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/**
* @version 1.10 1999-09-12
* @author Cay Horstmann
*/
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MandelbrotTest {
public static void main(String[] args) {
JFrame frame = new MandelbrotFrame();
frame.show();
}
}
class MandelbrotFrame extends JFrame {
public MandelbrotFrame() {
setTitle("MandelbrotTest");
setSize(400, 400);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = getContentPane();
contentPane.add(new MandelbrotPanel(), "Center");
}
}
class MandelbrotPanel extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
BufferedImage image = new BufferedImage(getWidth(), getHeight(),
BufferedImage.TYPE_INT_ARGB);
generate(image);
g.drawImage(image, 0, 0, null);
}
public void generate(BufferedImage image) {
int width = image.getWidth();
int height = image.getHeight();
WritableRaster raster = image.getRaster();
ColorModel model = image.getColorModel();
Color fractalColor = Color.red;
int argb = fractalColor.getRGB();
Object colorData = model.getDataElements(argb, null);
for (int i = 0; i < width; i++)
for (int j = 0; j < height; j++) {
double a = XMIN + i * (XMAX - XMIN) / width;
double b = YMIN + j * (YMAX - YMIN) / height;
if (!escapesToInfinity(a, b))
raster.setDataElements(i, j, colorData);
}
}
private boolean escapesToInfinity(double a, double b) {
double x = 0.0;
double y = 0.0;
int iterations = 0;
do {
double xnew = x * x - y * y + a;
double ynew = 2 * x * y + b;
x = xnew;
y = ynew;
iterations++;
if (iterations == MAX_ITERATIONS)
return false;
} while (x <= 2 && y <= 2);
return true;
}
private static final double XMIN = -2;
private static final double XMAX = 2;
private static final double YMIN = -2;
private static final double YMAX = 2;
private static final int MAX_ITERATIONS = 16;
}
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