Add pickQuad method to spriteAtlas for random quad selection

lib/level/procedural.lua

@@ -8,8 +8,7 @@ local function new(template, size)
         local tileMap = require("lib.utils.sprite_atlas").load(Tree.assets.files.tiles.grass)
         for y = 0, size.y - 1 do
             for x = 0, size.x - 1 do
-                local type = tileMap.map["flower_grass"]
-                local tile = require('lib.level.tile').new { quad = type[math.random(1, #type)], atlas = tileMap.atlas }
+                local tile = require('lib.level.tile').new { quad = tileMap:pickQuad("flower_grass"), atlas = tileMap.atlas }
                     :copyWith({ position = Vec3 { x, y } })
                 map[tostring(tile.position)] = tile
             end

lib/utils/sprite_atlas.lua

@@ -52,4 +52,18 @@ local function load(path)
     return setmetatable(_spriteAtlas, spriteAtlas)
 end
 
+--- Returns a random quad of the group
+---
+--- @param tag string
+--- @return love.Quad
+function spriteAtlas:pickQuad(tag)
+    local group = self.map[tag]
+    if group then
+        return group[math.random(1, #group)]
+    end
+
+    print("[SpriteAtlas]: no tile with a tag '" .. tag .. "'")
+    return love.graphics.newQuad(0, 0, self.tileSize, self.tileSize, self.atlas) --fallback
+end
+
 return { load = load }