2D Geometry
Geom2d package. 객체는 참조로 다뤄짐.
- description of points, vectors and curves,
- positioning in the plane using coordinate systems,
- geometric transformation - translations, rotations, symmetries, scaling transformations and combinations thereof.
objects;
- point,
- Cartesian point,
- vector,
- direction,
- vector with magnitude,
- axis,
- curve,
- line,
- conic: circle, ellipse, hyperbola, parabola,
- rounded curve: trimmed curve, NURBS curve, Bezier curve,
- offset curve.
object set은 TColGeom2d package 사용
1D arrays and sequences for curves
- handled by reference
- handled by value.
Geom2d curves : functions to work with the parametric equation
point of parameter u on a curve and the derivative vectors of order 1, 2.., N at this point.
-> Geom2d curve is naturally oriented.
Geom2d curves는 parameterization과 orientation 이 있으나, gp package는 그렇지 않다.
gp 객체와의 conversion도 제공한다.
추상 클래스로부터의 상속 구조;
Geom2d_Ellipse : Geom2d_Conic
Geom2d_BezierCurve : Geom2d_BoundedCurve
Curves, points and vectors : Geom2d_Geometry
Geom2d package는 gp package로 아래 작업을 수행;
- implement elementary algebraic calculus and basic analytic geometry,
- describe geometric transformations which can be applied to Geom2d objects,
- describe the elementary data structures of Geom2d objects.
Geom2d package는 데이터 구조만 제공함.
알고리즘은 GCE2d 가 제공.
