/*   回転 ImageFilter  Ver 0.20   */
/*                                */
/*                                */
/*   by Atsushi         98/5/21   */


package net.antun.lib.awt.image;

import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.image.ColorModel;
import java.awt.image.ImageFilter;
import java.util.Hashtable;


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

	private int width,height;

	private double angle;
	private int ox,oy;

	private double sin,cos;							// 高速化用

	/*   ---   Constructor   ---   */

	public RotateImageFilter(double angle)
	{
		this.angle=angle;
		
		sin=Math.sin(angle);
		cos=Math.cos(angle);
	}

	/*   ---   フィルタリング   ---   */

	public void setDimensions(int width,int height)
	{
		double minx,miny,maxx,maxy;
		double xx,yy;
	
		super.setDimensions(width,height);
		
		minx=Double.POSITIVE_INFINITY;
		miny=Double.POSITIVE_INFINITY;
		maxx=Double.NEGATIVE_INFINITY;
		maxy=Double.NEGATIVE_INFINITY;
		
		for (int y=0;y<=1;y++)
		{
			for (int x=0;x<=1;x++)
			{
				xx=cos*(x*width )+sin*(y*height);
				yy=cos*(y*height)-sin*(x*width );
				minx=Math.min(minx,xx);
				miny=Math.min(miny,yy);
				maxx=Math.max(maxx,xx);
				maxy=Math.max(maxy,yy);
			}
		}
		ox=-(int)(Math.floor(minx));
		oy=-(int)(Math.floor(miny));
		this.width =(int)(Math.ceil(maxx))+ox+1;
		this.height=(int)(Math.ceil(maxy))+oy+1;
		
		consumer.setDimensions(this.width,this.height);
	}

	protected void filterImage()
	{
		int p[],xx,yy;
		double x1,y1,x2,y2,dx,dy;
	
		p=new int[width];
		for (int y=0;y<=height-1;y++)
		{
			x1=cos*(0-ox)-sin*(y-oy);
			y1=cos*(y-oy)+sin*(0-ox);
			x2=cos*(width-ox)-sin*(y    -oy);
			y2=cos*(y    -oy)+sin*(width-ox);
			dx=(x2-x1)/width;
			dy=(y2-y1)/width;
			for (int x=0;x<=width-1;x++)
			{
				xx=(int)(Math.round(x1));
				yy=(int)(Math.round(y1));
				if (0<=xx && xx<=originalSize.width -1 &&
				    0<=yy && yy<=originalSize.height-1)
				{
					p[x]=original[xx+yy*originalSize.width];
				}
				else
				{
					p[x]=0;
				}
				x1+=dx;
				y1+=dy;
			}
			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()+"[angle="+angle+"]";
	}
}