svgui  1.9
PianoScale.cpp
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00001 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
00002 
00003 /*
00004     Sonic Visualiser
00005     An audio file viewer and annotation editor.
00006     Centre for Digital Music, Queen Mary, University of London.
00007     This file copyright 2006-2013 Chris Cannam and QMUL.
00008     
00009     This program is free software; you can redistribute it and/or
00010     modify it under the terms of the GNU General Public License as
00011     published by the Free Software Foundation; either version 2 of the
00012     License, or (at your option) any later version.  See the file
00013     COPYING included with this distribution for more information.
00014 */
00015 
00016 #include "PianoScale.h"
00017 
00018 #include <QPainter>
00019 
00020 #include <cmath>
00021 
00022 #include "base/Pitch.h"
00023 
00024 #include "view/View.h"
00025 
00026 void
00027 PianoScale::paintPianoVertical(View *v,
00028                                QPainter &paint,
00029                                QRect r,
00030                                float minf,
00031                                float maxf)
00032 {
00033     int x0 = r.x(), y0 = r.y(), x1 = r.x() + r.width(), y1 = r.y() + r.height();
00034 
00035     paint.drawLine(x0, y0, x0, y1);
00036 
00037     int py = y1, ppy = y1;
00038     paint.setBrush(paint.pen().color());
00039 
00040     for (int i = 0; i < 128; ++i) {
00041 
00042         float f = Pitch::getFrequencyForPitch(i);
00043         int y = lrintf(v->getYForFrequency(f, minf, maxf, true));
00044 
00045         if (y < y0 - 2) break;
00046         if (y > y1 + 2) {
00047             continue;
00048         }
00049         
00050         int n = (i % 12);
00051         
00052         if (n == 1) {
00053             // C# -- fill the C from here
00054             QColor col = Qt::gray;
00055             if (i == 61) { // filling middle C
00056                 col = Qt::blue;
00057                 col = col.light(150);
00058             }
00059             if (ppy - y > 2) {
00060                 paint.fillRect(x0 + 1,
00061                                y,
00062                                x1 - x0,
00063                                (py + ppy) / 2 - y,
00064                                col);
00065             }
00066         }
00067         
00068         if (n == 1 || n == 3 || n == 6 || n == 8 || n == 10) {
00069             // black notes
00070             paint.drawLine(x0 + 1, y, x1, y);
00071             int rh = ((py - y) / 4) * 2;
00072             if (rh < 2) rh = 2;
00073             paint.drawRect(x0 + 1, y - (py-y)/4, (x1 - x0) / 2, rh);
00074         } else if (n == 0 || n == 5) {
00075             // C, F
00076             if (py < y1) {
00077                 paint.drawLine(x0 + 1, (y + py) / 2, x1, (y + py) / 2);
00078             }
00079         }
00080         
00081         ppy = py;
00082         py = y;
00083     }
00084 }
00085