Stellarium  0.20.4
Public Member Functions | Protected Member Functions
StelProjectorEqualArea Class Reference

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 Vec4igetViewport () 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 SphericalCapgetBoundingCap () 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< ModelViewTranformModelViewTranformP
 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.