import java.awt.Color;
public class TestMethods
{
   public static void main(String[] args)
   {
     Picture testPicture= new Picture(FileChooser.pickAFile());
     testPicture.show();
     Picture changedPic= testPicture.circleNegate(200,200,30);
     changedPic.show();
   }
}

//PICTURE CLASS

import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.text.*;

/**
 * A class that represents a picture.  This class inherits from 
 * SimplePicture and allows the student to add functionality to
 * the Picture class.  
 * 
 * Copyright Georgia Institute of Technology 2004-2005
 * @author Barbara Ericson ericson@cc.gatech.edu
 */
public class Picture extends SimplePicture 
{
  ///////////////////// constructors //////////////////////////////////
  
  /**
   * Constructor that takes no arguments 
   */
  public Picture ()
  {
    /* not needed but use it to show students the implicit call to super()
     * child constructors always call a parent constructor 
     */
    super();  
  }
  
  /**
   * Constructor that takes a file name and creates the picture 
   * @param fileName the name of the file to create the picture from
   */
  public Picture(String fileName)
  {
    // let the parent class handle this fileName
    super(fileName);
  }
  
  /**
   * Constructor that takes the width and height
   * @param width the width of the desired picture
   * @param height the height of the desired picture
   */
  public Picture(int width, int height)
  {
    // let the parent class handle this width and height
    super(width,height);
  }
  
  /**
   * Constructor that takes a picture and creates a 
   * copy of that picture
   */
  public Picture(Picture copyPicture)
  {
    // let the parent class do the copy
    super(copyPicture);
  }
  
  ////////////////////// methods ///////////////////////////////////////
  
  /**
   * Method to return a string with information about this picture.
   * @return a string with information about the picture such as fileName,
   * height and width.
   */
  public String toString()
  {
    String output = "Picture, filename " + getFileName() + 
      " height " + getHeight() 
      + " width " + getWidth();
    return output;
    
  }

  public void changeRed(double howmuch)
  {
    
    Pixel[] pixelArray=this.getPixels();
    Pixel pixelObj;
    int index=0;
    int value=0;
    while(index<pixelArray.length)
    {
      pixelObj = pixelArray[index];
      value=pixelObj.getRed();
      value= (int)(value*howmuch);
      pixelObj.setRed(value);
      index++;
    }
  }

public Picture circleNegate(int centerx, int centery, int radius)
{
  int x, y;
  Pixel pixelObj;
  for(y=centery-radius; y<=centery+radius; y++)
  {
     for(x = centerx-radius; x <= centerx+radius; x++) 
     {
        if(Math.sqrt((int)((x-centerx)*(x-centerx) + (y-centery)*(y-centery))) <= radius)
        {
         pixelObj= this.getPixel(x,y);
         pixelObj.setRed(255-pixelObj.getRed());
         pixelObj.setBlue(255-pixelObj.getBlue());
         pixelObj.setGreen(255-pixelObj.getGreen());
     }
  }
} 
  return this;
}

public Picture makeGreen()
{
  Pixel pixelObj=null;
  int index=0;
  Pixel[] pixelArray= getPixels();
  while (index< pixelArray.length)
  {
    pixelArray[index]=pixelObj;
    pixelObj.setRed(pixelObj.getRed()/4);
    pixelObj.setBlue(pixelObj.getBlue()/4);
    pixelObj.setGreen(255);
    index++;
  }
  return this;
}

public Picture mirrorHorizontal()
{
  int midpoint=this.getHeight()/2;
  Pixel topPixel, bottomPixel;
  for(int y=0; y<midpoint; y++)
  {
    for(int x=0; x<this.getWidth(); x++)
    {
      topPixel=getPixel(x,y);
      bottomPixel=getPixel(this.getWidth() - 1 - x,y);
      bottomPixel.setColor(topPixel.getColor());
    }
  }
  return this;
}

}