分类： Java
2009-08-25 19:58:32
Creating a Buffered Image from an Array of Color-Indexed Pixel Values
(出自：http://www.exampledepot.com/egs/java.awt.image/Mandelbrot2.html)
This example demonstrates how to convert a byte array of pixel values that are indices to a color table into a BufferedImage. In particular, the example generates the Mandelbrot set in a byte buffer and combines this data with a SampleModel, ColorModel, and Raster into a BufferedImage. A 16-color index color model is used to represent the pixel colors.
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
// Instantiate this class and then use the draw() method to draw the
// generated on the graphics context.
public class Mandelbrot2 {
// Holds the generated image
Image image;
// 16-color model; this method is defined in
// e660 Creating an Image from an Array of Color-Indexed Pixel Values
ColorModel colorModel = generateColorModel();
public Mandelbrot2(int width, int height) {
// Initialize with default location
this(width, height, new Rectangle2D.Float(-2.0f, -1.2f, 3.2f, 2.4f));
}
public Mandelbrot2(int width, int height, Rectangle2D.Float loc) {
// Generate the pixel data; this method is defined in
// e660 Creating an Image from an Array of Color-Indexed Pixel Values
byte[] pixels = generatePixels(width, height, loc);
// Create a data buffer using the byte buffer of pixel data.
// The pixel data is not copied; the data buffer uses the byte buffer array.
DataBuffer dbuf = new DataBufferByte(pixels, width*height, 0);
// The number of banks should be 1
int numBanks = dbuf.getNumBanks(); // 1
// Prepare a sample model that specifies a storage 4-bits of
// pixel datavd in an 8-bit data element
int bitMasks[] = new int[]{(byte)0xf};
SampleModel sampleModel = new SinglePixelPackedSampleModel(
DataBuffer.TYPE_BYTE, width, height, bitMasks);
// Create a raster using the sample model and data buffer
WritableRaster raster = Raster.createWritableRaster(sampleModel, dbuf, null);
// Combine the color model and raster into a buffered image
image = new BufferedImage(colorModel, raster, false, null);//new java.util.Hashtable());
}
public void draw(Graphics g, int x, int y) {
g.drawImage(image, x, y, null);
}
}
Here's some code that uses the Mandelbrot2 class:
class RunMandelbrot2 {
static public void main(String[] args) {
new RunMandelbrot2();
}
RunMandelbrot2() {
Frame frame = new Frame("Mandelbrot2 Set");
frame.add(new MyCanvas());
frame.setSize(300, 200) ;
frame.setVisible(true);
}
class MyCanvas extends Canvas {
Mandelbrot2 mandelbrot;
MyCanvas() {
// Add a listener for resize events
addComponentListener(new ComponentAdapter() {
// This method is called when the component's size changes
public void componentResized(ComponentEvent evt) {
Component c = (Component)evt.getSource();
// Get new size
Dimension newSize = c.getSize();
// Regenerate the image
mandelbrot = new Mandelbrot2(newSize.width, newSize.height);
c.repaint();
}
});
}
public void paint(Graphics g) {
if (mandelbrot != null) {
mandelbrot.draw(g, 0, 0);
}
}
}
}
Noise Image
(出自：)
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.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.IndexColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.util.Random;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class StaticGenerator extends JComponent implements Runnable {
byte[] data;
BufferedImage image;
Random random;
public void initialize() {
int w = getSize().width, h = getSize().height;
int length = ((w + 7) * h) / 8;
data = new byte[length];
DataBuffer db = new DataBufferByte(data, length);
WritableRaster wr = Raster.createPackedRaster(db, w, h, 1, null);
ColorModel cm = new IndexColorModel(1, 2, new byte[] { (byte) 0, (byte) 255 }, new byte[] {
(byte) 0, (byte) 255 }, new byte[] { (byte) 0, (byte) 255 });
image = new BufferedImage(cm, wr, false, null);
random = new Random();
new Thread(this).start();
}
public void run() {
while (true) {
random.nextBytes(data);
repaint();
try {
Thread.sleep(1000 / 24);
} catch (InterruptedException e) { /* die */
}
}
}
public void paint(Graphics g) {
if (image == null)
initialize();
g.drawImage(image, 0, 0, this);
}
public static void main(String[] args) {
JFrame f = new JFrame();
f.add(new StaticGenerator());
f.setSize(300, 300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}