/*
 * A more efficient MemoryImageSource example?
 *
 * Lifted from John Zukowski's article "Creating in-memory images
 * in Java Save network bandwidth by creating images at run time"
 * (http://www.javaworld.com/javaworld/javatips/jw-javatip16.html)
 * by Andrew Barclay, abb@nuccard.eushc.org on 10/4/96.
 *
 */
import java.awt.*;
import java.awt.image.*;

public class jwmem_abb extends java.applet.Applet {
    Image i;
    int pad = 0 ;

    public void init() {
	String param ;

	if( (param = getParameter( "pad" )) != null ) {
	    pad = Integer.parseInt( param ) ;
	}

	/*
	 * This is a potential costly computation and should not be
	 * done in the init() method as this runs in the browser's
	 * thread, but I'm too lazy to set up a thread.
	 */

	//Since image doesn't vary in x, make width = 1.
	int height = size().height ;
        int[] pixels = new int [height];
	double radianConversion = Math.PI / 180.0;

        for (int y=0;y<height;y++) {
	    int c = (int)(255.0 * Math.abs(
		Math.sin( radianConversion*(y+height) )
	    ));

	    // Make c an int -- ((byte)c<<16) overflows.
	    pixels[y] = ((0xff<<24) | (c<<16) | (c<<8) | c);
	}
        i = createImage (new MemoryImageSource (1, height, pixels, 0, 1));

	setFont (new Font ("TimesRoman", Font.BOLD | Font.ITALIC, 32));
    }

    public void paint (Graphics g) {
	// Let drawImage do the scaling work in native code.
        g.drawImage (i, pad, pad,
		size().width-2*pad, size().height-2*pad, this);

	g.drawString ("JavaWorld", 30, 80);
    }
}