annotate layer/LogColourScale.cpp @ 1127:9fb8dfd7ce4c spectrogram-minor-refactor

Fix threshold in spectrogram -- it wasn't working in the last release.
There is a new protocol for this. Formerly the threshold parameter had a
range from -50dB to 0 with the default at -50, and -50 treated internally
as "no threshold". However, there was a hardcoded, hidden internal threshold
for spectrogram colour mapping at -80dB with anything below this being rounded
to zero. Now the threshold parameter has range -81 to -1 with the default
at -80, -81 is treated internally as "no threshold", and there is no hidden
internal threshold. So the default behaviour is the same as before, an
effective -80dB threshold, but it is now possible to change this in both
directions. Sessions reloaded from prior versions may look slightly different
because, if the session says there should be no threshold, there will now
actually be no threshold instead of having the hidden internal one.

Still need to do something in the UI to make it apparent that the -81dB
setting removes the threshold entirely. This is at least no worse than the
previous, also obscured, magic -50dB setting.

/* -*- 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 "LayerGeometryProvider.h"

int
LogColourScale::getWidth(LayerGeometryProvider *,
			    QPainter &paint)
{
    return paint.fontMetrics().width("-000.00") + 15;
}

void
LogColourScale::paintVertical(LayerGeometryProvider *v,
			      const ColourScaleLayer *layer,
			      QPainter &paint,
			      int /* x0 */,
			      double minlog,
			      double maxlog)
{
    int h = v->getPaintHeight();

    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;
    }
}