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1 | // Copyright (c) 1991-1999 Matra Datavision |
2 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
3 | // |
4 | // This file is part of Open CASCADE Technology software library. |
5 | // |
6 | // This library is free software; you can redistribute it and/or modify it under |
7 | // the terms of the GNU Lesser General Public License version 2.1 as published |
8 | // by the Free Software Foundation, with special exception defined in the file |
9 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
10 | // distribution for complete text of the license and disclaimer of any warranty. |
11 | // |
12 | // Alternatively, this file may be used under the terms of Open CASCADE |
13 | // commercial license or contractual agreement. |
14 | |
15 | #ifndef _gp_Lin2d_HeaderFile |
16 | #define _gp_Lin2d_HeaderFile |
17 | |
18 | #include <Standard.hxx> |
19 | #include <Standard_DefineAlloc.hxx> |
20 | #include <Standard_Handle.hxx> |
21 | |
22 | #include <gp_Ax2d.hxx> |
23 | #include <Standard_Real.hxx> |
24 | #include <Standard_Boolean.hxx> |
25 | class Standard_ConstructionError; |
26 | class gp_Ax2d; |
27 | class gp_Pnt2d; |
28 | class gp_Dir2d; |
29 | class gp_Trsf2d; |
30 | class gp_Vec2d; |
31 | |
32 | |
33 | //! Describes a line in 2D space. |
34 | //! A line is positioned in the plane with an axis (a gp_Ax2d |
35 | //! object) which gives the line its origin and unit vector. A |
36 | //! line and an axis are similar objects, thus, we can convert |
37 | //! one into the other. |
38 | //! A line provides direct access to the majority of the edit |
39 | //! and query functions available on its positioning axis. In |
40 | //! addition, however, a line has specific functions for |
41 | //! computing distances and positions. |
42 | //! See Also |
43 | //! GccAna and Geom2dGcc packages which provide |
44 | //! functions for constructing lines defined by geometric |
45 | //! constraints |
46 | //! gce_MakeLin2d which provides functions for more |
47 | //! complex line constructions |
48 | //! Geom2d_Line which provides additional functions for |
49 | //! constructing lines and works, in particular, with the |
50 | //! parametric equations of lines |
51 | class gp_Lin2d |
52 | { |
53 | public: |
54 | |
55 | DEFINE_STANDARD_ALLOC |
56 | |
57 | |
58 | //! Creates a Line corresponding to X axis of the |
59 | //! reference coordinate system. |
60 | gp_Lin2d(); |
61 | |
62 | //! Creates a line located with A. |
63 | gp_Lin2d(const gp_Ax2d& A); |
64 | |
65 | |
66 | //! <P> is the location point (origin) of the line and |
67 | //! <V> is the direction of the line. |
68 | gp_Lin2d(const gp_Pnt2d& P, const gp_Dir2d& V); |
69 | |
70 | |
71 | //! Creates the line from the equation A*X + B*Y + C = 0.0 Raises ConstructionError if Sqrt(A*A + B*B) <= Resolution from gp. |
72 | //! Raised if Sqrt(A*A + B*B) <= Resolution from gp. |
73 | Standard_EXPORT gp_Lin2d(const Standard_Real A, const Standard_Real B, const Standard_Real C); |
74 | |
75 | void Reverse(); |
76 | |
77 | |
78 | //! Reverses the positioning axis of this line. |
79 | //! Note: |
80 | //! - Reverse assigns the result to this line, while |
81 | //! - Reversed creates a new one. |
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82 | Standard_NODISCARD gp_Lin2d Reversed() const; |
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83 | |
84 | //! Changes the direction of the line. |
85 | void SetDirection (const gp_Dir2d& V); |
86 | |
87 | //! Changes the origin of the line. |
88 | void SetLocation (const gp_Pnt2d& P); |
89 | |
90 | |
91 | //! Complete redefinition of the line. |
92 | //! The "Location" point of <A> is the origin of the line. |
93 | //! The "Direction" of <A> is the direction of the line. |
94 | void SetPosition (const gp_Ax2d& A); |
95 | |
96 | |
97 | //! Returns the normalized coefficients of the line : |
98 | //! A * X + B * Y + C = 0. |
99 | void Coefficients (Standard_Real& A, Standard_Real& B, Standard_Real& C) const; |
100 | |
101 | //! Returns the direction of the line. |
102 | const gp_Dir2d& Direction() const; |
103 | |
104 | //! Returns the location point (origin) of the line. |
105 | const gp_Pnt2d& Location() const; |
106 | |
107 | |
108 | //! Returns the axis placement one axis whith the same |
109 | //! location and direction as <me>. |
110 | const gp_Ax2d& Position() const; |
111 | |
112 | //! Computes the angle between two lines in radians. |
113 | Standard_Real Angle (const gp_Lin2d& Other) const; |
114 | |
115 | //! Returns true if this line contains the point P, that is, if the |
116 | //! distance between point P and this line is less than or |
117 | //! equal to LinearTolerance. |
118 | Standard_Boolean Contains (const gp_Pnt2d& P, const Standard_Real LinearTolerance) const; |
119 | |
120 | |
121 | //! Computes the distance between <me> and the point <P>. |
122 | Standard_Real Distance (const gp_Pnt2d& P) const; |
123 | |
124 | //! Computes the distance between two lines. |
125 | Standard_Real Distance (const gp_Lin2d& Other) const; |
126 | |
127 | |
128 | //! Computes the square distance between <me> and the point |
129 | //! <P>. |
130 | Standard_Real SquareDistance (const gp_Pnt2d& P) const; |
131 | |
132 | //! Computes the square distance between two lines. |
133 | Standard_Real SquareDistance (const gp_Lin2d& Other) const; |
134 | |
135 | |
136 | //! Computes the line normal to the direction of <me>, |
137 | //! passing through the point <P>. |
138 | gp_Lin2d Normal (const gp_Pnt2d& P) const; |
139 | |
140 | Standard_EXPORT void Mirror (const gp_Pnt2d& P); |
141 | |
142 | |
143 | //! Performs the symmetrical transformation of a line |
144 | //! with respect to the point <P> which is the center |
145 | //! of the symmetry |
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146 | Standard_NODISCARD Standard_EXPORT gp_Lin2d Mirrored (const gp_Pnt2d& P) const; |
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147 | |
148 | Standard_EXPORT void Mirror (const gp_Ax2d& A); |
149 | |
150 | |
151 | //! Performs the symmetrical transformation of a line |
152 | //! with respect to an axis placement which is the axis |
153 | //! of the symmetry. |
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154 | Standard_NODISCARD Standard_EXPORT gp_Lin2d Mirrored (const gp_Ax2d& A) const; |
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155 | |
156 | void Rotate (const gp_Pnt2d& P, const Standard_Real Ang); |
157 | |
158 | |
159 | //! Rotates a line. P is the center of the rotation. |
160 | //! Ang is the angular value of the rotation in radians. |
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161 | Standard_NODISCARD gp_Lin2d Rotated (const gp_Pnt2d& P, const Standard_Real Ang) const; |
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162 | |
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163 | void Scale (const gp_Pnt2d& P, const Standard_Real S); |
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164 | |
165 | |
166 | //! Scales a line. S is the scaling value. Only the |
167 | //! origin of the line is modified. |
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168 | Standard_NODISCARD gp_Lin2d Scaled (const gp_Pnt2d& P, const Standard_Real S) const; |
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169 | |
170 | void Transform (const gp_Trsf2d& T); |
171 | |
172 | |
173 | //! Transforms a line with the transformation T from class Trsf2d. |
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174 | Standard_NODISCARD gp_Lin2d Transformed (const gp_Trsf2d& T) const; |
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175 | |
176 | void Translate (const gp_Vec2d& V); |
177 | |
178 | |
179 | //! Translates a line in the direction of the vector V. |
180 | //! The magnitude of the translation is the vector's magnitude. |
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181 | Standard_NODISCARD gp_Lin2d Translated (const gp_Vec2d& V) const; |
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182 | |
183 | void Translate (const gp_Pnt2d& P1, const gp_Pnt2d& P2); |
184 | |
185 | |
186 | //! Translates a line from the point P1 to the point P2. |
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187 | Standard_NODISCARD gp_Lin2d Translated (const gp_Pnt2d& P1, const gp_Pnt2d& P2) const; |
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188 | |
189 | |
190 | |
191 | |
192 | protected: |
193 | |
194 | |
195 | |
196 | |
197 | |
198 | private: |
199 | |
200 | |
201 | |
202 | gp_Ax2d pos; |
203 | |
204 | |
205 | }; |
206 | |
207 | |
208 | #include <gp_Lin2d.lxx> |
209 | |
210 | |
211 | |
212 | |
213 | |
214 | #endif // _gp_Lin2d_HeaderFile |