osmscout::TransBuffer Class Reference

Temporary stateful buffer for holding results of transformation of polygon from geo coords to display coords. More...

#include <Transformation.h>

Public Member Functions
void	CalcSize ()
	After direct writing access to the points array to have to call this method to correct internal start, end and length variables.
bool	GetBoundingBox (double &xmin, double &ymin, double &xmax, double &ymax) const
	Return the bounding box of the to be drawn display coordinates.
size_t	GetEnd () const
	Return the last to be drawn point.
size_t	GetLength () const
	Return the number of to be drawn points.
size_t	GetStart () const
	Return the inex of the first to be drawn point.
bool	IsEmpty () const
	Return true, if the TransBuffer holds data (length==0)
void	Reset ()
	Reset length, start and end.
	TransBuffer ()=default
template<typename C >
void	TransformGeoToPixel (const Projection &projection, const C &nodes)
	Transform the given source array of GeoCoords to DisplayPoints in the buffer.
	~TransBuffer ()

Public Attributes
TransPoint *	points =nullptr

Detailed Description

Temporary stateful buffer for holding results of transformation of polygon from geo coords to display coords.

Constructor & Destructor Documentation

TransBuffer()

osmscout::TransBuffer::TransBuffer ( )

default

~TransBuffer()

osmscout::TransBuffer::~TransBuffer

(

)

References points.

Member Function Documentation

CalcSize()

void osmscout::TransBuffer::CalcSize

(

)

After direct writing access to the points array to have to call this method to correct internal start, end and length variables.

References points.

Referenced by osmscout::OptimizeArea(), and osmscout::OptimizeWay().

GetBoundingBox()

bool osmscout::TransBuffer::GetBoundingBox	(	double &	xmin,
		double &	ymin,
		double &	xmax,
		double &	ymax
	)		const

Return the bounding box of the to be drawn display coordinates.

Parameters

xmin
ymin
xmax
ymax

Returns

References GetEnd(), GetStart(), IsEmpty(), points, osmscout::TransPoint::x, and osmscout::TransPoint::y.

GetEnd()

size_t osmscout::TransBuffer::GetEnd ( ) const

inline

Return the last to be drawn point.

Returns

Referenced by osmscout::CopyPolygonToCoordBuffer(), and GetBoundingBox().

GetLength()

size_t osmscout::TransBuffer::GetLength ( ) const

inline

Return the number of to be drawn points.

Returns

Referenced by osmscout::DropEqualPoints(), osmscout::DropRedundantPointsDouglasPeuckerArea(), osmscout::DropRedundantPointsDouglasPeuckerWay(), osmscout::DropRedundantPointsFast(), osmscout::DropSimilarPoints(), and osmscout::EnsureSimple().

GetStart()

size_t osmscout::TransBuffer::GetStart ( ) const

inline

Return the inex of the first to be drawn point.

Returns

Referenced by osmscout::CopyPolygonToCoordBuffer(), and GetBoundingBox().

IsEmpty()

bool osmscout::TransBuffer::IsEmpty ( ) const

inline

Return true, if the TransBuffer holds data (length==0)

Returns

Referenced by osmscout::CopyPolygonToCoordBuffer(), GetBoundingBox(), osmscout::TransformArea(), osmscout::TransformBoundingBox(), and osmscout::TransformWay().

Reset()

void osmscout::TransBuffer::Reset

(

)

Reset length, start and end.

Referenced by osmscout::TransformArea(), and osmscout::TransformWay().

TransformGeoToPixel()

template<typename C >

void osmscout::TransBuffer::TransformGeoToPixel ( const Projection &  projection, const C &  nodes  )

inline

Transform the given source array of GeoCoords to DisplayPoints in the buffer.

Template Parameters

C	a container object like list, vector or array

Parameters

projection	The projection to use for transformation from geo coordinates to display coordinates
nodes	The container holding the geo coordinates

References osmscout::TransPoint::draw, and osmscout::Projection::BatchTransformer::GeoToPixel().

Referenced by osmscout::TransformArea(), and osmscout::TransformWay().

Member Data Documentation

points

TransPoint* osmscout::TransBuffer::points =nullptr

Referenced by CalcSize(), osmscout::CopyPolygonToCoordBuffer(), osmscout::DropEqualPoints(), osmscout::DropRedundantPointsDouglasPeuckerArea(), osmscout::DropRedundantPointsDouglasPeuckerWay(), osmscout::DropRedundantPointsFast(), osmscout::DropSimilarPoints(), osmscout::EnsureSimple(), GetBoundingBox(), and ~TransBuffer().

---

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

• Transformation.h
• Transformation.cpp