/*   鳴門 ImageFilter  Ver 0.10   */
/*                                */
/*                                */
/*   by Atsushi          98/4/9   */


package net.antun.lib.awt.image;

import java.awt.Dimension;
import java.awt.image.ColorModel;


public class NaltImageFilter extends SinglepassImageFilter
{
	/*   ---   Field   ---   */

	private int width,height;

	private double amplitude;

	/*   ---   Constructor   ---   */

	public NaltImageFilter(double amplitude)
	{
		this.amplitude=amplitude;
	}

	/*   ---   フィルタリング   ---   */

	public void setDimensions(int width,int height)
	{
		double r;
	
		super.setDimensions(width,height);
		
		r=Math.sqrt((width/2.0)*(width/2.0)+(height/2.0)*(height/2.0));
		this.width =width +(int)(r-width /2.0)*2;
		this.height=height+(int)(r-height/2.0)*2;
		
		consumer.setDimensions(this.width,this.height);
	}

	protected void filterImage()
	{
		double r,th;
		int xx,yy,cx,cy;
		int p[];
	
		p=new int[width];
		cx=width /2;
		cy=height/2;
		for (int y=0;y<=height-1;y++)
		{
			for (int x=0;x<=width-1;x++)
			{
				th=Math.atan2(y-cy,x-cx);
				r=Math.sqrt((x-cx)*(x-cx)+(y-cy)*(y-cy));
				xx=(int)(Math.cos(th+amplitude/r)*r)+originalSize.width /2;
				yy=(int)(Math.sin(th+amplitude/r)*r)+originalSize.height/2;
				if (0<=xx && xx<originalSize.width &&
				    0<=yy && yy<originalSize.height)
				{
					p[x]=original[xx+yy*originalSize.width];
				}
				else
				{
					p[x]=0;
				}
			}
			consumer.setPixels(0,y,width,1,defaultRGB,p,0,width);
		}
	}

	public void setHints(int hint)
	{
		consumer.setHints(TOPDOWNLEFTRIGHT | COMPLETESCANLINES |
		                  SINGLEPASS | (hint & SINGLEFRAME));
	}

	/*   ---   文字列化   ---   */

	public String toString()
	{
		return getClass().getName()+"[amplitude="+amplitude+"]";
	}
}