view layer/LogNumericalScale.cpp @ 1277:82258db96244 horizontal-scale

Draw some ticks

/* -*- 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 "LogNumericalScale.h"
#include "VerticalScaleLayer.h"
#include "HorizontalScaleProvider.h"
#include "LayerGeometryProvider.h"

#include "base/LogRange.h"
#include "base/ScaleTickIntervals.h"

#include <QPainter>

#include <cmath>

int
LogNumericalScale::getWidth(LayerGeometryProvider *,
                                QPainter &paint,
                                bool horizontal)
{
    if (horizontal) {
        return paint.fontMetrics().height() + 10;
    } else {
        return paint.fontMetrics().width("-000.00") + 10;
    }
}

void
LogNumericalScale::paintVertical(LayerGeometryProvider *v,
                                 const VerticalScaleLayer *layer,
                                 QPainter &paint,
                                 int x0,
                                 double minlog,
                                 double maxlog)
{
    int n = 10;
    auto ticks = ScaleTickIntervals::logarithmicAlready({ minlog, maxlog, n });
    n = int(ticks.size());

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

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

void
LogNumericalScale::paintHorizontal(LayerGeometryProvider *v,
                                   const HorizontalScaleProvider *p,
                                   QPainter &paint,
                                   QRect r)
{
    int x0 = r.x(), y0 = r.y(), x1 = r.x() + r.width(), y1 = r.y() + r.height();

    paint.drawLine(x0, y0, x1, y0);

    double f0 = p->getFrequencyForX(v, x0 ? x0 : 1);
    double f1 = p->getFrequencyForX(v, x1);

    cerr << "f0 = " << f0 << " at x " << (x0 ? x0 : 1) << endl;
    cerr << "f1 = " << f1 << " at x " << x1 << endl;
    
    int n = 10;
    auto ticks = ScaleTickIntervals::logarithmic({ f0, f1, n });
    n = int(ticks.size());

    int marginx = -1;

    for (int i = 0; i < n; ++i) {
        
        double val = ticks[i].value;
        QString label = QString::fromStdString(ticks[i].label);
        int tw = paint.fontMetrics().width(label);
        
        cerr << "i = " << i << ", value = " << val << ", tw = " << tw << endl;

        int x = int(round(p->getXForFrequency(v, val)));

        cerr << "x = " << x << endl;

        if (x < marginx) continue;
        
        //!!! todo: pixel scaling (here & elsewhere in these classes)
        
        paint.drawLine(x, y0, x, y1);

        paint.drawText(x + 5, y0 + paint.fontMetrics().ascent() + 5, label);

        marginx = x + tw + 10;
    }
}