QgsTolerance Class Reference

This is the class is providing tolerance value in map unit values. More...

#include <qgstolerance.h>

Public Types
enum	UnitType { MapUnits, Pixels }
	Type of unit of tolerance value from settings. More...

Static Public Member Functions
static double	vertexSearchRadius (QgsMapLayer *layer, QgsMapRenderer *renderer)
	Static function to get vertex tolerance value for a layer.
static double	defaultTolerance (QgsMapLayer *layer, QgsMapRenderer *renderer)
	Static function to get default tolerance value for a layer.
static double	toleranceInMapUnits (double tolerance, QgsMapLayer *layer, QgsMapRenderer *renderer, UnitType units=MapUnits)
	Static function to translate tolerance value into current map unit value.

Static Private Member Functions
static double	computeMapUnitPerPixel (QgsMapLayer *layer, QgsMapRenderer *renderer)
static QgsPoint	toLayerCoordinates (QgsMapLayer *layer, QgsMapRenderer *renderer, const QPoint &point)

Detailed Description

This is the class is providing tolerance value in map unit values.

Note

This class has been added in version 1.1.

Definition at line 28 of file qgstolerance.h.

Member Enumeration Documentation

enum QgsTolerance::UnitType

Type of unit of tolerance value from settings.

Enumerator:

MapUnits	Map unit value.
Pixels	Pixels unit of tolerance.

Definition at line 33 of file qgstolerance.h.

Member Function Documentation

double QgsTolerance::computeMapUnitPerPixel ( QgsMapLayer *  layer, QgsMapRenderer *  renderer  )

staticprivate

Definition at line 50 of file qgstolerance.cpp.

References QgsMapRenderer::hasCrsTransformEnabled(), QgsMapRenderer::mapUnitsPerPixel(), QgsPoint::sqrDist(), and toLayerCoordinates().

Referenced by toleranceInMapUnits().

double QgsTolerance::defaultTolerance ( QgsMapLayer *  layer, QgsMapRenderer *  renderer  )

static

Static function to get default tolerance value for a layer.

The value is read from settings and transformed if necessary.

Returns

value of default tolerance in map units

Definition at line 41 of file qgstolerance.cpp.

References toleranceInMapUnits().

Referenced by QgsMapCanvasSnapper::snapToBackgroundLayers().

QgsPoint QgsTolerance::toLayerCoordinates ( QgsMapLayer *  layer, QgsMapRenderer *  renderer, const QPoint &  point  )

staticprivate

Definition at line 78 of file qgstolerance.cpp.

References QgsMapRenderer::coordinateTransform(), QgsMapRenderer::mapToLayerCoordinates(), and QgsMapToPixel::toMapCoordinates().

Referenced by computeMapUnitPerPixel().

double QgsTolerance::toleranceInMapUnits ( double  tolerance, QgsMapLayer *  layer, QgsMapRenderer *  renderer, UnitType  units = MapUnits  )

static

Static function to translate tolerance value into current map unit value.

Parameters

tolerance	tolerance value to be translated
layer	reference layer
renderer	renderer
units	type of units to be translated

Returns

value of tolerance in map units

Definition at line 21 of file qgstolerance.cpp.

References computeMapUnitPerPixel(), and MapUnits.

Referenced by defaultTolerance(), QgsSnapper::snapPoint(), and vertexSearchRadius().

double QgsTolerance::vertexSearchRadius ( QgsMapLayer *  layer, QgsMapRenderer *  renderer  )

static

Static function to get vertex tolerance value for a layer.

The value is read from settings and transformed if necessary.

Returns

value of vertex tolerance in map units

Definition at line 32 of file qgstolerance.cpp.

References Pixels, and toleranceInMapUnits().

Referenced by QgsMapCanvasSnapper::snapToCurrentLayer().

---

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

• /tmp/buildd/qgis-2.0.1/src/core/qgstolerance.h
• /tmp/buildd/qgis-2.0.1/src/core/qgstolerance.cpp