Set coordinates for center of screen in Search Tool (see #2960)

Stellarium · Feb 26, 2024 · 93bbfb8 · 93bbfb8
1 parent ff75e87
commit 93bbfb8
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diff --git a/src/gui/SearchDialog.cpp b/src/gui/SearchDialog.cpp
@@ -353,6 +353,7 @@ void SearchDialog::setCoordinateSystem(int csID)
 	ui->AxisXSpinBox->setRadians(0.);
 	ui->AxisYSpinBox->setRadians(0.);
 	conf->setValue("search/coordinate_system", currentCoordinateSystemID);
+	setCenterOfScreenCoordinates();
 }
 
 // Initialize the dialog widgets and connect the signals/slots
@@ -393,6 +394,7 @@ void SearchDialog::createDialogContent()
 	connect(ui->AxisXSpinBox, SIGNAL(valueChanged()), this, SLOT(manualPositionChanged()));
 	connect(ui->AxisYSpinBox, SIGNAL(valueChanged()), this, SLOT(manualPositionChanged()));
 	connect(ui->goPushButton, SIGNAL(clicked(bool)), this, SLOT(manualPositionChanged()));
+	setCenterOfScreenCoordinates();
 
 	connect(ui->alphaPushButton, SIGNAL(clicked(bool)), this, SLOT(greekLetterClicked()));
 	connect(ui->betaPushButton, SIGNAL(clicked(bool)), this, SLOT(greekLetterClicked()));
@@ -667,6 +669,69 @@ void SearchDialog::setSimpleStyle()
 	ui->coordinateSystemComboBox->setVisible(false);
 }
 
+void SearchDialog::setCenterOfScreenCoordinates()
+{
+	StelCore *core = StelApp::getInstance().getCore();
+	const auto projector = core->getProjection(StelCore::FrameJ2000, StelCore::RefractionMode::RefractionOff);
+	Vec2i centerScreen(projector->getViewportPosX() + projector->getViewportWidth() / 2,
+			   projector->getViewportPosY() + projector->getViewportHeight() / 2);
+	Vec3d centerPos;
+	projector->unProject(centerScreen[0], centerScreen[1], centerPos);
+	double spinLong, spinLat;
+
+	switch (getCurrentCoordinateSystem())
+	{
+		case equatorialJ2000:
+			StelUtils::rectToSphe(&spinLong, &spinLat, centerPos);
+			break;
+		case equatorial:
+			StelUtils::rectToSphe(&spinLong, &spinLat, core->j2000ToEquinoxEqu(centerPos, StelCore::RefractionOff));
+			break;
+		case galactic:
+			StelUtils::rectToSphe(&spinLong, &spinLat, core->j2000ToGalactic(centerPos));
+			break;
+		case supergalactic:
+			StelUtils::rectToSphe(&spinLong, &spinLat, core->j2000ToSupergalactic(centerPos));
+			break;
+		case horizontal:
+		{
+			StelUtils::rectToSphe(&spinLong, &spinLat, core->j2000ToAltAz(centerPos, StelCore::RefractionAuto));
+			spinLong = 3.*M_PI - spinLong; // N is zero, E is 90 degrees
+			if (spinLong > M_PI*2)
+				spinLong -= M_PI*2;
+			break;
+		}
+		case eclipticJ2000:
+		{
+			double lambda, beta;
+			StelUtils::rectToSphe(&spinLong, &spinLat, centerPos);
+			StelUtils::equToEcl(spinLong, spinLat, GETSTELMODULE(SolarSystem)->getEarth()->getRotObliquity(2451545.0), &lambda, &beta);
+			if (lambda<0) lambda+=2.0*M_PI;
+			spinLong = lambda;
+			spinLat = beta;
+			break;
+		}
+		case ecliptic:
+		{
+			double lambda, beta;
+			StelUtils::rectToSphe(&spinLong, &spinLat, core->j2000ToEquinoxEqu(centerPos, StelCore::RefractionOff));
+			StelUtils::equToEcl(spinLong, spinLat, GETSTELMODULE(SolarSystem)->getEarth()->getRotObliquity(core->getJDE()), &lambda, &beta);
+			if (lambda<0) lambda+=2.0*M_PI;
+			spinLong = lambda;
+			spinLat = beta;
+			break;
+		}
+	}
+
+	ui->AxisXSpinBox->blockSignals(true);
+	ui->AxisYSpinBox->blockSignals(true);
+
+	ui->AxisXSpinBox->setRadians(spinLong);
+	ui->AxisYSpinBox->setRadians(spinLat);
+
+	ui->AxisXSpinBox->blockSignals(false);
+	ui->AxisYSpinBox->blockSignals(false);
+}
 
 void SearchDialog::manualPositionChanged()
 {

diff --git a/src/gui/SearchDialog.hpp b/src/gui/SearchDialog.hpp
@@ -250,6 +250,8 @@ private slots:
 	//! Clear recent list's data
 	void recentSearchClearDataClicked();
 
+	void setCenterOfScreenCoordinates();
+
 private:
 	bool simbadSearchEnabled() const {return useSimbad;}
 	int  getSimbadQueryDist () const { return simbadDist;}