Chris@696: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@696: 
Chris@696: /*
Chris@696:     Sonic Visualiser
Chris@696:     An audio file viewer and annotation editor.
Chris@696:     Centre for Digital Music, Queen Mary, University of London.
Chris@696:     This file copyright 2006-2013 Chris Cannam and QMUL.
Chris@696:     
Chris@696:     This program is free software; you can redistribute it and/or
Chris@696:     modify it under the terms of the GNU General Public License as
Chris@696:     published by the Free Software Foundation; either version 2 of the
Chris@696:     License, or (at your option) any later version.  See the file
Chris@696:     COPYING included with this distribution for more information.
Chris@696: */
Chris@696: 
Chris@696: #include "LogNumericalScale.h"
Chris@696: #include "VerticalScaleLayer.h"
Chris@696: 
Chris@696: #include "base/LogRange.h"
Chris@696: 
Chris@696: #include <QPainter>
Chris@696: 
Chris@696: #include <cmath>
Chris@696: 
Chris@1077: #include "LayerGeometryProvider.h"
Chris@696: 
Chris@1260: #include "base/ScaleTickIntervals.h"
Chris@696: 
Chris@696: int
Chris@918: LogNumericalScale::getWidth(LayerGeometryProvider *,
Chris@1266:                             QPainter &paint)
Chris@696: {
Chris@699:     return paint.fontMetrics().width("-000.00") + 10;
Chris@696: }
Chris@696: 
Chris@696: void
Chris@918: LogNumericalScale::paintVertical(LayerGeometryProvider *v,
Chris@1266:                                  const VerticalScaleLayer *layer,
Chris@1266:                                  QPainter &paint,
Chris@1266:                                  int x0,
Chris@1266:                                  double minlog,
Chris@1266:                                  double maxlog)
Chris@696: {
Chris@1260:     int n = 10;
Chris@1260:     auto ticks = ScaleTickIntervals::logarithmicAlready({ minlog, maxlog, n });
Chris@1260:     n = int(ticks.size());
Chris@1260: 
Chris@696:     int w = getWidth(v, paint) + x0;
Chris@696: 
Chris@696:     int prevy = -1;
Chris@696:                 
Chris@696:     for (int i = 0; i < n; ++i) {
Chris@696: 
Chris@1266:         int y, ty;
Chris@696:         bool drawText = true;
Chris@696: 
Chris@1266:         if (i == n-1 &&
Chris@1266:             v->getPaintHeight() < paint.fontMetrics().height() * (n*2)) {
Chris@1266:             if (layer->getScaleUnits() != "") drawText = false;
Chris@1266:         }
Chris@696: 
Chris@1260:         double val = ticks[i].value;
Chris@1260:         QString label = QString::fromStdString(ticks[i].label);
Chris@696: 
Chris@1266:         y = layer->getYForValue(v, val);
Chris@696: 
Chris@1266:         ty = y - paint.fontMetrics().height() + paint.fontMetrics().ascent() + 2;
Chris@1266:         
Chris@1266:         if (prevy >= 0 && (prevy - y) < paint.fontMetrics().height()) {
Chris@1266:             continue;
Chris@696:         }
Chris@696: 
Chris@1266:         paint.drawLine(w - 5, y, w, y);
Chris@696: 
Chris@696:         if (drawText) {
Chris@1266:             paint.drawText(w - paint.fontMetrics().width(label) - 6,
Chris@1266:                            ty, label);
Chris@696:         }
Chris@696: 
Chris@696:         prevy = y;
Chris@696:     }
Chris@696: }