matrix8x8.pde

int w = 50;

boolean [][] matrix = new boolean[8][8];

void setup() {
  size(400, 400);
}

void draw() {
  background(0, 0, 0);
  stroke(0, 255, 0);

  for (int y = 0; y < 8; ++y) {
    for (int x = 0; x < 8; ++x) {
      if (matrix[y][x] == true) {
        fill(0, 255, 0);
      } else {
        fill(0, 0, 0);
      }
      rect(x * w, y * w, w, w);
    }
  }
}

void mousePressed() {
  int x = (int)(mouseX / w);
  int y = (int)(mouseY / w);

  matrix[y][x] = !matrix[y][x];
}

void keyPressed() {
  if (key == 0x20) {
    dump();
  }
  else if (key == 'c') {
    clear();
  }
}

void dump() {
  for (int y = 0; y < 8; ++y) {
    String str = "B";
    for (int x = 0; x < 8; ++x) {
      if (matrix[y][x] == true) {
        str += "1";
      } else {
        str += "0";
      }
    }
    print(str + ",");
  }
  println();
}

void clear() {
  for (int y = 0; y < 8; ++y) {
    for (int x = 0; x < 8; ++x) {
      matrix[y][x] = false;
    }
  }
}