​

let button_reset, button_step, button_step1, button_step2;

let input_writeV, input_writeI, input_writeJ, button_write;

​

function newGrid(){

  let g = [];

  for(let i = 0; i < rows; i++){

    g[i] = [];

    for(let j = 0; j < cols; j++){

      g[i][j] = 0;

    }

  }return g;

}

​

function reset(){

  grid = newGrid();

  objects  = [[5, 2, 2], /*[0, 1, 2],*/ [-3, 2, 1], [-3, 2, 3], [-3, 3, 2]];

}

​

function step1(){

  let tgrid = grid.slice().map(x => x.slice());

  for(let i = 0; i < rows; i++){

    for(let j = 0; j < cols; j++){

      let n = neighbors(i, j), x = grid[i][j];

      let y = floor(x / n.length), z = x % n.length;

      if(y > 0){

        tgrid[i][j] = z;

        n.forEach(c => tgrid[c[0]][c[1]] += y);

      }if(z > 0){

        tgrid[i][j] -= z;

        let c = random(n);

        tgrid[c[0]][c[1]] += z;

      }

    }

  }

  grid = tgrid;

}

​

function step2(){

  objects.forEach(x => {

    grid[x[1]][x[2]] = max(0, grid[x[1]][x[2]] + x[0]);

  });

}

​

function step(){

  step1(); step2();

}

​

function neighbors(i, j){

  let n = [];

  if(i > 0)        n.push([i - 1, j    ]);

  if(i < rows - 1) n.push([i + 1, j    ]);

  if(j > 0)        n.push([i,     j - 1]);

  if(j < cols - 1) n.push([i,     j + 1]);

  return n;

}

​

function setup() {

  createCanvas(400, 400);

  createP();

  button_reset = createButton("Reset");

  button_reset.mousePressed(reset);

  button_step = createButton("Step");

  button_step.mousePressed(step);

  button_step = createButton("Step1");

  button_step.mousePressed(step1);

  button_step = createButton("Step2");

  button_step.mousePressed(step2);

  createP();

  input_writeV = createInput("");

  input_writeV.attribute("placeholder", "Value");

  input_writeV.id("_input_writeV");

  input_writeI = createInput("");

  input_writeI.attribute("placeholder", "Row");

  input_writeI.id("_input_writeI");

  input_writeJ = createInput("");

  input_writeJ.attribute("placeholder", "Column");

  input_writeJ.id("_input_writeJ");

  button_write = createButton("Write");

  button_write.mousePressed(()=>{

    grid[_input_writeI.value][_input_writeJ.value] = _input_writeV.value;

    _input_writeV.value = _input_writeI.value = _input_writeJ.value = "";

  });

  reset();

}

​

function draw() {

  background(220);

  textSize(28);

  for(let i = 0; i < rows; i++){

    for(let j = 0; j < cols; j++){

      text(grid[i][j] + "", (j+1/2) * width/cols, (i+1/2) * height/rows);

    }

  }

  objects.forEach(x => {

    text(x[0] > 0 ? "+".repeat(abs(x[0])) : "-".repeat(abs(x[0])), (x[2]+1/4) * width/cols, (x[1]+1/3) * height/rows);

  });

}

​

//function mousePressed(){

//  

//}