From 7d559cbae9c713e15ae0c943a4d571122bf29bc6 Mon Sep 17 00:00:00 2001
From: Philipp Sehmisch <tmw@crushnet.org>
Date: Tue, 6 May 2008 18:49:04 +0000
Subject: Implemented script trigger areas which call a script function when an
 object steps into them.

---
 ChangeLog                   |  8 ++++++++
 data/test.lua               | 16 +++++++++++++++
 src/game-server/trigger.cpp | 13 ++++++++++++
 src/game-server/trigger.hpp | 15 ++++++++++++++
 src/scripting/lua.cpp       | 50 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 102 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index e0a959f2..5474c763 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2008-05-06  Philipp Sehmisch  <tmw@crushnet.org>
+
+	* src/game-server/trigger.cpp, src/game-server/trigger.h,
+	src/scripting/lua.cpp: Implemented script trigger areas which call a
+	script function when an object steps into them.
+	* data/test.lua: Used script trigger areas to send all objects which
+	step into one of the areas onto a patrol path.
+
 2008-05-03  Philipp Sehmisch  <tmw@crushnet.org>
 
 	* data/test.lua, data/scripts/libtmw.lua, data/scripts/npclib.lua: Added
diff --git a/data/test.lua b/data/test.lua
index 4b14261e..0edc15e3 100644
--- a/data/test.lua
+++ b/data/test.lua
@@ -22,8 +22,24 @@ atinit(function()
   create_npc(201, 51 * 32 + 16, 25 * 32 + 16, npc4_talk, npclib.walkaround_wide)
   create_npc(126, 45 * 32 + 16, 25 * 32 + 16, npc5_talk, npclib.walkaround_map)
   create_npc(122, 58 * 32 + 16, 15 * 32 + 16, npc6_talk, nil)
+  
+  create_npc(200, 63 * 32 + 16, 31 * 32 + 16, nil, nil)
+  tmw.trigger_create(56 * 32, 30 * 32, 64, 64, "patrol_waypoint", 1)
+  tmw.trigger_create(63 * 32, 30 * 32, 64, 64, "patrol_waypoint", 2)
+  
 end)
 
+
+function patrol_waypoint(obj, id)
+	if (id == 1) then
+		tmw.being_walk(obj, 64 * 32, 31 * 32, 400)
+	end
+	if (id == 2) then
+		tmw.being_walk(obj, 57 * 32, 31 * 32, 400)
+	end
+end
+
+
 function npc1_talk(npc, ch)
   do_message(npc, ch, "Hello! I am the testing NPC.")
   do_message(npc, ch, "This message is just here for testing intertwined connections.")
diff --git a/src/game-server/trigger.cpp b/src/game-server/trigger.cpp
index c0c9bd85..3309c754 100644
--- a/src/game-server/trigger.cpp
+++ b/src/game-server/trigger.cpp
@@ -28,6 +28,8 @@
 #include "game-server/movingobject.hpp"
 #include "game-server/state.hpp"
 
+#include "utils/logger.h"
+
 void WarpAction::process(Object *obj)
 {
     if (obj->getType() == OBJECT_CHARACTER)
@@ -36,6 +38,17 @@ void WarpAction::process(Object *obj)
     }
 }
 
+void ScriptAction::process(Object *obj)
+{
+    LOG_DEBUG("Script trigger area activated: "<<mFunction<<"("<<obj<<", "<<mArg<<")");
+    if (!mScript) return;
+    if (mFunction == "") return;
+    mScript->prepare(mFunction);
+    mScript->push(obj);
+    mScript->push(mArg);
+    mScript->execute();
+}
+
 void TriggerArea::update()
 {
     for (MovingObjectIterator i(getMap()->getInsideRectangleIterator(mZone)); i; ++i)
diff --git a/src/game-server/trigger.hpp b/src/game-server/trigger.hpp
index d6e4d2c9..3ca52fba 100644
--- a/src/game-server/trigger.hpp
+++ b/src/game-server/trigger.hpp
@@ -26,6 +26,7 @@
 
 #include "point.h"
 #include "game-server/thing.hpp"
+#include "scripting/script.hpp"
 
 class Object;
 
@@ -49,6 +50,20 @@ class WarpAction : public TriggerAction
         unsigned short mX, mY;
 };
 
+class ScriptAction : public TriggerAction
+{
+    public:
+        ScriptAction(Script *script, std::string function, int arg)
+          : mScript(script), mFunction(function), mArg(arg) {}
+
+        virtual void process(Object *obj);
+
+    private:
+        Script *mScript;        //Script object to be called
+        std::string mFunction;  //Name of the function called in the script object
+        int mArg;               //Argument passed to script function (meaning is function-specific)
+};
+
 class TriggerArea : public Thing
 {
     public:
diff --git a/src/scripting/lua.cpp b/src/scripting/lua.cpp
index 46463dfc..62fd64a4 100644
--- a/src/scripting/lua.cpp
+++ b/src/scripting/lua.cpp
@@ -41,6 +41,7 @@ extern "C" {
 #include "game-server/npc.hpp"
 #include "game-server/quest.hpp"
 #include "game-server/state.hpp"
+#include "game-server/trigger.hpp"
 #include "net/messageout.hpp"
 #include "scripting/script.hpp"
 #include "utils/logger.h"
@@ -547,6 +548,54 @@ static int LuaChr_SetQuest(lua_State *s)
     return 0;
 }
 
+/**
+ * Creates a trigger area. Whenever an object enters this area
+ * a Lua function is called.
+ * tmw.trigger_create (x, y, width, height, function, id)
+ */
+static int LuaTrigger_Create(lua_State *s)
+{
+    //TODO: argument check
+    if (!lua_isnumber(s, 1) ||
+        !lua_isnumber(s, 2) ||
+        !lua_isnumber(s, 3) ||
+        !lua_isnumber(s, 4) ||
+        !lua_isstring(s, 5) ||
+        !lua_isnumber(s, 6))
+    {
+        raiseScriptError(s, "trigger_create called with incorrect parameters.");
+        return 0;
+    }
+
+    lua_pushlightuserdata(s, (void *)&registryKey);
+    lua_gettable(s, LUA_REGISTRYINDEX);
+    Script *script = static_cast<Script *>(lua_touserdata(s, -1));
+    int x = lua_tointeger(s, 1);
+    int y = lua_tointeger(s, 2);
+    int width = lua_tointeger(s, 3);
+    int height = lua_tointeger(s, 4);
+    std::string function = lua_tostring(s, 5);
+    int id = lua_tointeger(s, 6);
+
+    LOG_INFO("Created script trigger at "<<x<<":"<<y<<" ("<<width<<"x"<<height<<") function: "<<function<<" ("<<id<<")");
+
+    MapComposite *m = script->getMap();
+
+    if (!m)
+    {
+        raiseScriptError(s, "trigger_create called for nonexistent a map.");
+        return 0;
+    }
+
+    ScriptAction *action = new ScriptAction(script, function, id);
+    Rectangle r = { x, y, width, height };
+    TriggerArea *area = new TriggerArea(m, r, action);
+
+    bool ret = GameState::insert(area);
+    lua_pushboolean(s, ret);
+    return 1;
+}
+
 LuaScript::LuaScript():
     nbArgs(-1)
 {
@@ -568,6 +617,7 @@ LuaScript::LuaScript():
         { "being_walk",       &LuaBeing_Walk      },
         { "posX",             &LuaPosX            },
         { "posY",             &LuaPosY            },
+        { "trigger_create",   &LuaTrigger_Create  },
         { NULL, NULL }
     };
     luaL_register(mState, "tmw", callbacks);
-- 
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