SVN commit 1224498 by khudyakov:

Add function to convert from sherical coordinates to
cartesian.

Function itself isn't used anywhere yet but this pattern
appears in lot of places in the code.

CCMAIL: kstars-devel@kde.org

 M  +12 -0     ksutils.h  


--- trunk/KDE/kdeedu/kstars/kstars/ksutils.h #1224497:1224498
@@ -30,6 +30,7 @@
 #include <Eigen/Core>
 USING_PART_OF_NAMESPACE_EIGEN
 #include <QPointF>
+#include "dms.h"
 
 class QFile;
 class QString;
@@ -73,6 +74,17 @@
         return x - delta*floor( (x-min)/delta );
     }
 
+    /** Convert from spherical to cartesian coordiate system.
+     *  Resulting vector have unit length
+     */
+    inline Vector3d fromSperical(dms longitude, dms latitude) {
+        double sinL, sinB;
+        double cosL, cosB;
+        longitude.SinCos( sinL, cosL );
+        latitude.SinCos(  sinB, cosB );
+        return Vector3d(cosB*cosL, cosB*sinL, sinB);
+    }
+
     /** Convert a vector to a point */
     inline QPointF vecToPoint(const Vector2f& vec) {
         return QPointF( vec[0], vec[1] );