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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2010 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __FREESTYLE_ADVANCED_PREDICATES_1D_H__
+#define __FREESTYLE_ADVANCED_PREDICATES_1D_H__
+
+/** \file blender/freestyle/intern/stroke/AdvancedPredicates1D.h
+ *  \ingroup freestyle
+ *  \brief Class gathering stroke creation algorithms
+ *  \author Stephane Grabli
+ *  \date 01/07/2003
+ */
+
+#include <string>
+
+#include "AdvancedFunctions1D.h"
+#include "Predicates1D.h"
+
+#include "../view_map/Interface1D.h"
+
+//
+// Predicates definitions
+//
+///////////////////////////////////////////////////////////
+
+namespace Predicates1D {
+
+// DensityLowerThanUP1D
+/*! Returns true if the density evaluated for the
+*  Interface1D is less than a user-defined density value.
+*/
+class DensityLowerThanUP1D : public UnaryPredicate1D
+{
+public:
+	/*! Builds the functor.
+	 *  \param threshold
+	 *    The value of the threshold density.
+	 *    Any Interface1D having a density lower than this threshold will match.
+	 *  \param sigma
+	 *    The sigma value defining the density evaluation window size used in the DensityF0D functor.
+	 */
+	DensityLowerThanUP1D(double threshold, double sigma = 2)
+	{
+		_threshold = threshold;
+		_sigma = sigma;
+	}
+
+	/*! Returns the string "DensityLowerThanUP1D" */
+	string getName() const
+	{
+		return "DensityLowerThanUP1D";
+	}
+
+	/*! The () operator. */
+	int operator()(Interface1D& inter)
+	{
+		Functions1D::DensityF1D fun(_sigma);
+		if (fun(inter) < 0)
+			return -1;
+		result = (fun.result < _threshold);
+		return 0;
+	}
+
+private:
+	double _sigma;
+	double _threshold;
+};
+
+} // end of namespace Predicates1D
+
+#endif // __FREESTYLE_ADVANCED_PREDICATES_1D_H__