java - 编码风险(游戏): Making buttons shape of territories

Question

我正在为学校的一个项目用 Java 编写棋盘游戏 Risk。我需要让每个地区成为一个单独的按钮。我将每个区域分成具有透明背景的不同图片。我知道 2D java 按钮是面向矩形的，所以我可能不得不使用 alpha 值，因为我已经为每个区域的背景提供了透明背景。

如果我这样做，会出现两个问题:

1. 我不知道按钮的透明区域是否被按下。
2. 按钮由于其固有的矩形形状而重叠，我只需要包含被单击的非透明像素的按钮即可启动。

或者是否有更有效的方法来编写游戏代码？欢迎任何帮助，因为这是非常需要的。我在网上找到了java版的 table 游，但是看不懂。 (它被标记为统治，但实际上是风险。 Link to the map || The link to the game I found online

Answer 1

这是我制作的东西，您可以继续使用它来仅在没有透明度的区域上感知运动。

IMAGEBUTTON.java 就像 JButton 一样工作，除了你给它一个 imageIcon 并且它感知 alpha 提供的类

如果你有任何来自 png 的阴影，请使用 setMinimumDetectionAlpha()。

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;

@SuppressWarnings("serial")
public class ImageButton extends javax.swing.JButton implements MouseListener{

private MouseListener mouseListener = null;
private BufferedImage bufferedImage;
private int minAlpha = 0x0;
private boolean userMouseListener = false;

public ImageButton(ImageIcon ic){
    super();
    setPreferredSize(new Dimension(ic.getIconWidth(), ic.getIconHeight()));
    setImage(ic);
    addMouseListener(this);
}
protected BufferedImage imageIconToBufferedImage(ImageIcon a){
    BufferedImage bi = new BufferedImage(a.getIconWidth(), a.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
    Graphics2D g2d = (Graphics2D) bi.getGraphics();
    g2d.drawImage(a.getImage(), 0,0,null);
    g2d.dispose();
    return bi;
}
public void setImage(ImageIcon ic){
    bufferedImage = imageIconToBufferedImage(ic);
    repaint();
}
protected void paintComponent(Graphics g){
    Graphics2D g2d = (Graphics2D) g;
    RenderingHints _rh = g2d.getRenderingHints();
    g2d.setRenderingHint(
            RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2d.drawImage(bufferedImage, 0, 0, null);
    g2d.setRenderingHints(_rh);
}
protected void setMinimumDetectionAlpha(int alpha){
    minAlpha = alpha == 0 ? 1 : alpha;
    minAlpha =  minAlpha % 0x000000FF << 0x00000010;
}
protected void processMouseEvent(MouseEvent e) {
    if(checkInBounds(e.getX(), e.getY())){
        switch(e.getID()){
            case MouseEvent.MOUSE_CLICKED:  mouseListener.mouseClicked(e);      break;
            case MouseEvent.MOUSE_ENTERED:  mouseListener.mouseEntered(e);      break;
            case MouseEvent.MOUSE_EXITED:   mouseListener.mouseExited(e);       break;
            case MouseEvent.MOUSE_PRESSED:  mouseListener.mousePressed(e);      break;
            case MouseEvent.MOUSE_RELEASED: mouseListener.mouseReleased(e);     break;
        }           
        e.consume();            
    }
}
public void addMouseListener(MouseListener a){
    if(!userMouseListener)
        super.addMouseListener(a);
    else
        mouseListener = a;
    userMouseListener = true;       
}
protected boolean checkInBounds(int x, int y){
    try{        
        if((bufferedImage.getRGB(x, y) & 0xFF000000)>>>4 >= (minAlpha > 0 ? minAlpha : 0x08800000))
            return true;
        else
            throw new Exception();
    }catch(Exception e){
        return false;
    }
}
@Override
public void mouseClicked(MouseEvent e)  {       processMouseEvent(e);       }
@Override
public void mouseEntered(MouseEvent e)  {       processMouseEvent(e);       }
@Override
public void mouseExited(MouseEvent e)   {       processMouseEvent(e);       }
@Override
public void mousePressed(MouseEvent e)  {       processMouseEvent(e);       }
@Override
public void mouseReleased(MouseEvent e) {       processMouseEvent(e);   }
}

你可以像这样继续使用它

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.ImageIcon;
import javax.swing.JFrame;


public class Test {

/**
 * @param args
 */
public static void main(String[] args) {
    JFrame jmb = new JFrame();
    ImageButton ib = new ImageButton(new ImageIcon("res/buttonImage.png"));
    ib.setMinimumDetectionAlpha(0);
    ib.addMouseListener(new MouseListener(){

        @Override
        public void mouseClicked(MouseEvent e) {
            System.out.println("eventFired");       

        }

        @Override
        public void mouseEntered(MouseEvent e) {
            System.out.println("eventFired");       

        }

        @Override
        public void mouseExited(MouseEvent e) {
            System.out.println("eventFired");       

        }

        @Override
        public void mousePressed(MouseEvent e) {
            System.out.println("eventFired");       

        }

        @Override
        public void mouseReleased(MouseEvent e) {
            System.out.println("eventFired");       

        }

    });
    jmb.add(ib);
    jmb.pack();
    jmb.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jmb.show();
}

}

使用的图像是这样的

希望对你有帮助:D