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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006-2013 Chris Cannam and QMUL.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#include "LogNumericalScale.h"
#include "VerticalScaleLayer.h"
#include "base/LogRange.h"
#include <QPainter>
#include <cmath>
#include "view/View.h"
//#define DEBUG_TIME_VALUE_LAYER 1
int
LogNumericalScale::getWidth(View *,
QPainter &paint)
{
return paint.fontMetrics().width("-000.00") + 10;
}
void
LogNumericalScale::paintVertical(View *v,
const VerticalScaleLayer *layer,
QPainter &paint,
int x0,
double minlog,
double maxlog)
{
int w = getWidth(v, paint) + x0;
int n = 10;
double val = minlog;
double inc = (maxlog - val) / n; // even increments of log scale
// smallest increment as displayed
double minDispInc = LogRange::unmap(minlog + inc) - LogRange::unmap(minlog);
#ifdef DEBUG_TIME_VALUE_LAYER
cerr << "min = " << minlog << ", max = " << maxlog << ", inc = " << inc << ", minDispInc = " << minDispInc << endl;
#endif
const int buflen = 40;
char buffer[buflen];
double round = 1.f;
int dp = 0;
if (minDispInc > 0) {
int prec = int(trunc(log10(minDispInc)));
if (prec < 0) dp = -prec;
round = pow(10.0, prec);
if (dp > 4) dp = 4;
#ifdef DEBUG_TIME_VALUE_LAYER
cerr << "round = " << round << ", prec = " << prec << ", dp = " << dp << endl;
#endif
}
int prevy = -1;
for (int i = 0; i < n; ++i) {
int y, ty;
bool drawText = true;
if (i == n-1 &&
v->height() < paint.fontMetrics().height() * (n*2)) {
if (layer->getScaleUnits() != "") drawText = false;
}
double dispval = LogRange::unmap(val);
dispval = floor(dispval / round) * round;
#ifdef DEBUG_TIME_VALUE_LAYER
cerr << "val = " << val << ", dispval = " << dispval << endl;
#endif
y = layer->getYForValue(v, dispval);
ty = y - paint.fontMetrics().height() + paint.fontMetrics().ascent() + 2;
if (prevy >= 0 && (prevy - y) < paint.fontMetrics().height()) {
val += inc;
continue;
}
int digits = int(trunc(log10(dispval)));
int sf = dp + (digits > 0 ? digits : 0);
if (sf < 4) sf = 4;
#ifdef DEBUG_TIME_VALUE_LAYER
cerr << "sf = " << sf << endl;
#endif
snprintf(buffer, buflen, "%.*g", sf, dispval);
QString label = QString(buffer);
paint.drawLine(w - 5, y, w, y);
if (drawText) {
paint.drawText(w - paint.fontMetrics().width(label) - 6,
ty, label);
}
prevy = y;
val += inc;
}
}
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