From 8c445dac6778aa2fcfc42736a563e8de101bd817 Mon Sep 17 00:00:00 2001
From: Justin Clark-Casey (justincc)
Date: Fri, 6 Jan 2012 21:12:22 +0000
Subject: Add script instruction count back to llRot2Euler.  Other minor
 formatting/doc changes.

---
 .../Shared/Api/Implementation/LSL_Api.cs           | 14 +++++++--
 .../ScriptEngine/Shared/Tests/LSL_ApiTest.cs       | 34 +++++++++++++---------
 2 files changed, 32 insertions(+), 16 deletions(-)

(limited to 'OpenSim/Region')

diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index d6316b2..a35e75f 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -468,10 +468,19 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
         //Now we start getting into quaternions which means sin/cos, matrices and vectors. ckrinke
 
-        // Using algorithm based off http://www.euclideanspace.com/maths/geometry/rotations/conversions/quaternionToEuler/quat_2_euler_paper_ver2-1.pdf
-        // to avoid issues with singularity and rounding with Y rotation of +/- PI/2
+        /// <summary>
+        /// Convert an LSL rotation to a Euler vector.
+        /// </summary>
+        /// <remarks>
+        /// Using algorithm based off http://www.euclideanspace.com/maths/geometry/rotations/conversions/quaternionToEuler/quat_2_euler_paper_ver2-1.pdf
+        /// to avoid issues with singularity and rounding with Y rotation of +/- PI/2
+        /// </remarks>
+        /// <param name="r"></param>
+        /// <returns></returns>
         public LSL_Vector llRot2Euler(LSL_Rotation r)
         {
+            m_host.AddScriptLPS(1);
+
             LSL_Vector v = new LSL_Vector(0.0, 0.0, 1.0) * r;   // Z axis unit vector unaffected by Z rotation component of r.
             double m = LSL_Vector.Mag(v);                       // Just in case v isn't normalized, need magnitude for Asin() operation later.
             if (m == 0.0) return new LSL_Vector();
@@ -482,6 +491,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             // Rotate X axis unit vector by r and unwind the X and Y rotations leaving only the Z rotation
             v = new LSL_Vector(1.0, 0.0, 0.0) * ((r * new LSL_Rotation(Math.Sin(-x / 2.0), 0.0, 0.0, Math.Cos(-x / 2.0))) * new LSL_Rotation(0.0, Math.Sin(-y / 2.0), 0.0, Math.Cos(-y / 2.0)));
             double z = Math.Atan2(v.y, v.x);
+
             return new LSL_Vector(x, y, z);
         }
 
diff --git a/OpenSim/Region/ScriptEngine/Shared/Tests/LSL_ApiTest.cs b/OpenSim/Region/ScriptEngine/Shared/Tests/LSL_ApiTest.cs
index 7594691..99c1cf4 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Tests/LSL_ApiTest.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Tests/LSL_ApiTest.cs
@@ -201,20 +201,26 @@ namespace OpenSim.Region.ScriptEngine.Shared.Tests
             CheckllRot2Euler(new LSL_Types.Quaternion(-0.092302, -0.701059, -0.092302, -0.701059));
         }
 
-        // Testing Rot2Euler this way instead of comparing against expected angles because
-        // 1. There are several ways to get to the original Quaternion. For example a rotation
-        //    of PI and -PI will give the same result. But PI and -PI aren't equal.
-        // 2. This method checks to see if the calculated angles from a quaternion can be used
-        //    to create a new quaternion to produce the same rotation.
-        // However, can't compare the newly calculated quaternion against the original because
-        // once again, there are multiple quaternions that give the same result. For instance
-        //  <X, Y, Z, S> == <-X, -Y, -Z, -S>.  Additionally, the magnitude of S can be changed
-        // and will still result in the same rotation if the values for X, Y, Z are also changed
-        // to compensate.
-        // However, if two quaternions represent the same rotation, then multiplying the first
-        // quaternion by the conjugate of the second, will give a third quaternion representing
-        // a zero rotation. This can be tested for by looking at the X, Y, Z values which should
-        // be zero.
+        /// <summary>
+        /// Check an llRot2Euler conversion.
+        /// </summary>
+        /// <remarks>
+        /// Testing Rot2Euler this way instead of comparing against expected angles because
+        /// 1. There are several ways to get to the original Quaternion. For example a rotation
+        ///    of PI and -PI will give the same result. But PI and -PI aren't equal.
+        /// 2. This method checks to see if the calculated angles from a quaternion can be used
+        ///    to create a new quaternion to produce the same rotation.
+        /// However, can't compare the newly calculated quaternion against the original because
+        /// once again, there are multiple quaternions that give the same result. For instance
+        ///  <X, Y, Z, S> == <-X, -Y, -Z, -S>.  Additionally, the magnitude of S can be changed
+        /// and will still result in the same rotation if the values for X, Y, Z are also changed
+        /// to compensate.
+        /// However, if two quaternions represent the same rotation, then multiplying the first
+        /// quaternion by the conjugate of the second, will give a third quaternion representing
+        /// a zero rotation. This can be tested for by looking at the X, Y, Z values which should
+        /// be zero.
+        /// </remarks>
+        /// <param name="rot"></param>
         private void CheckllRot2Euler(LSL_Types.Quaternion rot)
         {
             // Call LSL function to convert quaternion rotaion to euler radians.
-- 
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