Version 1.0

Added: Configuration Editor, which allows to edit configurations in a graphical user interface. Contains GUIs for most commands supported by E-APO, but as lines can also be edited directly, all commands can be used.
Added: Command "GraphicEQ", which can act as a regular, fixed-band graphic equalizer (via the GUI) but also supports variable bands so that any desired frequency response can be specified. Internally, it is implemented via convolution with a generated IR.
Added: Command "Convolution", which allows to convolve the signal with a user-provided impulse response to achieve e.g. equalization or reverberation effects.
Improved: Configurator performs checks for registry values that are needed for the operation of E-APO, which may be changed by driver installations, fixing the values if necessary.
Improved: Configurator shows which is the default device as a hint to the user.

Editor/widgets/FrequencyPlotHRuler.cpp

@@ -0,0 +1,90 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	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.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License along
+	with this program; if not, write to the Free Software Foundation, Inc.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <algorithm>
+#include <QPainter>
+
+#include "FrequencyPlotView.h"
+#include "FrequencyPlotHRuler.h"
+
+using namespace std;
+
+FrequencyPlotHRuler::FrequencyPlotHRuler(QWidget* parent) :
+	QWidget(parent)
+{
+}
+
+void FrequencyPlotHRuler::paintEvent(QPaintEvent*)
+{
+	QPainter painter(this);
+	FrequencyPlotView* view = qobject_cast<FrequencyPlotView*>(parentWidget());
+	FrequencyPlotScene* s = view->scene();
+	QFontMetrics metrics = painter.fontMetrics();
+	painter.setPen(QColor(50, 50, 50));
+
+	QPointF topLeft = view->mapToScene(0, 0);
+	QPointF bottomRight = view->mapToScene(view->viewport()->width(), view->viewport()->height());
+	double fromHz = s->xToHz(topLeft.x());
+	double toHz = s->xToHz(bottomRight.x());
+	const vector<double>& bands = s->getBands();
+	if(bands.empty())
+	{
+		double hzBase = pow(10, floor(log10(fromHz)));
+		fromHz = floor(fromHz / hzBase) * hzBase;
+		fromHz += hzBase;
+		if(round(fromHz / hzBase) >= 10)
+			hzBase *= 10;
+		for(double hz = fromHz; hz <= toHz;)
+		{
+			double x = s->hzToX(hz);
+			if(x != -1)
+			{
+				QString text;
+				if(hz < 1000)
+					text = QString("%0").arg(hz);
+				else
+					text = QString("%0k").arg(hz / 1000);
+				if(metrics.width(text) + 2 < s->hzToX(hz + hzBase) - x)
+					painter.drawText(x - topLeft.x() + height() + 1, 0, 0, height(), Qt::TextDontClip | Qt::AlignCenter, text);
+			}
+
+			hz += hzBase;
+			if(round(hz / hzBase) >= 10)
+				hzBase *= 10;
+		}
+	}
+	else
+	{
+		vector<double>::const_iterator it = lower_bound(bands.cbegin(), bands.cend(), fromHz);
+		for(; it != bands.cend() && *it < toHz; it++)
+		{
+			double hz = *it;
+			double x = s->hzToX(hz);
+			if(x != -1)
+			{
+				QString text;
+				if(hz < 1000)
+					text = QString("%0").arg(hz);
+				else
+					text = QString("%0k").arg(hz / 1000);
+				painter.drawText(x - topLeft.x() + height() + 1, 0, 0, height(), Qt::TextDontClip | Qt::AlignCenter, text);
+			}
+		}
+	}
+}