import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class FontSizeAnimation extends JPanel implements ActionListener {
Timer timer;
int x = 1;
float alpha = 1;
public FontSizeAnimation() {
timer = new Timer(8, this);
timer.setInitialDelay(190);
timer.start();
}
public void paint(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
Font font = new Font("Dialog", Font.PLAIN, x);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
String s = "Java";
int w = (int) getSize().getWidth();
int h = (int) getSize().getHeight();
int stringWidth = fm.stringWidth(s);
g2d.drawString(s, (w - stringWidth) / 2, h / 2);
}
public static void main(String[] args) {
JFrame frame = new JFrame("FontSizeAnimation");
frame.add(new FontSizeAnimation());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
x += 1;
alpha -= 0.0001;
repaint();
}
}
|
