Scale planet halo properly

src/core/StelSkyDrawer.cpp

@@ -540,6 +540,7 @@ void StelSkyDrawer::drawSunCorona(StelPainter* painter, const Vec3f& v, float ra
 // Terminate drawing of a 3D model, draw the halo
 void StelSkyDrawer::postDrawSky3dModel(StelPainter* painter, const Vec3d& v, float illuminatedArea, float mag, const Vec3f& color, const bool isSun)
 {
+	const float scale = StelApp::getInstance().getScreenScale();
 	const float pixPerRad = painter->getProjector()->getPixelPerRadAtCenter();
 	// Assume a disk shape
 	float pixRadius = std::sqrt(illuminatedArea/(60.f*60.f)*M_PI_180f*M_PI_180f*(pixPerRad*pixPerRad))/M_PIf;
@@ -581,8 +582,8 @@ void StelSkyDrawer::postDrawSky3dModel(StelPainter* painter, const Vec3d& v, flo
 	// so that the radius of the halo is small enough to be not visible (so that we see the disk)
 
 	// TODO: Change drawing halo to more realistic view of stars and planets
-	float tStart = 3.f; // Was 2.f: planet's halo is too dim. Atque 2020-11-12: No need to change these anymore. It appears that this has to do with halo size vs FOV (?).
-	float tStop = 6.f;
+	float tStart = 3.f*scale; // Was 2.f: planet's halo is too dim. Atque 2020-11-12: No need to change these anymore. It appears that this has to do with halo size vs FOV (?).
+	float tStop = 6.f*scale;
 	bool truncated=false;
 
 	float maxHaloRadius = qMax(tStart*6.f, pixRadius*3.f); //Atque 2020-11-12: Careful, if tStart*6.f is too big (tStart*10.f or something), the Moon gets a ridiculously big halo.