Open CASCADE Technology  6.5.4
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Public Member Functions
gp_Lin2d Class Reference

Describes a line in 2D space.
A line is positioned in the plane with an axis (a gp_Ax2d
object) which gives the line its origin and unit vector. A
line and an axis are similar objects, thus, we can convert
one into the other.
A line provides direct access to the majority of the edit
and query functions available on its positioning axis. In
addition, however, a line has specific functions for
computing distances and positions.
See Also
GccAna and Geom2dGcc packages which provide
functions for constructing lines defined by geometric
constraints
gce_MakeLin2d which provides functions for more
complex line constructions
Geom2d_Line which provides additional functions for
constructing lines and works, in particular, with the
parametric equations of lines

#include <gp_Lin2d.hxx>

Public Member Functions

DEFINE_STANDARD_ALLOC gp_Lin2d ()
 Creates a Line corresponding to X axis of the
reference coordinate system.

 gp_Lin2d (const gp_Ax2d &A)
 Creates a line located with A.

 gp_Lin2d (const gp_Pnt2d &P, const gp_Dir2d &V)
 gp_Lin2d (const Standard_Real A, const Standard_Real B, const Standard_Real C)
 Creates the line from the equation A*X + B*Y + C = 0.0 Raises ConstructionError if Sqrt(A*A + B*B) <= Resolution from gp.
//! Raised if Sqrt(A*A + B*B) <= Resolution from gp.

void Reverse ()
gp_Lin2d Reversed () const
 Reverses the positioning axis of this line.
Note:

void SetDirection (const gp_Dir2d &V)
 Changes the direction of the line.

void SetLocation (const gp_Pnt2d &P)
 Changes the origin of the line.

void SetPosition (const gp_Ax2d &A)
 Complete redefinition of the line.
The "Location" point of is the origin of the line.
The "Direction" of is the direction of the line.

void Coefficients (Standard_Real &A, Standard_Real &B, Standard_Real &C) const
 Returns the normalized coefficients of the line :
A * X + B * Y + C = 0.

const gp_Dir2dDirection () const
 Returns the direction of the line.

const gp_Pnt2dLocation () const
 Returns the location point (origin) of the line.

const gp_Ax2dPosition () const
 Returns the axis placement one axis whith the same
location and direction as <me>.

Standard_Real Angle (const gp_Lin2d &Other) const
 Computes the angle between two lines in radians.

Standard_Boolean Contains (const gp_Pnt2d &P, const Standard_Real LinearTolerance) const
 Returns true if this line contains the point P, that is, if the
distance between point P and this line is less than or
equal to LinearTolerance.

Standard_Real Distance (const gp_Pnt2d &P) const
 Computes the distance between <me> and the point.
Standard_Real Distance (const gp_Lin2d &Other) const
 Computes the distance between two lines.

Standard_Real SquareDistance (const gp_Pnt2d &P) const
 Computes the square distance between <me> and the point

Standard_Real SquareDistance (const gp_Lin2d &Other) const
 Computes the square distance between two lines.

gp_Lin2d Normal (const gp_Pnt2d &P) const
 Computes the line normal to the direction of <me>,
passing through the point.
void Mirror (const gp_Pnt2d &P)
gp_Lin2d Mirrored (const gp_Pnt2d &P) const
 Performs the symmetrical transformation of a line
with respect to the point.
void Mirror (const gp_Ax2d &A)
gp_Lin2d Mirrored (const gp_Ax2d &A) const
 Performs the symmetrical transformation of a line
with respect to an axis placement which is the axis
of the symmetry.

void Rotate (const gp_Pnt2d &P, const Standard_Real Ang)
gp_Lin2d Rotated (const gp_Pnt2d &P, const Standard_Real Ang) const
 Rotates a line. P is the center of the rotation.
Ang is the angular value of the rotation in radians.

void Scale (const gp_Pnt2d &P, const Standard_Real S)
gp_Lin2d Scaled (const gp_Pnt2d &P, const Standard_Real S) const
 Scales a line. S is the scaling value. Only the
origin of the line is modified.

void Transform (const gp_Trsf2d &T)
gp_Lin2d Transformed (const gp_Trsf2d &T) const
 Transforms a line with the transformation T from class Trsf2d.

void Translate (const gp_Vec2d &V)
gp_Lin2d Translated (const gp_Vec2d &V) const
 Translates a line in the direction of the vector V.
The magnitude of the translation is the vector's magnitude.

void Translate (const gp_Pnt2d &P1, const gp_Pnt2d &P2)
gp_Lin2d Translated (const gp_Pnt2d &P1, const gp_Pnt2d &P2) const
 Translates a line from the point P1 to the point P2.

const gp_Ax2d_CSFDB_Getgp_Lin2dpos () const

Constructor & Destructor Documentation

is the location point (origin) of the line and
<V> is the direction of the line.


Member Function Documentation

Standard_Boolean gp_Lin2d::Contains ( const gp_Pnt2d P,
const Standard_Real  LinearTolerance 
) const

.

which is the center
of the symmetry

.

  • Reverse assigns the result to this line, while
  • Reversed creates a new one.

.


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