sliceGeneratorBits

Jimp.read(asset,function(err,lenna){
    if(err) throw err;

    assets[assetName] = lenna;

    if(Object.keys(assets).length == assetsToLoad.length){
        generateMapFiles();
    }
});

const image = assets[mapToProcess].clone();

image.crop(
    (cropx-1)*tilewidth,
    (cropy-1)*tileheight,
    tilewidth*sliceSize,
    tileheight*sliceSize
)
.composite(assets['hud_party'],compositeX,compositeY);

//append directions party can walk from here
if(isWalkable(x,y-1)) image.composite(assets['hud_up'],compositeX,compositeY);
if(isWalkable(x-1,y)) image.composite(assets['hud_left'],compositeX,compositeY);
if(isWalkable(x,y+1)) image.composite(assets['hud_down'],compositeX,compositeY);
if(isWalkable(x+1,y)) image.composite(assets['hud_right'],compositeX,compositeY);

image.write(subdir2+x+'-'+y+'.png');