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/widgets/FrequencyPlotVRuler.cpp

@@ -17,6 +17,8 @@
 	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+#include <QWheelEvent>
+
 #include "FrequencyPlotView.h"
 #include "FrequencyPlotScene.h"
 #include "FrequencyPlotVRuler.h"
@@ -29,13 +31,13 @@ FrequencyPlotVRuler::FrequencyPlotVRuler(QWidget *parent) :
 void FrequencyPlotVRuler::paintEvent(QPaintEvent*)
 {
 	QPainter painter(this);
+	painter.setRenderHint(QPainter::Antialiasing);
 	FrequencyPlotView* view = qobject_cast<FrequencyPlotView*>(parentWidget());
-	FrequencyPlotScene* scene = view->scene();
+	FrequencyPlotScene* s = view->scene();
 
 	QPointF topLeft = view->mapToScene(0, 0);
 	QPointF bottomRight = view->mapToScene(view->viewport()->width(), view->viewport()->height());
-	double dbHeight = abs(scene->yToDb(topLeft.y()) - scene->yToDb(bottomRight.y()));
-	double dbStep = dbHeight / 4;
+	double dbStep = abs(s->yToDb(0) - s->yToDb(30));
 
 	double dbBase = pow(10, floor(log10(dbStep)));
 	if(dbStep >= 5 * dbBase)
@@ -45,16 +47,58 @@ void FrequencyPlotVRuler::paintEvent(QPaintEvent*)
 	else
 		dbStep = dbBase;
 
-	double fromDb = floor(scene->yToDb(topLeft.y()) / dbStep) * dbStep;
-	double toDb = ceil(scene->yToDb(bottomRight.y()) / dbStep) * dbStep;
+	double fromDb = floor(s->yToDb(topLeft.y()) / dbStep) * dbStep;
+	double toDb = ceil(s->yToDb(bottomRight.y()) / dbStep) * dbStep;
 
 	painter.setPen(QColor(50, 50, 50));
 	for(double db = toDb; db <= fromDb; db += dbStep)
 	{
 		if(abs(db) < 1e-6)
 			db = 0;
-		double y = scene->dbToY(db);
+		double y = s->dbToY(db);
 		if(y != -1)
 			painter.drawText(0, y - topLeft.y() - 1, width(), 0, Qt::TextDontClip | Qt::AlignCenter, QString("%0").arg(db));
 	}
+
+	QPoint mousePos = view->getLastMousePos();
+	if(!mousePos.isNull())
+	{
+		QPointF mouseScenePos = view->mapToScene(mousePos);
+
+		double db = s->yToDb(mouseScenePos.y());
+		double y = s->dbToY(db);
+		if(y != -1)
+		{
+			QString text = QString("%0").arg(db, 0, 'f', 1);
+			QFontMetrics metrics = painter.fontMetrics();
+			QRectF rect = metrics.boundingRect(text);
+			float center = y - topLeft.y() - 1;
+			rect = QRectF(ceil(width() / 2) - ceil(rect.width() / 2) - 2.5, center - rect.height() / 2 + 1, rect.width() + 3, rect.height());
+			QPainterPath path;
+			path.addRect(rect);
+			QPainterPath rightTriangle;
+			rightTriangle.moveTo(QPoint(rect.right(), center - 2));
+			rightTriangle.lineTo(QPoint(rect.right(), center + 4));
+			rightTriangle.lineTo(QPoint(rect.right() + 4, center + 1));
+			path = path.united(rightTriangle);
+
+			painter.setPen(Qt::black);
+			painter.setBrush(Qt::white);
+			painter.drawPath(path);
+			painter.setPen(Qt::blue);
+			painter.drawText(0, center, width() - 2, 0, Qt::TextDontClip | Qt::AlignCenter, text);
+		}
+	}
+}
+
+void FrequencyPlotVRuler::wheelEvent(QWheelEvent* event)
+{
+	FrequencyPlotView* view = qobject_cast<FrequencyPlotView*>(parentWidget());
+	view->zoom(0, event->angleDelta().y(), 0, event->y());
+}
+
+void FrequencyPlotVRuler::mouseMoveEvent(QMouseEvent* event)
+{
+	FrequencyPlotView* view = qobject_cast<FrequencyPlotView*>(parentWidget());
+	view->setLastMousePos(QPoint(0, min(event->y(), view->viewport()->height() - 1)));
 }