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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 "LogColourScale.h"
#include "ColourScaleLayer.h"
#include "base/LogRange.h"
#include <QPainter>
#include <cmath>
#include "view/View.h"
int
LogColourScale::getWidth(View *,
QPainter &paint)
{
return paint.fontMetrics().width("-000.00") + 15;
}
void
LogColourScale::paintVertical(View *v,
const ColourScaleLayer *layer,
QPainter &paint,
int /* x0 */,
double minlog,
double maxlog)
{
int h = v->height();
int n = 10;
double val = minlog;
double inc = (maxlog - val) / n;
const int buflen = 40;
char buffer[buflen];
int boxx = 5, boxy = 5;
if (layer->getScaleUnits() != "") {
boxy += paint.fontMetrics().height();
}
int boxw = 10, boxh = h - boxy - 5;
int tx = 5 + boxx + boxw;
paint.drawRect(boxx, boxy, boxw, boxh);
paint.save();
for (int y = 0; y < boxh; ++y) {
double val = ((boxh - y) * (maxlog - minlog)) / boxh + minlog;
paint.setPen(layer->getColourForValue(v, LogRange::unmap(val)));
paint.drawLine(boxx + 1, y + boxy + 1, boxx + boxw, y + boxy + 1);
}
paint.restore();
int dp = 0;
if (inc > 0) {
int prec = int(trunc(log10(inc)));
prec -= 1;
if (prec < 0) dp = -prec;
}
for (int i = 0; i < n; ++i) {
int y, ty;
y = boxy + int(boxh - ((val - minlog) * boxh) / (maxlog - minlog));
ty = y - paint.fontMetrics().height() +
paint.fontMetrics().ascent() + 2;
double dv = LogRange::unmap(val);
int digits = int(trunc(log10(dv)));
int sf = dp + (digits > 0 ? digits : 0);
if (sf < 2) sf = 2;
snprintf(buffer, buflen, "%.*g", sf, dv);
QString label = QString(buffer);
paint.drawLine(boxx + boxw - boxw/3, y, boxx + boxw, y);
paint.drawText(tx, ty, label);
val += inc;
}
}
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