view layer/LinearNumericalScale.cpp @ 855:57efeb75880d

Simplify some logic where loop was used with an unconditional "break" that meant it could only happen once (from coverity scan)
author Chris Cannam
date Wed, 03 Sep 2014 12:05:45 +0100
parents 1d526ba11a24
children 3ca3b8fbbcee
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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(View *,
			       QPainter &paint)
{
    return paint.fontMetrics().width("-000.00") + 10;
}

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

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

    char buffer[40];

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

    float round = 1.f;
    int dp = 0;
    if (inc > 0) {
        int prec = trunc(log10f(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
    }

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

	int y, ty;
        bool drawText = true;

        float dispval = val;

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

	sprintf(buffer, "%.*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;
    }
}