//making a slide puzzle

//variables for the coordinates of the pictures
int[] x = new int[9];
int[] y = new int[9];

//store image
PImage cute;

//set up
void setup() {
  size(640,428);
  cute = loadImage("cute.jpg");
  image(cute,0,0);
  println(x[5]);
  
  //Setup puzzle pieces (was created by playing)
  x[0] = 0;
  x[1] = 1;
  x[2] = 1;
  x[3] = 2;
  x[4] = 1;
  x[5] = 2;
  x[6] = 0;
  x[7] = 0;
  x[8] = 2;
  y[0] = 0;
  y[1] = 2;
  y[2] = 1;
  y[3] = 1;
  y[4] = 0;
  y[5] = 0;
  y[6] = 1;
  y[7] = 2;
  y[8] = 2;
}


//split the picture into sections and find the mouse coordinate and swap pieces if adjacent
void draw () {
  background(0);
  for (int j = 2; j>=0; j--) {
    for (int i = 2; i>=0; i--) {
      if (i == 2 && j == 2){
        copy(cute, width/3*i, height/3*j, width/3, height/3, width/3*x[j*3+i], height/3*y[j*3+i],width/3, height/3);
        filter(GRAY);
      } else {
        copy(cute, width/3*i, height/3*j, width/3, height/3, width/3*x[j*3+i], height/3*y[j*3+i],width/3, height/3);
      }
    }
  }
  if (mousePressed){
    int squareX = mouseX/(width/3), squareY = mouseY/(height/3);
    for(int a = 0; a<9; a++) {
      if (squareX == x[a] && squareY == y[a]) {
        if (a != 8){
          if ((x[a]+1 == x[8] && y[a] == y[8])
            ||(x[a]-1 == x[8] && y[a] == y[8])
            ||(y[a]+1 == y[8] && x[a] == x[8])
            ||(y[a]-1 == y[8] && x[a] == x[8])) {
              int oldax = x[a];
              int olday = y[a];
              x[a] = x[8];
              y[a] = y[8];
              x[8] = oldax;
              y[8] = olday;
          }
        }
      } 
    }
  }
}