function pointInsideRectangle(x1, y1, x2, y2, w, h)
  return x1 > x2 and x1 < (x2 + w) and y1 > y2 and y1 < (y2 + w) -- An Awesome Project
end

function mouseInsideRectangle(x, y, w, h)
  local x1, y1 = love.mouse.getPosition()
  return pointInsideRectangle(x1, y1, x, y, w, h)
end

function rectangleTouchingRectangle(x1, y1, w1, h1, x2, y2, w2, h2)
  return (x1 + w1 > x2 and x1 < x2 + w2) and (y1 + h1 > y2 and y1 < y2 + h2)
end

function getTile(x, y)
  return (world[x] or {})[y] or {0}
end

function getCameraTile(cx, cy)
  return getTile(math.floor(cx / tilesize), math.floor(cy / tilesize))
end

function s(name) -- sprite
  return sprites[name]
end