[英]Drawing an oval on top of JButton
所以基本上我想創建一個反向游戲。 首先,我創建了一個由按鈕填充的面板,並為其附加了ID,因此以后可以根據需要對其進行訪問。 現在,我試圖在每個按鈕上繪制一個游戲塊,但是我無法獲取按鈕的Graphics(),因為我讀到這是一個壞主意,並且還返回null。 請記住,由於我使用MVC模式進行開發,因此我想將所有實體分開:板,單元和零件。
board.java
import java.awt.GridLayout;
import javax.swing.JPanel;
public class Board extends JPanel {
private static final int sizeOfBoard = 8;
public Board() {
int id =0;
setLayout(new GridLayout(sizeOfBoard,sizeOfBoard));
for (int i = 0; i < sizeOfBoard; i++) {
for (int j = 0; j < sizeOfBoard; j++) {
Cell cell = new Cell(id++);
Disk disk = new Disk();
cell.add(disk);
add(cell);
}
}
setSize(600,500);
setVisible(true);
}
cell.java
import java.awt.Graphics;
import javax.swing.JButton;
import javax.swing.Painter;
public class Cell extends JButton{
private int id;
private boolean taken;
private String colour;
private Painter painter;
public Cell(int id){
this.id = id;
}
public int getId(){
return id;
}
@Override
public void paintComponent(Graphics g){
super.paintComponent(g);
}
}
disk.java
import java.awt.Graphics;
import javax.swing.JComponent;
public class Disk extends JComponent{
@Override
public void paintComponent ( Graphics g ) {
super.paintComponent(g);
g.drawOval(50,50,50,50);
}
}
TL; DR我應該如何重寫代碼,以便每個按鈕上都有一個橢圓形。
提前致謝。
最簡單的解決方案:在BufferedImage中創建橢圓形或磁盤圖像,將其放入ImageIcon中,然后通過其setIcon(myIcon)
方法在JButton或JLabel上交換圖標。 如果這是我的GUI,我將創建3個ImageIcons,一個空白的用於初始狀態,然后兩個不同的彩色用於占領狀態。
例如:
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.RenderingHints;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import javax.swing.*;
@SuppressWarnings("serial")
public class ReversiPanel extends JPanel {
private static final int SIDES = 8;
private static final int ICON_LENGTH = 60;
private static final Color BG = Color.BLACK;
private static final Color LABEL_COLOR = Color.GREEN.darker();
private JLabel[][] labelGrid = new JLabel[SIDES][SIDES];
private Icon blankIcon;
private Icon blackIcon;
private Icon whiteIcon;
public ReversiPanel() {
blankIcon = createIcon(new Color(0, 0, 0, 0));
blackIcon = createIcon(Color.BLACK);
whiteIcon = createIcon(Color.WHITE);
setBackground(BG);
setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
setLayout(new GridLayout(SIDES, SIDES, 1, 1));
MyMouse myMouse = new MyMouse();
for (int i = 0; i < labelGrid.length; i++) {
for (int j = 0; j < labelGrid[i].length; j++) {
JLabel label = new JLabel(blankIcon);
label.setOpaque(true);
label.setBackground(LABEL_COLOR);
label.addMouseListener(myMouse);
labelGrid[i][j] = label;
add(label);
}
}
}
private Icon createIcon(Color color) {
BufferedImage img = new BufferedImage(ICON_LENGTH, ICON_LENGTH, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(color);
int gap = 4;
int w = ICON_LENGTH - 2 * gap;
int h = w;
g2.fillOval(gap, gap, w, h);
g2.dispose();
return new ImageIcon(img);
}
private class MyMouse extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
JLabel label = (JLabel) e.getSource();
Icon icon = label.getIcon();
if (icon == blankIcon) {
label.setIcon(blackIcon);
} else if (icon == blackIcon) {
label.setIcon(whiteIcon);
} else {
label.setIcon(blankIcon);
}
}
}
private static void createAndShowGui() {
ReversiPanel mainPanel = new ReversiPanel();
JFrame frame = new JFrame("ReversiPanel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
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