BufferedAnimate.java Source code

Introduction

Here is the source code for BufferedAnimate.java

Source

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();
    }
}