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/**Describes the result of a snapping operation*/
struct QgsSnappingResult
{
%TypeHeaderCode
#include <qgssnapper.h>
%End
/**The coordinates of the snapping result*/
QgsPoint snappedVertex;
/**The vertex index of snappedVertex
or -1 if no such vertex number (e.g. snap to segment)*/
int snappedVertexNr;
/**The layer coordinates of the vertex before snappedVertex*/
QgsPoint beforeVertex;
/**The index of the vertex before snappedVertex
or -1 if no such vertex*/
int beforeVertexNr;
/**The layer coordinates of the vertex after snappedVertex*/
QgsPoint afterVertex;
/**The index of the vertex after snappedVertex
or -1 if no such vertex*/
int afterVertexNr;
/**Index of the snapped geometry*/
qint64 snappedAtGeometry;
/**Layer where the snap occured*/
const QgsVectorLayer* layer;
};
/**A class that allows advanced snapping operations on a set of vector layers*/
class QgsSnapper
{
%TypeHeaderCode
#include <qgssnapper.h>
%End
public:
/**Snap to vertex, to segment or both*/
enum SnappingType
{
SnapToVertex,
SnapToSegment,
//snap to vertex and also to segment if no vertex is within the search tolerance
SnapToVertexAndSegment
};
enum SnappingMode
{
/**Only one snapping result is returned*/
SnapWithOneResult,
/**Several snapping results which have the same position are returned.
This is useful for topological editing*/
SnapWithResultsForSamePosition,
/**All results within the given layer tolerances are returned*/
SnapWithResultsWithinTolerances
};
struct SnapLayer
{
/**The layer to which snapping is applied*/
QgsVectorLayer* mLayer;
/**The snapping tolerances for the layers, always in source coordinate systems of the layer*/
double mTolerance;
/**What snapping type to use (snap to segment or to vertex)*/
QgsSnapper::SnappingType mSnapTo;
/**What unit is used for tolerance*/
QgsTolerance::UnitType mUnitType;
};
//!@ deprecated since 2.4 - use constructor with QgsMapSettings
QgsSnapper( QgsMapRenderer* mapRender ) /Deprecated/;
explicit QgsSnapper( const QgsMapSettings& mapSettings );
~QgsSnapper();
/**Does the snapping operation
@param startPoint the start point for snapping (in pixel coordinates)
@param snappingResult the list where the results are inserted (everything in map coordinate system)
@param excludePoints a list with (map coordinate) points that should be excluded in the snapping result. Useful e.g. for vertex moves where a vertex should not be snapped to its original position
@return 0 in case of success
*/
int snapPoint( const QPoint& startPoint, QList<QgsSnappingResult>& snappingResult /Out/, const QList<QgsPoint>& excludePoints = QList<QgsPoint>() );
//setters
void setSnapLayers( const QList<QgsSnapper::SnapLayer>& snapLayers );
void setSnapMode( QgsSnapper::SnappingMode snapMode );
};
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