QgsMapToPixelSimplifier Class Reference

Implementation of GeometrySimplifier using the "MapToPixel" algorithm. More...

#include <qgsmaptopixelgeometrysimplifier.h>

Inheritance diagram for QgsMapToPixelSimplifier:

Public Types
enum	SimplifyFlag { NoFlags = 0, SimplifyGeometry = 1, SimplifyEnvelope = 2 }
	Applicable simplification flags. More...

Public Member Functions
	QgsMapToPixelSimplifier (int simplifyFlags, double tolerance)
virtual	~QgsMapToPixelSimplifier ()
int	simplifyFlags () const
void	setSimplifyFlags (int simplifyFlags)
virtual QgsGeometry *	simplify (QgsGeometry *geometry) const
	Returns a simplified version the specified geometry.
virtual bool	simplifyGeometry (QgsGeometry *geometry) const
	Simplifies the specified geometry.
bool	isGeneralizableByMapBoundingBox (const QgsRectangle &envelope) const
	Returns whether the envelope can be replaced by its BBOX when is applied the specified map2pixel context.
Public Member Functions inherited from QgsAbstractGeometrySimplifier
virtual	~QgsAbstractGeometrySimplifier ()

Static Public Member Functions
static bool	isGeneralizableByMapBoundingBox (const QgsRectangle &envelope, double map2pixelTol)
	Returns whether the envelope can be replaced by its BBOX when is applied the specified map2pixel context.
static bool	simplifyGeometry (QgsGeometry *geometry, int simplifyFlags, double tolerance)
	Simplifies the geometry when is applied the specified map2pixel context.
Static Public Member Functions inherited from QgsAbstractGeometrySimplifier
static bool	isGeneralizableByDeviceBoundingBox (const QgsRectangle &envelope, float mapToPixelTol=1.0f)
	Returns whether the device-envelope can be replaced by its BBOX when is applied the specified tolerance.
static bool	isGeneralizableByDeviceBoundingBox (const QVector< QPointF > &points, float mapToPixelTol=1.0f)
	Returns whether the device-geometry can be replaced by its BBOX when is applied the specified tolerance.

Static Protected Member Functions
static float	calculateLengthSquared2D (double x1, double y1, double x2, double y2)
	Returns the squared 2D-distance of the vector defined by the two points specified.

Protected Attributes
int	mSimplifyFlags
	Current simplification flags.
double	mTolerance
	Distance tolerance for the simplification.

Detailed Description

Implementation of GeometrySimplifier using the "MapToPixel" algorithm.

Simplifies a geometry removing points within of the maximum distance difference that defines the MapToPixel info of a RenderContext request. This class enables simplify the geometries to be rendered in a MapCanvas target to speed up the vector drawing.

Member Enumeration Documentation

enum QgsMapToPixelSimplifier::SimplifyFlag

Applicable simplification flags.

Enumerator:

NoFlags	No simplification can be applied.
SimplifyGeometry	The geometries can be simplified using the current map2pixel context state.
SimplifyEnvelope	The geometries can be fully simplified by its BoundingBox.

Constructor & Destructor Documentation

QgsMapToPixelSimplifier::QgsMapToPixelSimplifier	(	int	simplifyFlags,
		double	tolerance
	)

QgsMapToPixelSimplifier::~QgsMapToPixelSimplifier ( )

virtual

Member Function Documentation

float QgsMapToPixelSimplifier::calculateLengthSquared2D ( double  x1, double  y1, double  x2, double  y2  )

staticprotected

Returns the squared 2D-distance of the vector defined by the two points specified.

bool QgsMapToPixelSimplifier::isGeneralizableByMapBoundingBox ( const QgsRectangle &  envelope, double  map2pixelTol  )

static

Returns whether the envelope can be replaced by its BBOX when is applied the specified map2pixel context.

bool QgsMapToPixelSimplifier::isGeneralizableByMapBoundingBox ( const QgsRectangle &  envelope ) const

inline

Returns whether the envelope can be replaced by its BBOX when is applied the specified map2pixel context.

void QgsMapToPixelSimplifier::setSimplifyFlags ( int  simplifyFlags )

inline

QgsGeometry * QgsMapToPixelSimplifier::simplify ( QgsGeometry *  geometry ) const

virtual

Returns a simplified version the specified geometry.

Returns a simplified version the specified geometry (Removing duplicated points) when is applied the specified map2pixel context.

Implements QgsAbstractGeometrySimplifier.

int QgsMapToPixelSimplifier::simplifyFlags ( ) const

inline

bool QgsMapToPixelSimplifier::simplifyGeometry ( QgsGeometry *  geometry ) const

virtual

Simplifies the specified geometry.

Simplifies the geometry (Removing duplicated points) when is applied the specified map2pixel context.

Implements QgsAbstractGeometrySimplifier.

bool QgsMapToPixelSimplifier::simplifyGeometry ( QgsGeometry *  geometry, int  simplifyFlags, double  tolerance  )

static

Simplifies the geometry when is applied the specified map2pixel context.

Simplifies the geometry (Removing duplicated points) when is applied the specified map2pixel context.

Member Data Documentation

int QgsMapToPixelSimplifier::mSimplifyFlags

protected

Current simplification flags.

double QgsMapToPixelSimplifier::mTolerance

protected

Distance tolerance for the simplification.

---

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

• /tmp/buildd/qgis-2.6.0+wheezy1/src/core/qgsmaptopixelgeometrysimplifier.h
• /tmp/buildd/qgis-2.6.0+wheezy1/src/core/qgsmaptopixelgeometrysimplifier.cpp