/*   光がキラン ImageFilter  Ver 0.10   */
/*                                      */
/*                                      */
/*   by Atsushi                98/4/9   */


package net.antun.lib.awt.image;

import java.awt.Point;
import java.awt.image.*;


public class LightImageFilter extends RGBImageFilter
{
	/*   ---   定数   ---   */

	public final static int DEFAULT=0;
	public final static int CIRCLE =1;
	public final static int SPHERE =2;

	/*   ---   Field   ---   */

	private int type;
	private int brightness,ox,oy;

	/*   ---   Constructor   ---   */

	public LightImageFilter(int type,int brightness,int x,int y)
	{
		this.type=type;
		this.brightness=brightness;
		this.ox=x;
		this.oy=y;
	}

	/*   ---   フィルタリング   ---   */

	public int filterRGB(int x,int y,int rgb)
	{
		int r,g,b,d=0;
	
		switch (type)
		{
		case CIRCLE:
			d=Math.max(0,(int)(brightness
			 -Math.sqrt((x-ox)*(x-ox)+(y-oy)*(y-oy))*4.0));
			break;
		case SPHERE:
			d=Math.max(0,(int)(brightness-((x-ox)*(x-ox)+(y-oy)*(y-oy))));
			break;
		}
		r=Math.min(Math.max(((rgb>>16) & 0xff)+d,0),255);
		g=Math.min(Math.max(((rgb>> 8) & 0xff)+d,0),255);
		b=Math.min(Math.max(((rgb>> 0) & 0xff)+d,0),255);
		return ((rgb & 0xff000000) | (r<<16) | (g<<8) | (b<<0));
	}

	/*   ---   文字列化   ---   */

	public String toString()
	{
		return getClass().getName()+"[x="+ox+",y="+oy+"]";
	}
}