annotate layer/LinearColourScale.cpp @ 959:2633a1d73e39

Address #1214, layer import produces wrong layer type. We needed a more principled approach to making sure the format gets updated properly and the dialog elements are consistent (basically separating making the dialog elements consistent from subsequently updating the format). This change should provide that, though there may be gotchas still.

/* -*- 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 "LinearColourScale.h"
#include "ColourScaleLayer.h"

#include <QPainter>

#include <cmath>

#include "view/View.h"

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

void
LinearColourScale::paintVertical(View *v,
				 const ColourScaleLayer *layer,
				 QPainter &paint,
				 int /* x0 */,
				 double min,
				 double max)
{
    int h = v->height();

    int n = 10;

    double val = min;
    double inc = (max - 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) * (max - min)) / boxh + min;
	paint.setPen(layer->getColourForValue(v, val));
	paint.drawLine(boxx + 1, y + boxy + 1, boxx + boxw, y + boxy + 1);
    }
    paint.restore();

//    double round = 1.f;
    int dp = 0;
    if (inc > 0) {
        int prec = int(trunc(log10(inc)));
        prec -= 1;
        if (prec < 0) dp = -prec;
//        round = powf(10.f, prec);
//#ifdef DEBUG_TIME_VALUE_LAYER
//        cerr << "inc = " << inc << ", round = " << round << ", dp = " << dp << endl;
//#endif
    }

    for (int i = 0; i < n; ++i) {

	int y, ty;

	y = boxy + int(boxh - ((val - min) * boxh) / (max - min));

	ty = y - paint.fontMetrics().height() +
	    paint.fontMetrics().ascent() + 2;

	snprintf(buffer, buflen, "%.*f", dp, val);
	QString label = QString(buffer);

	paint.drawLine(boxx + boxw - boxw/3, y, boxx + boxw, y);
	paint.drawText(tx, ty, label);

	val += inc;
    }
}