Worms no longer get stuck

src/core/states/game.lua

@@ -109,6 +109,9 @@ function Game:enter()
 
     self.enemies = {
         Siren.new(self),
+        Worm.new(self),
+        Worm.new(self),
+        Worm.new(self),
         Worm.new(self)
     }
 

src/entities/enemies/worm.lua

@@ -27,18 +27,12 @@ function Worm.new(game)
 
     self.isEnemy = true
     self.tail = {}
-    local startingPos = self:_findSpawnPoint()
-    table.insert(self.tail, { startingPos.x, startingPos.y })
-    self.game.world:add(self.tail[1], startingPos.x, startingPos.y, self.size.w, self.size.h)
-
-    self.nextDirections = self:_findOpenDirections()
-    if #self.nextDirections > 0 then
-        self.forwardDirection = lume.randomchoice(self.nextDirections)
-    end
 
     self.timer = Timer.new()
     self.timerHandles = {}
 
+    self:_spawn()
+
     return self
 end
 
@@ -82,6 +76,8 @@ function Worm:draw()
     -- love.graphics.circle('fill', cx, cy, 4)
 end
 
+--
+
 function Worm:getCenter()
     local headX, headY = unpack(self.tail[1])
     return headX + (self.size.w / 2), headY + (self.size.h / 2)
@@ -89,6 +85,8 @@ end
 
 function Worm:getSize() return self.size.w, self.size.h end
 
+--
+
 function Worm:_startMoving()
     self.timerHandles.move = self.timer:every(self.stats.moveDelay, function() self:_move() end)
 end
@@ -97,6 +95,41 @@ function Worm:_stopMoving()
     self.timer:cancel(self.timerHandles.move)
 end
 
+--
+
+function Worm:_spawn()
+    assert(#self.tail == 0, 'Cannot spawn worm when tail length is non-zero. Got ' .. #self.tail)
+
+    local startingPos = self:_findSpawnPoint()
+    table.insert(self.tail, { startingPos.x, startingPos.y })
+    self.game.world:add(self.tail[1], startingPos.x, startingPos.y, self.size.w, self.size.h)
+
+    self.nextDirections = self:_findOpenDirections()
+    if #self.nextDirections > 0 then
+        self.forwardDirection = lume.randomchoice(self.nextDirections)
+    end
+end
+
+function Worm:_burrow()
+    assert(#self.tail > 0, 'Cannot burrow worm when tail length is zero.')
+
+    self.isBurrowing = true
+
+    -- Remove tail
+    if #self.tail > 0 then
+        self.game.world:remove(self.tail[#self.tail])
+        table.remove(self.tail)
+    end
+
+    -- Done burrowing
+    if #self.tail == 0 then
+        self.isBurrowing = false
+        self:_spawn()
+    end
+end
+
+--
+
 function Worm:_findSpawnPoint()
     local pos = random.chooseUntil(self.game.env.nodes, function(element)
         local distanceToPlayer = vector.dist(element.x, element.y, self.game.player:getPos())
@@ -130,7 +163,7 @@ end
 function Worm:_move()
     self.nextDirections = self:_findOpenDirections()
 
-    if #self.nextDirections > 0 then
+    if #self.nextDirections > 0 and not self.isBurrowing then
         self.forwardDirection = lume.randomchoice(self.nextDirections)
         local dx, dy = unpack(self.forwardDirection)
 
@@ -144,7 +177,15 @@ function Worm:_move()
 
         table.insert(self.tail, 1, { newHeadX, newHeadY })
         self.game.world:add(self.tail[1], newHeadX, newHeadY, self.size.w, self.size.h)
+    else
+        self:_burrow()
     end
 end
 
+--
+
+function Worm:_checkIsStuck()
+
+end
+
 return Worm

todo.md

@@ -17,7 +17,6 @@
 
 # in progress
 
-- [ ] Let the worm get out of dead ends
 - [ ] Create scarecrow enemy
   - [ ] Make an entity that can wander the maze
   - [ ] Stop when the player is near
@@ -43,3 +42,4 @@
   - [x] Make an entity that can wander the maze
   - [x] Add trailing body segments
   - [x] Add wall collision to the body
+- [x] Let the worm get out of dead ends