PImage img, imgOriginal;
byte[][] imageArray;
byte[][] maskArray;
int currentImage = 0;
String[] images = {"print1.png", "print1b.png", "print2.png", "print2b.png", "print3.png", "print3b.png"};

void loadPixelArray(PImage anImage)
{
	anImage.loadPixels();
}

color getPixelColor(PImage anImage, int x, int y)
{
	color pixelColor = anImage.get(x,y);
	return pixelColor;
}

void refreshImagePixels(PImage anImage)
{
	anImage.updatePixels();
}

void setPixelColor(PImage anImage, int x, int y, color aColor)
{
	anImage.set(x,y,aColor);
}

void initImage(String fileName)
{
	img = loadImage(fileName);
	imgOriginal = loadImage(fileName);

	size(img.width * 2, img.height);
	frame.setSize(img.width * 2, img.height);

	loadPixelArray(img);

	imageArray = new byte[img.width][img.height];
	maskArray = new byte[img.width][img.height];

	for (int col = 1; col < img.width - 1; col++)
	{
		for (int row=1; row<img.height-1; row++)
		{
			maskArray[col][row] = 0;

			if (brightness(img.get(col, row)) < 127){
				imageArray[col][row] = 1;
			} else {
				imageArray[col][row] = 0;
			}
		}
	}
}

void setup()
{
	initImage(images[0]);
}

void mousePressed()
{
	currentImage = currentImage + 1;

	if (currentImage >= images.length)
	{
		currentImage = 0;
	}

	initImage(images[currentImage]);
}

void thinning(PImage img, byte[][] imageArray, byte [][] maskArray)
{for(int a = 0; a<5;a++){
for(int i = 0; i<img.width; i++){
      for (int j =0; j<img.height;j++){
        if (imageArray[i][j]==1){
          if(imageArray[i][j-1]==0 && imageArray[i][j+1]==1){
            if(imageArray[i-1][j]== 1 || imageArray[i-1][j+1]==1 || imageArray[i-1][j-1]==1 || imageArray[i+1][j]==1 || imageArray[i+1][j-1]==1 || imageArray[i+1][j+1] == 1){
              if ((1-imageArray[i+1][j]) - ((1-imageArray[i+1][j])*(1-imageArray[i+1][j-1])*(1-imageArray[i][j-1])) + (1-imageArray[i][j-1]) - ((1-imageArray[i][j-1])*(1-imageArray[i-1][j-1])*(1-imageArray[i-1][j])) + (1-imageArray[i-1][j]) - ((1-imageArray[i-1][j])*(1-imageArray[i-1][j+1])*(1-imageArray[i][j+1])) + (1-imageArray[i][j+1]) - ((1-imageArray[i][j+1])*(1-imageArray[i+1][j+1])*(1-imageArray[i+1][j]))==1){
                maskArray[i][j] = 1;

              }
            }
          }
        }
      }
}
processImagePixels();

for(int i = 0; i<img.width; i++){
      for (int j =0; j<img.height;j++){
        if (imageArray[i][j]==1){
        if(imageArray[i-1][j]==0 && imageArray[i+1][j]== 1){
          if(imageArray[i-1][j+1]== 1 || imageArray[i-1][j-1]==1 || imageArray[i][j-1]==1 || imageArray[i][j+1]==1 || imageArray[i+1][j-1]==1 || imageArray[i+1][j+1] == 1){
            if ((1-imageArray[i+1][j]) - ((1-imageArray[i+1][j])*(1-imageArray[i+1][j-1])*(1-imageArray[i][j-1])) + (1-imageArray[i][j-1]) - ((1-imageArray[i][j-1])*(1-imageArray[i-1][j-1])*(1-imageArray[i-1][j])) + (1-imageArray[i-1][j]) - ((1-imageArray[i-1][j])*(1-imageArray[i-1][j+1])*(1-imageArray[i][j+1])) + (1-imageArray[i][j+1]) - ((1-imageArray[i][j+1])*(1-imageArray[i+1][j+1])*(1-imageArray[i+1][j]))==1){
              maskArray[i][j] = 1;

            }
          }
        }
        }
      }
}processImagePixels();

for(int i = 0; i<img.width; i++){
      for (int j =0; j<img.height;j++){
        if (imageArray[i][j]==1){
        if(imageArray[i][j+1]==0 && imageArray[i][j-1]== 1){
          if(imageArray[i-1][j+1]== 1 || imageArray[i-1][j-1]==1 || imageArray[i-1][j]==1 || imageArray[i+1][j]==1 || imageArray[i+1][j-1]==1 || imageArray[i+1][j+1] == 1){
            if ((1-imageArray[i+1][j]) - ((1-imageArray[i+1][j])*(1-imageArray[i+1][j-1])*(1-imageArray[i][j-1])) + (1-imageArray[i][j-1]) - ((1-imageArray[i][j-1])*(1-imageArray[i-1][j-1])*(1-imageArray[i-1][j])) + (1-imageArray[i-1][j]) - ((1-imageArray[i-1][j])*(1-imageArray[i-1][j+1])*(1-imageArray[i][j+1])) + (1-imageArray[i][j+1]) - ((1-imageArray[i][j+1])*(1-imageArray[i+1][j+1])*(1-imageArray[i+1][j]))==1){
              maskArray[i][j] = 1;

            }
          }
        }}}}processImagePixels();

        for(int i = 0; i<img.width; i++){
      for (int j =0; j<img.height;j++){
        if (imageArray[i][j]==1){
        if(imageArray[i+1][j]==0 && imageArray[i-1][j]== 1){
          if(imageArray[i-1][j+1]== 1 || imageArray[i-1][j-1]==1 || imageArray[i][j-1]==1 || imageArray[i][j+1]==1 || imageArray[i+1][j-1]==1 || imageArray[i+1][j+1] == 1){
            if ((1-imageArray[i+1][j]) - ((1-imageArray[i+1][j])*(1-imageArray[i+1][j-1])*(1-imageArray[i][j-1])) + (1-imageArray[i][j-1]) - ((1-imageArray[i][j-1])*(1-imageArray[i-1][j-1])*(1-imageArray[i-1][j])) + (1-imageArray[i-1][j]) - ((1-imageArray[i-1][j])*(1-imageArray[i-1][j+1])*(1-imageArray[i][j+1])) + (1-imageArray[i][j+1]) - ((1-imageArray[i][j+1])*(1-imageArray[i+1][j+1])*(1-imageArray[i+1][j]))==1){
              maskArray[i][j] = 1;

            }}}}
          }
        }processImagePixels();
      }
}




 void processImagePixels()
{
  for(int i = 0; i<img.width; i++){
      for (int j =0 ; j<img.height;j++){
        if (maskArray[i][j] == 1){
          setPixelColor(img,i,j, color(255));}

         // else
         // setPixelColor(img,i,j, color(0));}
         maskArray[i][j] = 0;
         if (brightness(img.get(i, j)) < 127){
				imageArray[i][j] = 1;
			} else {
				imageArray[i][j] = 0;
			}
  }

  refreshImagePixels(img);

}
}


void draw()
{
	image(imgOriginal,0,0);
	thinning(img, imageArray, maskArray);
	image(img,img.width,0);
}