[ADD] Add something, commit before debugging

maidroid_core_basic/register.lua

@@ -3,16 +3,56 @@
 -- https://github.com/tacigar/maidroid
 ------------------------------------------------------------
 
-local function on_start(self)
+local state = {
+	IDLE      = 0,
+	ACCOMPANY = 1,
+}
 
+local function on_start(self)
+	self.state = state.IDLE
+	self.object:setacceleration{x = 0, y = -10, z = 0}
+	self.object:setvelocity{x = 0, y = 0, z = 0}
 end
 
 local function on_stop(self)
-
+	self.state = nil
+	self.object:setvelocty{x = 0, y = 0, z = 0}
 end
 
 local function on_step(self, dtime)
+	local player = self:get_nearest_player(10)
+	if player == nil then
+		self:set_animation(maidroid.animation_frames.STAND)
+		return
+	end
 
+	local position = self.object:getpos()
+	local player_position = player:getpos()
+	local direction = vector.subtract(player_position, position)
+	local velocity = self.object:getvelocity()
+
+	if vector.length(dir) < 3 then
+		if self.state == state.ACCOMPANY then
+			self:set_animation(maidroid.animation_frames.STAND)
+			self.state = state.idle
+			self.object:setvelocity{x = 0, y = velocity.y, z = 0}
+		end
+	else
+		if self.state == state.IDLE then
+			self:set_animation(maidroid.animation_frames.WALK)
+			self.state = state.ACCOMPANY
+		end
+		self.object:setvelocity{x = direction.x, y = velocity.y, z = direction.z} -- TODO
+	end
+	self:set_yaw_by_direction(direction)
+
+	-- if maidroid is stoped by obstacle, the maidroid must jump.
+	if velocity == 0 and self.state = state.ACCOMPANY then
+		local front_node = self:get_front_node()
+		if front_node.name ~= "air" then
+			self.object:setvelocity{x = direction.x, y = 3, z = direction.z}
+		end
+	end
 end
 
 maidroid.register_core("maidroid_core_basic:core_basic", {