gistfile1.js

// the spritesheet is ready
function loaded() 
{
  console.log('Spritesheet loaded.');
  spritesheetLoaded = true;
  createWorld();
}

// fill the world with walls
function createWorld()
{
  console.log('Creating world...');
  
  // create emptiness
  for (var x=0; x < worldWidth; x++)
  {
    world[x] = [];
    
    for (var y=0; y < worldHeight; y++)
    {
      world[x][y] = 0;
    }
  }
  
  // scatter some walls
  for (var x=0; x < worldWidth; x++)
  {
    for (var y=0; y < worldHeight; y++)
    {
      if (Math.random() > 0.75)
        world[x][y] = 1;
    }
  }
  
  // calculate initial possible path
  // note: unlikely but possible to never find one...
  currentPath = [];
  while (currentPath.length == 0) 
  {
    pathStart = [Math.floor(Math.random()*worldWidth),Math.floor(Math.random()*worldHeight)];
    pathEnd = [Math.floor(Math.random()*worldWidth),Math.floor(Math.random()*worldHeight)];
    if (world[pathStart[0]][pathStart[1]] == 0)
      currentPath = findPath(world,pathStart,pathEnd,'Manhattan');
  }
  redraw();
  
}