bugfix and slide animation

- bugfix for hook swing not taking in consideration the length of rope
- bugfix for player hitbox size
- bugfix for fairy flight control system FCS
- added slide animation for wall slide and wall jump

code/entity.lua

@@ -38,21 +38,29 @@ end
 function Entity:checkNearest(type,maxdistance)
 	local return_entity = nil
 	local shortest = -1
+	local flag_variable_distance = false
+
+	if maxdistance == "hook_specific" then
+		flag_variable_distance = true
+	end
+
 	for _, entity in pairs(LoadedObjects.Entities) do
 		if not type or entity.type == type then
 			local distance_x = entity.pos.x - self.pos.x
 			local distance_y = entity.pos.y - self.pos.y
 			local distance = math.sqrt(distance_x ^ 2 + distance_y ^ 2)
 
-			if maxdistance == "hook_specific" then maxdistance = entity.hook_distance end
+			if flag_variable_distance then
+				maxdistance = entity.hook_distance
+			end
 
 			if not maxdistance or distance < maxdistance then
 				if shortest == -1 or distance < shortest then
 					shortest = distance
 					return_entity = entity
 				end
+				print(shortest,maxdistance,distance)
 			end
-
 		end
 	end
 	return return_entity
@@ -67,20 +75,19 @@ function Entity:move()
 end
 
 function Entity:moveWithCollision()
-	local r = false
+	-- horizontal collision
 	if not self:isCollidingAt(self.pos.x + self.vel.x, self.pos.y, LoadedObjects.Collisions) then
 		self.pos.x = self.pos.x + self.vel.x
 	else
 		self.vel.x = 0
-		r = true
 	end
+
+	-- vertical collision
 	if not self:isCollidingAt(self.pos.x, self.pos.y + self.vel.y, LoadedObjects.Collisions) then
 		self.pos.y = self.pos.y + self.vel.y
 	else
 		self.vel.y = 0
-		r = true
 	end
-	return r
 end
 
 function Entity:adjustLight(x,y)
@@ -136,6 +143,7 @@ function Entity:checkVisionLine(entity,range)
 end
 
 function Entity:draw(animation)
+	if animation == nil then return end
 	local c1, c2, c3, a = love.graphics.getColor()
 	love.graphics.setColor(self.sprite_tint[1],self.sprite_tint[2],self.sprite_tint[3],self.sprite_alpha)
 	animation:draw(
@@ -149,6 +157,7 @@ function Entity:draw(animation)
 end
 
 function Entity:centerOffset(animation,x,y)
+	if animation == nil then return end
 	local x = x or 0
 	local y = y or 0
 	self.sprite_offset.x = animation.imgs[1]:getWidth()/2 + x
@@ -156,6 +165,7 @@ function Entity:centerOffset(animation,x,y)
 end
 
 function Entity:createBox(animation,top,left,bottom,right)
+	if animation == nil then return end
 	local left = left or 0
 	local right = right or 0
 	local top = top or 0