view layer/LinearNumericalScale.cpp @ 1269:f2894944c6b8

Make the overlays at either end translucent, so they don't completely crop out any underlying text or necessary info (e.g. selection extents)
author Chris Cannam
date Thu, 19 Apr 2018 14:35:59 +0100
parents a34a2a25907c
children b4cb11ca8233
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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 "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 });
    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;
    }
}