PixelGrabber: grabPixels()
// This example is from the book _Java AWT Reference_ by John Zukowski.
// Written by John Zukowski. Copyright (c) 1997 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.image.ImageObserver;
import java.awt.image.MemoryImageSource;
import java.awt.image.PixelGrabber;
public class MainClass extends Applet {
Image i, j, k, l;
public void init() {
MediaTracker mt = new MediaTracker(this);
i = getImage(getDocumentBase(), "ora-icon.gif");
mt.addImage(i, 0);
try {
mt.waitForAll();
int width = i.getWidth(this);
int height = i.getHeight(this);
int pixels[] = new int[width * height];
PixelGrabber pg = new PixelGrabber(i, 0, 0, width, height, pixels, 0, width);
if (pg.grabPixels() && ((pg.status() & ImageObserver.ALLBITS) != 0)) {
j = createImage(new MemoryImageSource(width, height, rowFlipPixels(pixels, width, height),
0, width));
k = createImage(new MemoryImageSource(width, height, colFlipPixels(pixels, width, height),
0, width));
l = createImage(new MemoryImageSource(height, width, rot90Pixels(pixels, width, height), 0,
height));
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public void paint(Graphics g) {
g.drawImage(i, 10, 10, this); // regular
if (j != null)
g.drawImage(j, 150, 10, this); // rowFlip
if (k != null)
g.drawImage(k, 10, 60, this); // colFlip
if (l != null)
g.drawImage(l, 150, 60, this); // rot90
}
private int[] rowFlipPixels(int pixels[], int width, int height) {
int newPixels[] = null;
if ((width * height) == pixels.length) {
newPixels = new int[width * height];
int newIndex = 0;
for (int y = height - 1; y >= 0; y--)
for (int x = width - 1; x >= 0; x--)
newPixels[newIndex++] = pixels[y * width + x];
}
return newPixels;
}
private int[] colFlipPixels(int pixels[], int width, int height) {
int newPixels[] = null;
if ((width * height) == pixels.length) {
newPixels = new int[width * height];
int newIndex = 0;
for (int y = 0; y < height; y++)
for (int x = width - 1; x >= 0; x--)
newPixels[newIndex++] = pixels[y * width + x];
}
return newPixels;
}
private int[] rot90Pixels(int pixels[], int width, int height) {
int newPixels[] = null;
if ((width * height) == pixels.length) {
newPixels = new int[width * height];
int newIndex = 0;
for (int x = width - 1; x >= 0; x--)
for (int y = 0; y < height; y++)
newPixels[newIndex++] = pixels[y * width + x];
}
return newPixels;
}
}
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