From b5f155ee26df89e7447735e37d1f9c7ffd877843 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Nusser?= <anusser@mpi-inf.mpg.de>
Date: Sat, 13 Feb 2021 13:17:39 +0100
Subject: Add position filter.

---
 src/positionfilter.cc | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 src/positionfilter.cc

(limited to 'src/positionfilter.cc')

diff --git a/src/positionfilter.cc b/src/positionfilter.cc
new file mode 100644
index 0000000..8d2f987
--- /dev/null
+++ b/src/positionfilter.cc
@@ -0,0 +1,48 @@
+/* -*- 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;
+}
-- 
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