QLine Class
The QLine class provides a two-dimensional vector using integer precision. More...
Header: | #include <QLine> |
qmake: | QT += core |
Public Functions
QLine() | |
QLine(const QPoint &pt1, const QPoint &pt2) | |
QLine(int x1, int y1, int x2, int y2) | |
QPoint | p1() const |
QPoint | p2() const |
int | x1() const |
int | x2() const |
int | y1() const |
int | y2() const |
QPoint | center() const |
int | dx() const |
int | dy() const |
bool | isNull() const |
void | setP1(const QPoint &p1) |
void | setP2(const QPoint &p2) |
void | setLine(int x1, int y1, int x2, int y2) |
void | setPoints(const QPoint &p1, const QPoint &p2) |
void | translate(const QPoint &p) |
void | translate(int dx, int dy) |
QLine | translated(const QPoint &p) const |
QLine | translated(int dx, int dy) const |
bool | operator!=(const QLine &d) const |
bool | operator==(const QLine &d) const |
Related Non-Members
QDataStream & | operator<<(QDataStream &stream, const QLine &line) |
QDataStream & | operator>>(QDataStream &stream, QLine &line) |
Detailed Description
The QLine class provides a two-dimensional vector using integer precision.
A QLine describes a finite length line (or a line segment) on a two-dimensional surface. The start and end points of the line are specified using integer point accuracy for coordinates. Use the QLineF constructor to retrieve a floating point copy.
![]() | ![]() |
The positions of the line's start and end points can be retrieved using the p1(), x1(), y1(), p2(), x2(), and y2() functions. The dx() and dy() functions return the horizontal and vertical components of the line. Use isNull() to determine whether the QLine represents a valid line or a null line.
Finally, the line can be translated a given offset using the translate() function.
See also QLineF, QPolygon, and QRect.
Member Type Documentation
Property Documentation
Member Function Documentation
QLine::QLine()
Default constructs an instance of QLine.
QLine::QLine(const QPoint &pt1, const QPoint &pt2)
Default constructs an instance of QLine.
QLine::QLine(int x1, int y1, int x2, int y2)
Default constructs an instance of QLine.
QPoint QLine::p1() const
See also setP1().
QPoint QLine::p2() const
See also setP2().
int QLine::x1() const
int QLine::x2() const
int QLine::y1() const
int QLine::y2() const
QPoint QLine::center() const
int QLine::dx() const
int QLine::dy() const
bool QLine::isNull() const
void QLine::setP1(const QPoint &p1)
See also p1().
void QLine::setP2(const QPoint &p2)
See also p2().
void QLine::setLine(int x1, int y1, int x2, int y2)
void QLine::setPoints(const QPoint &p1, const QPoint &p2)
void QLine::translate(const QPoint &p)
void QLine::translate(int dx, int dy)
QLine QLine::translated(const QPoint &p) const
QLine QLine::translated(int dx, int dy) const
bool QLine::operator!=(const QLine &d) const
bool QLine::operator==(const QLine &d) const
Member Variable Documentation
Related Non-Members
QDataStream &operator<<(QDataStream &stream, const QLine &line)
Writes the given line to the given stream and returns a reference to the stream.
See also Serializing Qt Data Types.
QDataStream &operator>>(QDataStream &stream, QLine &line)
Reads a line from the given stream into the given line and returns a reference to the stream.
See also Serializing Qt Data Types.