From 8986c3488daaafe531882f67818f1baf2eac4ae3 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Wed, 12 Oct 2011 09:17:58 +0100
Subject: [PATCH] Make sun-angle a plain property, so observers fire.

---
 src/Time/light.cxx | 7 ++++---
 src/Time/light.hxx | 2 ++
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/Time/light.cxx b/src/Time/light.cxx
index 042919aee..e4e432e4c 100644
--- a/src/Time/light.cxx
+++ b/src/Time/light.cxx
@@ -148,8 +148,9 @@ void FGLight::bind () {
     prop->tie("/rendering/scene/scattering",SGRawValuePointer<float>(&_scattering));
     prop->tie("/rendering/scene/overcast",SGRawValuePointer<float>(&_overcast));
 
+    _sunAngleRad = prop->getNode("/sim/time/sun-angle-rad", true);
+  
     // Read Only
-    prop->tie("/sim/time/sun-angle-rad",SGRawValuePointer<double>(&_sun_angle));
     prop->tie("/rendering/scene/ambient/red",SGRawValuePointer<float>(&_scene_ambient[0]));
     prop->tie("/rendering/scene/ambient/green",SGRawValuePointer<float>(&_scene_ambient[1]));
     prop->tie("/rendering/scene/ambient/blue",SGRawValuePointer<float>(&_scene_ambient[2]));
@@ -181,8 +182,6 @@ void FGLight::unbind () {
     prop->untie("/rendering/scene/saturation");
     prop->untie("/rendering/scene/scattering");
     prop->untie("/rendering/scene/overcast");
-
-    prop->untie("/sim/time/sun-angle-rad");
     prop->untie("/rendering/scene/ambient/red");
     prop->untie("/rendering/scene/ambient/green");
     prop->untie("/rendering/scene/ambient/blue");
@@ -453,4 +452,6 @@ void FGLight::updateSunPos()
 
     // cout << "  Sky needs to rotate = " << _sun_rotation << " rads = "
     //      << _sun_rotation * SGD_RADIANS_TO_DEGREES << " degrees." << endl;
+  
+    _sunAngleRad->setDoubleValue(_sun_angle);
 }
diff --git a/src/Time/light.hxx b/src/Time/light.hxx
index 1880c3dea..a7be74786 100644
--- a/src/Time/light.hxx
+++ b/src/Time/light.hxx
@@ -112,6 +112,8 @@ private:
     // properties for chrome light; not a tie because I want to fire
     // property listeners when the values change.
     SGPropertyNode_ptr _chromeProps[4];
+  
+    SGPropertyNode_ptr _sunAngleRad;
 public:
 
     FGLight ();