view layer/PianoScale.cpp @ 1394:4a36f6130056 spectrogramparam

Various tweaks & fixes to log-scale handling in spectrum. We can't easily preserve the nice behaviour where peaks stay in place as fft size changes, without potentially losing a bit of low-frequency information

/* -*- 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 "PianoScale.h"

#include <QPainter>

#include <cmath>

#include "base/Pitch.h"

#include "LayerGeometryProvider.h"
#include "HorizontalScaleProvider.h"

#include <iostream>
using namespace std;

void
PianoScale::paintPianoVertical(LayerGeometryProvider *v,
                               QPainter &paint,
                               QRect r,
                               double minf,
                               double maxf)
{
    int x0 = r.x(), y0 = r.y(), x1 = r.x() + r.width(), y1 = r.y() + r.height();

    paint.drawLine(x0, y0, x0, y1);

    int py = y1, ppy = y1;
    paint.setBrush(paint.pen().color());

    for (int i = 0; i < 128; ++i) {

        double f = Pitch::getFrequencyForPitch(i);
        int y = int(lrint(v->getYForFrequency(f, minf, maxf, true)));

        if (y < y0 - 2) break;
        if (y > y1 + 2) {
            continue;
        }
        
        int n = (i % 12);
        
        if (n == 1) {
            // C# -- fill the C from here
            QColor col = Qt::gray;
            if (i == 61) { // filling middle C
                col = Qt::blue;
                col = col.light(150);
            }
            if (ppy - y > 2) {
                paint.fillRect(x0 + 1,
                               y,
                               x1 - x0,
                               (py + ppy) / 2 - y,
                               col);
            }
        }
        
        if (n == 1 || n == 3 || n == 6 || n == 8 || n == 10) {
            // black notes
            paint.drawLine(x0 + 1, y, x1, y);
            int rh = ((py - y) / 4) * 2;
            if (rh < 2) rh = 2;
            paint.drawRect(x0 + 1, y - (py-y)/4, (x1 - x0) / 2, rh);
        } else if (n == 0 || n == 5) {
            // C, F
            if (py < y1) {
                paint.drawLine(x0 + 1, (y + py) / 2, x1, (y + py) / 2);
            }
        }
        
        ppy = py;
        py = y;
    }
}

void
PianoScale::paintPianoHorizontal(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);

    int px = x0, ppx = x0;
    paint.setBrush(paint.pen().color());

    for (int i = 0; i < 128; ++i) {

        double f = Pitch::getFrequencyForPitch(i);
        int x = int(lrint(p->getXForFrequency(v, f)));

        if (i == 0) {
            px = ppx = x;
        }
        if (i == 1) {
            ppx = px - (x - px);
        }
        
        if (x < x0) {
            ppx = px;
            px = x;
            continue;
        }
        
        if (x > x1) {
            break;
        }

        int n = (i % 12);

        if (n == 1) {
            // C# -- fill the C from here
            QColor col = Qt::gray;
            if (i == 61) { // filling middle C
                col = Qt::blue;
                col = col.light(150);
            }
            if (x - ppx > 2) {
                paint.fillRect((px + ppx) / 2 + 1,
                               y0 + 1,
                               x - (px + ppx) / 2 - 1,
                               y1 - y0,
                               col);
            }
        }

        if (n == 1 || n == 3 || n == 6 || n == 8 || n == 10) {
            // black notes
            paint.drawLine(x, y0, x, y1);
            int rw = int(lrint(double(x - px) / 4) * 2);
            if (rw < 2) rw = 2;
            paint.drawRect(x - rw/2, (y0 + y1) / 2, rw, (y1 - y0) / 2);
        } else if (n == 0 || n == 5) {
            // C, F
            if (px < x1) {
                paint.drawLine((x + px) / 2, y0, (x + px) / 2, y1);
            }
        }
        
        ppx = px;
        px = x;
    }
}