gistfile1.txt

if (!state.initialized) {
  state.cur = 0;
  state.dir = 1;
  state.initialized = true;
  state.last_update = false;
  state.val = 1;
  state.chaser = false;
}

//1:1,2:1,3:1,4:1,4:2,4:3,4:4,4:3,4:2,4:1,3:1,2:1,2:2,2:3,3:3,3:2
//0,1,2,3,7,11,15,14,13,12,8,4,5,6,10,9

// This was going to build the pattern array, but the 
// server stopped responding.. so.. 
function createPatternArray(row_count, col_count) {
  var row_wall = 0,
    col_wall = 0,
    cur = 0,
    dots = row_count * col_count;    
}

var now = (time / 100) | 0,
  pattern = [0, 1, 2, 3, 7, 11, 15, 14, 13, 12, 8, 4, 5, 6, 10, 9];

if (state.last_update == now) {
  return;
}

// You can uncomment this to have the lights stay lit
for (var i=0; i < rows*columns; i++) {
  grid[i] = 0;
}

// If you want a chaser, you can uncomment this to 
// place a dot behind the lead dot.
//
// if (state.cur > 3) {
//   state.chaser = state.cur - 3;
// }
//
// if (state.chaser) {
//   grid[pattern[state.chaser]] = state.val;
// }

grid[pattern[state.cur]] = state.val;

state.cur = state.cur + state.dir;

if (pattern.length < (state.cur + state.dir)) {
  state.dir = -1;
  state.val = 1;
} else if (state.cur < 0) {
  state.dir = 1;
  state.val = 1;
  state.cur = 0;
}

state.last_update = now;