Added: Analysis panel which shows the calculated frequency response of the filters for the selected device and channel.

Improved: GUIs of GraphicEQ and Copy command can now be resized
Improved: GraphicEQ GUI can now be zoomed separately in X and Y direction using mouse wheel on rulers. Also now shows values at mouse position.
Fixed: Original APO was not released when E-APO was shutting down, leading to a memory leak.

Editor/AnalysisPlotScene.cpp

@@ -0,0 +1,51 @@
+/*
+	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 <cmath>
+#include "AnalysisPlotScene.h"
+
+using namespace std;
+
+AnalysisPlotScene::AnalysisPlotScene(QObject* parent)
+	: FrequencyPlotScene(parent)
+{
+
+}
+
+void AnalysisPlotScene::setFreqData(fftwf_complex* freqData, int frameCount, unsigned sampleRate)
+{
+	nodes.clear();
+	for(int i = 0; i < frameCount / 2; i++)
+	{
+		float freq = (i * 1.0f / frameCount) * sampleRate;
+		// GainIterator can't handle 0 Hz node
+		if(freq == 0.0f)
+			freq = 0.001f;
+		float gain = sqrt(freqData[i][0] * freqData[i][0] + freqData[i][1] * freqData[i][1]);
+		float dbGain = log10(gain) * 20;
+		nodes.push_back(FilterNode(freq, dbGain));
+	}
+
+	update();
+}
+
+vector<FilterNode> AnalysisPlotScene::getNodes() const
+{
+	return nodes;
+}