view layer/LogNumericalScale.cpp @ 1605:ae2d5f8ff005

When asked to render the whole view width, we need to wait for the layers to be ready before we can determine what the width is
author Chris Cannam
date Thu, 30 Apr 2020 14:47:13 +0100
parents f2525e6cbdf1
children
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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 2006-2018 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 "LayerGeometryProvider.h"

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

#include <QPainter>

#include <cmath>

int
LogNumericalScale::getWidth(LayerGeometryProvider *,
                            QPainter &paint)
{
    // Qt 5.13 deprecates QFontMetrics::width(), but its suggested
    // replacement (horizontalAdvance) was only added in Qt 5.11
    // which is too new for us
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"

    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;
    }
}