comparison layer/PianoScale.cpp @ 690:8072264dc61f

Pull out PianoScale into separate class

+/* -*- 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 "view/View.h"
+
+void
+PianoScale::paintPianoVertical(View *v,
+			       QPainter &paint,
+			       QRect r,
+			       float minf,
+			       float 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) {
+
+	float f = Pitch::getFrequencyForPitch(i);
+	int y = lrintf(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;
+    }
+}
+