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import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ColorFadingAnimation extends JPanel {
private Rectangle2D rect = new Rectangle2D.Float(20f, 20f, 80f, 50f);
private float alpha_rectangle = 1f;
public ColorFadingAnimation() {
new RectRunnable();
}
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(new Color(50, 50, 50));
RenderingHints rh = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
rh.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHints(rh);
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha_rectangle));
g2d.fill(rect);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Color fading aniamtion");
frame.add(new ColorFadingAnimation());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(250, 150);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
class RectRunnable implements Runnable {
private Thread runner;
public RectRunnable() {
runner = new Thread(this);
runner.start();
}
public void run() {
while (alpha_rectangle >= 0) {
repaint();
alpha_rectangle += -0.01f;
if (alpha_rectangle < 0) {
alpha_rectangle = 0;
}
try {
Thread.sleep(50);
} catch (Exception e) {
}
}
}
}
}
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