Experimental dynamic, position based, velocity range detection.

1 files changed, 87 insertions, 0 deletions

diff --git a/src/position_power.h b/src/position_power.h
new file mode 100644
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+++ b/src/position_power.h
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+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ *            position_power.h
+ *
+ *  Wed Jul 24 15:05:26 CEST 2024
+ *  Copyright 2024 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  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.
+ */
+#pragma once
+
+#include "instrument.h"
+
+#include <vector>
+
+class Sample;
+
+//!
+//! Consider samples in the samplelist as a two dimensional "point cloud" - each
+//! also pointing to sample data (which is not used here):
+//!
+//!   (vel)
+//!    S_v
+//! max ^
+//!     |x           x
+//!     |  x      x      x
+//!     |      x      x
+//!     |   x           x
+//!     | x       x x
+//! min |________________> S_p (pos)
+//!   center            rim
+//!
+//! N: is the total number of samples
+//!
+//! S, is a specific sample
+//! S_v, is the sample's velocity
+//! S_p, is the sample's position
+//!
+//! I_v, is the input note velocity
+//! I_p, is the input note position
+//!
+//! -----
+//!
+//! Define the range R with width R_w around I_p, such that at least N/4 samples are
+//! included (note the count N/4 probably needs narrowing):
+//!
+//!   (vel)
+//!    S_v
+//! max ^
+//!     |x           x
+//!     |  x .    +.     x
+//!     |    . +   .  x
+//!     |   x.     .    x
+//!     | x  .    +.x
+//! min |____._____._____> S_p (pos)
+//!   center .  ^  .    rim
+//!          . I_p .
+//!          {  R  }
+//! x is a sample that is not included in the set, + is a sample that is.
+//!
+//! Now for the range R, find the R_max velocity and the R_min velocity.
+//! Use these as the boundaries for the velocity [0; 1] range.
+//!
+//! If no position information is available, the range will include all samples in
+//! the range, because all have the default value 0.
+//! This mimics perfectly the behaviour we have today.
+//!
+//! \param samplelist is the search space, \param position is the search origo (S_p)
+//! \returns a tuple {R_min, R_max}, which defaults to {0, 1} if the samplelist is empty
+Instrument::PowerRange positionPower(const std::vector<Sample*>& samplelist, double position);