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import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Insets;
import java.awt.image.BufferedImage;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JFrame;
public class BufferedAnimate extends JFrame {
private static int DELAY = 100;
Image buffer;
Dimension oldSize;
Insets insets;
Color colors[] = { Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN,
Color.BLUE, Color.MAGENTA };
public void paint(Graphics g) {
if ((oldSize == null) || (oldSize != getSize())) {
oldSize = getSize();
buffer = new BufferedImage(getWidth(), getHeight(),
BufferedImage.TYPE_INT_RGB);
}
if (insets == null) {
insets = getInsets();
}
// Calculate each time in case of resize
int x = insets.left;
int y = insets.top;
int width = getWidth() - insets.left - insets.right;
int height = getHeight() - insets.top - insets.bottom;
int start = 0;
int steps = colors.length;
int stepSize = 360 / steps;
synchronized (colors) {
Graphics bufferG = buffer.getGraphics();
bufferG.setColor(Color.WHITE);
bufferG.fillRect(x, y, width, height);
for (int i = 0; i < steps; i++) {
bufferG.setColor(colors[i]);
bufferG.fillArc(x, y, width, height, start, stepSize);
start += stepSize;
}
}
g.drawImage(buffer, 0, 0, this);
}
public void go() {
TimerTask task = new TimerTask() {
public void run() {
Color c = colors[0];
synchronized (colors) {
System.arraycopy(colors, 1, colors, 0, colors.length - 1);
colors[colors.length - 1] = c;
}
repaint();
}
};
Timer timer = new Timer();
timer.schedule(task, 0, DELAY);
}
public static void main(String args[]) {
BufferedAnimate f = new BufferedAnimate();
f.setSize(200, 200);
f.setTitle("Buffered");
f.show();
f.go();
}
}
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