Add tutorial step7 - interpolation

tutorials/Makefile.am

@@ -11,6 +11,7 @@ bin_PROGRAMS += \
 	tutorials/general/t8_step5_element_data \
 	tutorials/general/t8_step5_element_data_c_interface \
 	tutorials/general/t8_step6_stencil \
+	tutorials/general/t8_step7_interpolation \
 	tutorials/general/t8_tutorial_search \
 	tutorials/features/t8_features_curved_meshes
 
@@ -43,6 +44,10 @@ tutorials_general_t8_step6_stencil_SOURCES = \
 	tutorials/general/t8_step3_adapt_forest.cxx \
 	tutorials/general/t8_step6_stencil.cxx \
 	tutorials/general/t8_step6_main.cxx
+tutorials_general_t8_step7_interpolation_SOURCES = \
+	tutorials/general/t8_step3_adapt_forest.cxx \
+	tutorials/general/t8_step7_interpolation.cxx \
+	tutorials/general/t8_step7_main.cxx
 tutorials_general_t8_tutorial_search_SOURCES = \
 	tutorials/general/t8_tutorial_search.cxx \
 	tutorials/general/t8_step3_adapt_forest.cxx
@@ -53,4 +58,5 @@ libt8_installed_headers += \
         tutorials/general/t8_step3.h \
         tutorials/general/t8_step4.h \
         tutorials/general/t8_step5.h \
-        tutorials/general/t8_step6.h
+        tutorials/general/t8_step6.h \
+        tutorials/general/t8_step7.h

tutorials/general/t8_step7.h

@@ -0,0 +1,49 @@
+/*
+  This file is part of t8code.
+  t8code is a C library to manage a collection (a forest) of multiple
+  connected adaptive space-trees of general element classes in parallel.
+
+  Copyright (C) 2015 the developers
+
+  t8code is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  t8code is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with t8code; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+*/
+
+/** file t8_step7.h
+ */
+
+#ifndef T8_STEP7_H
+#define T8_STEP7_H
+
+#include <t8.h>
+
+T8_EXTERN_C_BEGIN ();
+
+/* This is our own defined data that we will pass on to the
+ * adaptation callback. */
+struct t8_step7_adapt_data
+{
+  double              midpoint[3];      /* The midpoint of our sphere. */
+  double              refine_if_inside_radius;  /* if an element's center is smaller than this value, we refine the element. */
+  double              coarsen_if_outside_radius;        /* if an element's center is larger this value, we coarsen its family. */
+  double              *element_data;
+};
+
+/** This is the main program of this example.
+ */
+int                 t8_step7_main (int argc, char **argv);
+
+T8_EXTERN_C_END ();
+
+#endif /* !T8_STEP7_H */