StelSkyDrawer Class Reference

Provide a set of methods used to draw sky objects taking into account eyes adaptation, zoom level and instrument model. More...

#include <StelSkyDrawer.hpp>

List of all members.

Classes
struct	ColoredTexturedVertex
	2D vertex with position, color and texture coordinate.
struct	ColoredVertex
	2D vertex with position and color.
Public Slots
void	setRelativeStarScale (double b=1.0)
	Set the way brighter stars will look bigger as the fainter ones.
float	getRelativeStarScale () const
	Get the way brighter stars will look bigger as the fainter ones.
void	setAbsoluteStarScale (double b=1.0)
	Set the absolute star brightness scale.
float	getAbsoluteStarScale () const
	Get the absolute star brightness scale.
void	setTwinkleAmount (double b)
	Set source twinkle amount.
float	getTwinkleAmount () const
	Get source twinkle amount.
void	setFlagTwinkle (bool b)
	Set flag for source twinkling.
bool	getFlagTwinkle () const
	Get flag for source twinkling.
void	setDrawStarsAsPoints (bool b)
	Set flag for displaying point sources as points (faster on some hardware but not so nice).
bool	getDrawStarsAsPoints () const
	Get flag for displaying point sources as points (faster on some hardware but not so nice).
void	setBortleScale (int index)
	Set the parameters so that the stars disapear at about the limit given by the bortle scale The limit is valid only at a given zoom level (around 60 deg) See http://en.wikipedia.org/wiki/Bortle_Dark-Sky_Scale.
int	getBortleScale () const
	Get the current Bortle scale index.
float	getLimitMagnitude () const
	Get the magnitude of the currently faintest visible point source It depends on the zoom level, on the eye adapation and on the point source rendering parameters.
float	getLimitLuminance () const
	Get the luminance of the faintest visible object (e.g.
void	setFlagLuminanceAdaptation (bool b)
	Set the value of the eye adaptation flag.
bool	getFlagLuminanceAdaptation () const
	Get the current value of eye adaptation flag.
void	setFlagHasAtmosphere (bool b)
	Informing the drawer whether atmosphere is displayed.
bool	getFlagHasAtmosphere () const
	This is used to decide whether to apply refraction/extinction before rendering point sources et al.
void	setExtinctionCoefficient (double extCoeff)
	Set extinction coefficient, mag/airmass (for extinction).
double	getExtinctionCoefficient () const
	Get extinction coefficient, mag/airmass (for extinction).
void	setAtmosphereTemperature (double celsius)
	Set atmospheric (ground) temperature in deg celsius (for refraction).
double	getAtmosphereTemperature () const
	Get atmospheric (ground) temperature in deg celsius (for refraction).
void	setAtmospherePressure (double mbar)
	Set atmospheric (ground) pressure in mbar (for refraction).
double	getAtmospherePressure () const
	Get atmospheric (ground) pressure in mbar (for refraction).
const Extinction &	getExtinction () const
	Get the current valid extinction computation class.
const Refraction &	getRefraction () const
	Get the current valid fefraction computation class.
float	getBig3dModelHaloRadius () const
	Get the radius of the big halo texture used when a 3d model is very bright.
void	setBig3dModelHaloRadius (float r)
	Set the radius of the big halo texture used when a 3d model is very bright.
Public Member Functions
	StelSkyDrawer (StelCore core, class StelRenderer renderer)
	Constructor.
	~StelSkyDrawer ()
	Destructor.
void	init ()
	Init parameters from config file.
void	update (double deltaTime)
	Update with respect to the time and StelProjector/StelToneReproducer state.
void	preDrawPointSource ()
	Prepare to draw point sources (must be called before drawing).
void	postDrawPointSource (StelProjectorP projector)
	Finalize the drawing of point sources.
bool	pointSourceVisible (StelProjector *projector, const Vec3f &v, const float rcMag[2], bool checkInScreen, Vec3f &outWindowCoordinates)
	Determine if a point source is visible (should be drawn).
void	drawPointSource (const Vec3f &win, const float rcMag[2], unsigned int bV)
	Draw a point source halo.
void	drawPointSource (const Vec3f &win, const float rcMag[2], const Vec3f &bcolor)
void	drawSunCorona (StelProjectorP projector, const Vec3d &v, float radius, float alpha)
	Draw's the sun's corona during a solar eclipse on earth.
void	postDrawSky3dModel (StelProjectorP projector, const Vec3d &v, float illuminatedArea, float mag, const Vec3f &color=Vec3f(1.f, 1.f, 1.f))
	Terminate drawing of a 3D model, draw the halo.
bool	computeRCMag (float mag, float rcMag[2]) const
	Compute RMag and CMag from magnitude.
void	reportLuminanceInFov (float lum, bool fastAdaptation=false)
	Report that an object of luminance lum with an on-screen area of area pixels is currently displayed This information is used to determine the world adaptation luminance This method should be called during the update operations of the main loop.
void	preDraw ()
	To be called before the drawing stage starts.
Static Public Member Functions
static float	surfacebrightnessToLuminance (float sb)
	Compute the luminance for an extended source with the given surface brightness.
static float	luminanceToSurfacebrightness (float lum)
	Compute the surface brightness from the luminance of an extended source.
static float	indexToBV (unsigned char bV)
	Convert quantized B-V index to float B-V.
static const Vec3f &	indexToColor (unsigned char bV)
	Convert quantized B-V index to RGB colors.

Detailed Description

Provide a set of methods used to draw sky objects taking into account eyes adaptation, zoom level and instrument model.

Definition at line 39 of file StelSkyDrawer.hpp.

Constructor & Destructor Documentation

StelSkyDrawer::StelSkyDrawer	(	StelCore *	core,
		class StelRenderer *	renderer
	)

Constructor.

StelSkyDrawer::~StelSkyDrawer ( )

Destructor.

Member Function Documentation

bool StelSkyDrawer::computeRCMag	(	float	mag,
		float	rcMag[2]
	)			const

Compute RMag and CMag from magnitude.

Parameters:

	mag	the object integrated V magnitude
	rcMag	array of 2 floats containing the radius and luminance

Returns:: false if the object is too faint to be displayed

void StelSkyDrawer::drawPointSource	(	const Vec3f &	win,
		const float	rcMag[2],
		unsigned int	bV
	)			`[inline]`

Draw a point source halo.

This is used in combination with pointSourceVisible (which avoids unnecessary draws and projects a point source to window coordinates).

Example:

 Vec3f win;
 if(skyDrawer->pointSourceVisible(&(*projector), pos3D, rcMag, checkInScreen, win))
 {
    skyDrawer->drawPointSource(win, rcMag, bV);
 }

Parameters:

	win	Coordinates of the point source in the window (computed by pointSourceVisible)
	rcMag	the radius and luminance of the source as computed by computeRCMag()
	bV	the source B-V index

Definition at line 103 of file StelSkyDrawer.hpp.

void StelSkyDrawer::drawSunCorona	(	StelProjectorP	projector,
		const Vec3d &	v,
		float	radius,
		float	alpha
	)

Draw's the sun's corona during a solar eclipse on earth.

float StelSkyDrawer::getAbsoluteStarScale ( ) const [inline, slot]

Get the absolute star brightness scale.

Definition at line 167 of file StelSkyDrawer.hpp.

double StelSkyDrawer::getAtmospherePressure ( ) const [inline, slot]

Get atmospheric (ground) pressure in mbar (for refraction).

Definition at line 223 of file StelSkyDrawer.hpp.

double StelSkyDrawer::getAtmosphereTemperature ( ) const [inline, slot]

Get atmospheric (ground) temperature in deg celsius (for refraction).

Definition at line 219 of file StelSkyDrawer.hpp.

float StelSkyDrawer::getBig3dModelHaloRadius ( ) const [inline, slot]

Get the radius of the big halo texture used when a 3d model is very bright.

Definition at line 231 of file StelSkyDrawer.hpp.

int StelSkyDrawer::getBortleScale ( ) const [inline, slot]

Get the current Bortle scale index.

Definition at line 189 of file StelSkyDrawer.hpp.

bool StelSkyDrawer::getDrawStarsAsPoints ( ) const [inline, slot]

Get flag for displaying point sources as points (faster on some hardware but not so nice).

Definition at line 182 of file StelSkyDrawer.hpp.

const Extinction& StelSkyDrawer::getExtinction ( ) const [inline, slot]

Get the current valid extinction computation class.

Definition at line 226 of file StelSkyDrawer.hpp.

double StelSkyDrawer::getExtinctionCoefficient ( ) const [inline, slot]

Get extinction coefficient, mag/airmass (for extinction).

Definition at line 215 of file StelSkyDrawer.hpp.

bool StelSkyDrawer::getFlagHasAtmosphere ( ) const [inline, slot]

This is used to decide whether to apply refraction/extinction before rendering point sources et al.

Definition at line 210 of file StelSkyDrawer.hpp.

bool StelSkyDrawer::getFlagLuminanceAdaptation ( ) const [inline, slot]

Get the current value of eye adaptation flag.

Definition at line 204 of file StelSkyDrawer.hpp.

bool StelSkyDrawer::getFlagTwinkle ( ) const [inline, slot]

Get flag for source twinkling.

Definition at line 177 of file StelSkyDrawer.hpp.

float StelSkyDrawer::getLimitLuminance ( ) const [inline, slot]

Get the luminance of the faintest visible object (e.g.

RGB<0.05) It depends on the zoom level, on the eye adapation and on the point source rendering parameters

Returns:: the limit V luminance at which an object will be visible

Definition at line 199 of file StelSkyDrawer.hpp.

float StelSkyDrawer::getLimitMagnitude ( ) const [inline, slot]

Get the magnitude of the currently faintest visible point source It depends on the zoom level, on the eye adapation and on the point source rendering parameters.

Returns:: the limit V mag at which a point source will be displayed

Definition at line 194 of file StelSkyDrawer.hpp.

const Refraction& StelSkyDrawer::getRefraction ( ) const [inline, slot]

Get the current valid fefraction computation class.

Definition at line 228 of file StelSkyDrawer.hpp.

float StelSkyDrawer::getRelativeStarScale ( ) const [inline, slot]

Get the way brighter stars will look bigger as the fainter ones.

Definition at line 162 of file StelSkyDrawer.hpp.

float StelSkyDrawer::getTwinkleAmount ( ) const [inline, slot]

Get source twinkle amount.

Definition at line 172 of file StelSkyDrawer.hpp.

static float StelSkyDrawer::indexToBV ( unsigned char bV ) [inline, static]

Convert quantized B-V index to float B-V.

Definition at line 147 of file StelSkyDrawer.hpp.

static const Vec3f& StelSkyDrawer::indexToColor ( unsigned char bV ) [inline, static]

Convert quantized B-V index to RGB colors.

Definition at line 153 of file StelSkyDrawer.hpp.

void StelSkyDrawer::init ( )

Init parameters from config file.

static float StelSkyDrawer::luminanceToSurfacebrightness ( float lum ) [static]

Compute the surface brightness from the luminance of an extended source.

Parameters:

lum

luminance in cd/m^2

Returns:: surface brightness in V magnitude/arcmin^2

bool StelSkyDrawer::pointSourceVisible	(	StelProjector *	projector,
		const Vec3f &	v,
		const float	rcMag[2],
		bool	checkInScreen,
		Vec3f &	outWindowCoordinates
	)			`[inline]`

Determine if a point source is visible (should be drawn).

This function is separate from drawPointSource for optimization.

Also projects the point source to window coordinates.

Parameters:

	projector	Projector to project the point source.
	v	the 3d position of the source in J2000 reference frame
	rcMag	the radius and luminance of the source as computed by computeRCMag()
	checkInScreen	Whether source in screen should be checked to avoid unnecessary drawing.
	outWindowCoordinates	Window coordinates out the point source are written here.

Returns:: true if the point source is visible, false otherwise.

Definition at line 75 of file StelSkyDrawer.hpp.

void StelSkyDrawer::postDrawPointSource ( StelProjectorP projector )

Finalize the drawing of point sources.

void StelSkyDrawer::postDrawSky3dModel	(	StelProjectorP	projector,
		const Vec3d &	v,
		float	illuminatedArea,
		float	mag,
		const Vec3f &	color = `Vec3f(1.f, 1.f, 1.f)`
	)

Terminate drawing of a 3D model, draw the halo.

Parameters:

	projector	Projector to use for this drawing operation
	v	the 3d position of the source in J2000 reference frame
	illuminatedArea	the illuminated area in arcmin^2
	mag	the source integrated magnitude
	color	the object halo RGB color

void StelSkyDrawer::preDraw ( )

To be called before the drawing stage starts.

void StelSkyDrawer::preDrawPointSource ( )

Prepare to draw point sources (must be called before drawing).

void StelSkyDrawer::reportLuminanceInFov	(	float	lum,
		bool	fastAdaptation = `false`
	)

Report that an object of luminance lum with an on-screen area of area pixels is currently displayed This information is used to determine the world adaptation luminance This method should be called during the update operations of the main loop.

Parameters:

	lum	luminance in cd/m^2
	fastAdaptation	adapt the eye quickly if true, other wise use a smooth adaptation

void StelSkyDrawer::setAbsoluteStarScale ( double b = 1.0 ) [inline, slot]

Set the absolute star brightness scale.

Definition at line 165 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setAtmospherePressure ( double mbar ) [inline, slot]

Set atmospheric (ground) pressure in mbar (for refraction).

Definition at line 221 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setAtmosphereTemperature ( double celsius ) [inline, slot]

Set atmospheric (ground) temperature in deg celsius (for refraction).

Definition at line 217 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setBig3dModelHaloRadius ( float r ) [inline, slot]

Set the radius of the big halo texture used when a 3d model is very bright.

Definition at line 233 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setBortleScale ( int index ) [slot]

Set the parameters so that the stars disapear at about the limit given by the bortle scale The limit is valid only at a given zoom level (around 60 deg) See http://en.wikipedia.org/wiki/Bortle_Dark-Sky_Scale.

void StelSkyDrawer::setDrawStarsAsPoints ( bool b ) [inline, slot]

Set flag for displaying point sources as points (faster on some hardware but not so nice).

Definition at line 180 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setExtinctionCoefficient ( double extCoeff ) [inline, slot]

Set extinction coefficient, mag/airmass (for extinction).

Definition at line 213 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setFlagHasAtmosphere ( bool b ) [inline, slot]

Informing the drawer whether atmosphere is displayed.

This is used to avoid twinkling/simulate extinction/refraction.

Definition at line 208 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setFlagLuminanceAdaptation ( bool b ) [inline, slot]

Set the value of the eye adaptation flag.

Definition at line 202 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setFlagTwinkle ( bool b ) [inline, slot]

Set flag for source twinkling.

Definition at line 175 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setRelativeStarScale ( double b = 1.0 ) [inline, slot]

Set the way brighter stars will look bigger as the fainter ones.

Definition at line 160 of file StelSkyDrawer.hpp.

void StelSkyDrawer::setTwinkleAmount ( double b ) [inline, slot]

Set source twinkle amount.

Definition at line 170 of file StelSkyDrawer.hpp.

static float StelSkyDrawer::surfacebrightnessToLuminance ( float sb ) [static]

Compute the luminance for an extended source with the given surface brightness.

Parameters:

sb

surface brightness in V magnitude/arcmin^2

Returns:: the luminance in cd/m^2

void StelSkyDrawer::update ( double deltaTime )

Update with respect to the time and StelProjector/StelToneReproducer state.

Parameters:

deltaTime

the time increment in second since last call.

The documentation for this class was generated from the following file:

core/StelSkyDrawer.hpp

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StelSkyDrawer Class Reference

Classes

Public Slots

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation