Lua api to get avatar screen position

4 files changed, 53 insertions, 1 deletions

diff --git a/indra/newview/llagentlistener.cpp b/indra/newview/llagentlistener.cpp
index f6029e7297..9255a850e5 100644
--- a/indra/newview/llagentlistener.cpp
+++ b/indra/newview/llagentlistener.cpp
@@ -49,7 +49,7 @@
 #include "llsdutil_math.h"
 #include "lltoolgrab.h"
 #include "llhudeffectlookat.h"
-#include "llagentcamera.h"
+#include "llviewercamera.h"
 #include "resultset.h"
 #include <functional>
 
@@ -199,6 +199,13 @@ LLAgentListener::LLAgentListener(LLAgent &agent)
         "reply contains \"result\" table with \"id\", \"global_pos\", \"region_pos\" fields",
         &LLAgentListener::getNearbyObjectsList,
         llsd::map("reply", LLSD()));
+
+    add("getAgentScreenPos",
+        "Return screen position of the [\"avatar_id\"] avatar or own avatar if not specified\n"
+        "reply contains \"x\", \"y\" coordinates and \"onscreen\" flag to indicate if it's actually in within the current window\n"
+        "avatar render position is used as the point",
+        &LLAgentListener::getAgentScreenPos,
+        llsd::map("reply", LLSD()));
 }
 
 void LLAgentListener::requestTeleport(LLSD const & event_data) const
@@ -810,3 +817,30 @@ void LLAgentListener::getNearbyObjectsList(LLSD const& event_data)
     }
     response["result"] = objresult->getKeyLength();
 }
+
+void LLAgentListener::getAgentScreenPos(LLSD const& event_data)
+{
+    Response response(LLSD(), event_data);
+    LLVector3 render_pos;
+    if (event_data.has("avatar_id"))
+    {
+        LLUUID avatar_id(event_data["avatar_id"]);
+        for (LLCharacter* character : LLCharacter::sInstances)
+        {
+            LLVOAvatar* avatar = (LLVOAvatar*)character;
+            if (!avatar->isDead() && (avatar->getID() == avatar_id))
+            {
+                render_pos = avatar->getRenderPosition();
+                break;
+            }
+        }
+    }
+    else if (gAgentAvatarp.notNull() && gAgentAvatarp->isValid())
+    {
+        render_pos = gAgentAvatarp->getRenderPosition();
+    }
+    LLCoordGL screen_pos;
+    response["onscreen"] = LLViewerCamera::getInstance()->projectPosAgentToScreen(render_pos, screen_pos, false);
+    response["x"] = screen_pos.mX;
+    response["y"] = screen_pos.mY;
+}
diff --git a/indra/newview/llagentlistener.h b/indra/newview/llagentlistener.h
index f1e85f0923..8801c9f7ea 100644
--- a/indra/newview/llagentlistener.h
+++ b/indra/newview/llagentlistener.h
@@ -70,6 +70,7 @@ private:
     void getID(LLSD const& event_data);
     void getNearbyAvatarsList(LLSD const& event_data);
     void getNearbyObjectsList(LLSD const& event_data);
+    void getAgentScreenPos(LLSD const& event_data);
 
     LLViewerObject * findObjectClosestTo( const LLVector3 & position, bool sit_target = false ) const;
 
diff --git a/indra/newview/scripts/lua/require/LLAgent.lua b/indra/newview/scripts/lua/require/LLAgent.lua
index 70f3cdfffb..b2be69dcdf 100644
--- a/indra/newview/scripts/lua/require/LLAgent.lua
+++ b/indra/newview/scripts/lua/require/LLAgent.lua
@@ -131,6 +131,15 @@ function LLAgent.getNearbyObjectsList(...)
     return result(leap.request('LLAgent', args))
 end
 
+-- Get screen position of your own avatar or any other (if "avatar_id is specified)
+-- reply contains "x", "y" coordinates and "onscreen" flag to indicate if it's actually in within the current window
+-- avatar render position is used as the point
+function LLAgent.getAgentScreenPos(...)
+    local args = mapargs('avatar_id', ...)
+    args.op = 'getAgentScreenPos'
+    return leap.request('LLAgent', args)
+end
+
 -- ***************************************************************************
 --  Autopilot
 -- ***************************************************************************
diff --git a/indra/newview/scripts/lua/test_screen_position.lua b/indra/newview/scripts/lua/test_screen_position.lua
new file mode 100644
index 0000000000..94d57339b1
--- /dev/null
+++ b/indra/newview/scripts/lua/test_screen_position.lua
@@ -0,0 +1,8 @@
+LLAgent = require 'LLAgent'
+
+local screen_pos = LLAgent.getAgentScreenPos()
+if screen_pos.onscreen then
+  print("Avatar screen coordinates X: " .. screen_pos.x .. " Y: " .. screen_pos.y)
+else
+  print("Avatar is not on the screen")
+end