Chris@1650: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@1650: 
Chris@1650: /*
Chris@1650:     Sonic Visualiser
Chris@1650:     An audio file viewer and annotation editor.
Chris@1650:     Centre for Digital Music, Queen Mary, University of London.
Chris@1650:     
Chris@1650:     This program is free software; you can redistribute it and/or
Chris@1650:     modify it under the terms of the GNU General Public License as
Chris@1650:     published by the Free Software Foundation; either version 2 of the
Chris@1650:     License, or (at your option) any later version.  See the file
Chris@1650:     COPYING included with this distribution for more information.
Chris@1650: */
Chris@1650: 
Chris@1650: #ifndef SV_EXTENTS_H
Chris@1650: #define SV_EXTENTS_H
Chris@1650: 
Chris@1650: #include <vector>
Chris@1650: 
Chris@1650: /**
Chris@1650:  * Maintain a min and max value, and update them when supplied a new
Chris@1650:  * data point.
Chris@1650:  */
Chris@1650: template <typename T>
Chris@1650: class Extents
Chris@1650: {
Chris@1650: public:
Chris@1650:     Extents() : m_min(T()), m_max(T()) { }
Chris@1650:     Extents(T min, T max) : m_min(min), m_max(max) { }
Chris@1650:     
Chris@1650:     bool operator==(const Extents &r) {
Chris@1650:         return r.m_min == m_min && r.m_max == m_max;
Chris@1650:     }
Chris@1650:     bool operator!=(const Extents &r) {
Chris@1650:         return !(*this == r);
Chris@1650:     }
Chris@1650:     
Chris@1650:     bool isSet() const {
Chris@1650:         return (m_min != T() || m_max != T());
Chris@1650:     }
Chris@1650:     void set(T min, T max) {
Chris@1650:         m_min = min;
Chris@1650:         m_max = max;
Chris@1650:         if (m_max < m_min) m_max = m_min;
Chris@1650:     }
Chris@1650:     void reset() {
Chris@1650:         m_min = T();
Chris@1650:         m_max = T();
Chris@1650:     }
Chris@1650: 
Chris@1650:     bool sample(T f) {
Chris@1650:         bool changed = false;
Chris@1650:         if (isSet()) {
Chris@1650:             if (f < m_min) { m_min = f; changed = true; }
Chris@1650:             if (f > m_max) { m_max = f; changed = true; }
Chris@1650:         } else {
Chris@1650:             m_max = m_min = f;
Chris@1650:             changed = true;
Chris@1650:         }
Chris@1650:         return changed;
Chris@1650:     }
Chris@1650:     bool sample(const std::vector<T> &ff) {
Chris@1650:         bool changed = false;
Chris@1650:         for (auto f: ff) {
Chris@1650:             if (sample(f)) {
Chris@1650:                 changed = true;
Chris@1650:             }
Chris@1650:         }
Chris@1650:         return changed;
Chris@1650:     }
Chris@1650:     bool sample(const Extents &r) {
Chris@1650:         bool changed = false;
Chris@1650:         if (isSet()) {
Chris@1650:             if (r.m_min < m_min) { m_min = r.m_min; changed = true; }
Chris@1650:             if (r.m_max > m_max) { m_max = r.m_max; changed = true; }
Chris@1650:         } else {
Chris@1650:             m_min = r.m_min;
Chris@1650:             m_max = r.m_max;
Chris@1650:             changed = true;
Chris@1650:         }
Chris@1650:         return changed;
Chris@1650:     }            
Chris@1650: 
Chris@1650:     T getMin() const { return m_min; }
Chris@1650:     T getMax() const { return m_max; }
Chris@1650: 
Chris@1650: private:
Chris@1650:     T m_min;
Chris@1650:     T m_max;
Chris@1650: };
Chris@1650: 
Chris@1650: #endif