public void changeColor(double redFactor, double greenFactor, double blueFactor)
   {
       // change the values 
       this.changeRed(redFactor);
       this.changeGreen(greenFactor);
       this.changeBlue(blueFactor);
       
   }//End changeColor
   
 
 public void changeRed(double factor)
   {
     Pixel[] pixelArray = this.getPixels();
     int value = 0;
     
     //loop through the array of pixels; pixelObj is a variable pointing
     //the current pixel
     for (Pixel pixelObj : pixelArray)
     {
       // get the red value 
       value = pixelObj.getRed();
       
       //set the red value to double its current value
       pixelObj.setRed((int)(value*factor));
     }
   }//End ChangeRed
  
 
 public void changeGreen(double factor)
   {
     Pixel[] pixelArray = this.getPixels();
     int value = 0;
     
     //loop through the array of pixels; pixelObj is a variable pointing
     //the current pixel
     for (Pixel pixelObj : pixelArray)
     {
       // get the green value 
       value = pixelObj.getGreen();
       
       //set the green value to double its current value
       pixelObj.setGreen((int)(value*factor));
     }
   }//End ChangeGreen
 
 
 public void changeBlue(double factor)
   {
     Pixel[] pixelArray = this.getPixels();
     int value = 0;
     
     //loop through the array of pixels; pixelObj is a variable pointing
     //the current pixel
     for (Pixel pixelObj : pixelArray)
     {
       // get the blue value 
       value = pixelObj.getBlue();
       
       //set the blue value to double its current value
       pixelObj.setBlue((int)(value*factor));
     }
   }//End ChangeBlue


public void mirrorHoriz()
   {
    //This method mirrors horizontally
     Pixel topPixel = null;
     Pixel bottomPixel = null;
     int arrayHeight = this.getHeight()-1;
     int mirrorPoint = this.getHeight()/2;
     
     //loop through every column of pixels
     for (int x=0; x < this.getWidth(); x++)
     {
       //loop through the rows until you reach the mirror point
       for (int y = 0; y < mirrorPoint; y++)
       {
       // get the pixel to copy
       topPixel = this.getPixel(x,y);
       
       //get the pixel to change
       bottomPixel = this.getPixel(x,arrayHeight-y);
       
       //copy the color from one to the other
       bottomPixel.setColor(topPixel.getColor());
   
         }
       }
   }  //end mirrorHoriz

public void createCollage(Picture source1Picture, Picture source2Picture)
{
  //variables to use as parameters in the copy method
  int targetX=0;
  int targetY=0;

  int maxHeight = Math.max(source1Picture.getHeight(), source2Picture.getHeight());
  int targetHeight = this.getHeight();
  int targetWidth = this.getWidth();
  
  int xCounter = this.getWidth()/(source1Picture.getWidth()+source2Picture.getWidth());
  int yCounter = this.getHeight()/(maxHeight);

  //I'm using this counter concept because I couldn't get the loop
  //to work using checks on the target height and width vs what it would
  //be after adding the width or height of the next two pictures
  
  for (int y = 0; y < yCounter; y++)
  {
  for (int x=0; x < xCounter; x++)
  { 
 
    // change the color for the pictures
    //if this is the first or an even row, change red and blue; otherwise, change green

    if ((y==0 || y%2==0) && y!=1)
    {
    source1Picture.changeBlue(.10);
    source2Picture.changeRed(.10);
    }
    else
    {
     source1Picture.changeGreen(.50);
     source2Picture.changeGreen(.50);
    }
    
    //copy the first picture; copy the second if space allows
    this.copy(source1Picture,0,0,
              source1Picture.getWidth(),
              source1Picture.getHeight(),
              targetX,targetY);
    
    targetX=targetX+source1Picture.getWidth();
    if (targetWidth > (targetX + source2Picture.getWidth()))
    {
    // copy source2Picture 
    
    this.copy(source2Picture,0,0,
              source2Picture.getWidth(),
              source2Picture.getHeight(),
              targetX,targetY);
    }
    targetX=targetX+source2Picture.getWidth();;
  }
  targetY = targetY+maxHeight;
  targetX=0;
  }
}//end createCollage


public static void main(String[] args) 
  {
   //Choose the pictures to copy then the target
    Picture pict1 = new Picture(FileChooser.pickAFile());
    Picture pict2 = new Picture(FileChooser.pickAFile());
    Picture blank = new Picture(FileChooser.pickAFile()); //choose the picture
    
    blank.createCollage(pict1,pict2);
    blank.mirrorHoriz();
    blank.write(FileChooser.getMediaPath("DH-BegJavaHmwk6-25-08.jpg"));
    blank.explore();//show the picture
    
    
    
  }