load map image into map data

two_player_cleaning_game/map-util.fnl

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+(local name "travis")
+
+(local levels [
+  {:image-path "assets/level_002.png" :walls []}
+])
+
+; "20 x 20 array with the outter edge set to 1 (walls) and the inner edge set to 0 (floor)"
+(local empty-level
+  (let [level []]
+        (for [y 0 19 1] (table.insert level [])) ; empty rows
+        (each [y row (ipairs level)]
+          (for [x 0 19 1] (table.insert row 0)))
+        level
+    )
+)
+
+(lambda load-walls [level]
+  (let [image-data (love.image.newImageData (. level :image-path))]
+  (each [y row (ipairs (. level :walls))]
+    (each [x wall (ipairs row)]
+      (let [(r g b) (image-data:getPixel (- x 1) (- y 1))]
+        ; (print (.. x "," y " -> " r "," g "," b))
+        (tset row x (if (= (.. r g b) "111") 0 1)))))))
+
+(fn load []
+  "load levels"
+  (each [_ level (pairs levels)]
+    (tset level :walls empty-level)
+    (load-walls level))
+  ; (print (fennel.view levels))
+  )
+
+{
+  :load load
+  :levels levels
+}