use moveresult, add switcharoo effect

README.md

@@ -7,6 +7,7 @@ https://forum.minetest.net/viewtopic.php?f=9&t=9234
 
 Change log:
 
+- 1.5 - Use moveresult when throwing teleport potion, has switcharoo effect
 - 1.4 - Change Pad texture so it's not as contrasting, check for attached player before tp.
 - 1.3 - Added some formspec checks and switch to enable old teleport pad texture (thanks mazes 80)
 - 1.2 - New teleport pad texture, code tweaks to work with minetest 5.x

init.lua

@@ -40,16 +40,14 @@ local function check_coordinates(str)
 	-- check coords
 	if x == nil or string.len(x) > 6
 	or y == nil or string.len(y) > 6
-	or z == nil or string.len(z) > 6 then
+	or z == nil or string.len(z) > 6 then return end
-		return nil
-	end
 
 	-- convert string coords to numbers
 	x = tonumber(x) ; y = tonumber(y) ; z = tonumber(z)
 
 	-- are coords in map range ?
 	if x > dist or x < -dist or y > dist or y < -dist or z > dist or z < -dist then
-		return nil
+		return
 	end
 
 	-- return ok coords
@@ -141,12 +139,14 @@ core.register_node("teleport_potion:portal", {
 
 local function throw_potion(itemstack, player)
 
-	local playerpos = player:get_pos()
+	local pos = player:get_pos()
+	local prop = player:get_properties()
+	local y_off = prop.eye_height or 1.5
 
 	local obj = core.add_entity({
-		x = playerpos.x,
+		x = pos.x,
-		y = playerpos.y + 1.5,
+		y = pos.y + y_off,
-		z = playerpos.z
+		z = pos.z
 	}, "teleport_potion:potion_entity")
 
 	local dir = player:get_look_dir()
@@ -163,68 +163,52 @@ end
 local potion_entity = {
 
 	initial_properties = {
-		physical = true,
+		physical = true, static_save = false, pointable = false,
 		visual = "sprite",
 		visual_size = {x = 1.0, y = 1.0},
 		textures = {"teleport_potion_potion.png"},
-		collisionbox = {-0.1,-0.1,-0.1,0.1,0.1,0.1},
+		collisionbox = {-0.2,-0.2,-0.2,0.2,0.2,0.2},
 	},
-	lastpos = {},
 	player = ""
 }
 
-potion_entity.on_step = function(self, dtime)
+potion_entity.on_step = function(self, dtime, moveresult)
 
-	if not self.player then
+	if not self.player or self.player == "" then
-
+		self.object:remove() ; return
-		self.object:remove()
-
-		return
 	end
 
-	local pos = self.object:get_pos()
+	if moveresult.collides then
-
-	if self.lastpos.x ~= nil then
-
-		local vel = self.object:get_velocity()
-
-		-- only when potion hits something physical
-		if vel.x == 0 or vel.y == 0 or vel.z == 0 then
-
-			if self.player ~= "" then
 
 		-- round up coords to fix glitching through doors
-				self.lastpos = vector.round(self.lastpos)
+		local pos = vector.round(self.object:get_pos())
-
 		local oldpos = self.player:get_pos()
 
+		-- if we hit a player or mob then switch positions
+		local def = moveresult.collisions and moveresult.collisions[1]
+
+		if def.object then
+			def.object:set_pos(oldpos)
+		end
+
 		-- play sound and disappearing particle effect at current position
 		core.sound_play("portal_close", {
-						pos = oldpos, gain = 1.0, max_hear_distance = 5}, true)
+				pos = oldpos, gain = 1.0, max_hear_distance = 7}, true)
-
-				oldpos.y = oldpos.y + 1
 
 		effect(oldpos, 25, "teleport_potion_particle.png", 2, 2, 1, -10, 15)
 
 		-- teleport to new position, play sound and show appear effect
-				self.player:set_pos(self.lastpos)
+		self.player:set_pos(pos)
 
 		core.sound_play("portal_close", {
-						pos = self.lastpos, gain = 1.0, max_hear_distance = 5}, true)
+				pos = pos, gain = 1.0, max_hear_distance = 7}, true)
 
-				effect(self.lastpos, 20, "teleport_potion_particle.png", 2, 2, 1, 10, 15)
+		effect(pos, 20, "teleport_potion_particle.png", 2, 2, 1, 10, 15)
-			end
 
 		self.object:remove()
-
-			return
-
 	end
 end
 
-	self.lastpos = pos
-end
-
 core.register_entity("teleport_potion:potion_entity", potion_entity)
 
 --- Teleport potion