import Myro.*;

public class MyroPicture
{

    private MyroImage image;
    public MyroPicture()
    {

        boolean success;
        image = new MyroColorImage();
        success = image.loadImage("cat.jpg");
        if( !success )
        {
            MyroGUI.tellUser("Error Opening Image File");
        }
        else
        {
            image.show();
            makeGrey();
            blur(4);
            shrink(3.2);
            expand(1.5);
            //findCenter()
        }
    }

    private void makeGrey()
    {
        MyroImage newImage = new MyroColorImage( image.getWidth(), image.getHeight());
        for( int x=0; x<newImage.getWidth(); x++ )
        {
            for( int y=0; y<newImage.getHeight(); y++ )
            {
                MyroPixel p = image.getPixel( x, y );
                newImage.getPixel(x,y).setGray(p.getGray());
            }
        }
        newImage.show("makeGrey()");
    }

    //blur the image by averaging over toAveOver pixels up,down,left,right
    //As we did in class, if toAveOver==1, you'd want to have each pixel 
    //be the average of 9 pixels, except when you're on the edge or in a corner
    //for now, do the blur "in place"
    private void blur(int toAveOver)
    {
        MyroImage newImage = new MyroColorImage( image.getWidth(), image.getHeight());

        for( int x=0; x<newImage.getWidth(); x++ )
        {
            for( int y=0; y<newImage.getHeight(); y++ )
            {
                int count = 0;
                int sum = 0;
                for (int row = x-toAveOver; row < x+toAveOver; row++)
                {
                    for (int col = y-toAveOver; col < y+toAveOver; col++)
                    {
                        if (row >= 0 && row < image.getWidth() &&
                        col >= 0 && col < image.getHeight())
                        {
                            MyroPixel p = image.getPixel( row, col );
                            sum += p.getGray();
                            count++;
                        }
                    }
                }
                newImage.getPixel(x,y).setGray((int)(sum/(double)count));
            }
        }
        newImage.show("smoothed(" + toAveOver + ")");

    }
    //shrink the image by a factor of shrink and display as a new picture
    private void shrink(double shrink)
    {
        int oldWidth = image.getWidth();
        int oldHeight = image.getHeight();
        int newWidth = (int)((double)oldHeight / shrink);
        int newHeight = (int)((double)oldHeight / shrink);        
        MyroImage newImage = new MyroColorImage( newWidth, newHeight );

        //Now, go through each pixel in the image and figure out where it should go in the newImage
        for( int x=0; x<oldWidth; x++ )
        {
            for( int y=0; y<oldHeight; y++ )
            {
                MyroPixel p = image.getPixel( x, y );
                MyroPixel q = newImage.getPixel((int)(x*(double)newWidth/oldWidth), (int)(y*(double)newHeight/oldHeight));
                q.setGray(p.getGray());
            }
        }

        newImage.show("After shrink " + shrink);

    }

    //expand the image by a factor of expand and display as a new picture
    private void expand(double expand)
    {
       int oldWidth = image.getWidth();
        int oldHeight = image.getHeight();
        int newWidth = (int)((double)oldHeight * expand);
        int newHeight = (int)((double)oldHeight * expand);        
        MyroImage newImage = new MyroColorImage( newWidth, newHeight );

        //Now, go through each pixel in the image and figure out where it should go in the newImage
        for( int x=0; x<newWidth; x++ )
        {
            for( int y=0; y<newHeight; y++ )
            {
                MyroPixel p = image.getPixel( (int)(x*(double)oldWidth/newWidth), (int)(y*(double)oldHeight/newHeight));
                MyroPixel q = newImage.getPixel(x,y);
                q.setGray(p.getGray());
            }
        }

        newImage.show("After expand " + expand);
    }

    //find the center of the cat's eyes and return its location as x,y
    private double[] findCenter()
    {
        return new double[2];
    }

}