start using happy_weather_api, fix #8 sky reseting issue

light_rain.lua

@@ -0,0 +1,165 @@
+------------------------------ 
+-- Happy Weather: Light Rain
+
+-- License: MIT
+
+-- Credits: xeranas
+------------------------------
+
+local light_rain = {}
+light_rain.last_check = 0
+light_rain.check_interval = 300
+
+-- Weather identification code
+light_rain.code = "light_rain"
+
+-- Keeps sound handler references 
+local sound_handlers = {}
+
+-- Manual triggers flags
+local manual_trigger_start = false
+local manual_trigger_end = false
+
+-- Skycolor layer id
+local SKYCOLOR_LAYER = "happy_weather_light_rain_sky"
+
+light_rain.is_starting = function(dtime, position)
+	if light_rain.last_check + light_rain.check_interval < os.time() then
+		light_rain.last_check = os.time()
+		if math.random() < 0.2 then
+			return true
+		end
+	end
+
+	if manual_trigger_start then
+		manual_trigger_start = false
+		return true
+	end
+
+	return false
+end
+
+light_rain.is_ending = function(dtime)
+	if light_rain.last_check + light_rain.check_interval < os.time() then
+		light_rain.last_check = os.time()
+		if math.random() < 0.4 then
+			return true
+		end
+	end
+
+	if manual_trigger_end then
+		manual_trigger_end = false
+		return true
+	end
+
+	return false
+end
+
+local set_sky_box = function(player_name)
+	local sl = {}
+	sl.layer_type = skylayer.SKY_PLAIN
+	sl.name = SKYCOLOR_LAYER
+	sl.data = {gradient_data={}}
+	sl.data.gradient_data.colors = {
+		{r=0, g=0, b=0},
+		{r=85, g=86, b=98},
+		{r=152, g=150, b=159},
+		{r=85, g=86, b=98},
+		{r=0, g=0, b=0}
+	}
+	skylayer.add_layer(player_name, sl)
+end
+
+local set_rain_sound = function(player) 
+	return minetest.sound_play("light_rain_drop", {
+		object = player,
+		max_hear_distance = 2,
+		loop = true,
+	})
+end
+
+local remove_rain_sound = function(player)
+	local sound = sound_handlers[player:get_player_name()]
+	if sound ~= nil then
+		minetest.sound_stop(sound)
+		sound_handlers[player:get_player_name()] = nil
+  	end
+end
+
+light_rain.add_player = function(player)
+	sound_handlers[player:get_player_name()] = set_rain_sound(player)
+	set_sky_box(player:get_player_name())
+end
+
+light_rain.remove_player = function(player)
+	remove_rain_sound(player)
+	skylayer.remove_layer(player:get_player_name(), SKYCOLOR_LAYER)
+end
+
+-- Random texture getter
+local choice_random_rain_drop_texture = function()
+	local texture_name
+	local random_number = math.random()
+	if random_number > 0.33 then
+		texture_name = "happy_weather_light_rain_raindrop_1.png"
+	elseif random_number > 0.66 then
+		texture_name = "happy_weather_light_rain_raindrop_2.png"
+	else
+		texture_name = "happy_weather_light_rain_raindrop_3.png"
+	end
+	return texture_name;
+end
+
+local add_rain_particle = function(player)
+	local offset = {
+		front = 5,
+		back = 2,
+		top = 4
+	}
+
+	local random_pos = hw_utils.get_random_pos(player, offset)
+
+	if hw_utils.is_outdoor(random_pos) then
+		minetest.add_particle({
+		  pos = {x=random_pos.x, y=random_pos.y, z=random_pos.z},
+		  velocity = {x=0, y=-10, z=0},
+		  acceleration = {x=0, y=-30, z=0},
+		  expirationtime = 2,
+		  size = math.random(0.5, 3),
+		  collisiondetection = true,
+		  collision_removal = true,
+		  vertical = true,
+		  texture = choice_random_rain_drop_texture(),
+		  playername = player:get_player_name()
+		})
+	end
+end
+
+local display_rain_particles = function(player)
+	if hw_utils.is_underwater(player) then
+		return
+	end
+
+	add_rain_particle(player)
+end
+
+light_rain.in_area = function(position)
+	if position.y > -10 then
+		return true
+	end
+	return false
+end
+
+light_rain.render = function(dtime, player)
+	display_rain_particles(player)
+end
+
+light_rain.start = function()
+	manual_trigger_start = true
+end
+
+light_rain.stop = function()
+	manual_trigger_end = true
+end
+
+happy_weather.register_weather(light_rain)