From cf64054390970f3cf974afb2b174340a3e1da382 Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Tue, 16 Jul 2019 14:00:42 +0200
Subject: Implement adding velocity to player from Lua

The intended usecase is knockback, but there's potential for more.
---
 src/script/lua_api/l_object.cpp | 22 ++++++++++++++++++++++
 src/script/lua_api/l_object.h   |  3 +++
 2 files changed, 25 insertions(+)

(limited to 'src/script')

diff --git a/src/script/lua_api/l_object.cpp b/src/script/lua_api/l_object.cpp
index 5dba63159..be2172f1b 100644
--- a/src/script/lua_api/l_object.cpp
+++ b/src/script/lua_api/l_object.cpp
@@ -1092,6 +1092,27 @@ int ObjectRef::l_get_player_velocity(lua_State *L)
 	return 1;
 }
 
+// add_player_velocity(self, {x=num, y=num, z=num})
+int ObjectRef::l_add_player_velocity(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	ObjectRef *ref = checkobject(L, 1);
+	v3f vel = checkFloatPos(L, 2);
+
+	RemotePlayer *player = getplayer(ref);
+	PlayerSAO *co = getplayersao(ref);
+	if (!player || !co)
+		return 0;
+
+	session_t peer_id = player->getPeerId();
+	if (peer_id == PEER_ID_INEXISTENT)
+		return 0;
+	// Do it
+	co->setMaxSpeedOverride(vel);
+	getServer(L)->SendPlayerSpeed(peer_id, vel);
+	return 0;
+}
+
 // get_look_dir(self)
 int ObjectRef::l_get_look_dir(lua_State *L)
 {
@@ -1931,6 +1952,7 @@ luaL_Reg ObjectRef::methods[] = {
 	luamethod(ObjectRef, is_player_connected),
 	luamethod(ObjectRef, get_player_name),
 	luamethod(ObjectRef, get_player_velocity),
+	luamethod(ObjectRef, add_player_velocity),
 	luamethod(ObjectRef, get_look_dir),
 	luamethod(ObjectRef, get_look_pitch),
 	luamethod(ObjectRef, get_look_yaw),
diff --git a/src/script/lua_api/l_object.h b/src/script/lua_api/l_object.h
index 653d833f6..2390c5195 100644
--- a/src/script/lua_api/l_object.h
+++ b/src/script/lua_api/l_object.h
@@ -212,6 +212,9 @@ private:
 	// get_player_velocity(self)
 	static int l_get_player_velocity(lua_State *L);
 
+	// add_player_velocity(self, {x=num, y=num, z=num})
+	static int l_add_player_velocity(lua_State *L);
+
 	// get_look_dir(self)
 	static int l_get_look_dir(lua_State *L);
 
-- 
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