1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
class QgsCurveV2: public QgsAbstractGeometryV2
{
%TypeHeaderCode
#include <qgscurvev2.h>
%End
public:
QgsCurveV2();
virtual ~QgsCurveV2();
virtual bool operator==( const QgsCurveV2& other ) const = 0;
virtual bool operator!=( const QgsCurveV2& other ) const = 0;
virtual QgsCurveV2* clone() const = 0 /Factory/;
/** Returns the starting point of the curve.
* @see endPoint
*/
virtual QgsPointV2 startPoint() const = 0;
/** Returns the end point of the curve.
* @see startPoint
*/
virtual QgsPointV2 endPoint() const = 0;
/** Returns true if the curve is closed.
*/
virtual bool isClosed() const;
/** Returns true if the curve is a ring.
*/
virtual bool isRing() const;
/** Returns a new line string geometry corresponding to a segmentized approximation
* of the curve.
* @param tolerance segmentation tolerance
* @param toleranceType maximum segmentation angle or maximum difference between approximation and curve
*/
virtual QgsLineStringV2* curveToLine( double tolerance = M_PI_2 / 90, SegmentationToleranceType toleranceType = MaximumAngle ) const = 0 /Factory/;
/** Adds a curve to a painter path.
*/
virtual void addToPainterPath( QPainterPath& path ) const = 0;
/** Draws the curve as a polygon on the specified QPainter.
* @param p destination QPainter
*/
virtual void drawAsPolygon( QPainter& p ) const = 0;
/** Returns a list of points within the curve.
*/
virtual void points( QList<QgsPointV2>& pt ) const = 0;
/** Returns the number of points in the curve.
*/
virtual int numPoints() const = 0;
/** Sums up the area of the curve by iterating over the vertices (shoelace formula).
*/
virtual void sumUpArea( double& sum ) const = 0;
virtual QList< QList< QList< QgsPointV2 > > > coordinateSequence() const;
virtual bool nextVertex( QgsVertexId& id, QgsPointV2& vertex /Out/ ) const;
/** Returns the point and vertex id of a point within the curve.
* @param node node number, where the first node is 0
* @param point will be set to point at corresponding node in the curve
* @param type will be set to the vertex type of the node
* @returns true if node exists within the curve
*/
virtual bool pointAt( int node, QgsPointV2& point, QgsVertexId::VertexType& type ) const = 0;
/** Returns a reversed copy of the curve, where the direction of the curve has been flipped.
* @note added in QGIS 2.14
*/
virtual QgsCurveV2* reversed() const = 0 /Factory/;
virtual QgsAbstractGeometryV2* boundary() const /Factory/;
/** Returns a geometry without curves. Caller takes ownership
* @param tolerance segmentation tolerance
* @param toleranceType maximum segmentation angle or maximum difference between approximation and curve*/
virtual QgsCurveV2* segmentize( double tolerance = M_PI_2 / 90, SegmentationToleranceType toleranceType = MaximumAngle ) const /Factory/;
virtual int vertexCount( int part = 0, int ring = 0 ) const;
virtual int ringCount( int part = 0 ) const;
virtual int partCount() const;
virtual QgsPointV2 vertexAt( QgsVertexId id ) const;
virtual QgsRectangle boundingBox() const;
/** Drops any Z dimensions which exist in the geometry.
* @returns true if Z values were present and have been removed
* @see dropMValue()
* @note added in QGIS 2.14
*/
virtual bool dropZValue() = 0;
/** Drops any M values which exist in the geometry.
* @returns true if M values were present and have been removed
* @see dropZValue()
* @note added in QGIS 2.14
*/
virtual bool dropMValue() = 0;
protected:
virtual void clearCache() const;
};
|
