b311480e |
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 | |
24 | |
25 | deferred class BoundedCurve from Geom2d inherits Curve from Geom2d |
26 | |
27 | --- Purpose : The abstract class BoundedCurve describes the |
28 | -- common behavior of bounded curves in 2D space. A |
29 | -- bounded curve is limited by two finite values of the |
30 | -- parameter, termed respectively "first parameter" and |
31 | -- "last parameter". The "first parameter" gives the "start |
32 | -- point" of the bounded curve, and the "last parameter" |
33 | -- gives the "end point" of the bounded curve. |
34 | -- The length of a bounded curve is finite. |
35 | -- The Geom2d package provides three concrete |
36 | -- classes of bounded curves: |
37 | -- - two frequently used mathematical formulations of complex curves: |
38 | -- - Geom2d_BezierCurve, |
39 | -- - Geom2d_BSplineCurve, and |
40 | -- - Geom2d_TrimmedCurve to trim a curve, i.e. to |
41 | -- only take part of the curve limited by two values of |
42 | -- the parameter of the basis curve. |
43 | |
44 | uses Pnt2d from gp |
45 | |
46 | |
47 | is |
48 | |
49 | EndPoint (me) returns Pnt2d is deferred; |
50 | --- Purpose : |
51 | -- Returns the end point of the curve. |
52 | -- The end point is the value of the curve for the |
53 | -- "LastParameter" of the curve. |
54 | |
55 | |
56 | StartPoint (me) returns Pnt2d is deferred; |
57 | --- Purpose : |
58 | -- Returns the start point of the curve. |
59 | -- The start point is the value of the curve for the |
60 | -- "FirstParameter" of the curve. |
61 | |
62 | |
63 | end; |