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/*********************************************************************************************/
/*
*/
/* Java Image Tutorials - Tut x.x
*/
/* Auth: bkenwright@xbdev.net
*/
/*
*/
/* Loading an image and getting at its pixels with java 1.1 and
later! */
/* We simple load in an image and extract the pixel data - the data
is rendered to the */
/* screen to show its actually done what it was suppose
to. */
/* We use a very simple pixel plotting code (e.g. fillRect) to draw
the image pixels - even */
/* though there are more efficent ways.
/*
*/
/*********************************************************************************************/
import
java.awt.image.*;
import
java.awt.*;
import
java.applet.*;
/*********************************************************************************************/
/*
*/
/* class
Texture
*/
/* The class takes a filename, and loads the image -either jpg or a
gif. Once loaded it */
/* extracts the pixel information into an array, so that you can
access and use the pixel */
/* information as you need - to create those special effects or
demo's that require pixel */
/*
operations.
*/
/*
*/
/* The class had to extend Applet so that we could use MediaTracker
- also, we needed to */
/* pass the pointer to the parent applet so that we could load the
images. As it woudln't */
/* cooperate with 'getImage' or 'getDocumentBase()' unless we used
the main applet...hence */
/* the reason for passing the parent
pointer. */
/*
*/
/*********************************************************************************************/
class
Texture
extends
Applet
{
public
int
Width;
public
int
Height;
public
int[]
Pixels;
public
int
Create(Applet parent, String szFileName)
{
// Load Image
Image image=parent.getImage( parent.getDocumentBase(), szFileName);
MediaTracker mediatracker =
new
MediaTracker(this);
mediatracker.addImage(image, 0);
try
{ mediatracker.waitForID(0); }
catch(InterruptedException
ex) {}
// Init sprite pixels array
Width = image.getWidth(null);
Height = image.getHeight(null);
Pixels =
new
int[Width*Height];
// Grab pixels
PixelGrabber pg=
new
PixelGrabber(image,0,0,Width,Height,Pixels,0,Width);
try
{ pg.grabPixels(); }
catch
(InterruptedException e) {}
//image=null; mediatracker=null;
return
1;
}//
End Create(..)
}//End class texture
/*********************************************************************************************/
/*
*/
/* Entry Class
Point
*/
/* This is the class that is initialised and starts our applet
*/
/*
*/
/*********************************************************************************************/
public class
imagepixels
extends
Applet
{
Texture tex;
public
void
init()
{
tex =
new
Texture();
tex.Create(this,
"test.jpg");
}//
End of init(..)
public
void
paint(Graphics g)
{
int[]
pixels = tex.Pixels;
PaintTexture(g, pixels,
tex.Width, tex.Height );
}//
End of paint(..)
void
PaintTexture(Graphics g,
int
pix[],
int
w,
int
h)
{
for(int
y=0; y<h; y++)
for(int
x=0; x<w; x++)
{
int
col = pix[x + y*w];
setPixel(g, x, y, col);
}//End
loops
}//End
PaintTexture(..)
public
void
setPixel(Graphics g,
int
x,
int
y,
int
c )
{
Color color =
new
Color( (c>>16)&0xFF,
(c>>8)&0xFF,
(c)&0xFF );
g.setColor( color );
g.fillRect( x, y, 1, 1 );
}//
End of setPixel(..) int
}// End of Applet |
