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@696: #include "view/View.h"
Chris@696: 
Chris@696: //#define DEBUG_TIME_VALUE_LAYER 1
Chris@696: 
Chris@696: int
Chris@696: LogNumericalScale::getWidth(View *,
Chris@696: 			    QPainter &paint)
Chris@696: {
Chris@699:     return paint.fontMetrics().width("-000.00") + 10;
Chris@696: }
Chris@696: 
Chris@696: void
Chris@696: LogNumericalScale::paintVertical(View *v,
Chris@696: 				 const VerticalScaleLayer *layer,
Chris@696: 				 QPainter &paint,
Chris@696: 				 int x0,
Chris@696: 				 float minlog,
Chris@696: 				 float maxlog)
Chris@696: {
Chris@696:     int w = getWidth(v, paint) + x0;
Chris@696: 
Chris@696:     int n = 10;
Chris@696: 
Chris@696:     float val = minlog;
Chris@696:     float inc = (maxlog - val) / n; // even increments of log scale
Chris@696: 
Chris@696:     // smallest increment as displayed
Chris@696:     float minDispInc = LogRange::unmap(minlog + inc) - LogRange::unmap(minlog);
Chris@696: 
Chris@696: #ifdef DEBUG_TIME_VALUE_LAYER
Chris@696:     cerr << "min = " << minlog << ", max = " << maxlog << ", inc = " << inc << ", minDispInc = " << minDispInc << endl;
Chris@696: #endif
Chris@696: 
Chris@864:     const int buflen = 40;
Chris@864:     char buffer[buflen];
Chris@696: 
Chris@696:     float round = 1.f;
Chris@696:     int dp = 0;
Chris@696: 
Chris@696:     if (minDispInc > 0) {
Chris@696:         int prec = trunc(log10f(minDispInc));
Chris@696:         if (prec < 0) dp = -prec;
Chris@696:         round = powf(10.f, prec);
Chris@704:         if (dp > 4) dp = 4;
Chris@696: #ifdef DEBUG_TIME_VALUE_LAYER
Chris@696:         cerr << "round = " << round << ", prec = " << prec << ", dp = " << dp << endl;
Chris@696: #endif
Chris@696:     }
Chris@696: 
Chris@696:     int prevy = -1;
Chris@696:                 
Chris@696:     for (int i = 0; i < n; ++i) {
Chris@696: 
Chris@696: 	int y, ty;
Chris@696:         bool drawText = true;
Chris@696: 
Chris@696: 	if (i == n-1 &&
Chris@696: 	    v->height() < paint.fontMetrics().height() * (n*2)) {
Chris@696: 	    if (layer->getScaleUnits() != "") drawText = false;
Chris@696: 	}
Chris@696: 
Chris@696:         float dispval = LogRange::unmap(val);
Chris@696: 	dispval = floor(dispval / round) * round;
Chris@696: 
Chris@696: #ifdef DEBUG_TIME_VALUE_LAYER
Chris@696: 	cerr << "val = " << val << ", dispval = " << dispval << endl;
Chris@696: #endif
Chris@696: 
Chris@696: 	y = layer->getYForValue(v, dispval);
Chris@696: 
Chris@696: 	ty = y - paint.fontMetrics().height() + paint.fontMetrics().ascent() + 2;
Chris@696: 	
Chris@696: 	if (prevy >= 0 && (prevy - y) < paint.fontMetrics().height()) {
Chris@696: 	    val += inc;
Chris@696: 	    continue;
Chris@696:         }
Chris@696: 
Chris@704: 	int digits = trunc(log10f(dispval));
Chris@696: 	int sf = dp + (digits > 0 ? digits : 0);
Chris@696: 	if (sf < 4) sf = 4;
Chris@704: #ifdef DEBUG_TIME_VALUE_LAYER
Chris@704:         cerr << "sf = " << sf << endl;
Chris@704: #endif
Chris@864: 	snprintf(buffer, buflen, "%.*g", sf, dispval);
Chris@696: 
Chris@696: 	QString label = QString(buffer);
Chris@696: 
Chris@696: 	paint.drawLine(w - 5, y, w, y);
Chris@696: 
Chris@696:         if (drawText) {
Chris@696: 	    paint.drawText(w - paint.fontMetrics().width(label) - 6,
Chris@696: 			   ty, label);
Chris@696:         }
Chris@696: 
Chris@696:         prevy = y;
Chris@696: 	val += inc;
Chris@696:     }
Chris@696: }