shape_line_chain ans shape_poly_det: add Rotate() geometric transform, useful for DRAWSEGMENT transforms

common/geometry/shape_line_chain.cpp

@@ -35,6 +35,17 @@ bool SHAPE_LINE_CHAIN::Collide( const VECTOR2I& aP, int aClearance ) const
 }
 
 
+void SHAPE_LINE_CHAIN::Rotate( double aAngle, const VECTOR2I& aCenter )
+{
+    for( std::vector<VECTOR2I>::iterator i = m_points.begin(); i != m_points.end(); ++i )
+    {
+        (*i) -= aCenter;
+        (*i) = (*i).Rotate( aAngle );
+        (*i) += aCenter;
+    }
+}
+
+
 bool SHAPE_LINE_CHAIN::Collide( const SEG& aSeg, int aClearance ) const
 {
     BOX2I box_a( aSeg.A, aSeg.B - aSeg.A );

common/geometry/shape_poly_set.cpp

@@ -1536,6 +1536,18 @@ void SHAPE_POLY_SET::Move( const VECTOR2I& aVector )
 }
 
 
+void SHAPE_POLY_SET::Rotate( double aAngle, const VECTOR2I& aCenter )
+{
+    for( POLYGON& poly : m_polys )
+    {
+        for( SHAPE_LINE_CHAIN& path : poly )
+        {
+            path.Rotate( aAngle, aCenter );
+        }
+    }
+}
+
+
 int SHAPE_POLY_SET::TotalVertices() const
 {
     int c = 0;

include/geometry/shape_line_chain.h

@@ -595,6 +595,14 @@ public:
             (*i) += aVector;
     }
 
+    /**
+     * Function Rotate
+     * rotates all vertices by a given angle
+     * @param aCenter is the rotation center
+     * @param aAngle rotation angle in radians
+     */
+    void Rotate( double aAngle, const VECTOR2I& aCenter );
+
     bool IsSolid() const override
     {
         return false;

include/geometry/shape_poly_set.h

@@ -864,6 +864,14 @@ class SHAPE_POLY_SET : public SHAPE
         /// @copydoc SHAPE::Move()
         void Move( const VECTOR2I& aVector ) override;
 
+        /**
+         * Function Rotate
+         * rotates all vertices by a given angle
+         * @param aCenter is the rotation center
+         * @param aAngle rotation angle in radians
+         */
+        void Rotate( double aAngle, const VECTOR2I& aCenter );
+
         /// @copydoc SHAPE::IsSolid()
         bool IsSolid() const override
         {