Chris@1281: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@1281: 
Chris@1281: /*
Chris@1281:     Sonic Visualiser
Chris@1281:     An audio file viewer and annotation editor.
Chris@1281:     Centre for Digital Music, Queen Mary, University of London.
Chris@1281:     This file copyright 2006-2018 Chris Cannam and QMUL.
Chris@1281:     
Chris@1281:     This program is free software; you can redistribute it and/or
Chris@1281:     modify it under the terms of the GNU General Public License as
Chris@1281:     published by the Free Software Foundation; either version 2 of the
Chris@1281:     License, or (at your option) any later version.  See the file
Chris@1281:     COPYING included with this distribution for more information.
Chris@1281: */
Chris@1281: 
Chris@1281: #include "HorizontalFrequencyScale.h"
Chris@1281: #include "HorizontalScaleProvider.h"
Chris@1281: #include "LayerGeometryProvider.h"
Chris@1281: 
Chris@1281: #include "base/ScaleTickIntervals.h"
Chris@1281: 
Chris@1281: #include <QPainter>
Chris@1281: 
Chris@1281: #include <cmath>
Chris@1281: 
Chris@1281: int
Chris@1281: HorizontalFrequencyScale::getHeight(LayerGeometryProvider *,
Chris@1281:                                     QPainter &paint)
Chris@1281: {
Chris@1281:     return paint.fontMetrics().height() + 10;
Chris@1281: }
Chris@1281: 
Chris@1281: void
Chris@1281: HorizontalFrequencyScale::paintScale(LayerGeometryProvider *v,
Chris@1281:                                      const HorizontalScaleProvider *p,
Chris@1281:                                      QPainter &paint,
Chris@1281:                                      QRect r,
Chris@1281:                                      bool logarithmic)
Chris@1281: {
Chris@1281:     int x0 = r.x(), y0 = r.y(), x1 = r.x() + r.width(), y1 = r.y() + r.height();
Chris@1281: 
Chris@1281:     paint.drawLine(x0, y0, x1, y0);
Chris@1281: 
Chris@1281:     double f0 = p->getFrequencyForX(v, x0 ? x0 : 1);
Chris@1281:     double f1 = p->getFrequencyForX(v, x1);
Chris@1281: 
Chris@1281:     int n = 20;
Chris@1281: 
Chris@1281:     auto ticks =
Chris@1281:         logarithmic ?
Chris@1281:         ScaleTickIntervals::logarithmic({ f0, f1, n }) :
Chris@1281:         ScaleTickIntervals::linear({ f0, f1, n });
Chris@1281: 
Chris@1281:     n = int(ticks.size());
Chris@1281: 
Chris@1281:     int marginx = -1;
Chris@1281: 
Chris@1281:     for (int i = 0; i < n; ++i) {
Chris@1281:         
Chris@1281:         double val = ticks[i].value;
Chris@1281:         QString label = QString::fromStdString(ticks[i].label);
Chris@1281:         int tw = paint.fontMetrics().width(label);
Chris@1281:         
Chris@1281:         int x = int(round(p->getXForFrequency(v, val)));
Chris@1281: 
Chris@1281:         if (x < marginx) continue;
Chris@1281:         
Chris@1281:         //!!! todo: pixel scaling (here & elsewhere in these classes)
Chris@1281:         
Chris@1281:         paint.drawLine(x, y0, x, y1);
Chris@1281: 
Chris@1281:         paint.drawText(x + 5, y0 + paint.fontMetrics().ascent() + 5, label);
Chris@1281: 
Chris@1281:         marginx = x + tw + 10;
Chris@1281:     }
Chris@1281: }
Chris@1281: