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---Copyright: Matra Datavision 1991
class Ax22d from gp inherits Storable
--- Purpose :
-- Describes a coordinate system in a plane (2D space).
-- A coordinate system is defined by:
-- - its origin (also referred to as its "Location point"), and
-- - two orthogonal unit vectors, respectively, called the "X
-- Direction" and the "Y Direction".
-- A gp_Ax22d may be right-handed ("direct sense") or
-- left-handed ("inverse" or "indirect sense").
-- You use a gp_Ax22d to:
-- - describe 2D geometric entities, in particular to position
-- them. The local coordinate system of a geometric
-- entity serves for the same purpose as the STEP
-- function "axis placement two axes", or
-- - define geometric transformations.
-- Note: we refer to the "X Axis" and "Y Axis" as the axes having:
-- - the origin of the coordinate system as their origin, and
-- - the unit vectors "X Direction" and "Y Direction",
-- respectively, as their unit vectors.
uses Ax2d from gp,
Dir2d from gp,
Pnt2d from gp,
Trsf2d from gp,
Vec2d from gp
raises ConstructionError from Standard
is
Create returns Ax22d;
---C++:inline
--- Purpose : Creates an object representing the reference
-- co-ordinate system (OXY).
Create (P : Pnt2d; Vx, Vy : Dir2d) returns Ax22d
---C++:inline
--- Purpose :
-- Creates a coordinate system with origin P and where:
-- - Vx is the "X Direction", and
-- - the "Y Direction" is orthogonal to Vx and
-- oriented so that the cross products Vx^"Y
-- Direction" and Vx^Vy have the same sign.
-- Raises ConstructionError if Vx and Vy are parallel (same or opposite orientation).
raises ConstructionError;
Create (P : Pnt2d;
V : Dir2d;
Sense : Boolean from Standard = Standard_True) returns Ax22d;
---C++:inline
--- Purpose :
-- Creates - a coordinate system with origin P and "X Direction"
-- V, which is:
-- - right-handed if Sense is true (default value), or
-- - left-handed if Sense is false
Create (A : Ax2d;
Sense : Boolean from Standard = Standard_True) returns Ax22d;
---C++:inline
--- Purpose :
-- Creates - a coordinate system where its origin is the origin of
-- A and its "X Direction" is the unit vector of A, which is:
-- - right-handed if Sense is true (default value), or
-- - left-handed if Sense is false.
SetAxis (me : in out; A1 : Ax22d)
---C++:inline
--- Purpose :
-- Assigns the origin and the two unit vectors of the
-- coordinate system A1 to this coordinate system.
is static;
SetXAxis (me : in out; A1 : Ax2d)
---C++:inline
--- Purpose :
-- Changes the XAxis and YAxis ("Location" point and "Direction")
-- of <me>.
-- The "YDirection" is recomputed in the same sense as before.
is static;
SetYAxis (me : in out; A1 : Ax2d)
---C++:inline
--- Purpose : Changes the XAxis and YAxis ("Location" point and "Direction") of <me>.
-- The "XDirection" is recomputed in the same sense as before.
is static;
SetLocation (me : in out; P : Pnt2d) is static;
---C++:inline
--- Purpose :
-- Changes the "Location" point (origin) of <me>.
SetXDirection (me : in out; Vx : Dir2d)
---C++:inline
--- Purpose :
-- Assigns Vx to the "X Direction" of
-- this coordinate system. The other unit vector of this
-- coordinate system is recomputed, normal to Vx ,
-- without modifying the orientation (right-handed or
-- left-handed) of this coordinate system.
is static;
SetYDirection(me : in out; Vy : Dir2d)
---C++:inline
--- Purpose : Assignsr Vy to the "Y Direction" of
-- this coordinate system. The other unit vector of this
-- coordinate system is recomputed, normal to Vy,
-- without modifying the orientation (right-handed or
-- left-handed) of this coordinate system.
is static;
XAxis (me) returns Ax2d is static;
---C++:inline
--- Purpose : Returns an axis, for which
-- - the origin is that of this coordinate system, and
-- - the unit vector is either the "X Direction" of this coordinate system.
-- Note: the result is the "X Axis" of this coordinate system.
YAxis (me) returns Ax2d is static;
---C++:inline
--- Purpose : Returns an axis, for which
-- - the origin is that of this coordinate system, and
-- - the unit vector is either the "Y Direction" of this coordinate system.
-- Note: the result is the "Y Axis" of this coordinate system.
Location (me) returns Pnt2d is static;
---C++:inline
--- Purpose :
-- Returns the "Location" point (origin) of <me>.
---C++: return const&
XDirection (me) returns Dir2d is static;
---C++:inline
--- Purpose :
-- Returns the "XDirection" of <me>.
---C++: return const&
YDirection(me) returns Dir2d is static;
---C++:inline
--- Purpose :
-- Returns the "YDirection" of <me>.
---C++: return const&
Mirror (me : in out; P : Pnt2d) is static;
Mirrored (me; P : Pnt2d) returns Ax22d is static;
--- Purpose :
-- Performs the symmetrical transformation of an axis
-- placement with respect to the point P which is the
-- center of the symmetry.
--- Warnings :
-- The main direction of the axis placement is not changed.
-- The "XDirection" and the "YDirection" are reversed.
-- So the axis placement stay right handed.
Mirror (me : in out; A : Ax2d) is static;
Mirrored (me; A : Ax2d) returns Ax22d is static;
--- Purpose :
-- Performs the symmetrical transformation of an axis
-- placement with respect to an axis placement which
-- is the axis of the symmetry.
-- The transformation is performed on the "Location"
-- point, on the "XDirection" and "YDirection".
-- The resulting main "Direction" is the cross product between
-- the "XDirection" and the "YDirection" after transformation.
Rotate (me : in out; P : Pnt2d; Ang : Real) is static;
---C++:inline
Rotated (me; P : Pnt2d; Ang : Real) returns Ax22d is static;
---C++:inline
--- Purpose :
-- Rotates an axis placement. <A1> is the axis of the
-- rotation . Ang is the angular value of the rotation
-- in radians.
Scale (me : in out; P : Pnt2d; S : Real) is static;
---C++:inline
Scaled (me; P : Pnt2d; S : Real) returns Ax22d is static;
---C++:inline
--- Purpose :
-- Applies a scaling transformation on the axis placement.
-- The "Location" point of the axisplacement is modified.
--- Warnings :
-- If the scale <S> is negative :
-- . the main direction of the axis placement is not changed.
-- . The "XDirection" and the "YDirection" are reversed.
-- So the axis placement stay right handed.
Transform (me : in out; T : Trsf2d) is static;
---C++:inline
Transformed (me; T : Trsf2d) returns Ax22d is static;
---C++:inline
--- Purpose :
-- Transforms an axis placement with a Trsf.
-- The "Location" point, the "XDirection" and the
-- "YDirection" are transformed with T. The resulting
-- main "Direction" of <me> is the cross product between
-- the "XDirection" and the "YDirection" after transformation.
Translate (me : in out; V : Vec2d)
---C++:inline
is static;
Translated (me; V : Vec2d) returns Ax22d is static;
---C++:inline
--- Purpose :
-- Translates an axis plaxement in the direction of the vector
-- <V>. The magnitude of the translation is the vector's magnitude.
Translate (me : in out; P1, P2 : Pnt2d)
---C++:inline
is static;
Translated (me; P1, P2 : Pnt2d) returns Ax22d is static;
---C++:inline
--- Purpose :
-- Translates an axis placement from the point <P1> to the
-- point <P2>.
fields
point : Pnt2d;
vydir : Dir2d;
vxdir : Dir2d;
end;
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