Isometric Tiles in Lua

tiles.lua

-- Drawing the map as isometric tiles
  self.tilesHovered = {} -- Reset the tilesHovered table every frame
  for i = 1, #self.map do -- Loop trough rows
    for j = 1, #self.map[i] do -- Loop through cols in the rows
      if self.map[i][j] ~= 0 then -- If there is a tile to draw

        local x =
          self.x + -- Starting point
          (j * ((self.tileWidth / 2) * self.scale)) - -- The width on rows
          (i * ((self.tileWidth / 2) * self.scale)) -- The width on cols
        local y =
          self.y +
          (i * ((self.tileHeight / 4) * self.scale)) + -- The height on rows
          (j * ((self.tileHeight / 4) * self.scale)) -- The width on cols
        -- Take the height map into account
        local y = y - self.mapheight[i][j] * 8
        -- Draw the tiles
        love.graphics.draw(self.tilesheet, self.tiles[self.map[i][j]],
          x, y,
          0,
          self.scale,
          self.scale
        )

        if self.tmx > x and -- Hitbox between mouse and tile
        self.tmx < x + self.tileWidth * self.scale and
        self.tmy > y + self.tileHeight / 2 and
        self.tmy < y + self.tileHeight * self.scale then
          -- Add the tile to tiles hovered, if mouse is on top of it
          table.insert(self.tilesHovered, {i, j, x, y})

        end

      end
    end
  end

Scale is just some value used to scale the images in size (e.g. a 32x32px image being drawn as 64x64px)
Map and Mapheight should be tables with values 1 .. n as entries, where n are the amount of quads in self.tiles.
Line 25-30 is just collision between mouse and the tiles.