Sudoku - OpenProcessing

mySketch
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var cw = 40;
var ch = 40;
var ox = 0;
var oy = 0;
​
var selx = 0;
var sely = 0;
​
mat = []
for (var y=0; y<9; y++) {
  mat.push([]);
  for (var x=0; x<9; x++) {
    mat[y].push([1,2,3,4,5,6,7,8,9])  
  }
}
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  ox = windowWidth/2 - cw*4.5;
  oy = windowHeight/2 - ch*4.5;
  rectMode(CORNERS);
  textAlign(CENTER);
  textSize(10);
  frameRate(30);
}
​
function draw() {
  background(255);
  mx = floor((mouseX-ox)/cw)
  my = floor((mouseY-oy)/ch)
  
  for (var y=0; y<9; y++) {
    for (var x=0; x<9; x++) {
      push()
      if (selx == x && sely == y) fill(200);
      cx = ox+x*cw;
      cy = oy+y*ch;
      rect(cx, cy, cx+cw, cy+ch);
      pop();
      text(formatCellText(x,y), cx+cw/2, cy+ch*0.3);
    }
  }
  
  push();
  strokeWeight(3);
  fill(0,0,0,0);
  for (var y=0; y<3; y++) {
    for (var x=0; x<3; x++) {
      var sx = ox + x*3*cw;
      var sy = oy + y*3*ch;
      rect(sx, sy, sx+3*cw, sy+3*ch);
    }
  }
  pop();
}
​
function keyPressed() {
  if (keyCode >= 49 && keyCode <= 57) {
    n = keyCode - 48;$
    updateCell(selx,sely,n);
  } else if (keyCode == 37) {
    selx -= 1
  } else if (keyCode == 38) {
    sely -= 1
  } else if (keyCode == 39) {
    selx += 1
  } else if (keyCode == 40) {
    sely += 1
  } else if (keyCode == 32) {
    checkGrid();
  }
}
​
function formatCellText(x,y) {
  var arr = mat[y][x]
  var s = "";
  var i = 0;
  for (var n of arr) {
    s += n.toString() + " ";
    i += 1;
    if (i == 3) {
      s += "\n";
      i = 0;
    }
  }
  return s
}
​
function checkGrid() {
  checkSquares();
  checkRows();
  checkColumns();
}
​
function checkRows() {
  for (var y=0; y<9; y++) {
    var possibles = [[],[],[],[],[],[],[],[],[]];
    for (var x=0; x<9; x++) {
      for (var n of mat[y][x]) possibles[n-1].push(x);
    }
    for (var k=0; k<9; k++) {
      var arr = possibles[k];
      if (arr.length == 1) updateCell(arr[0],y,k+1);
    }
  }
}
​
function checkColumns() {
  for (var x=0; x<9; x++) {
    var possibles = [[],[],[],[],[],[],[],[],[]];
    for (var y=0; y<9; y++) {
      for (var n of mat[y][x]) possibles[n-1].push(y);
    }
    for (var k=0; k<9; k++) {
      var arr = possibles[k];
      if (arr.length == 1) updateCell(x,arr[0],k+1);
    }
  }
}
​
function checkSquares() {
  for (var i=0;i<3;i++) {
    for (var j=0;j<3;j++) {
      sx = 3*i;
      sy = 3*j;
      checkSquare(sx,sy);
    }
  }
}
​
function checkSquare(sx, sy) {
  var possibles = [[],[],[],[],[],[],[],[],[]];
  for(var i=0; i<9; i++) {
    var x = sx + i%3;
    var y = sy + Math.floor(i/3);
    for (var n of mat[y][x]) possibles[n-1].push(i);
  }
  for (var k=0; k<9; k++) {
    var arr = possibles[k];
    if (arr.length == 1) {
      var i = arr[0]
      var x = sx + i%3;
      var y = sy + Math.floor(i/3);
      updateCell(x,y,k+1);
    }
  }
​
}
​
function removeNumberFromColumn(n,x) {
  for(var y=0; y<9; y++) {
    removeNumberFromCell(x,y,n);
  }
}
​
function removeNumberFromRow(n,y) {
  for(var x=0; x<9; x++) {
    removeNumberFromCell(x,y,n);
  }
}
​
function removeNumberFromSquare(sx,sy,n) {
  for (var x=0; x<3; x++) {
    for (var y=0; y<3; y++) {
      removeNumberFromCell(sx+x, sy+y, n);
    }
  }
}
​
function removeNumberFromCell(x, y, n) {
  var arr = mat[y][x];
  if (arr.length == 1) return;
  if (arr.includes(n)) {
    index = arr.indexOf(n);
    if (index != -1) arr.splice(index,1);
  }
  if (arr.length == 1) updateCell(x,y,arr[0])
}
​
function updateCell(x,y,n) {
  mat[y][x] = [n];
  sx = Math.floor(x/3)*3;
  sy = Math.floor(y/3)*3;
  removeNumberFromColumn(n,x);
  removeNumberFromRow(n,y);
  removeNumberFromSquare(sx,sy,n);
}