pause menu

.gitignore

@@ -1,2 +1,3 @@
 bin/
+.DS_Store
 log.txt

color.lua

@@ -6,7 +6,7 @@ COLORS = {
     -- tones
     WHITE               = vec4(0.8, 0.8, 0.7, 1),
     BLACK               = vec4(0, 0, 0.02, 1),
-    VERY_DARK_GRAY      = vec4(45/255, 45/255, 35/255, 1),
+    VERY_DARK_GRAY      = vec4(35/255, 35/255, 25/255, 1),
     TRUE_BLACK          = vec4(0, 0, 0, 1),
 
     -- non-standard hues

main.lua

@@ -5,6 +5,7 @@ math.random()
 math.random()
 math.random()
 
+
 -- Globals
 WIN = am.window{
     width       = 1920,
@@ -14,7 +15,9 @@ WIN = am.window{
     letterbox   = true
 }
 
--- assets/non-or-trivial code
+STATE = {} -- @TODO move state in here
+
+-- assets and/or trivial code
 require "color"
 require "sound"
 require "texture"
@@ -24,7 +27,7 @@ require "src/extra"
 require "src/geometry"
 require "src/hexyz"
 require "src/grid"
-WIN.clear_color = color_at(0)
+require "src/gui"
 require "src/mob"
 require "src/projectile"
 require "src/tower"
@@ -36,6 +39,8 @@ PERF_STATS = false               -- result of am.perf_stats() -- should be calle
 WORLD = false -- root scene node of everything considered to be in the game world
               -- aka non gui stuff
 
+HEX_CURSOR = false
+
 TIME           = 0                  -- runtime of the current game in seconds (not whole program runtime)
 SCORE          = 0                  -- score of the player
 STARTING_MONEY = 50
@@ -89,6 +94,7 @@ local function game_action(scene)
 
     do_entity_updates()
     do_mob_spawning()
+    do_gui_updates()
 
     if WIN:mouse_pressed"left" then
         if hot and can_do_build(hex, tile, SELECTED_TOWER_TYPE) then
@@ -96,23 +102,29 @@ local function game_action(scene)
         end
     end
 
+    --[[
     if WIN:mouse_pressed"middle" then
-        WIN.scene"scale".scale2d = vec2(1)
+        WORLD"scale".scale2d = vec2(1)
     else
-        local mwd = vec2(WIN:mouse_wheel_delta().y / 1000)
-        WIN.scene"scale".scale2d = WIN.scene"scale".scale2d + mwd
-        WIN.scene"scale".scale2d = WIN.scene"scale".scale2d + mwd
+        local mwd = vec2(WIN:mouse_wheel_delta().y / 500)
+        WORLD"scale".scale2d = WORLD"scale".scale2d + mwd
+        WORLD"scale".scale2d = WORLD"scale".scale2d + mwd
     end
+    ]]
 
     if WIN:key_pressed"escape" then
         WIN.scene"game".paused = true
+        WIN.scene:append(am.group{
+            am.rect(WIN.left, WIN.bottom, WIN.right, WIN.top, COLORS.TRANSPARENT),
+            am.scale(3) ^ am.text("Paused.\nEscape to Resume", COLORS.BLACK)
+        }:tag"pause_menu")
         WIN.scene:action(function()
             if WIN:key_pressed"escape" then
+                WIN.scene:remove"pause_menu"
                 WIN.scene"game".paused = false
                 return true
             end
         end)
-        --game_end()
 
     elseif WIN:key_pressed"f1" then
         TRDT = (TRDT + 1) % #table.keys(TRDTS)
@@ -143,9 +155,9 @@ local function game_action(scene)
     end
 
     if tile and hot then
-        WIN.scene"hex_cursor".center = rounded_mouse
+        HEX_CURSOR.center = rounded_mouse
     else
-        WIN.scene"hex_cursor".center = OFF_SCREEN
+        HEX_CURSOR.center = OFF_SCREEN
     end
 
     WIN.scene"score".text = string.format("SCORE: %.2f", SCORE)
@@ -197,113 +209,22 @@ function game_end()
     WIN.scene = am.group(am.scale(1) ^ game_scene())
 end
 
-function update_score(diff)
-    SCORE = SCORE + diff
-end
-
-function update_money(diff)
-    MONEY = MONEY + diff
-end
-
-function get_tower_tooltip_text(tower_type)
-    return string.format(
-        "%s\n%s\n%s\ncost: %d"
-      , get_tower_name(tower_type)
-      , get_tower_placement_rules_text(tower_type)
-      , get_tower_short_description(tower_type)
-      , get_tower_base_cost(tower_type)
-    )
-end
+function update_score(diff) SCORE = SCORE + diff end
+function update_money(diff) MONEY = MONEY + diff end
 
-local function toolbelt()
-    -- init the toolbelt
-    local toolbelt_height = hex_height(HEX_SIZE) * 2
-    local toolbelt = am.group{
-        am.translate(WIN.left + 10, WIN.bottom + toolbelt_height + 20)
-        ^ am.text(get_tower_tooltip_text(SELECTED_TOWER_TYPE), "left", "bottom"):tag"tower_tooltip",
-        am.rect(WIN.left, WIN.bottom, WIN.right, WIN.bottom + toolbelt_height, COLORS.TRANSPARENT)
-    }:tag"toolbelt"
-
-    local padding = 15
-    local size = toolbelt_height - padding
-    local half_size = size/2
-    local offset = vec2(WIN.left + padding*3, WIN.bottom + padding/3)
-    local tab_button = am.translate(vec2(0, half_size) + offset) ^ am.group{
-        pack_texture_into_sprite(TEXTURES.WIDER_BUTTON1, 54, 32),
-        pack_texture_into_sprite(TEXTURES.TAB_ICON, 25, 25)
-    }
-    toolbelt:append(tab_button)
-    local tower_select_square = (
-        am.translate(vec2(size + padding, half_size) + offset)
-        ^ am.rect(-size/2-3, -size/2-3, size/2+3, size/2+3, COLORS.SUNRAY)
-    ):tag"tower_select_square"
-    toolbelt:append(tower_select_square)
-
-    -- fill in the other tower options
-    local tower_type_values = {
-        TOWER_TYPE.REDEYE,
-        TOWER_TYPE.LIGHTHOUSE,
-        TOWER_TYPE.WALL,
-        TOWER_TYPE.MOAT
-    }
-    local keys = { '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=' }
-    for i = 1, #keys do
-        if tower_type_values[i] then
-            toolbelt:append(
-                am.translate(vec2(size + padding, 0) * i + offset)
-                ^ am.group{
-                    am.translate(0, half_size)
-                    ^ pack_texture_into_sprite(TEXTURES.BUTTON1, size, size),
-
-                    am.translate(0, half_size)
-                    ^ pack_texture_into_sprite(get_tower_texture(tower_type_values[i]), size, size),
-
-                    am.translate(vec2(half_size))
-                    ^ am.group{
-                        pack_texture_into_sprite(TEXTURES.BUTTON1, half_size, half_size),
-                        am.scale(2)
-                        ^ am.text(keys[i], COLORS.BLACK)
-                    }
-                }
-            )
-        else
-            toolbelt:append(
-                am.translate(vec2(size + padding, 0) * i + offset)
-                ^ am.group{
-                    am.translate(0, half_size)
-                    ^ pack_texture_into_sprite(TEXTURES.BUTTON1, size, size),
-
-                    am.translate(vec2(half_size))
-                    ^ am.group{
-                        pack_texture_into_sprite(TEXTURES.BUTTON1, half_size, half_size),
-                        am.scale(2)
-                        ^ am.text(keys[i], COLORS.BLACK)
-                    }
-                }
-            )
-        end
+function draw_hex_cursor(map, color)
+    local group = am.group()
+    for _,h in pairs(map) do
+        group:append(am.circle(hex_to_pixel(h), HEX_SIZE, color, 6))
     end
-
-    select_tower_type = function(tower_type)
-        SELECTED_TOWER_TYPE = tower_type
-        if TOWER_SPECS[SELECTED_TOWER_TYPE] then
-            WIN.scene"tower_tooltip".text = get_tower_tooltip_text(tower_type)
-            local new_position = vec2((size + padding) * tower_type, size/2) + offset
-            WIN.scene"tower_select_square":action(am.tween(0.1, { position2d = new_position }))
-
-            WIN.scene:action(am.play(am.sfxr_synth(SOUNDS.SELECT1), false, 1, SFX_VOLUME))
-        end
-    end
-
-    return toolbelt
+    return group
 end
 
--- @NOTE must be global to allow the game_action to reference it
 function game_scene()
     local score = am.translate(WIN.left + 10, WIN.top - 20) ^ am.text("", "left"):tag"score"
     local money = am.translate(WIN.left + 10, WIN.top - 40) ^ am.text("", "left"):tag"money"
     local coords = am.translate(WIN.right - 10, WIN.top - 20) ^ am.text("", "right", "top"):tag"coords"
-    local hex_cursor = am.circle(OFF_SCREEN, HEX_SIZE, COLORS.TRANSPARENT, 6):tag"hex_cursor"
+    HEX_CURSOR = am.circle(OFF_SCREEN, HEX_SIZE, COLORS.TRANSPARENT, 6):tag"hex_cursor"
 
     local curtain = am.rect(WIN.left, WIN.bottom, WIN.right, WIN.top, COLORS.TRUE_BLACK)
     curtain:action(coroutine.create(function()
@@ -317,7 +238,7 @@ function game_scene()
     local scene = am.group{
         WORLD,
         curtain,
-        hex_cursor,
+        HEX_CURSOR,
         toolbelt(),
         score,
         money,
@@ -330,6 +251,6 @@ function game_scene()
     return scene
 end
 
-WIN.scene = am.group(am.scale(vec2(1)) ^ game_scene())
+WIN.scene = am.group(game_scene())
 noglobals()
 

src/entity.lua

@@ -1,9 +1,5 @@
 
 
-MOBS = {}
-TOWERS = {}
-PROJECTILES = {}
-
 --[[
 entity structure:
 {
@@ -12,6 +8,8 @@ entity structure:
     position        - vec2      - current pixel position of it's translate (forced parent) node
     update          - function  - runs every frame with itself and its index as an argument
     node            - node      - scene graph node
+
+    ...             - any       - a bunch of other shit depending on what entity type it is
 }
 --]]
 function make_basic_entity(hex, node, update, position)
@@ -51,34 +49,14 @@ function delete_entity(t, index)
 end
 
 function delete_all_entities()
-    for mob_index,mob in pairs(MOBS) do
-        if mob then delete_entity(MOBS, mob_index) end
-    end
-    for tower_index,tower in pairs(TOWERS) do
-        if tower then delete_entity(TOWERS, tower_index) end
-    end
-    for projectile_index,projectile in pairs(PROJECTILES) do
-        if projectile then delete_entity(PROJECTILES, projectile_index) end
-    end
+    delete_all_mobs()
+    delete_all_towers()
+    delete_all_projetiles()
 end
 
 function do_entity_updates()
-    --if WIN:key_down"space" then
-    for mob_index,mob in pairs(MOBS) do
-        if mob and mob.update then
-            mob.update(mob, mob_index)
-        end
-    end
-    for tower_index,tower in pairs(TOWERS) do
-        if tower and tower.update then
-            tower.update(tower, tower_index)
-        end
-    end
-    for projectile_index,projectile in pairs(PROJECTILES) do
-        if projectile and projectile.update then
-            projectile.update(projectile, projectile_index)
-        end
-    end
-    --end
+    do_mob_updates()
+    do_tower_updates()
+    do_projectile_updates()
 end
 

src/grid.lua

@@ -7,8 +7,8 @@ HEX_PIXEL_WIDTH = hex_width(HEX_SIZE, ORIENTATION.FLAT)
 HEX_PIXEL_HEIGHT = hex_height(HEX_SIZE, ORIENTATION.FLAT)
 HEX_PIXEL_DIMENSIONS = vec2(HEX_PIXEL_WIDTH, HEX_PIXEL_HEIGHT)
 
--- with 1920x1080, this is the minimal dimensions to cover the screen (65x33)
--- @NOTE added 2 cell padding, because we terraform the very outer edge and it looks ugly
+-- with 1920x1080, the minimal dimensions to cover the screen is 65x33
+-- added 2 cell padding, because we terraform the very outer edge and it looks ugly, so hide it
 -- odd numbers are important because we want a 'true' center
 HEX_GRID_WIDTH = 67
 HEX_GRID_HEIGHT = 35
@@ -91,14 +91,9 @@ function grid_cost(map, from, to)
 end
 
 function generate_and_apply_flow_field(map, start, world)
-    local flow
-    if false then
-        flow = flow_field(map, start, world)
-    else
-        flow = dijkstra(map, start, nil, grid_cost)
-    end
+    local flow = dijkstra(map, start, nil, grid_cost)
 
-    local flow_field_hidden = world and world"flow_field" and world"flow_field".hidden
+    local flow_field_hidden = world and world"flow_field" and world"flow_field".hidden or true
     if world and world"flow_field" then
         world:remove"flow_field"
     end
@@ -112,8 +107,7 @@ function generate_and_apply_flow_field(map, start, world)
                 overlay_group:append(am.translate(hex_to_pixel(vec2(i, j)))
                                      ^ am.text(string.format("%.1f", f.priority * 10)))
             else
-                -- should fire exactly once per goal hex
-                -- log('no priority')
+                -- should fire exactly once
             end
         end
     end
@@ -134,6 +128,7 @@ function random_map(seed)
 
     -- the world's appearance relies largely on a backdrop which can be scaled in
     -- tone to give the appearance of light or darkness
+    -- @NOTE replace this with a shader program
     local neg_mask = am.rect(0, 0, HEX_GRID_PIXEL_WIDTH, HEX_GRID_PIXEL_HEIGHT, COLORS.TRUE_BLACK):tag"negative_mask"
 
     local world = am.group(neg_mask):tag"world"
@@ -180,7 +175,7 @@ function random_map(seed)
     getmetatable(map).__index.neighbours = function(hex)
         return table.filter(hex_neighbours(hex), function(_hex)
             local tile = map.get(_hex.x, _hex.y)
-            return tile and tile.elevation > -0.5 and tile.elevation <= 0.5
+            return tile and tile_is_medium_elevation(tile)
         end)
     end
 

src/gui.lua

@@ -12,8 +12,8 @@ function set_hot(id)
     if not active then hot = { id = id } end
 end
 
-function register_button_widget(id, rect)
-    register_widget(id, function()
+function register_button_widget(id, rect, onclick)
+    register_widget(id, function(i)
         local click = false
 
         if active and active.id == id then
@@ -27,23 +27,107 @@ function register_button_widget(id, rect)
 
         if point_in_rect(WIN:mouse_position(), rect) then set_hot(id) end
 
-        return click
+        if click then onclick() end
     end)
 end
 
-function make_button_widget(id, position, dimensions, text)
-    local rect = am.rect(
-        -dimensions.x/2,
-        dimensions.y/2,
-        dimensions.x/2,
-        -dimensions.y/2,
-        vec4(1, 0, 0, 1)
-    )
+function do_gui_updates()
+    for i,w in pairs(widgets) do
+        w.poll(i)
+    end
+end
 
-    register_button_widget(id, rect)
-    return am.group{
-        rect,
-        am.text(text)
-    }:tag(id)
+local function get_tower_tooltip_text(tower_type)
+    return string.format(
+        "%s\n%s\n%s\ncost: %d"
+      , get_tower_name(tower_type)
+      , get_tower_placement_rules_text(tower_type)
+      , get_tower_short_description(tower_type)
+      , get_tower_base_cost(tower_type)
+    )
 end
 
+function toolbelt()
+    local function button(size, half_size, tower_texture, padding, i, offset, key_name)
+        local x1 = (size + padding) * i + offset.x
+        local y1 = offset.y
+        local x2 = (size + padding) * i + offset.x + size
+        local y2 = offset.y + size
+
+        register_button_widget("toolbelt_tower_button" .. i, am.rect(x1, y1, x2, y2), function() select_tower_type(i) end)
+
+        return am.translate(vec2(size + padding, 0) * i + offset)
+            ^ am.group{
+                am.translate(0, half_size)
+                ^ pack_texture_into_sprite(TEXTURES.BUTTON1, size, size),
+
+                am.translate(0, half_size)
+                ^ pack_texture_into_sprite(tower_texture, size, size),
+
+                am.translate(vec2(half_size))
+                ^ am.group{
+                    pack_texture_into_sprite(TEXTURES.BUTTON1, half_size, half_size),
+                    am.scale(2)
+                    ^ am.text(key_name, COLORS.BLACK)
+                }
+            }
+    end
+
+    -- init the toolbelt
+    local toolbelt_height = hex_height(HEX_SIZE) * 2
+    local toolbelt = am.group{
+        am.translate(WIN.left + 10, WIN.bottom + toolbelt_height + 20)
+        ^ am.text(get_tower_tooltip_text(SELECTED_TOWER_TYPE), "left", "bottom"):tag"tower_tooltip",
+        am.rect(WIN.left, WIN.bottom, WIN.right, WIN.bottom + toolbelt_height, COLORS.TRANSPARENT)
+    }:tag"toolbelt"
+
+    local padding = 15
+    local size = toolbelt_height - padding
+    local half_size = size/2
+    local offset = vec2(WIN.left + padding*3, WIN.bottom + padding/3)
+    local tab_button = am.translate(vec2(0, half_size) + offset) ^ am.group{
+        pack_texture_into_sprite(TEXTURES.WIDER_BUTTON1, 54, 32),
+        pack_texture_into_sprite(TEXTURES.TAB_ICON, 25, 25)
+    }
+    toolbelt:append(tab_button)
+    local tower_select_square = (
+        am.translate(vec2(size + padding, half_size) + offset)
+        ^ am.rect(-size/2-3, -size/2-3, size/2+3, size/2+3, COLORS.SUNRAY)
+    ):tag"tower_select_square"
+    toolbelt:append(tower_select_square)
+
+    -- fill in the other tower options
+    local tower_type_values = {
+        TOWER_TYPE.REDEYE,
+        TOWER_TYPE.LIGHTHOUSE,
+        TOWER_TYPE.WALL,
+        TOWER_TYPE.MOAT
+    }
+    local keys = { '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=' }
+    for i = 1, #keys do
+        toolbelt:append(
+            button(
+                size,
+                half_size,
+                get_tower_texture(tower_type_values[i]),
+                padding,
+                i,
+                offset,
+                keys[i]
+            )
+        )
+    end
+
+    select_tower_type = function(tower_type)
+        SELECTED_TOWER_TYPE = tower_type
+        if TOWER_SPECS[SELECTED_TOWER_TYPE] then
+            WIN.scene"tower_tooltip".text = get_tower_tooltip_text(tower_type)
+            local new_position = vec2((size + padding) * tower_type, size/2) + offset
+            WIN.scene"tower_select_square":action(am.tween(0.1, { position2d = new_position }))
+
+            WIN.scene:action(am.play(am.sfxr_synth(SOUNDS.SELECT1), false, 1, SFX_VOLUME))
+        end
+    end
+
+    return toolbelt
+end

src/mob.lua

@@ -1,14 +1,6 @@
 
 
---[[
-mob(entity) structure:
-{
-    path            - 2d table  - map of hexes to other hexes, forms a path
-    speed           - number    - multiplier on distance travelled per frame, up to the update function to use correctly
-    bounty          - number    - score bonus you get when this mob is killed
-    hurtbox_radius  - number    -
-}
---]]
+MOBS = {}
 
 MAX_MOB_SIZE = hex_height(HEX_SIZE, ORIENTATION.FLAT) / 2
 MOB_SIZE = MAX_MOB_SIZE
@@ -33,7 +25,7 @@ end
 -- check if a the tile at |hex| is passable by |mob|
 function mob_can_pass_through(mob, hex)
     local tile = HEX_MAP.get(hex.x, hex.y)
-    return tile and tile.elevation <= 0.5 and tile.elevation > -0.5
+    return tile and tile_is_medium_elevation(tile)
 end
 
 function mob_die(mob, mob_index)
@@ -143,12 +135,6 @@ local function update_mob(mob, mob_index)
 
     if mob.frame_target and mob.frame_target == last_frame_hex then
         --log('backpedaling')
-        -- backpedaling or failing to find anywhere to go, run Astar and hope it works
-        --local made_it
-        --mob.path, made_it = Astar(HEX_MAP, mob.hex, HEX_GRID_CENTER, grid_heuristic, grid_cost)
-        --if not made_it then
-        --    log('stuck!')
-        --end
     end
 
     -- do movement
@@ -187,7 +173,7 @@ local function make_and_register_mob(mob_type)
     register_entity(MOBS, mob)
 end
 
-local SPAWN_CHANCE = 25
+local SPAWN_CHANCE = 45
 function do_mob_spawning()
     --if WIN:key_pressed"space" then
     if math.random(SPAWN_CHANCE) == 1 then
@@ -196,3 +182,17 @@ function do_mob_spawning()
     end
 end
 
+function delete_all_mobs()
+    for mob_index,mob in pairs(MOBS) do
+        if mob then delete_entity(MOBS, mob_index) end
+    end
+end
+
+function do_mob_updates()
+    for mob_index,mob in pairs(MOBS) do
+        if mob and mob.update then
+            mob.update(mob, mob_index)
+        end
+    end
+end
+

src/projectile.lua

@@ -1,16 +1,8 @@
 
 
---[[
-bullet/projectile(entity) structure
-{
-    vector          - vec2      - normalized vector of the current direction of this projectile
-    velocity        - number    - multplier on distance travelled per frame
-    damage          - number    - guess
-    hitbox_radius   - number    - hitboxes are circles
-}
---]]
+PROJECTILES = {}
 
-function update_projectile(projectile, projectile_index)
+local function update_projectile(projectile, projectile_index)
     projectile.position        = projectile.position + projectile.vector * projectile.velocity
     projectile.node.position2d = projectile.position
     projectile.hex             = pixel_to_hex(projectile.position)
@@ -80,3 +72,17 @@ function make_and_register_projectile(hex, vector, velocity, damage, hitbox_radi
     register_entity(PROJECTILES, projectile)
 end
 
+function delete_all_projectiles()
+    for projectile_index,projectile in pairs(PROJECTILES) do
+        if projectile then delete_entity(PROJECTILES, projectile_index) end
+    end
+end
+
+function do_projectile_updates()
+    for projectile_index,projectile in pairs(PROJECTILES) do
+        if projectile and projectile.update then
+            projectile.update(projectile, projectile_index)
+        end
+    end
+end
+

src/tower.lua

@@ -1,5 +1,7 @@
 
 
+TOWERS = {}
+
 TOWER_TYPE = {
     REDEYE     = 1,
     LIGHTHOUSE = 2,
@@ -72,6 +74,34 @@ local function make_tower_sprite(tower_type)
     return pack_texture_into_sprite(get_tower_texture(tower_type), HEX_PIXEL_WIDTH, HEX_PIXEL_HEIGHT)
 end
 
+local function make_tower_node(tower_type)
+    if tower_type == TOWER_TYPE.REDEYE then
+        return make_tower_sprite(tower_type)
+
+    elseif tower_type == TOWER_TYPE.LIGHTHOUSE then
+        return am.group(
+            make_tower_sprite(tower_type)
+        )
+    elseif tower_type == TOWER_TYPE.WALL then
+        return am.circle(vec2(0), HEX_SIZE, COLORS.VERY_DARK_GRAY, 6)
+
+    elseif tower_type == TOWER_TYPE.MOAT then
+        return am.circle(vec2(0), HEX_SIZE, (COLORS.WATER){a=1}, 6)
+
+    end
+end
+
+function towers_on_hex(hex)
+    local t = {}
+    for tower_index,tower in pairs(TOWERS) do
+        if tower and tower.hex == hex then
+            table.insert(t, tower_index, tower)
+        end
+    end
+    return t
+end
+
+
 function tower_on_hex(hex)
     return table.find(TOWERS, function(tower)
         return tower.hex == hex
@@ -81,9 +111,24 @@ end
 function tower_is_buildable_on(hex, tile, tower_type)
     if hex == HEX_GRID_CENTER then return false end
 
-    local blocked = tower_on_hex(hex) or #mobs_on_hex(hex) ~= 0
+    local blocking_towers       = towers_on_hex(hex)
+    local blocking_mobs         = mobs_on_hex(hex)
+
+    local towers_blocking       = #blocking_towers ~= 0
+    local mobs_blocking         = #blocking_mobs ~= 0
+
+    local blocked = mobs_blocking or towers_blocking
 
     if tower_type == TOWER_TYPE.REDEYE then
+        if not mobs_blocking and towers_blocking then
+            blocked = false
+            for _,tower in pairs(TOWERS) do
+                if tower.type ~= TOWER_TYPE.WALL then
+                    blocked = true
+                    break
+                end
+            end
+        end
         return not blocked and tile.elevation > 0.5
 
     elseif tower_type == TOWER_TYPE.LIGHTHOUSE then
@@ -96,13 +141,13 @@ function tower_is_buildable_on(hex, tile, tower_type)
                 break
             end
         end
-        return not blocked and tile.elevation <= 0.5 and tile.elevation > -0.5 and has_water_neighbour
+        return not blocked and tile_is_medium_elevation(tile) and has_water_neighbour
 
     elseif tower_type == TOWER_TYPE.WALL then
-        return not blocked and tile.elevation <= 0.5 and tile.elevation > -0.5
+        return not blocked and tile_is_medium_elevation(tile)
 
     elseif tower_type == TOWER_TYPE.MOAT then
-        return not blocked and tile.elevation <= 0.5 and tile.elevation > -0.5
+        return not blocked and tile_is_medium_elevation(tile)
     end
 end
 
@@ -158,10 +203,11 @@ end
 function make_and_register_tower(hex, tower_type)
     local tower = make_basic_entity(
         hex,
-        make_tower_sprite(tower_type),
+        make_tower_node(tower_type),
         get_tower_update_function(tower_type)
     )
 
+    local need_to_regen_flow_field = true
     tower.type = tower_type
     if tower_type == TOWER_TYPE.REDEYE then
         tower.range          = 7
@@ -171,18 +217,46 @@ function make_and_register_tower(hex, tower_type)
         HEX_MAP[hex.x][hex.y].elevation = 2
 
     elseif tower_type == TOWER_TYPE.LIGHTHOUSE then
-        tower.range = 4
+        tower.range = 5
         tower.perimeter = ring_map(tower.hex, tower.range)
+        --[[
+        tower.node:append(
+            am.particles2d{
+                source_pos = vec2(0, 12),
+                source_pos_var = vec2(2),
+                start_size = 1,
+                start_size_var = 1,
+                end_size = 1,
+                end_size_var = 1,
+                angle = 0,
+                angle_var = math.pi,
+                speed = 1,
+                speed_var = 2,
+                life = 10,
+                life_var = 1,
+                start_color = COLORS.WHITE,
+                start_color_var = vec4(0.1, 0.1, 0.1, 1),
+                end_color = COLORS.SUNRAY,
+                end_color_var = vec4(0.1),
+                emission_rate = 4,
+                start_particles = 4,
+                max_particles = 200
+            }
+        )
+        ]]
+        -- @HACK
+        need_to_regen_flow_field = false
 
     elseif tower_type == TOWER_TYPE.WALL then
         HEX_MAP[hex.x][hex.y].elevation = 1
 
     elseif tower_type == TOWER_TYPE.MOAT then
-        HEX_MAP[hex.x][hex.y].elevation = 0
-
+        HEX_MAP[hex.x][hex.y].elevation = -1
     end
 
+    if need_to_regen_flow_field then
         generate_and_apply_flow_field(HEX_MAP, HEX_GRID_CENTER, WORLD)
+    end
 
     register_entity(TOWERS, tower)
 end
@@ -193,3 +267,17 @@ function build_tower(hex, tower_type)
     vplay_sfx(SOUNDS.EXPLOSION4)
 end
 
+function delete_all_towers()
+    for tower_index,tower in pairs(TOWERS) do
+        if tower then delete_entity(TOWERS, tower_index) end
+    end
+end
+
+function do_tower_updates()
+    for tower_index,tower in pairs(TOWERS) do
+        if tower and tower.update then
+            tower.update(tower, tower_index)
+        end
+    end
+end
+