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+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ * positionfilter.cc
+ *
+ * Sat 13 Feb 2021 12:46:41 CET
+ * Copyright 2019 André Nusser
+ * andre.nusser@googlemail.com
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DrumGizmo 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#include "positionfilter.h"
+
+#include "random.h"
+#include "settings.h"
+
+PositionFilter::PositionFilter(Settings& settings, Random& random)
+ : settings(settings), random(random)
+{
+}
+
+bool PositionFilter::filter(event_t& event, size_t pos)
+{
+ if (settings.enable_velocity_modifier.load())
+ {
+ float mean = event.position;
+ float stddev = settings.position_stddev.load();
+ // the 30.0f were determined empirically
+ event.position = random.normalDistribution(mean, stddev / 30.0f); // FIXME: right magic value?
+ }
+
+ return true;
+}