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diff --git a/src/vec_grid.h b/src/vec_grid.h
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+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (C) 2021 Jan Sebastian Götte <kicad@jaseg.de>
+ * Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef VEC_GRID_H
+#define VEC_GRID_H
+
+#include <array>
+#include <vector>
+#include <functional>
+
+namespace vectorizer {
+
+typedef std::array<double, 2> d2p;
+
+enum grid_type {
+    POISSON_DISC,
+    HEXGRID,
+    SQUAREGRID
+};
+
+typedef std::function<std::vector<d2p> *(double, double, double)> sampling_fun;
+
+sampling_fun get_sampler(enum grid_type type);
+
+std::vector<d2p> *sample_poisson_disc(double w, double h, double center_distance);
+std::vector<d2p> *sample_hexgrid(double w, double h, double center_distance);
+std::vector<d2p> *sample_squaregrid(double w, double h, double center_distance);
+
+} /* namespace vectorizer */
+
+#endif /* VEC_GRID_H */