js.html

<canvas id="myCanvas" width="400" height="300"></canvas>

<div onclick="clickHandler2();">Clicks Here</div>

<div onclick="clickHandler();">Random</div>


<script>
var mode = 0;
//Math.floor( Math.random() * 7 )
var destA = 7;
var destB = 6;
var startA = 1;
var startB = 1;
var SIZE = 20;
var X = 30;
var Y = 25;
var CELLS = X * Y;
var colors = ['#000000', '#1A0000', '#330000', '#4C0000', '#660000', '#800000',
 		          '#990000', '#B20000', '#CC0000', '#E60000', '#FF0000', '#FF1919',
              '#FF3333', '#FF4D4D', '#FF6666', '#FF8080', '#FF9999', '#FFB2B2', 
              '#FFCCCC'];


function makeGrid(x, y) {
  var grid = [];
  for(var i = 0; i < x; i++) {
    grid[i] = [];
    for(var j = 0; j < y; j++) {
      grid[i][j] = 0;
    }
  }
  return t;
}
  
var matrix = [];
for(var i = 0; i < X; i++) {
    matrix[i] = [];
    for(var j = 0; j < Y; j++) {
      if ((j + i) % 2 == 0) {
        matrix[i][j] = 1;
      }
      else {
        matrix[i][j] = 0;
      }
    }
}


function clickHandler2() {
  var canvas=document.getElementById('myCanvas');
  var ctx=canvas.getContext('2d');
  ctx.clearRect(0, 0, canvas.width, canvas.height);
 
  for(var i = 0; i < X; i++) {
    for(var j = 0; j < Y; j++) {
      var index = Math.floor( Math.random() * 18 )
      if (i == destA & j == destB) {
        ctx.fillStyle = '#00FF00'
      } else if (i == startA & j == startB) {
        ctx.fillStyle = '#FFFF00'
      } else if (matrix[i][j] == 1) {
        ctx.fillStyle = colors[index];
      } else {
        ctx.fillStyle = colors[index];
      }
      ctx.fillRect(i*SIZE, j*SIZE, SIZE, SIZE);
    }
  } 
    
}
</script>