    private BufferedImage image;

    public MyPuzzelBoard(BufferedImage image) {
        setLayout(new VirtualLayoutManager());
        setImage(image);

        addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if (e.getClickCount() == 2) {
                    removeAll();
                    generatePuzzel();
                } else {
                    Component comp = getComponentAt(e.getPoint());
                    if (comp != null && comp != MyPuzzelBoard.this) {
                        setComponentZOrder(comp, 0);
                        invalidate();
                        revalidate();
                        repaint();
                    }
                }
            }
        });
    }

    public void setImage(BufferedImage value) {
        if (value != image) {
            image = value;
            removeAll();
            generatePuzzel();
        }
    }

    public BufferedImage getImage() {
        return image;
    }

    protected float generateRandomNumber() {
        return (float) Math.random();
    }

    protected void generatePuzzel() {
        BufferedImage image = getImage();

        if (image != null) {
            int imageWidth = image.getWidth();
            int imageHeight = image.getHeight();

            int clipWidth = imageWidth / GRID_X;
            int clipHeight = imageHeight / GRID_Y;
            for (int x = 0; x < GRID_X; x++) {
                for (int y = 0; y < GRID_Y; y++) {

                    float xPos = generateRandomNumber();
                    float yPos = generateRandomNumber();
                    Rectangle bounds = new Rectangle((x * clipWidth), (y * clipHeight), clipWidth, clipHeight);
                    MyPiece piece = new MyPiece(image, bounds);
                    add(piece, new VirtualPoint(xPos, yPos));

                }
            }
        }

        invalidate();
        revalidate();
        repaint();
    }

    public class VirtualPoint {

        private float x;
        private float y;

        public VirtualPoint(float x, float y) {
            this.x = x;
            this.y = y;
        }

        public float getX() {
            return x;
        }

        public float getY() {
            return y;
        }

        public void setX(float x) {
            this.x = x;
        }

        public void setY(float y) {
            this.y = y;
        }
    }

    public class VirtualLayoutManager implements LayoutManager2 {

        private Map<Component, VirtualPoint> mapConstraints;

        public VirtualLayoutManager() {
            mapConstraints = new WeakHashMap<>(25);
        }

        @Override
        public void addLayoutComponent(Component comp, Object constraints) {
            if (constraints instanceof VirtualPoint) {
                mapConstraints.put(comp, (VirtualPoint) constraints);
            }
        }

        @Override
        public Dimension maximumLayoutSize(Container target) {
            return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
        }

        @Override
        public float getLayoutAlignmentX(Container target) {
            return 0.5f;
        }

        @Override
        public float getLayoutAlignmentY(Container target) {
            return 0.5f;
        }

        @Override
        public void invalidateLayout(Container target) {
        }

        @Override
        public void addLayoutComponent(String name, Component comp) {
        }

        @Override
        public void removeLayoutComponent(Component comp) {
            mapConstraints.remove(comp);
        }

        @Override
        public Dimension preferredLayoutSize(Container parent) {
            return new Dimension(400, 400);
        }

        @Override
        public Dimension minimumLayoutSize(Container parent) {
            return preferredLayoutSize(parent);
        }

        @Override
        public void layoutContainer(Container parent) {
            int width = parent.getWidth();
            int height = parent.getHeight();

            for (Component comp : parent.getComponents()) {

                VirtualPoint p = mapConstraints.get(comp);
                if (p != null) {

                    int x = Math.round(width * p.getX());
                    int y = Math.round(height * p.getY());

                    Dimension size = comp.getPreferredSize();

                    x = Math.min(x, width - size.width);
                    y = Math.min(y, height - size.height);

                    comp.setBounds(x, y, size.width, size.height);

                }
            }
        }
    }
}

基本上,这使用"虚拟"坐标系,而不是以像素为单位提供绝对x/y位置,您将它们作为父容器的百分比提供.现在,说实话,转换回绝对定位并不需要太多,就这样,你也可以进行布局缩放.

该示例还演示了Z-reording(以防万一),双击简单重新随机化了puzzel

哦,我也让这件作品透明(opaque = false)

哦,有一点我应该提一下,虽然通过这个例子,我发现有可能将部件放在屏幕外(完全和部分).

您可能需要检查您的定位代码,以确保布局后的图像没有移出屏幕;)