blob: dfa5a9d9ad73f7cc6ea41f3bc2e584ac7843b168 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
-- File: MakeParab.cdl
-- Created: Wed Aug 26 14:31:48 1992
-- Author: Remi GILET
-- <reg@topsn3>
---Copyright: Matra Datavision 1992
class MakeParab from gce inherits Root from gce
---Purpose :This class implements the following algorithms used to
-- create Parab from gp.
-- Defines the parabola in the parameterization range :
-- ]-infinite, +infinite[
-- The vertex of the parabola is the "Location" point of the
-- local coordinate system (axis placement) of the parabola.
--
-- The "XDirection" and the "YDirection" of this system define
-- the plane of the parabola.
--
-- The "XAxis" of the parabola ("Location", "XDirection") is
-- the axis of symmetry of the parabola. The Xaxis is oriented
-- from the vertex of the parabola to the Focus of the parabola.
--
-- The "YAxis" of the parabola ("Location", "YDirection") is
-- parallel to the directrix of the parabola.
--
-- The equation of the parabola in the local coordinates system is
-- Y**2 = (2*P) * X
-- P is the distance between the focus and the directrix of the
-- parabola (called Parameter).
-- The focal length F = P/2 is the distance between the vertex
-- and the focus of the parabola.
--
-- * Creates a parabola with its local coordinate system "A2"
-- and it's focal length "Focal".
-- * Create a parabola with its directrix and its focus point.
uses Pnt from gp,
Parab from gp,
Ax2 from gp,
Ax1 from gp
raises NotDone from StdFail
is
Create (A2 : Ax2 from gp ;
Focal : Real from Standard) returns MakeParab;
--- Purpose ;
-- Creates a parabola with its local coordinate system "A2"
-- and it's focal length "Focal".
-- The XDirection of A2 defines the axis of symmetry of the
-- parabola. The YDirection of A2 is parallel to the directrix
-- of the parabola. The Location point of A2 is the vertex of
-- the parabola
-- The status is "NullFocusLength" if Focal < 0.0
Create (D : Ax1 from gp ;
F : Pnt from gp ) returns MakeParab;
--- Purpose :
-- D is the directrix of the parabola and F the focus point.
-- The symmetry axis (XAxis) of the parabola is normal to the
-- directrix and pass through the focus point F, but its
-- location point is the vertex of the parabola.
-- The YAxis of the parabola is parallel to D and its location
-- point is the vertex of the parabola. The normal to the plane
-- of the parabola is the cross product between the XAxis and the
-- YAxis.
Value(me) returns Parab from gp
raises NotDone
is static;
---C++: return const&
---Purpose: Returns the constructed parabola.
-- Exceptions StdFail_NotDone if no parabola is constructed.
Operator(me) returns Parab from gp
is static;
---C++: return const&
---C++: alias "Standard_EXPORT operator gp_Parab() const;"
fields
TheParab : Parab from gp;
--The solution from gp.
end MakeParab;
|
