Hi,
I have a problem with painting a bufferedImage on the screen. The image is
simply created from an array of shorts that are used to create a
databuffer which together with a componentsamplemodel are used to create a
WritableRaster. This raster is then used with a colorcomponentmodel to
create the actual bufferedimage.
When i save the created image as a JPEG, it saves fine. i.e. all pixels
are correct. However when i try to display the image on the screen using
the paintComponent method, only one pixel is displayed - the one who's
value coressponds to the first element in the array of shorts.
Please Help!!
My code is below and is also attached:
Thanks
Raf
import java.awt.*;
import java.awt.color.*;
import java.awt.image.*;
import java.awt.image.renderable.ParameterBlock;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
import java.io.*;
import com.sun.image.codec.jpeg.*;
public class MakeImage extends JComponent {
BufferedImage bi = createGrayscaleImage(4, 4 , 1, new short[]
{0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1});
public BufferedImage createGrayscaleImage( int imageWidth, int
imageHeight, int imageDepth, short[] data) {
ComponentColorModel ccm = new ComponentColorModel(
ColorSpace.getInstance(
ColorSpace.CS_GRAY ),
new int[] {imageDepth},
false, false, Transparency.OPAQUE,
DataBuffer.TYPE_USHORT);
ComponentSampleModel csm = new ComponentSampleModel(
DataBuffer.TYPE_USHORT,
imageWidth, imageHeight, 1,
imageWidth, new int[] {0});
DataBuffer dataBuf = new DataBufferUShort( (short[])data,
imageWidth);
WritableRaster wr = Raster.createWritableRaster( csm, dataBuf,
null);
System.out.println(wr.getDataBuffer().getDataType());
Hashtable ht = new Hashtable();
ht.put( "owner", "Rafqat Aftab");
return new BufferedImage(ccm, wr, true, ht);
}
public void save() {
try {
ByteArrayOutputStream boutstream = new
ByteArrayOutputStream();
JPEGImageEncoder enc =
JPEGCodec.createJPEGEncoder(boutstream);
enc.encode(bi);
FileOutputStream fimage = new FileOutputStream(new
File("university-crest.jpg"));
boutstream.writeTo(fimage);
fimage.close();
} catch (Exception e) { System.out.println(e); }
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.drawRenderedImage(bi,null);
}
public static void main (String args[]) {
MakeImage c = new MakeImage();
c.save();
JFrame f = new JFrame();
f.getContentPane().setLayout(new FlowLayout());
f.setSize(1000,1000);
f.getContentPane().add(c);
f.pack();
f.show();
f.repaint();
}
}
Thanks
Raf
import java.awt.*;
import java.awt.color.*;
import java.awt.image.*;
import java.awt.image.renderable.ParameterBlock;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
import java.io.*;
import com.sun.image.codec.jpeg.*;
public class MakeImage extends JComponent {
BufferedImage bi = createGrayscaleImage(4, 4 , 1, new short[]
{0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1});
public BufferedImage createGrayscaleImage( int imageWidth, int imageHeight, int
imageDepth, short[] data) {
ComponentColorModel ccm = new ComponentColorModel(
ColorSpace.getInstance( ColorSpace.CS_GRAY ),
new int[] {imageDepth},
false, false, Transparency.OPAQUE,
DataBuffer.TYPE_USHORT);
ComponentSampleModel csm = new ComponentSampleModel(
DataBuffer.TYPE_USHORT,
imageWidth, imageHeight, 1,
imageWidth, new int[] {0});
DataBuffer dataBuf = new DataBufferUShort( (short[])data, imageWidth);
WritableRaster wr = Raster.createWritableRaster( csm, dataBuf, null);
System.out.println(wr.getDataBuffer().getDataType());
Hashtable ht = new Hashtable();
ht.put( "owner", "Rafqat Aftab");
return new BufferedImage(ccm, wr, true, ht);
}
public void save() {
try {
ByteArrayOutputStream boutstream = new ByteArrayOutputStream();
JPEGImageEncoder enc = JPEGCodec.createJPEGEncoder(boutstream);
enc.encode(bi);
FileOutputStream fimage = new FileOutputStream(new
File("university-crest.jpg"));
boutstream.writeTo(fimage);
fimage.close();
} catch (Exception e) { System.out.println(e); }
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.drawRenderedImage(bi,null);
}
public static void main (String args[]) {
MakeImage c = new MakeImage();
c.save();
JFrame f = new JFrame();
f.getContentPane().setLayout(new FlowLayout());
f.setSize(1000,1000);
f.getContentPane().add(c);
f.pack();
f.show();
f.repaint();
}
}
