QGIS API Documentation  3.13.0-Master (7f54853aae)
Public Member Functions | List of all members
QgsLineSegment2D Class Reference

Represents a single 2D line segment, consisting of a 2D start and end vertex only. More...

#include <qgslinesegment.h>

Public Member Functions

 QgsLineSegment2D (const QgsPointXY &start, const QgsPointXY &end)
 Constructor for a QgsLineSegment2D from the specified start point to the end point. More...
 
 QgsLineSegment2D (double x1, double y1, double x2, double y2)
 Constructor for a QgsLineSegment2D from the point (x1, y2) to (x2, y2). More...
 
QgsPointXY end () const
 Returns the segment's end point. More...
 
double endX () const
 Returns the segment's end x-coordinate. More...
 
double endY () const
 Returns the segment's end y-coordinate. More...
 
double length () const
 Returns the length of the segment. More...
 
double lengthSquared () const
 Returns the squared length of the segment. More...
 
bool operator!= (const QgsLineSegment2D &other) const
 Inequality operator. More...
 
bool operator== (const QgsLineSegment2D &other) const
 Equality operator. More...
 
int pointLeftOfLine (const QgsPointXY &point) const
 Tests if a point is to the left of the line segment. More...
 
void reverse ()
 Reverses the line segment, so that the start and end points are flipped. More...
 
void setEnd (const QgsPointXY &end)
 Sets the segment's end point. More...
 
void setEndX (double x)
 Sets the segment's end x coordinate. More...
 
void setEndY (double y)
 Sets the segment's end y coordinate. More...
 
void setStart (const QgsPointXY &start)
 Sets the segment's start point. More...
 
void setStartX (double x)
 Sets the segment's start x coordinate. More...
 
void setStartY (double y)
 Sets the segment's start y coordinate. More...
 
QgsPointXY start () const
 Returns the segment's start point. More...
 
double startX () const
 Returns the segment's start x-coordinate. More...
 
double startY () const
 Returns the segment's start y-coordinate. More...
 

Detailed Description

Represents a single 2D line segment, consisting of a 2D start and end vertex only.

Since
QGIS 3.2

Definition at line 31 of file qgslinesegment.h.

Constructor & Destructor Documentation

◆ QgsLineSegment2D() [1/2]

QgsLineSegment2D::QgsLineSegment2D ( const QgsPointXY start,
const QgsPointXY end 
)
inline

Constructor for a QgsLineSegment2D from the specified start point to the end point.

Definition at line 40 of file qgslinesegment.h.

◆ QgsLineSegment2D() [2/2]

QgsLineSegment2D::QgsLineSegment2D ( double  x1,
double  y1,
double  x2,
double  y2 
)
inline

Constructor for a QgsLineSegment2D from the point (x1, y2) to (x2, y2).

Definition at line 49 of file qgslinesegment.h.

Member Function Documentation

◆ end()

QgsPointXY QgsLineSegment2D::end ( ) const
inline

Returns the segment's end point.

See also
start()
endX()
endY()

Definition at line 129 of file qgslinesegment.h.

◆ endX()

double QgsLineSegment2D::endX ( ) const
inline

Returns the segment's end x-coordinate.

See also
end()
endY()

Definition at line 97 of file qgslinesegment.h.

◆ endY()

double QgsLineSegment2D::endY ( ) const
inline

Returns the segment's end y-coordinate.

See also
end()
endX()

Definition at line 107 of file qgslinesegment.h.

◆ length()

double QgsLineSegment2D::length ( ) const
inline

Returns the length of the segment.

See also
lengthSquared()

Definition at line 58 of file qgslinesegment.h.

◆ lengthSquared()

double QgsLineSegment2D::lengthSquared ( ) const
inline

Returns the squared length of the segment.

See also
length()

Definition at line 67 of file qgslinesegment.h.

◆ operator!=()

bool QgsLineSegment2D::operator!= ( const QgsLineSegment2D other) const
inline

Inequality operator.

Definition at line 228 of file qgslinesegment.h.

◆ operator==()

bool QgsLineSegment2D::operator== ( const QgsLineSegment2D other) const
inline

Equality operator.

Definition at line 222 of file qgslinesegment.h.

◆ pointLeftOfLine()

int QgsLineSegment2D::pointLeftOfLine ( const QgsPointXY point) const

Tests if a point is to the left of the line segment.

Returns -1 if the point falls to the left of the line, or +1 if the point is to the right.

If the return value is 0, then the test was unsuccessful (e.g. due to testing a point exactly on the line, or exactly in line with the segment) and the result is undefined.

See also
QgsGeometryUtils::leftOfLine()

Definition at line 21 of file qgslinesegment.cpp.

◆ reverse()

void QgsLineSegment2D::reverse ( )
inline

Reverses the line segment, so that the start and end points are flipped.

Definition at line 216 of file qgslinesegment.h.

◆ setEnd()

void QgsLineSegment2D::setEnd ( const QgsPointXY end)
inline

Sets the segment's end point.

See also
setEndX()
setEndY()
setStart()

Definition at line 195 of file qgslinesegment.h.

◆ setEndX()

void QgsLineSegment2D::setEndX ( double  x)
inline

Sets the segment's end x coordinate.

See also
setStartX()
setEnd()
setEndY()

Definition at line 162 of file qgslinesegment.h.

◆ setEndY()

void QgsLineSegment2D::setEndY ( double  y)
inline

Sets the segment's end y coordinate.

See also
setStartY()
setEnd()
setEndX()

Definition at line 173 of file qgslinesegment.h.

◆ setStart()

void QgsLineSegment2D::setStart ( const QgsPointXY start)
inline

Sets the segment's start point.

See also
setStartX()
setStartY()
setEnd()

Definition at line 184 of file qgslinesegment.h.

◆ setStartX()

void QgsLineSegment2D::setStartX ( double  x)
inline

Sets the segment's start x coordinate.

See also
setEndX()
setStart()
setStartY()

Definition at line 140 of file qgslinesegment.h.

◆ setStartY()

void QgsLineSegment2D::setStartY ( double  y)
inline

Sets the segment's start y coordinate.

See also
setEndY()
setStart()
setStartX()

Definition at line 151 of file qgslinesegment.h.

◆ start()

QgsPointXY QgsLineSegment2D::start ( ) const
inline

Returns the segment's start point.

See also
end()
startX()
startY()

Definition at line 118 of file qgslinesegment.h.

◆ startX()

double QgsLineSegment2D::startX ( ) const
inline

Returns the segment's start x-coordinate.

See also
start()
startY()

Definition at line 77 of file qgslinesegment.h.

◆ startY()

double QgsLineSegment2D::startY ( ) const
inline

Returns the segment's start y-coordinate.

See also
start()
startX()

Definition at line 87 of file qgslinesegment.h.


The documentation for this class was generated from the following files: