view layer/LinearNumericalScale.cpp @ 1024:3bce4c45b681 spectrogram-minor-refactor

Rearrange cache update calculations so as to use the actual painted width returned by paint functions (though they only ever return the same width as requested, at this point)
author Chris Cannam
date Mon, 25 Jan 2016 15:52:26 +0000
parents 4fe7a09be0fe
children 5144d7185fb5
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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 "LinearNumericalScale.h"
#include "VerticalScaleLayer.h"

#include <QPainter>

#include <cmath>

#include "view/View.h"

int
LinearNumericalScale::getWidth(LayerGeometryProvider *,
			       QPainter &paint)
{
    return paint.fontMetrics().width("-000.00") + 10;
}

void
LinearNumericalScale::paintVertical(LayerGeometryProvider *v,
				    const VerticalScaleLayer *layer,
				    QPainter &paint,
				    int x0,
				    double minf,
				    double maxf)
{
    int n = 10;

    double val = minf;
    double inc = (maxf - val) / n;

    const int buflen = 40;
    char buffer[buflen];

    int w = getWidth(v, paint) + x0;

    double round = 1.0;
    int dp = 0;
    if (inc > 0) {
        int prec = int(trunc(log10(inc)));
        prec -= 1;
        if (prec < 0) dp = -prec;
        round = pow(10.0, prec);
#ifdef DEBUG_TIME_VALUE_LAYER
        cerr << "inc = " << inc << ", round = " << round << ", dp = " << dp << endl;
#endif
    }

    int prevy = -1;
                
    for (int i = 0; i < n; ++i) {

	int y, ty;
        bool drawText = true;

        double dispval = val;

	if (i == n-1 &&
	    v->getPaintHeight() < paint.fontMetrics().height() * (n*2)) {
	    if (layer->getScaleUnits() != "") drawText = false;
	}
	dispval = int(rint(val / round) * round);

#ifdef DEBUG_TIME_VALUE_LAYER
	cerr << "val = " << val << ", dispval = " << dispval << endl;
#endif

	y = layer->getYForValue(v, dispval);

	ty = y - paint.fontMetrics().height() + paint.fontMetrics().ascent() + 2;
	
	if (prevy >= 0 && (prevy - y) < paint.fontMetrics().height()) {
	    val += inc;
	    continue;
        }

	snprintf(buffer, buflen, "%.*f", dp, dispval);

	QString label = QString(buffer);

	paint.drawLine(w - 5, y, w, y);

        if (drawText) {
	    paint.drawText(w - paint.fontMetrics().width(label) - 6,
			   ty, label);
        }

        prevy = y;
	val += inc;
    }
}