evil-jrpg/font.lua

local Atlas = require "atlas"

---@class Font
---A set of character sprites that can be drawn as strings.
local Font = Atlas:extend()

---Creates a new font.
---@param image_path string The path to the source image for the atlas.
---@param sw integer The width of each sprite.
---@param sh integer The height of each sprite.
---@param characters string[] A list of characters with indices corresponding to each sprite.
function Font:new(image_path, sw, sh, characters)
  Font.super.new(self, image_path, sw, sh)

  ---A map of characters to sprites.
  self.characters = {}

  for sprite, ch in ipairs(characters) do
    if ch then
      self.characters[ch] = sprite
    end
  end
end

---Draws a string with this font.
function Font:draw(text, x, y)
  local x = x or 0
  local y = y or 0

  for i = 1, #text do
    local c = text:sub(i, i)
    local sprite = self.characters[c]
    if sprite then
      local x = (i - 1) * self.sw + x
      self.super.draw(self, sprite, x, y)
    end
  end
end

return Font