/**
 * Class for creating a template for a simple Java program
 * 
 * @author Pat Troy: troy AT uic DOT edu
 */

// import the library with the color information
import java.awt.Color;

// Note the name of the class in the following line MUST
// match the name of the file.  This is stored in a file
// named: Template.java 
public class Lect1021a
{
  
  public static void main (String[] args) 
  {
    System.out.println("Begin Java Exection");
    System.out.println("");

    // Select two pictures
    String filename = FileChooser.pickAFile();
    System.out.println (filename);
    Picture pict1 = new Picture(filename);
    System.out.println (pict1);
    
    filename = FileChooser.pickAFile();
    System.out.println (filename);
    Picture pict2 = new Picture(filename);
    System.out.println (pict2);
    
    // call the method to modify the picture
    Picture anotherPicture;
    anotherPicture = createBlankCanvas (pict1, pict2);
    System.out.println (anotherPicture);
    
    // copy the pixels from pict1 into anotherPicture
    anotherPicture = copyPicture2 (pict1, anotherPicture, 0, 0);
    anotherPicture = copyPicture2 (pict2, anotherPicture, pict1.getWidth(), 0);
    
    // display the picture
    anotherPicture.show();
    
    // Save the picture
    //String fname;
    //fname = FileChooser.pickAFile();
    //System.out.println ("File: " + filename);
    //pict1.write (fname);

    System.out.println("");
    System.out.println("End Java Exection");
  }   // end of the method main
  
  public static Picture createBlankCanvas (Picture p1, Picture p2)
  {
    // get the height and width of my two pictures
    int width1 = p1.getWidth();
    int height1 = p1.getHeight();
    int width2 = p2.getWidth();
    int height2 = p2.getHeight();
    
    // calcuate the width needed for the final picture
    int width3 = width1 + width2;
    int height3;
    if ( height1 > height2 )
      height3 = height1;
    else
      height3 = height2;
    
    // create and return the new picture of the proper size
    Picture blankCanvas = new Picture (width3, height3);
    return blankCanvas;
  }
 
  public static Picture copyPicture (Picture pictA, Picture pictC)
  {
    // get the width and height of the picture
    int width = pictA.getWidth();
    int height = pictA.getHeight();
   
    // set up a nested loop (one loop inside another) to access each pixel
    int xLoopCounter;
    int yLoopCounter;
    
    // the outer loop varies the X position (which column the pixel is in)
    for ( xLoopCounter = 0 ; xLoopCounter < width ; xLoopCounter++ )
    {
      // the inner loop varies the Y position (which row the pixel is in)
      for ( yLoopCounter = 0 ; yLoopCounter < height ; yLoopCounter++ )
      {
        // access a pixel and its colors from the first picture
        Pixel pA = pictA.getPixel (xLoopCounter, yLoopCounter); 
        int red = pA.getRed();
        int green = pA.getGreen();
        int blue = pA.getBlue();
        
        // calculate the new position for the pixel information
        int newXPos, newYPos;
        newXPos =  xLoopCounter;
        newYPos =  yLoopCounter;
        
        // save the modified color values
        Pixel pC = pictC.getPixel (newXPos, newYPos);
        pC.setRed(red);
        pC.setGreen(green);
        pC.setBlue(blue);
      }
    }
    
    // add the code to return the newly created picture
    return pictC;
  }  // end of the method to modify the picture
  
  
  public static Picture copyPicture2 (Picture pictA, Picture pictC, int offsetX, int offsetY)
  {
    // get the width and height of the picture
    int width = pictA.getWidth();
    int height = pictA.getHeight();
   
    // set up a nested loop (one loop inside another) to access each pixel
    int xLoopCounter;
    int yLoopCounter;
    
    // the outer loop varies the X position (which column the pixel is in)
    for ( xLoopCounter = 0 ; xLoopCounter < width ; xLoopCounter++ )
    {
      // the inner loop varies the Y position (which row the pixel is in)
      for ( yLoopCounter = 0 ; yLoopCounter < height ; yLoopCounter++ )
      {
        // access a pixel and its colors from the first picture
        Pixel pA = pictA.getPixel (xLoopCounter, yLoopCounter); 
        int red = pA.getRed();
        int green = pA.getGreen();
        int blue = pA.getBlue();
        
        // calculate the new position for the pixel information
        int newXPos, newYPos;
        newXPos =  xLoopCounter + offsetX;
        newYPos =  yLoopCounter + offsetY; 
        
        // save the modified color values
        Pixel pC = pictC.getPixel (newXPos, newYPos);
        pC.setRed(red);
        pC.setGreen(green);
        pC.setBlue(blue);
      }
    }
    
    // add the code to return the newly created picture
    return pictC;
  }  // end of the method to modify the picture
  
  
  
  public static Picture modifyPicture (Picture pictA, 
                                       int startX,    int startY,
                                       int endX,      int endY)
  {
    // get the width and height of the picture
    int width = pictA.getWidth();
    int height = pictA.getHeight();
    
    // determine the width and height of the cropped portion
    int cWidth = endX - startX;
    int cHeight = endY - startY;
  
    // create a new Picture to store the grayScale image
    Picture pictC = new Picture (cWidth, cHeight);
    
    // set up a nested loop (one loop inside another) to access each pixel
    int xLoopCounter;
    int yLoopCounter;
    
    // the outer loop varies the X position (which column the pixel is in)
    for ( xLoopCounter = startX ; xLoopCounter < endX ; xLoopCounter++ )
    {
      // the inner loop varies the Y position (which row the pixel is in)
      for ( yLoopCounter = startY ; yLoopCounter < endY ; yLoopCounter++ )
      {
        // access a pixel and its colors from the first picture
        Pixel pA = pictA.getPixel (xLoopCounter, yLoopCounter); 
        int red = pA.getRed();
        int green = pA.getGreen();
        int blue = pA.getBlue();
        
        // calculate the new position for the pixel information
        int newXPos, newYPos;
        newXPos =  xLoopCounter - startX;
        newYPos =  yLoopCounter - startY;
        
        // save the modified color values
        Pixel pC = pictC.getPixel (newXPos, newYPos);
        pC.setRed(red);
        pC.setGreen(green);
        pC.setBlue(blue);
      }
    }
    
    // add the code to return the newly created picture
    return pictC;
  }  // end of the method to modify the picture
  
} // end of Lect914b class