annotate layer/LinearNumericalScale.cpp @ 1259:4d7e566092a7 scale-ticks

Rework log scale calculation, update to changed interface

/* -*- 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 "LayerGeometryProvider.h"

#include "base/ScaleTickIntervals.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;

    auto ticks = ScaleTickIntervals::linear({ minf, maxf, n });

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

    int prevy = -1;
                
    for (int i = 0; i < int(ticks.size()); ++i) {

	int y, ty;
        bool drawText = true;

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

        double val = ticks[i].value;
        QString label = QString::fromStdString(ticks[i].label);
        
	y = layer->getYForValue(v, val);

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

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

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

        prevy = y;
    }
}