view layer/LogColourScale.cpp @ 1204:d421df27e184 3.0-integration

Further PropertyBox layout overhaul: avoid crash (/ assertion failure) when property type changes from e.g. colour to colourmap, by replacing the existing widget within the layout rather than trying to repopulate it
author Chris Cannam
date Tue, 20 Dec 2016 10:49:24 +0000
parents 5144d7185fb5
children a34a2a25907c
line wrap: on
line source
/* -*- 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;
    }
}