NFM and SSB receiver in focus trigger the display of the central frequency line on the spectrum frequency scale thus facilitating its identification

Readme.md

@@ -76,6 +76,7 @@ Done since the fork
   - Added display and precise control of the shift frequency from center frequency of the SSB receivers.
   - Make the sidebands appear correctly on SSB channel overlay. Limit to +/- 6 kHz to fit channel spectrum analyzer window
   - SSB bandwidth can now be tuned in steps of 100 Hz
+  - NFM and SSB receiver in focus trigger the display of the central frequency line on the spectrum frequency scale thus facilitating its identification
   
   
 =====

include-gpl/gui/glspectrum.h

@@ -148,6 +148,8 @@ private:
 	void enterEvent(QEvent* event);
 	void leaveEvent(QEvent* event);
 
+	float getCenterFreqLineRelPos(ChannelMarker *channelMarker);
+
 private slots:
 	void tick();
 	void channelMarkerChanged();

include/dsp/channelmarker.h

@@ -33,6 +33,9 @@ public:
 	void setVisible(bool visible);
 	bool getVisible() const { return m_visible; }
 
+	void setHighlighted(bool highlighted);
+	bool getHighlighted() const { return m_highlighted; }
+
 	void setColor(const QColor& color);
 	const QColor& getColor() const { return m_color; }
 
@@ -45,6 +48,7 @@ protected:
 	int m_bandwidth;
 	sidebands_t m_sidebands;
 	bool m_visible;
+	bool m_highlighted;
 	QColor m_color;
 
 signals:

plugins/channel/nfm/nfmdemodgui.cpp

@@ -222,3 +222,14 @@ void NFMDemodGUI::applySettings()
 		ui->volume->value() / 10.0,
 		ui->squelch->value());
 }
+
+void NFMDemodGUI::leaveEvent(QEvent*)
+{
+	m_channelMarker->setHighlighted(false);
+}
+
+void NFMDemodGUI::enterEvent(QEvent*)
+{
+	m_channelMarker->setHighlighted(true);
+}
+

plugins/channel/nfm/nfmdemodgui.h

@@ -61,6 +61,9 @@ private:
 	~NFMDemodGUI();
 
 	void applySettings();
+
+	void leaveEvent(QEvent*);
+	void enterEvent(QEvent*);
 };
 
 #endif // INCLUDE_NFMDEMODGUI_H

plugins/channel/ssb/ssbdemodgui.cpp

@@ -209,3 +209,14 @@ void SSBDemodGUI::applySettings()
 		ui->BW->value() * 100.0,
 		ui->volume->value() / 10.0 );
 }
+
+void SSBDemodGUI::leaveEvent(QEvent*)
+{
+	m_channelMarker->setHighlighted(false);
+}
+
+void SSBDemodGUI::enterEvent(QEvent*)
+{
+	m_channelMarker->setHighlighted(true);
+}
+

plugins/channel/ssb/ssbdemodgui.h

@@ -57,6 +57,9 @@ private:
 	~SSBDemodGUI();
 
 	void applySettings();
+
+	void leaveEvent(QEvent*);
+	void enterEvent(QEvent*);
 };
 
 #endif // INCLUDE_SSBDEMODGUI_H

sdrbase/dsp/channelmarker.cpp

@@ -31,6 +31,7 @@ ChannelMarker::ChannelMarker(QObject* parent) :
 	m_bandwidth(0),
 	m_sidebands(dsb),
 	m_visible(false),
+	m_highlighted(false),
 	m_color(m_colorTable[m_nextColor])
 {
 	++m_nextColor;
@@ -68,6 +69,12 @@ void ChannelMarker::setVisible(bool visible)
 	emit changed();
 }
 
+void ChannelMarker::setHighlighted(bool highlighted)
+{
+	m_highlighted = highlighted;
+	emit changed();
+}
+
 void ChannelMarker::setColor(const QColor& color)
 {
 	m_color = color;

sdrbase/gui/glspectrum.cpp

@@ -544,7 +544,7 @@ void GLSpectrum::paintGL()
 			for(int i = 0; i < m_channelMarkerStates.size(); ++i) {
 				ChannelMarkerState* dv = m_channelMarkerStates[i];
 				if(dv->m_channelMarker->getVisible()) {
-
+					/*
 					ChannelMarker::sidebands_t sidebands = dv->m_channelMarker->getSidebands();
 					float fcLineRelativePos;
 					if (sidebands == ChannelMarker::usb) {
@@ -554,7 +554,7 @@ void GLSpectrum::paintGL()
 					} else {
 						fcLineRelativePos = 0.5;
 					}
-
+					*/
 					glEnable(GL_BLEND);
 					glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 					glColor4f(dv->m_channelMarker->getColor().redF(), dv->m_channelMarker->getColor().greenF(), dv->m_channelMarker->getColor().blueF(), 0.3f);
@@ -570,8 +570,8 @@ void GLSpectrum::paintGL()
 					glDisable(GL_BLEND);
 					glColor3f(0.8f, 0.8f, 0.6f);
 					glBegin(GL_LINE_LOOP);
-					glVertex2f(fcLineRelativePos, 0);
+					glVertex2f(getCenterFreqLineRelPos(dv->m_channelMarker), 0);
-					glVertex2f(fcLineRelativePos, 1);
+					glVertex2f(getCenterFreqLineRelPos(dv->m_channelMarker), 1);
 					glEnd();
 					glPopMatrix();
 				}
@@ -667,6 +667,15 @@ void GLSpectrum::paintGL()
 				glVertex2f(1, 1);
 				glVertex2f(0, 1);
 				glEnd();
+
+				if (dv->m_channelMarker->getHighlighted()) {
+					glColor3f(0.8f, 0.8f, 0.6f);
+					glBegin(GL_LINE_LOOP);
+					glVertex2f(getCenterFreqLineRelPos(dv->m_channelMarker), 0);
+					glVertex2f(getCenterFreqLineRelPos(dv->m_channelMarker), 1);
+					glEnd();
+				}
+
 				glDisable(GL_BLEND);
 				glPopMatrix();
 			}
@@ -1325,3 +1334,16 @@ void GLSpectrum::channelMarkerDestroyed(QObject* object)
 {
 	removeChannelMarker((ChannelMarker*)object);
 }
+
+float GLSpectrum::getCenterFreqLineRelPos(ChannelMarker *channelMarker)
+{
+	ChannelMarker::sidebands_t sidebands = channelMarker->getSidebands();
+
+	if (sidebands == ChannelMarker::usb) {
+		return 0.0;
+	} else if (sidebands == ChannelMarker::lsb) {
+		return 1.0;
+	} else {
+		return 0.5;
+	}
+}