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1 | -- Created on: 1993-03-24 |
2 | -- Created by: JCV |
3 | -- Copyright (c) 1993-1999 Matra Datavision |
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4 | -- Copyright (c) 1999-2014 OPEN CASCADE SAS |
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5 | -- |
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6 | -- This file is part of Open CASCADE Technology software library. |
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7 | -- |
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8 | -- This library is free software; you can redistribute it and/or modify it under |
9 | -- the terms of the GNU Lesser General Public License version 2.1 as published |
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10 | -- by the Free Software Foundation, with special exception defined in the file |
11 | -- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
12 | -- distribution for complete text of the license and disclaimer of any warranty. |
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13 | -- |
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14 | -- Alternatively, this file may be used under the terms of Open CASCADE |
15 | -- commercial license or contractual agreement. |
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16 | |
17 | deferred class Conic from Geom2d inherits Curve from Geom2d |
18 | |
19 | --- Purpose : The abstract class Conic describes the common |
20 | -- behavior of conic curves in 2D space and, in |
21 | -- particular, their general characteristics. The Geom2d |
22 | -- package provides four specific classes of conics: |
23 | -- Geom2d_Circle, Geom2d_Ellipse, |
24 | -- Geom2d_Hyperbola and Geom2d_Parabola. |
25 | -- A conic is positioned in the plane with a coordinate |
26 | -- system (gp_Ax22d object), where the origin is the |
27 | -- center of the conic (or the apex in case of a parabola). |
28 | -- This coordinate system is the local coordinate |
29 | -- system of the conic. It gives the conic an explicit |
30 | -- orientation, determining the direction in which the |
31 | -- parameter increases along the conic. The "X Axis" of |
32 | -- the local coordinate system also defines the origin of |
33 | -- the parameter of the conic. |
34 | |
35 | uses Ax2d from gp, |
36 | Ax22d from gp, |
37 | Pnt2d from gp, |
38 | Vec2d from gp, |
39 | Shape from GeomAbs |
40 | |
41 | |
42 | raises ConstructionError from Standard, |
43 | DomainError from Standard |
44 | |
45 | |
46 | is |
47 | |
48 | |
49 | SetAxis (me: mutable; A: Ax22d); |
50 | |
51 | ---Purpose: Modifies this conic, redefining its local coordinate system |
52 | -- partially, by assigning P as its origin |
53 | |
54 | SetXAxis (me : mutable; A : Ax2d); |
55 | |
56 | |
57 | SetYAxis (me : mutable; A : Ax2d); |
58 | ---Purpose: Assigns the origin and unit vector of axis A to the |
59 | -- origin of the local coordinate system of this conic and either: |
60 | -- - its "X Direction", or |
61 | -- - its "Y Direction". |
62 | -- The other unit vector of the local coordinate system |
63 | -- of this conic is recomputed normal to A, without |
64 | -- changing the orientation of the local coordinate |
65 | -- system (right-handed or left-handed). |
66 | |
67 | SetLocation (me : mutable; P : Pnt2d); |
68 | --- Purpose : Modifies this conic, redefining its local coordinate |
69 | -- system fully, by assigning A as this coordinate system. |
70 | |
71 | |
72 | XAxis (me) returns Ax2d; |
73 | --- Purpose : |
74 | -- Returns the "XAxis" of the conic. |
75 | -- This axis defines the origin of parametrization of the conic. |
76 | -- This axis and the "Yaxis" define the local coordinate system |
77 | -- of the conic. |
78 | -- -C++: return const& |
79 | |
80 | |
81 | YAxis (me) returns Ax2d; |
82 | --- Purpose : |
83 | -- Returns the "YAxis" of the conic. |
84 | -- The "YAxis" is perpendicular to the "Xaxis". |
85 | |
86 | |
87 | Eccentricity (me) returns Real |
88 | --- Purpose : |
89 | -- returns the eccentricity value of the conic e. |
90 | -- e = 0 for a circle |
91 | -- 0 < e < 1 for an ellipse (e = 0 if MajorRadius = MinorRadius) |
92 | -- e > 1 for a hyperbola |
93 | -- e = 1 for a parabola |
94 | raises DomainError |
95 | is deferred; |
96 | |
97 | |
98 | Location (me) returns Pnt2d; |
99 | --- Purpose : |
100 | -- Returns the location point of the conic. |
101 | -- For the circle, the ellipse and the hyperbola it is the center of |
102 | -- the conic. For the parabola it is the vertex of the parabola. |
103 | |
104 | |
105 | |
106 | Position (me) returns Ax22d; |
107 | ---Purpose : |
108 | -- Returns the local coordinates system of the conic. |
109 | ---C++: return const& |
110 | |
111 | |
112 | Reverse (me : mutable); |
113 | --- Purpose : |
114 | -- Reverses the direction of parameterization of <me>. |
115 | -- The local coordinate system of the conic is modified. |
116 | |
117 | |
118 | ReversedParameter(me; U : Real) returns Real |
119 | ---Purpose: Returns the parameter on the reversed curve for |
120 | -- the point of parameter U on <me>. |
121 | -- |
122 | is deferred; |
123 | |
124 | |
125 | Continuity (me) returns Shape from GeomAbs; |
126 | --- Purpose : Returns GeomAbs_CN which is the global continuity of any conic. |
127 | |
128 | |
129 | IsCN (me; N : Integer) returns Boolean; |
130 | --- Purpose : |
131 | -- Returns True, the order of continuity of a conic is infinite. |
132 | |
133 | |
134 | |
135 | |
136 | |
137 | fields |
138 | |
139 | pos : Ax22d is protected; |
140 | |
141 | end; |
142 | |