Chris@1186: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@1186: 
Chris@1186: /*
Chris@1186:     Sonic Visualiser
Chris@1186:     An audio file viewer and annotation editor.
Chris@1186:     Centre for Digital Music, Queen Mary, University of London.
Chris@1186:     This file copyright 2006 Chris Cannam and QMUL.
Chris@1186:     
Chris@1186:     This program is free software; you can redistribute it and/or
Chris@1186:     modify it under the terms of the GNU General Public License as
Chris@1186:     published by the Free Software Foundation; either version 2 of the
Chris@1186:     License, or (at your option) any later version.  See the file
Chris@1186:     COPYING included with this distribution for more information.
Chris@1186: */
Chris@1186: 
Chris@1186: #ifndef MAGNITUDE_RANGE_H
Chris@1186: #define MAGNITUDE_RANGE_H
Chris@1186: 
Chris@1194: #include <vector>
Chris@1194: 
Chris@1186: /**
Chris@1186:  * Maintain a min and max value, and update them when supplied a new
Chris@1186:  * data point.
Chris@1186:  */
Chris@1186: class MagnitudeRange
Chris@1186: {
Chris@1186: public:
Chris@1186:     MagnitudeRange() : m_min(0), m_max(0) { }
Chris@1186:     bool operator==(const MagnitudeRange &r) {
Chris@1186: 	return r.m_min == m_min && r.m_max == m_max;
Chris@1186:     }
Chris@1186:     bool isSet() const { return (m_min != 0.f || m_max != 0.f); }
Chris@1186:     void set(float min, float max) {
Chris@1186: 	m_min = min;
Chris@1186: 	m_max = max;
Chris@1186: 	if (m_max < m_min) m_max = m_min;
Chris@1186:     }
Chris@1186:     bool sample(float f) {
Chris@1186: 	bool changed = false;
Chris@1186: 	if (isSet()) {
Chris@1186: 	    if (f < m_min) { m_min = f; changed = true; }
Chris@1186: 	    if (f > m_max) { m_max = f; changed = true; }
Chris@1186: 	} else {
Chris@1186: 	    m_max = m_min = f;
Chris@1186: 	    changed = true;
Chris@1186: 	}
Chris@1186: 	return changed;
Chris@1194:     }
Chris@1194:     bool sample(const std::vector<float> &ff) {
Chris@1194:         bool changed = false;
Chris@1194:         for (auto f: ff) {
Chris@1194:             if (sample(f)) {
Chris@1194:                 changed = true;
Chris@1194:             }
Chris@1194:         }
Chris@1194:         return changed;
Chris@1194:     }
Chris@1186:     bool sample(const MagnitudeRange &r) {
Chris@1186: 	bool changed = false;
Chris@1186: 	if (isSet()) {
Chris@1186: 	    if (r.m_min < m_min) { m_min = r.m_min; changed = true; }
Chris@1186: 	    if (r.m_max > m_max) { m_max = r.m_max; changed = true; }
Chris@1186: 	} else {
Chris@1186: 	    m_min = r.m_min;
Chris@1186: 	    m_max = r.m_max;
Chris@1186: 	    changed = true;
Chris@1186: 	}
Chris@1186: 	return changed;
Chris@1186:     }            
Chris@1186:     float getMin() const { return m_min; }
Chris@1186:     float getMax() const { return m_max; }
Chris@1186: private:
Chris@1186:     float m_min;
Chris@1186:     float m_max;
Chris@1186: };
Chris@1186: 
Chris@1186: #endif