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86 lines
2.8 KiB
Plaintext
86 lines
2.8 KiB
Plaintext
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/**Describes the result of a snapping operation*/
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struct QgsSnappingResult
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{
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%TypeHeaderCode
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#include <qgssnapper.h>
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%End
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/**The coordinates of the snapping result*/
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QgsPoint snappedVertex;
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/**The vertex index of snappedVertex
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or -1 if no such vertex number (e.g. snap to segment)*/
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int snappedVertexNr;
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/**The layer coordinates of the vertex before snappedVertex*/
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QgsPoint beforeVertex;
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/**The index of the vertex before snappedVertex
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or -1 if no such vertex*/
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int beforeVertexNr;
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/**The layer coordinates of the vertex after snappedVertex*/
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QgsPoint afterVertex;
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/**The index of the vertex after snappedVertex
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or -1 if no such vertex*/
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int afterVertexNr;
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/**Index of the snapped geometry*/
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qint64 snappedAtGeometry;
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/**Layer where the snap occured*/
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const QgsVectorLayer* layer;
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};
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/**A class that allows advanced snapping operations on a set of vector layers*/
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class QgsSnapper
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{
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%TypeHeaderCode
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#include <qgssnapper.h>
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%End
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public:
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/**Snap to vertex, to segment or both*/
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enum SnappingType
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{
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SnapToVertex,
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SnapToSegment,
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//snap to vertex and also to segment if no vertex is within the search tolerance
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SnapToVertexAndSegment
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};
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enum SnappingMode
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{
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/**Only one snapping result is retured*/
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SnapWithOneResult,
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/**Several snapping results which have the same position are returned.
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This is useful for topological editing*/
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SnapWithResultsForSamePosition,
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/**All results within the given layer tolerances are returned*/
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SnapWithResultsWithinTolerances
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};
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struct SnapLayer
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{
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/**The layer to which snapping is applied*/
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QgsVectorLayer* mLayer;
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/**The snapping tolerances for the layers, always in source coordinate systems of the layer*/
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double mTolerance;
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/**What snapping type to use (snap to segment or to vertex)*/
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QgsSnapper::SnappingType mSnapTo;
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/**What unit is used for tolerance*/
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QgsTolerance::UnitType mUnitType;
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};
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QgsSnapper( QgsMapRenderer* mapRender );
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~QgsSnapper();
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/**Does the snapping operation
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@param startPoint the start point for snapping (in pixel coordinates)
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@param snappingResult the list where the results are inserted (everything in map coordinate system)
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@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
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@return 0 in case of success*/
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int snapPoint( const QPoint& startPoint, QList<QgsSnappingResult>& snappingResult /Out/, const QList<QgsPoint>& excludePoints = QList<QgsPoint>() );
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//setters
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void setSnapLayers( const QList<QgsSnapper::SnapLayer>& snapLayers );
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void setSnapMode( QgsSnapper::SnappingMode snapMode );
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};
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