CopperSpice API
1.7.2

The QLineF class provides a twodimensional vector using floating point precision. More...
Public Types  
enum  IntersectType 
Public Methods  
QLineF () = default  
QLineF (const QLine &line)  
QLineF (const QPointF &point1, const QPointF &point2)  
QLineF (qreal x1, qreal y1, qreal x2, qreal y2)  
qreal  angle () const 
qreal  angle (const QLineF &lineF) const 
qreal  angleTo (const QLineF &lineF) const 
qreal  dx () const 
qreal  dy () const 
IntersectType  intersect (const QLineF &lineF, QPointF *intersectionPoint) const 
bool  isNull () const 
qreal  length () const 
QLineF  normalVector () const 
bool  operator!= (const QLineF &lineF) const 
bool  operator== (const QLineF &lineF) const 
QPointF  p1 () const 
QPointF  p2 () const 
QPointF  pointAt (qreal pos) const 
void  setAngle (qreal angle) 
void  setLength (qreal len) 
void  setLine (qreal x1, qreal y1, qreal x2, qreal y2) 
void  setP1 (const QPointF &point) 
void  setP2 (const QPointF &point) 
void  setPoints (const QPointF &point1, const QPointF &point2) 
QLine  toLine () const 
void  translate (const QPointF &point) 
void  translate (qreal dx, qreal dy) 
QLineF  translated (const QPointF &offset) const 
QLineF  translated (qreal dx, qreal dy) const 
QLineF  unitVector () const 
qreal  x1 () const 
qreal  x2 () const 
qreal  y1 () const 
qreal  y2 () const 
Static Public Methods  
static QLineF  fromPolar (qreal length, qreal angle) 
Related Functions  
These are not member functions  
QDataStream &  operator<< (QDataStream &stream, const QLineF &lineF) 
QDataStream &  operator>> (QDataStream &stream, QLineF &lineF) 
The QLineF class provides a twodimensional vector using floating point precision.
A QLineF describes a finite length line (or line segment) on a twodimensional surface. QLineF defines the start and end points of the line using floating point accuracy for coordinates. Use the toLine() function to retrieve an integer based copy of this line.
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, respectively.
The line's length can be retrieved using the length() function, and altered using the setLength() function. Similarly, angle() and setAngle() are respectively used for retrieving and altering the angle of the line. Use the isNull() function to determine whether the QLineF represents a valid line or a null line.
The intersect() function determines the IntersectType for this line and a given line, while the angle() function returns the angle between the lines. In addition, the unitVector() function returns a line that has the same starting point as this line, but with a length of only 1, while the normalVector() function returns a line that is perpendicular to this line with the same starting point and length.
Finally, the line can be translated a given offset using the translate() function, and can be traversed using the pointAt() function.
Describes the intersection between two lines.
QLineF::UnboundedIntersection  QLineF::BoundedIntersection 
Constant  Value  Description 

QLineF::NoIntersection  0  Indicates that the lines do not intersect; i.e. they are parallel. 
QLineF::UnboundedIntersection  2  The two lines intersect, but not within the range defined by their lengths. This will be the case if the lines are not parallel. 
intersect() will also return this value if the intersect point is within the start and end point of only one of the lines.
Constant  Value  Description 

QLineF::BoundedIntersection  1  The two lines intersect with each other within the start and end points of each line. 

default 
Constructs a null line.
Constructs a line object that represents the line between point1 and point2.

inline 
Construct a QLineF object from the given integerbased line.
qreal QLineF::angle  (  )  const 
Returns the angle of the line in degrees.
The return value will be in the range of values from 0.0 up to but not including 360.0. The angles are measured counterclockwise from a point on the xaxis to the right of the origin (x > 0).

deprecated 
When the lines are parallel, this function returns 0 if they have the same direction, otherwise it returns 180.
qreal QLineF::angleTo  (  const QLineF &  lineF  )  const 
Returns the angle (in positive degrees) from this line to the given lineF, taking the direction of the lines into account. If the lines do not intersect within their range, it is the intersection point of the extended lines that serves as origin (see QLineF::UnboundedIntersection).
The returned value represents the number of degrees you need to add to this line to make it have the same angle as the given lineF, going counterclockwise.

inline 

inline 
Returns a QLineF with the given length and angle. The first point of the line will be on the origin.
Positive values for the angles mean counterclockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.
IntersectType QLineF::intersect  (  const QLineF &  lineF, 
QPointF *  intersectionPoint  
)  const 
Returns a value indicating whether or not the current QLineF intersects with the given lineF. The actual intersection point is extracted to intersectionPoint (if the pointer is valid). If the lines are parallel the intersection point is undefined.
bool QLineF::isNull  (  )  const 
Returns true if the line is not set up with valid start and end point,, otherwise returns false.
qreal QLineF::length  (  )  const 
Returns the length of the line.

inline 
Returns a line that is perpendicular to this line with the same starting point and length.

inline 
Returns true if the given lineF is not the same as the current object. A line is different from another line if their start or end points differ, or the internal order of the points is different.

inline 
Returns true if the given lineF is the same as this line. A line is identical to another line if the start and end points are identical, and the internal order of the points is the same.

inline 
void QLineF::setAngle  (  qreal  angle  ) 
Sets the angle of the line to the given angle (in degrees). This will change the position of the second point of the line such that the line has the given angle.
Positive values for the angles mean counterclockwise while negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.

inline 

inline 

inline 

inline 
Returns an integer based copy of this line.
Note that the returned line's start and end points are rounded to the nearest integer.

inline 
Translates this line by the given offset.
Translates this line the distance specified by dx and dy.

inline 
Returns this line translated by the given offset.
Returns this line translated the distance specified by dx and dy.
QLineF QLineF::unitVector  (  )  const 
Returns the unit vector for this line. A unit vector is a line starting at the same point as this line with a length of 1.0.

related 
Writes the given line to the given stream and returns a reference to the stream.
Refer to Serializing Data Types for additional information.

related 
Reads a line from the given stream into the given line and returns a reference to the stream.
Refer to Serializing Data Types for additional information.