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/*
Copyright 2006 Jerry Huxtable

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package com.jhlabs.image;

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;

public class MotionBlurOp extends AbstractBufferedImageOp {
    private float centreX = 0.5f, centreY = 0.5f;
    private float distance;
    private float angle;
    private float rotation;
    private float zoom;

    public MotionBlurOp() {
	}
	
	public MotionBlurOp( float distance, float angle, float rotation, float zoom ) {
        this.distance = distance;
        this.angle = angle;
        this.rotation = rotation;
        this.zoom = zoom;
    }
    
	public void setAngle( float angle ) {
		this.angle = angle;
	}

	public float getAngle() {
		return angle;
	}
	
	public void setDistance( float distance ) {
		this.distance = distance;
	}

	public float getDistance() {
		return distance;
	}
	
	public void setRotation( float rotation ) {
		this.rotation = rotation;
	}

	public float getRotation() {
		return rotation;
	}
	
	public void setZoom( float zoom ) {
		this.zoom = zoom;
	}

	public float getZoom() {
		return zoom;
	}
	
	public void setCentreX( float centreX ) {
		this.centreX = centreX;
	}

	public float getCentreX() {
		return centreX;
	}
	
	public void setCentreY( float centreY ) {
		this.centreY = centreY;
	}

	public float getCentreY() {
		return centreY;
	}
	
	public void setCentre( Point2D centre ) {
		this.centreX = (float)centre.getX();
		this.centreY = (float)centre.getY();
	}

	public Point2D getCentre() {
		return new Point2D.Float( centreX, centreY );
	}
	
    private int log2( int n ) {
        int m = 1;
        int log2n = 0;

        while (m < n) {
            m *= 2;
            log2n++;
        }
        return log2n;
    }

    public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
        if ( dst == null )
            dst = createCompatibleDestImage( src, null );
        BufferedImage tsrc = src;
        float cx = (float)src.getWidth() * centreX;
        float cy = (float)src.getHeight() * centreY;
        float imageRadius = (float)Math.sqrt( cx*cx + cy*cy );
        float translateX = (float)(distance * Math.cos( angle ));
        float translateY = (float)(distance * -Math.sin( angle ));
        float scale = zoom;
        float rotate = rotation;
        float maxDistance = distance + Math.abs(rotation*imageRadius) + zoom*imageRadius;
        int steps = log2((int)maxDistance);

		translateX /= maxDistance;
		translateY /= maxDistance;
		scale /= maxDistance;
		rotate /= maxDistance;
		
        if ( steps == 0 ) {
            Graphics2D g = dst.createGraphics();
            g.drawRenderedImage( src, null );
            g.dispose();
            return dst;
        }
        
        BufferedImage tmp = createCompatibleDestImage( src, null );
        for ( int i = 0; i < steps; i++ ) {
            Graphics2D g = tmp.createGraphics();
            g.drawImage( tsrc, null, null );
			g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
			g.setRenderingHint( RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR );
			g.setComposite( AlphaComposite.getInstance( AlphaComposite.SRC_OVER, 0.5f ) );

            g.translate( cx+translateX, cy+translateY );
            g.scale( 1.0001+scale, 1.0001+scale );  // The .0001 works round a bug on Windows where drawImage throws an ArrayIndexOutofBoundException
            if ( rotation != 0 )
                g.rotate( rotate );
            g.translate( -cx, -cy );

            g.drawImage( dst, null, null );
            g.dispose();
            BufferedImage ti = dst;
            dst = tmp;
            tmp = ti;
            tsrc = dst;

            translateX *= 2;
            translateY *= 2;
            scale *= 2;
            rotate *= 2;
        }
        return dst;
    }
    
	public String toString() {
		return "Blur/Motion Blur...";
	}
}