StelProjectorStereographic Class Reference

List of all members.

Classes
class	StereographicGLSLProjector
	GLSL projector code for StelProjectorStereographic.
Public Member Functions
	StelProjectorStereographic (ModelViewTranformP func)
virtual QString	getNameI18 () const
	Get a human-readable name for this projection type.
virtual QString	getDescriptionI18 () const
	Get a human-readable short description for this projection type.
virtual float	getMaxFov () const
	Get the maximum FOV apperture in degree.
bool	forward (Vec3f &v) const
	Apply the transformation in the forward direction in place.
virtual void	project (int n, const Vec3d *in, Vec3f *out)
virtual GLSLProjector *	getGLSLProjector ()
	Return the GLSLProjector to provide GLSL projection functionality.
bool	backward (Vec3d &v) const
	Apply the transformation in the backward projection in place.
float	fovToViewScalingFactor (float fov) const
	Convert a Field Of View radius value in radians in ViewScalingFactor (used internally).
float	viewScalingFactorToFov (float vsf) const
	Convert a ViewScalingFactor value (used internally) in Field Of View radius in radians.
float	deltaZoom (float fov) const
	Return the small zoom increment to use at the given FOV for nice movements.
Protected Member Functions
virtual bool	hasDiscontinuity () const
	Return whether the projection presents discontinuities. Used for optimization.
virtual bool	intersectViewportDiscontinuityInternal (const Vec3d &, const Vec3d &) const
	Determine whether a great circle connection p1 and p2 intersects with a projection discontinuity.
virtual bool	intersectViewportDiscontinuityInternal (const Vec3d &, double) const
	Determine whether a cap intersects with a projection discontinuity.

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Detailed Description

Definition at line 91 of file StelProjectorClasses.hpp.

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Member Function Documentation

bool StelProjectorStereographic::backward

(

Vec3d &

v

)

const [virtual]

Apply the transformation in the backward projection in place.

Implements StelProjector.

float StelProjectorStereographic::deltaZoom

(

float

fov

)

const [virtual]

Return the small zoom increment to use at the given FOV for nice movements.

Implements StelProjector.

bool StelProjectorStereographic::forward

(

Vec3f &

v

)

const [inline, virtual]

Apply the transformation in the forward direction in place.

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.

Definition at line 240 of file StelProjectorClasses.hpp.

float StelProjectorStereographic::fovToViewScalingFactor

(

float

fov

)

const [virtual]

Convert a Field Of View radius value in radians in ViewScalingFactor (used internally).

Implements StelProjector.

virtual QString StelProjectorStereographic::getDescriptionI18

(

)

const [virtual]

Get a human-readable short description for this projection type.

Reimplemented from StelProjector.

virtual GLSLProjector* StelProjectorStereographic::getGLSLProjector

(

)

[inline, virtual]

Return the GLSLProjector to provide GLSL projection functionality.

This can return NULL if the StelProjector implementation does not support GLSL projection.

Reimplemented from StelProjector.

Definition at line 272 of file StelProjectorClasses.hpp.

virtual float StelProjectorStereographic::getMaxFov

(

)

const [inline, virtual]

Get the maximum FOV apperture in degree.

Implements StelProjector.

Definition at line 239 of file StelProjectorClasses.hpp.

virtual QString StelProjectorStereographic::getNameI18

(

)

const [virtual]

Get a human-readable name for this projection type.

Implements StelProjector.

virtual bool StelProjectorStereographic::hasDiscontinuity

(

)

const [inline, protected, virtual]

Return whether the projection presents discontinuities. Used for optimization.

Implements StelProjector.

Definition at line 282 of file StelProjectorClasses.hpp.

virtual bool StelProjectorStereographic::intersectViewportDiscontinuityInternal	(	const Vec3d &	capN,
		double	capD
	)			const [inline, protected, virtual]

Determine whether a cap intersects with a projection discontinuity.

Implements StelProjector.

Definition at line 284 of file StelProjectorClasses.hpp.

virtual bool StelProjectorStereographic::intersectViewportDiscontinuityInternal	(	const Vec3d &	p1,
		const Vec3d &	p2
	)			const [inline, protected, virtual]

Determine whether a great circle connection p1 and p2 intersects with a projection discontinuity.

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.

Definition at line 283 of file StelProjectorClasses.hpp.

float StelProjectorStereographic::viewScalingFactorToFov

(

float

vsf

)

const [virtual]

Convert a ViewScalingFactor value (used internally) in Field Of View radius in radians.

Implements StelProjector.

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

• core/StelProjectorClasses.hpp