package untitled1;
/*
* @(#)ImageOps.java 1.2 98/07/09
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.image.*;
import java.awt.geom.AffineTransform;
import java.awt.font.TextLayout;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.awt.event.WindowAdapter;
import java.net.URL;
public class ImageOps extends JApplet {
private BufferedImage bi[];
public static final float[] SHARPEN3x3_3 = {
0.f, -1.f, 0.f,
-1.f, 5.f, -1.f,
0.f, -1.f, 0.f};
public void init() {
setBackground(Color.white);
bi = new BufferedImage[4];
String s[] = { "bld.jpg", "bld.jpg", "boat.gif", "boat.gif"};
for ( int i = 0;
i < bi.length;
i++ ) {
Image img = getImage(getURL("images/" + s));
try {
MediaTracker tracker = new MediaTracker(this);
tracker.addImage(img, 0);
tracker.waitForID(0);
}
catch ( Exception e ) {}
int iw = img.getWidth(this);
int ih = img.getHeight(this);
bi = new BufferedImage(iw, ih, BufferedImage.TYPE_INT_RGB);
Graphics2D big = bi.createGraphics();
big.drawImage(img,0,0,this);
}
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
int w = getSize().width;
int h = getSize().height;
g2.setColor(Color.black);
float[][] data = {{0.1f, 0.1f, 0.1f, // low-pass filter
0.1f, 0.2f, 0.1f,
0.1f, 0.1f, 0.1f},
SHARPEN3x3_3};
String theDesc[] = { "Convolve LowPass", "Convolve Sharpen",
"LookupOp", "RescaleOp"};
for ( int i = 0;
i < bi.length;
i++ ) {
int iw = bi.getWidth(this);
int ih = bi.getHeight(this);
int x = 0, y = 0;
AffineTransform at = new AffineTransform();
at.scale((w-14)/2.0/iw, (h-34)/2.0/ih);
BufferedImageOp biop = null;
BufferedImage bimg = new BufferedImage(iw,ih,BufferedImage.TYPE_INT_RGB);
switch ( i ) {
case 0 :
case 1 : x = i==0?5:w/2+3;
y = 15;
Kernel kernel = new Kernel(3,3,data);
ConvolveOp cop = new ConvolveOp(kernel,
ConvolveOp.EDGE_NO_OP,
null);
cop.filter(bi,bimg);
biop = new AffineTransformOp(at,
AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
break;
case 2 : x = 5;
y = h/2+15;
byte chlut[] = new byte[256];
for ( int j=0;j<200 ;j++ )
chlut[j]=(byte)(256-j);
ByteLookupTable blut=new ByteLookupTable(0,chlut);
LookupOp lop = new LookupOp(blut, null);
lop.filter(bi,bimg);
biop = new AffineTransformOp(at,
AffineTransformOp.TYPE_BILINEAR);
break;
case 3 : x = w/2+3;
y = h/2+15;
RescaleOp rop = new RescaleOp(1.1f,20.0f, null);
rop.filter(bi,bimg);
biop = new AffineTransformOp(at,
AffineTransformOp.TYPE_BILINEAR);
}
g2.drawImage(bimg,biop,x,y);
TextLayout tl = new TextLayout(theDesc, g2.getFont(),g2.getFontRenderContext());
tl.draw(g2, (float) x, (float) y-4);
}
}
protected URL getURL(String filename) {
URL codeBase = this.getCodeBase();
URL url = null;
try {
url = new URL(codeBase, filename);
} catch (java.net.MalformedURLException e) {
System.out.println("Couldn't create image: "
+ "badly specified URL");
return null;
}
return url;
}
public static void main(String s[]) {
JFrame f = new JFrame("ImageOps");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
JApplet applet = new ImageOps();
f.getContentPane().add("Center", applet);
applet.init();
f.pack();
f.setSize(new Dimension(550,550));
f.show();
}
}
from http://java.sun.com/docs/books/tutorial/2d/images/doublebuffering.html
