Fix broken redraw code, implement player sprites (some) and get ready for interactable objects.

player.lua

@@ -90,15 +90,42 @@ function draw_player()
    -- todo: animate the character on move
 
    -- draw the player's HUD
-   if fget(mget(player_pos_x, player_pos_y), 1) then
-      -- flag 1 represents an interactable (read: destructible) sprite.
-      -- need a map of destructible map objects, appropriate sfx, replacement
-      -- sprites.
+   local interact_x, interact_y = can_interact()
+   if interact_x and interact_y then
+      spr(119, 0, 120)
    end
 
    -- todo: introduce the concept of an inventory here
 end
 
+-- uses global variables instead of arguments
+-- returns x,y for the map-local coordinates of the interactable object
+-- nil,nil if nothing to interact with
+function can_interact()
+   -- flag 1 represents an interactable (read: destructible) sprite.
+   -- need a map of destructible map objects, appropriate sfx, replacement
+   -- sprites.
+   local player_rel_x, player_rel_y = player_pos_x+8, player_pos_y+8
+
+   -- check the tile the player is standing on
+   if fget(mget(player_rel_x, player_rel_y), 1) then
+      return player_rel_x, player_rel_y
+   end
+
+   -- check the tile the player is facing
+   faced_tile_x, faced_tile_y = get_position_facing()
+   if fget(mget(faced_tile_x, faced_tile_y), 1) then
+      return faced_tile_x, faced_tile_y
+   end
+
+   return nil, nil
+end
+
+-- returns x,y representing the map-local position the player is facing.
+function get_position_facing()
+   return camera_pos_x+8+facing_h, camera_pos_y+8+facing_v
+end
+
 -- pos is camera position, meaning the map-relative player
 -- position is pos + {8, 8}.
 function legal_move(pos_x, pos_y)