comparison base/RangeMapper.h @ 189:0703252c9fe8

* Add spectrum icon
* Start range mapper class for use in mapping between e.g. dial positions
  and underlying values

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006 Chris Cannam.
+    
+    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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _RANGE_MAPPER_H_
+#define _RANGE_MAPPER_H_
+
+#include <QString>
+
+
+class RangeMapper 
+{
+public:
+    virtual ~RangeMapper() { }
+    virtual int getPositionForValue(float value) const = 0;
+    virtual float getValueForPosition(int position) const = 0;
+    virtual QString getUnit() const { return ""; }
+};
+
+
+class LinearRangeMapper : public RangeMapper
+{
+public:
+    LinearRangeMapper(int minpos, int maxpos,
+                      float minval, float maxval,
+                      QString unit = "");
+    
+    virtual int getPositionForValue(float value) const;
+    virtual float getValueForPosition(int position) const;
+
+    virtual QString getUnit() const { return m_unit; }
+
+protected:
+    int m_minpos;
+    int m_maxpos;
+    float m_minval;
+    float m_maxval;
+    QString m_unit;
+};
+
+
+class LogRangeMapper : public RangeMapper
+{
+public:
+    LogRangeMapper(int minpos, int maxpos,
+                   float ratio, float minlog,
+                   QString m_unit = "");
+
+    virtual int getPositionForValue(float value) const;
+    virtual float getValueForPosition(int position) const;
+
+    virtual QString getUnit() const { return m_unit; }
+
+protected:
+    int m_minpos;
+    int m_maxpos;
+    float m_ratio;
+    float m_minlog;
+    float m_maxlog;
+    QString m_unit;
+};
+
+
+#endif