var tmpPath = path.join(dirPath, x + "*" + y + ".png");
var tmpCanvas = new Canvas(chunk_size.width,chunk_size.height);
var tmpCtx = canvas.getContext('2d');
if (!fs.existsSync(tmpPath))
{

}
else
{
    s.readFile(tmpPath, function(err, squid){
        if (err) throw err;
        img = new Image;
        img.src = squid;
        ctx.drawImage(img, 0, 0, img.width / 4, img.height / 4);
    });
}