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129 lines
4.4 KiB
Plaintext
129 lines
4.4 KiB
Plaintext
class QgsCurve: public QgsAbstractGeometry
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{
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%TypeHeaderCode
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#include <qgscurve.h>
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%End
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public:
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QgsCurve();
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virtual ~QgsCurve();
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virtual bool operator==( const QgsCurve& other ) const = 0;
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virtual bool operator!=( const QgsCurve& other ) const = 0;
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virtual QgsCurve* clone() const = 0;
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/** Returns the starting point of the curve.
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* @see endPoint
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*/
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virtual QgsPointV2 startPoint() const = 0;
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/** Returns the end point of the curve.
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* @see startPoint
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*/
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virtual QgsPointV2 endPoint() const = 0;
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/** Returns true if the curve is closed.
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*/
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virtual bool isClosed() const;
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/** Returns true if the curve is a ring.
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*/
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virtual bool isRing() const;
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/** Returns a new line string geometry corresponding to a segmentized approximation
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* of the curve.
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* @param tolerance segmentation tolerance
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* @param toleranceType maximum segmentation angle or maximum difference between approximation and curve
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*/
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virtual QgsLineString* curveToLine( double tolerance = M_PI_2 / 90, SegmentationToleranceType toleranceType = MaximumAngle ) const = 0;
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/** Adds a curve to a painter path.
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*/
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virtual void addToPainterPath( QPainterPath& path ) const = 0;
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/** Draws the curve as a polygon on the specified QPainter.
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* @param p destination QPainter
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*/
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virtual void drawAsPolygon( QPainter& p ) const = 0;
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/** Returns a list of points within the curve.
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*/
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virtual void points( QList<QgsPointV2>& pt ) const = 0;
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/** Returns the number of points in the curve.
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*/
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virtual int numPoints() const = 0;
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/** Calculates the area of the curve. Derived classes should override this
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* to return the correct area of the curve.
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*/
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virtual void sumUpArea( double& sum ) const = 0;
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virtual QList< QList< QList< QgsPointV2 > > > coordinateSequence() const;
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virtual bool nextVertex( QgsVertexId& id, QgsPointV2& vertex ) const;
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/** Returns the point and vertex id of a point within the curve.
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* @param node node number, where the first node is 0
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* @param point will be set to point at corresponding node in the curve
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* @param type will be set to the vertex type of the node
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* @returns true if node exists within the curve
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*/
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virtual bool pointAt( int node, QgsPointV2& point, QgsVertexId::VertexType& type ) const = 0;
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/** Returns a reversed copy of the curve, where the direction of the curve has been flipped.
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* @note added in QGIS 2.14
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*/
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virtual QgsCurve* reversed() const = 0 /Factory/;
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virtual QgsAbstractGeometry* boundary() const /Factory/;
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/** Returns a geometry without curves. Caller takes ownership
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* @param tolerance segmentation tolerance
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* @param toleranceType maximum segmentation angle or maximum difference between approximation and curve*/
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virtual QgsCurve* segmentize( double tolerance = M_PI_2 / 90, SegmentationToleranceType toleranceType = MaximumAngle ) const /Factory/;
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virtual int vertexCount( int part = 0, int ring = 0 ) const;
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virtual int ringCount( int part = 0 ) const;
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virtual int partCount() const;
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virtual QgsPointV2 vertexAt( QgsVertexId id ) const;
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virtual QgsRectangle boundingBox() const;
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/** Drops any Z dimensions which exist in the geometry.
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* @returns true if Z values were present and have been removed
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* @see dropMValue()
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* @note added in QGIS 2.14
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*/
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virtual bool dropZValue() = 0;
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/** Drops any M values which exist in the geometry.
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* @returns true if M values were present and have been removed
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* @see dropZValue()
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* @note added in QGIS 2.14
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*/
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virtual bool dropMValue() = 0;
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/** Returns the x-coordinate of the specified node in the line string.
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* @param index index of node, where the first node in the line is 0
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* @returns x-coordinate of node, or 0.0 if index is out of bounds
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* @see setXAt()
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*/
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virtual double xAt( int index ) const = 0;
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/** Returns the y-coordinate of the specified node in the line string.
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* @param index index of node, where the first node in the line is 0
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* @returns y-coordinate of node, or 0.0 if index is out of bounds
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* @see setYAt()
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*/
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virtual double yAt( int index ) const = 0;
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/** Returns a QPolygonF representing the line string.
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*/
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QPolygonF asQPolygonF() const;
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protected:
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virtual void clearCache() const;
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};
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