我正在用 Java 制作游戏,并且正在使用JProgressBar
健康栏。我想为 . 使用图像(而不是颜色)JProgressBar
,但我无法做到。我尝试过使用paint方法,paintComponent
方法,创建一个新类,但它不起作用。有人可以帮助我吗?
问问题
1661 次
1 回答
6
无需创建自己的ProgressBarUI
实现,您可以简单地创建自己的......
这个例子本质上是用一个单一的药水图像制作一个“药水条”,然后根据当前进度渲染一个子图像。
让它只显示整个药水并不需要太多......
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.text.NumberFormat;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ProgressPane {
public static void main(String[] args) {
new ProgressPane();
}
public ProgressPane() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private float progress = 1f;
private BufferedImage potion;
private BufferedImage potionBar;
public TestPane() {
try {
potion = ImageIO.read(getClass().getResource("/Potion.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
setOpaque(false);
setForeground(Color.BLUE);
setBackground(Color.GRAY);
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
progress -= 0.01;
if (progress <= 0.001) {
((Timer) e.getSource()).stop();
}
repaint();
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
}
@Override
public void invalidate() {
super.invalidate();
potionBar = null;
}
@Override
public Dimension getPreferredSize() {
FontMetrics fm = getFontMetrics(getFont());
return new Dimension(200, Math.max(50, fm.getHeight() + 4));
}
protected void createPotionBar() {
if (potionBar == null) {
if (getWidth() > 0 && getHeight() > 0) {
FontMetrics fm = getFontMetrics(getFont());
int height = Math.max(50, fm.getHeight() + 4);
potionBar = new BufferedImage(getWidth() - 4, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = potionBar.createGraphics();
int x = 0;
int y = (height - potion.getHeight()) / 2;
while (x < getWidth() - 4) {
g2d.drawImage(potion, x, y, this);
x += potion.getWidth();
}
g2d.dispose();
}
}
}
@Override
protected void paintComponent(Graphics g) {
createPotionBar();
super.paintComponent(g);
int width = getWidth() - 4;
int height = getHeight() - 4;
int x = 2;
int y = 2;
g.setColor(getBackground());
g.fillRect(x, y, width, height);
g.setColor(Color.BLACK);
g.drawRect(x, y, width, height);
int progressWidth = (int) (width * progress);
BufferedImage progressImage = potionBar.getSubimage(0, 0, progressWidth, potionBar.getHeight());
g.drawImage(progressImage, x, y, this);
FontMetrics fm = g.getFontMetrics();
String value = NumberFormat.getPercentInstance().format(progress);
x = x + ((width - fm.stringWidth(value)) / 2);
y = y + ((height - fm.getHeight()) / 2);
g.setColor(Color.WHITE);
g.drawString(value, x, y + fm.getAscent());
}
}
}
于 2013-03-01T03:38:22.863 回答