svgui  1.9
PianoScale.cpp
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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
2 
3 /*
4  Sonic Visualiser
5  An audio file viewer and annotation editor.
6  Centre for Digital Music, Queen Mary, University of London.
7  This file copyright 2006-2013 Chris Cannam and QMUL.
8 
9  This program is free software; you can redistribute it and/or
10  modify it under the terms of the GNU General Public License as
11  published by the Free Software Foundation; either version 2 of the
12  License, or (at your option) any later version. See the file
13  COPYING included with this distribution for more information.
14 */
15 
16 #include "PianoScale.h"
17 
18 #include <QPainter>
19 
20 #include <cmath>
21 
22 #include "base/Pitch.h"
23 
24 #include "view/View.h"
25 
26 void
28  QPainter &paint,
29  QRect r,
30  float minf,
31  float maxf)
32 {
33  int x0 = r.x(), y0 = r.y(), x1 = r.x() + r.width(), y1 = r.y() + r.height();
34 
35  paint.drawLine(x0, y0, x0, y1);
36 
37  int py = y1, ppy = y1;
38  paint.setBrush(paint.pen().color());
39 
40  for (int i = 0; i < 128; ++i) {
41 
42  float f = Pitch::getFrequencyForPitch(i);
43  int y = lrintf(v->getYForFrequency(f, minf, maxf, true));
44 
45  if (y < y0 - 2) break;
46  if (y > y1 + 2) {
47  continue;
48  }
49 
50  int n = (i % 12);
51 
52  if (n == 1) {
53  // C# -- fill the C from here
54  QColor col = Qt::gray;
55  if (i == 61) { // filling middle C
56  col = Qt::blue;
57  col = col.light(150);
58  }
59  if (ppy - y > 2) {
60  paint.fillRect(x0 + 1,
61  y,
62  x1 - x0,
63  (py + ppy) / 2 - y,
64  col);
65  }
66  }
67 
68  if (n == 1 || n == 3 || n == 6 || n == 8 || n == 10) {
69  // black notes
70  paint.drawLine(x0 + 1, y, x1, y);
71  int rh = ((py - y) / 4) * 2;
72  if (rh < 2) rh = 2;
73  paint.drawRect(x0 + 1, y - (py-y)/4, (x1 - x0) / 2, rh);
74  } else if (n == 0 || n == 5) {
75  // C, F
76  if (py < y1) {
77  paint.drawLine(x0 + 1, (y + py) / 2, x1, (y + py) / 2);
78  }
79  }
80 
81  ppy = py;
82  py = y;
83  }
84 }
85 
void paintPianoVertical(View *v, QPainter &paint, QRect rect, float minf, float maxf)
Definition: PianoScale.cpp:27
float getYForFrequency(float frequency, float minFreq, float maxFreq, bool logarithmic) const
Return the pixel y-coordinate corresponding to a given frequency, if the frequency range is as specif...
Definition: View.cpp:377
View is the base class of widgets that display one or more overlaid views of data against a horizonta...
Definition: View.h:50