#include <equirectangularprojector.h>

Inheritance diagram for EquirectangularProjector:

Public Member Functions
	EquirectangularProjector (const ViewParams &p)

virtual SkyPoint	fromScreen (const QPointF &p, dms LST, const dms lat) const

virtual QVector< Vector2f >	groundPoly (SkyPoint labelpoint=0, bool drawLabel=0) const

virtual double	radius () const

virtual Vector2f	toScreenVec (const SkyPoint o, bool oRefract=true, bool onVisibleHemisphere=0) const

virtual SkyMap::Projection	type () const

virtual bool	unusablePoint (const QPointF &p) const

Public Member Functions inherited from Projector
	Projector (const ViewParams &p)

virtual	~Projector ()

bool	checkVisibility (SkyPoint *p) const

QPointF	clipLine (SkyPoint p1, SkyPoint p2) const

Vector2f	clipLineVec (SkyPoint p1, SkyPoint p2) const

double	findPA (SkyObject *o, float x, float y) const

double	fov () const

bool	onScreen (const QPointF &p) const

bool	onScreen (const Vector2f &p) const

void	setViewParams (const ViewParams &p)

QPointF	toScreen (const SkyPoint o, bool oRefract=true, bool onVisibleHemisphere=0) const

Additional Inherited Members
Protected Member Functions inherited from Projector
virtual double	cosMaxFieldAngle () const

virtual double	projectionK (double x) const

virtual double	projectionL (double x) const

Static Protected Member Functions inherited from Projector
static SkyPoint	pointAt (double az, KStarsData *data)

Protected Attributes inherited from Projector
double	m_cosY0

KStarsData *	m_data

double	m_fov

double	m_sinY0

ViewParams	m_vp

Detailed Description

Definition at line 27 of file equirectangularprojector.h.

Constructor & Destructor Documentation

EquirectangularProjector::EquirectangularProjector ( const ViewParams & p )

explicit

Definition at line 27 of file equirectangularprojector.cpp.

Member Function Documentation

SkyPoint EquirectangularProjector::fromScreen	(	const QPointF &	p,
		dms *	LST,
		const dms *	lat
	)		const

virtual

Determine RA, Dec coordinates of the pixel at (dx, dy), which are the screen pixel coordinate offsets from the center of the Sky pixmap.

Parameters

the	screen pixel position to convert
LST	pointer to the local sidereal time, as a dms object.
lat	pointer to the current geographic laitude, as a dms object

N.B. We don't cache these sin/cos values in the inverse projection because it causes 'shaking' when moving the sky.

Reimplemented from Projector.

Definition at line 73 of file equirectangularprojector.cpp.

QVector< Vector2f > EquirectangularProjector::groundPoly	(	SkyPoint *	labelpoint = `0`,
		bool *	drawLabel = `0`
	)		const

virtual

Get the ground polygon.

Parameters

labelpoint	This point will be set to something suitable for attaching a label
drawLabel	this tells whether to draw a label.

Returns: the ground polygon

Reimplemented from Projector.

Definition at line 109 of file equirectangularprojector.cpp.

double EquirectangularProjector::radius ( ) const

virtual

Get the radius of this projection's sky circle.

Returns: the radius in radians

Reimplemented from Projector.

Definition at line 38 of file equirectangularprojector.cpp.

Vector2f EquirectangularProjector::toScreenVec	(	const SkyPoint *	o,
		bool	oRefract = `true`,
		bool *	onVisibleHemisphere = `0`
	)		const

virtual

Given the coordinates of the SkyPoint argument, determine the pixel coordinates in the SkyMap.

Since most of the projections used by KStars are very similar, if this function were to be reimplemented in each projection subclass we would end up changing maybe 5 or 6 lines out of 150. Instead, we have a default implementation that uses the projectionK and projectionL functions to take care of the differences between e.g. Orthographic and Stereographic. There is also the cosMaxFieldAngle function, which is used for testing whether a point is on the visible part of the projection, and the radius function which gives the radius of the projection in screen coordinates.

While this seems ugly, it is less ugly than duplicating 150 loc to change 5.

Returns: Vector2f containing screen pixel x, y coordinates of SkyPoint.

Parameters

o	pointer to the SkyPoint for which to calculate x, y coordinates.
oRefract	true = use Options::useRefraction() value. false = do not use refraction. This argument is only needed for the Horizon, which should never be refracted.
onVisibleHemisphere	pointer to a bool to indicate whether the point is on the visible part of the Celestial Sphere.

Reimplemented from Projector.

Definition at line 43 of file equirectangularprojector.cpp.

SkyMap::Projection EquirectangularProjector::type ( ) const

virtual

Return the type of this projection.

Implements Projector.

Definition at line 33 of file equirectangularprojector.cpp.

bool EquirectangularProjector::unusablePoint ( const QPointF & p ) const

virtual

Check if the current point on screen is a valid point on the sky.

This is needed to avoid a crash of the program if the user clicks on a point outside the sky (the corners of the sky map at the lowest zoom level are the invalid points).

Parameters

p	the screen pixel position

Reimplemented from Projector.

Definition at line 102 of file equirectangularprojector.cpp.

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

kstars

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

kstars

kdeedu API Reference

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