view layer/LogColourScale.cpp @ 1447:8afea53332f3 single-point

Add option to make pane sizes auto-resize-only (i.e. remove user control via a splitter); also place alignment views above panes instead of below, meaning the extra bit of space that we currently have for the pane without one at least goes to the primary pane

/* -*- 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;
    }
}