Public Member Functions
	StelProjectorEqualArea (ModelViewTranformP func)

virtual QString	getNameI18 () const Q_DECL_OVERRIDE
	Get a human-readable name for this projection type.

virtual QString	getDescriptionI18 () const Q_DECL_OVERRIDE
	Get a human-readable short description for this projection type.

virtual float	getMaxFov () const Q_DECL_OVERRIDE
	Get the maximum FOV apperture in degree.

virtual bool	forward (Vec3f &v) const Q_DECL_OVERRIDE
	Apply the transformation in the forward direction in place. More...

virtual bool	backward (Vec3d &v) const Q_DECL_OVERRIDE
	Apply the transformation in the backward projection in place.

virtual float	fovToViewScalingFactor (float fov) const Q_DECL_OVERRIDE
	Convert a Field Of View radius value in radians in ViewScalingFactor (used internally)

virtual float	viewScalingFactorToFov (float vsf) const Q_DECL_OVERRIDE
	Convert a ViewScalingFactor value (used internally) in Field Of View radius in radians.

virtual float	deltaZoom (float fov) const Q_DECL_OVERRIDE
	Return the small zoom increment to use at the given FOV for nice movements.

Public Member Functions inherited from StelProjector
virtual	~StelProjector ()
	Destructor.

QString	getHtmlSummary () const
	Get a HTML version of the short description for this projection type.

bool	intersectViewportDiscontinuity (const Vec3d &p1, const Vec3d &p2) const
	Determine whether a great circle connection p1 and p2 intersects with a projection discontinuity. More...

bool	intersectViewportDiscontinuity (const SphericalCap &cap) const

bool	getFlagGravityLabels () const
	Get the current state of the flag which decides whether to arrage labels so that they are aligned with the bottom of a 2d screen, or a 3d dome. More...

const Vec4i &	getViewport () const
	Get the lower left corner of the viewport and the width, height.

Vector2< qreal >	getViewportCenter () const
	Get the center of the viewport relative to the lower left corner of the screen.

Vector2< qreal >	getViewportCenterOffset () const

int	getViewportPosX () const
	Get the horizontal viewport offset in pixels.

int	getViewportPosY () const
	Get the vertical viewport offset in pixels.

int	getViewportWidth () const
	Get the viewport width in pixels.

int	getViewportHeight () const
	Get the viewport height in pixels.

qreal	getDevicePixelsPerPixel () const
	Get the number of device pixels per "Device Independent Pixels" (value is usually 1, but 2 for mac retina screens).

SphericalRegionP	getViewportConvexPolygon (float marginX=0., float marginY=0.) const
	Return a convex polygon on the sphere which includes the viewport in the current frame. More...

const SphericalCap &	getBoundingCap () const
	Return a SphericalCap containing the whole viewport.

float	getPixelPerRadAtCenter () const
	Get size of a radian in pixels at the center of the viewport disk.

float	getFov () const
	Get the current FOV diameter in degrees.

bool	needGlFrontFaceCW () const
	Get whether front faces need to be oriented in the clockwise direction.

bool	checkInViewport (const Vec3d &pos) const
	Check to see if a 2d position is inside the viewport. More...

bool	checkInViewport (const Vec3f &pos) const
	Check to see if a 2d position is inside the viewport. More...

Vec3d	viewPortIntersect (const Vec3d &p1, const Vec3d &p2) const
	Return the position where the 2 2D point p1 and p2 cross the viewport edge P1 must be inside the viewport and P2 outside (check with checkInViewport() before calling this method)

bool	project (const Vec3d &v, Vec3d &win) const
	Project the vector v from the current frame into the viewport. More...

bool	project (const Vec3f &v, Vec3f &win) const
	Project the vector v from the current frame into the viewport. More...

virtual void	project (int n, const Vec3d in, Vec3f out)

virtual void	project (int n, const Vec3f in, Vec3f out)

bool	projectInPlace (Vec3d &vd) const
	Project the vector v from the current frame into the viewport. More...

bool	projectInPlace (Vec3f &v) const
	Project the vector v from the current frame into the viewport. More...

bool	projectCheck (const Vec3d &v, Vec3d &win) const
	Project the vector v from the current frame into the viewport. More...

bool	projectCheck (const Vec3f &v, Vec3f &win) const
	Project the vector v from the current frame into the viewport. More...

bool	unProject (const Vec3d &win, Vec3d &v) const
	Project the vector v from the viewport frame into the current frame. More...

bool	unProject (double x, double y, Vec3d &v) const

bool	projectLineCheck (const Vec3d &v1, Vec3d &win1, const Vec3d &v2, Vec3d &win2) const
	Project the vectors v1 and v2 from the current frame into the viewport. More...

ModelViewTranformP	getModelViewTransform () const
	Get the current model view matrix.

Mat4f	getProjectionMatrix () const
	Get the current projection matrix.

StelProjectorMaskType	getMaskType (void) const
	Get the current type of the mask if any.

Protected Member Functions
virtual bool	hasDiscontinuity () const Q_DECL_OVERRIDE
	Return whether the projection presents discontinuities. Used for optimization.

virtual bool	intersectViewportDiscontinuityInternal (const Vec3d &, const Vec3d &) const Q_DECL_OVERRIDE
	Determine whether a great circle connection p1 and p2 intersects with a projection discontinuity. More...

virtual bool	intersectViewportDiscontinuityInternal (const Vec3d &, double) const Q_DECL_OVERRIDE
	Determine whether a cap intersects with a projection discontinuity.

Protected Member Functions inherited from StelProjector
	StelProjector (ModelViewTranformP amodelViewTransform)
	Private constructor. Only StelCore can create instances of StelProjector.

virtual void	computeBoundingCap ()
	Initialize the bounding cap.

Additional Inherited Members
Public Types inherited from StelProjector
enum	StelProjectorMaskType { MaskNone, MaskDisk }
	Define viewport mask types. More...

typedef QSharedPointer< ModelViewTranform >	ModelViewTranformP
	Shared pointer on a ModelViewTranform instance (implement reference counting)

Static Public Member Functions inherited from StelProjector
static const QString	maskTypeToString (StelProjectorMaskType type)
	Get a string description of a StelProjectorMaskType.

static StelProjectorMaskType	stringToMaskType (const QString &s)
	Get a StelProjectorMaskType from a string description.

Protected Attributes inherited from StelProjector
ModelViewTranformP	modelViewTransform

float	flipHorz

float	flipVert

float	pixelPerRad

StelProjectorMaskType	maskType

double	zNear

double	oneOverZNearMinusZFar

Vec4i	viewportXywh

Vector2< qreal >	viewportCenter

Vector2< qreal >	viewportCenterOffset

qreal	viewportFovDiameter

bool	gravityLabels

float	defaultAngleForGravityText

SphericalCap	boundingCap

qreal	devicePixelsPerPixel

qreal	widthStretch

Member Function Documentation

◆ forward()

virtual bool StelProjectorEqualArea::forward ( Vec3f & v ) const

virtual

After transformation v[2] will always contain the length of the original v: sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]) regardless of the projection type. This makes it possible to implement depth buffer testing in a way independent of the projection type. I would like to return the squared length instead of the length because of performance reasons. But then far away objects are not textured any more, perhaps because of a depth buffer overflow although the depth test is disabled?

Implements StelProjector.

◆ intersectViewportDiscontinuityInternal()

virtual bool StelProjectorEqualArea::intersectViewportDiscontinuityInternal	(	const Vec3d &	p1,
		const Vec3d &	p2
	)		const

inlineprotectedvirtual

For many projections without discontinuity, this should return always false, but for other like cylindrical projection it will return true if the line cuts the wrap-around line (i.e. at lon=180 if the observer look at lon=0).

Implements StelProjector.

Public Member Functions

Protected Member Functions

Additional Inherited Members

Member Function Documentation

◆ forward()

◆ intersectViewportDiscontinuityInternal()