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1 | -- Created on: 1993-03-24 |
2 | -- Created by: JCV |
3 | -- Copyright (c) 1993-1999 Matra Datavision |
4 | -- Copyright (c) 1999-2012 OPEN CASCADE SAS |
5 | -- |
6 | -- The content of this file is subject to the Open CASCADE Technology Public |
7 | -- License Version 6.5 (the "License"). You may not use the content of this file |
8 | -- except in compliance with the License. Please obtain a copy of the License |
9 | -- at http://www.opencascade.org and read it completely before using this file. |
10 | -- |
11 | -- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its |
12 | -- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France. |
13 | -- |
14 | -- The Original Code and all software distributed under the License is |
15 | -- distributed on an "AS IS" basis, without warranty of any kind, and the |
16 | -- Initial Developer hereby disclaims all such warranties, including without |
17 | -- limitation, any warranties of merchantability, fitness for a particular |
18 | -- purpose or non-infringement. Please see the License for the specific terms |
19 | -- and conditions governing the rights and limitations under the License. |
20 | |
7fd59977 |
21 | |
7fd59977 |
22 | |
23 | deferred class Conic from Geom2d inherits Curve from Geom2d |
24 | |
25 | --- Purpose : The abstract class Conic describes the common |
26 | -- behavior of conic curves in 2D space and, in |
27 | -- particular, their general characteristics. The Geom2d |
28 | -- package provides four specific classes of conics: |
29 | -- Geom2d_Circle, Geom2d_Ellipse, |
30 | -- Geom2d_Hyperbola and Geom2d_Parabola. |
31 | -- A conic is positioned in the plane with a coordinate |
32 | -- system (gp_Ax22d object), where the origin is the |
33 | -- center of the conic (or the apex in case of a parabola). |
34 | -- This coordinate system is the local coordinate |
35 | -- system of the conic. It gives the conic an explicit |
36 | -- orientation, determining the direction in which the |
37 | -- parameter increases along the conic. The "X Axis" of |
38 | -- the local coordinate system also defines the origin of |
39 | -- the parameter of the conic. |
40 | |
41 | uses Ax2d from gp, |
42 | Ax22d from gp, |
43 | Pnt2d from gp, |
44 | Vec2d from gp, |
45 | Shape from GeomAbs |
46 | |
47 | |
48 | raises ConstructionError from Standard, |
49 | DomainError from Standard |
50 | |
51 | |
52 | is |
53 | |
54 | |
55 | SetAxis (me: mutable; A: Ax22d); |
56 | |
57 | ---Purpose: Modifies this conic, redefining its local coordinate system |
58 | -- partially, by assigning P as its origin |
59 | |
60 | SetXAxis (me : mutable; A : Ax2d); |
61 | |
62 | |
63 | SetYAxis (me : mutable; A : Ax2d); |
64 | ---Purpose: Assigns the origin and unit vector of axis A to the |
65 | -- origin of the local coordinate system of this conic and either: |
66 | -- - its "X Direction", or |
67 | -- - its "Y Direction". |
68 | -- The other unit vector of the local coordinate system |
69 | -- of this conic is recomputed normal to A, without |
70 | -- changing the orientation of the local coordinate |
71 | -- system (right-handed or left-handed). |
72 | |
73 | SetLocation (me : mutable; P : Pnt2d); |
74 | --- Purpose : Modifies this conic, redefining its local coordinate |
75 | -- system fully, by assigning A as this coordinate system. |
76 | |
77 | |
78 | XAxis (me) returns Ax2d; |
79 | --- Purpose : |
80 | -- Returns the "XAxis" of the conic. |
81 | -- This axis defines the origin of parametrization of the conic. |
82 | -- This axis and the "Yaxis" define the local coordinate system |
83 | -- of the conic. |
84 | -- -C++: return const& |
85 | |
86 | |
87 | YAxis (me) returns Ax2d; |
88 | --- Purpose : |
89 | -- Returns the "YAxis" of the conic. |
90 | -- The "YAxis" is perpendicular to the "Xaxis". |
91 | |
92 | |
93 | Eccentricity (me) returns Real |
94 | --- Purpose : |
95 | -- returns the eccentricity value of the conic e. |
96 | -- e = 0 for a circle |
97 | -- 0 < e < 1 for an ellipse (e = 0 if MajorRadius = MinorRadius) |
98 | -- e > 1 for a hyperbola |
99 | -- e = 1 for a parabola |
100 | raises DomainError |
101 | is deferred; |
102 | |
103 | |
104 | Location (me) returns Pnt2d; |
105 | --- Purpose : |
106 | -- Returns the location point of the conic. |
107 | -- For the circle, the ellipse and the hyperbola it is the center of |
108 | -- the conic. For the parabola it is the vertex of the parabola. |
109 | |
110 | |
111 | |
112 | Position (me) returns Ax22d; |
113 | ---Purpose : |
114 | -- Returns the local coordinates system of the conic. |
115 | ---C++: return const& |
116 | |
117 | |
118 | Reverse (me : mutable); |
119 | --- Purpose : |
120 | -- Reverses the direction of parameterization of <me>. |
121 | -- The local coordinate system of the conic is modified. |
122 | |
123 | |
124 | ReversedParameter(me; U : Real) returns Real |
125 | ---Purpose: Returns the parameter on the reversed curve for |
126 | -- the point of parameter U on <me>. |
127 | -- |
128 | is deferred; |
129 | |
130 | |
131 | Continuity (me) returns Shape from GeomAbs; |
132 | --- Purpose : Returns GeomAbs_CN which is the global continuity of any conic. |
133 | |
134 | |
135 | IsCN (me; N : Integer) returns Boolean; |
136 | --- Purpose : |
137 | -- Returns True, the order of continuity of a conic is infinite. |
138 | |
139 | |
140 | |
141 | |
142 | |
143 | fields |
144 | |
145 | pos : Ax22d is protected; |
146 | |
147 | end; |
148 | |