31 const QgsPointXY ptMapCenterRightMU( ptMapCenterMU.
x() + distMU, ptMapCenterMU.
y() );
34 const double distLU = std::sqrt( ptMapCenterLU.
sqrDist( ptMapCenterRightLU ) );
35 const double ratio = distMU / distLU;
44 else if ( units ==
Pixels )
49 return tolerance *
_ratioMU2LU( mapSettings, layer );
61 else if ( units ==
Pixels )
63 const double layerUnitsPerPixel = computeMapUnitPerPixel( layer, mapSettings );
64 return tolerance * layerUnitsPerPixel;
69 return tolerance /
_ratioMU2LU( mapSettings, layer );
102 const QgsPointXY p1 = toLayerCoordinates( layer, mapSettings, QPoint( 0, 1 ) );
103 const QgsPointXY p2 = toLayerCoordinates( layer, mapSettings, QPoint( 0, 2 ) );
104 const QgsPointXY p3 = toLayerCoordinates( layer, mapSettings, QPoint( 1, 0 ) );
105 const QgsPointXY p4 = toLayerCoordinates( layer, mapSettings, QPoint( 2, 0 ) );
106 const double x = p1.
sqrDist( p2 );
107 const double y = p3.
sqrDist( p4 );
110 return std::sqrt( x );
114 return std::sqrt( y );
Base class for all map layer types.
The QgsMapSettings class contains configuration for rendering of the map.
const QgsMapToPixel & mapToPixel() const
double mapUnitsPerPixel() const
Returns the distance in geographical coordinates that equals to one pixel in the map.
QgsRectangle visibleExtent() const
Returns the actual extent derived from requested extent that takes output image size into account.
QgsPointXY mapToLayerCoordinates(const QgsMapLayer *layer, QgsPointXY point) const
transform point coordinates from output CRS to layer's CRS
QgsPointXY toMapCoordinates(int x, int y) const
Transforms device coordinates to map (world) coordinates.
A class to represent a 2D point.
double sqrDist(double x, double y) const SIP_HOLDGIL
Returns the squared distance between this point a specified x, y coordinate.
QgsPointXY center() const SIP_HOLDGIL
Returns the center point of the rectangle.
T value(const QString &dynamicKeyPart=QString()) const
Returns settings value.
static const QgsSettingsEntryDouble settingsDigitizingDefaultSnappingTolerance
Settings entry digitizing default snapping tolerance.
static const QgsSettingsEntryEnumFlag< QgsTolerance::UnitType > settingsDigitizingSearchRadiusVertexEditUnit
Settings entry digitizing search radius vertex edit unit.
static const QgsSettingsEntryEnumFlag< QgsTolerance::UnitType > settingsDigitizingDefaultSnappingToleranceUnit
Settings entry digitizing default snapping tolerance unit.
static const QgsSettingsEntryDouble settingsDigitizingSearchRadiusVertexEdit
Settings entry digitizing search radius vertex edit.
static double toleranceInMapUnits(double tolerance, QgsMapLayer *layer, const QgsMapSettings &mapSettings, UnitType units=LayerUnits)
Static function to translate tolerance value into layer units.
static double vertexSearchRadius(const QgsMapSettings &mapSettings)
Static function to get vertex tolerance value.
static double defaultTolerance(QgsMapLayer *layer, const QgsMapSettings &mapSettings)
Static function to get default tolerance value for a layer.
static double toleranceInProjectUnits(double tolerance, QgsMapLayer *layer, const QgsMapSettings &mapSettings, QgsTolerance::UnitType units)
Static function to translate tolerance value into map units.
UnitType
Type of unit of tolerance value from settings.
@ ProjectUnits
Map (project) units. Added in 2.8.
@ Pixels
Pixels unit of tolerance.
@ LayerUnits
Layer unit value.
double _ratioMU2LU(const QgsMapSettings &mapSettings, QgsMapLayer *layer)