/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
/**
* This program demonstrates how to build up an image from individual pixels.
* @version 1.13 2007-08-16
* @author Cay Horstmann
*/
public class RasterImageTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
JFrame frame = new RasterImageFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* This frame shows an image with a Mandelbrot set.
*/
class RasterImageFrame extends JFrame
{
public RasterImageFrame()
{
setTitle("RasterImageTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
BufferedImage image = makeMandelbrot(DEFAULT_WIDTH, DEFAULT_HEIGHT);
add(new JLabel(new ImageIcon(image)));
}
/**
* Makes the Mandelbrot image.
* @param width the width
* @parah height the height
* @return the image
*/
public BufferedImage makeMandelbrot(int width, int height)
{
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
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);
}
return image;
}
private boolean escapesToInfinity(double a, double b)
{
double x = 0.0;
double y = 0.0;
int iterations = 0;
while (x <= 2 && y <= 2 && iterations < MAX_ITERATIONS)
{
double xnew = x * x - y * y + a;
double ynew = 2 * x * y + b;
x = xnew;
y = ynew;
iterations++;
}
return x > 2 || y > 2;
}
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;
private static final int DEFAULT_WIDTH = 400;
private static final int DEFAULT_HEIGHT = 400;
}
|