1 // Created on: 2014-05-22
2 // Created by: Varvara POSKONINA
3 // Copyright (c) 2005-2014 OPEN CASCADE SAS
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #ifndef _SelectMgr_RectangularFrustum_HeaderFile
17 #define _SelectMgr_RectangularFrustum_HeaderFile
19 #include <SelectMgr_Frustum.hxx>
21 //! This class contains representation of rectangular selecting frustum, created in case
22 //! of point and box selection, and algorithms for overlap detection between selecting
23 //! frustum and sensitive entities. The principle of frustum calculation:
24 //! - for point selection: on a near view frustum plane rectangular neighborhood of
25 //! user-picked point is created according to the pixel tolerance
26 //! given and then this rectangle is projected onto far view frustum
27 //! plane. This rectangles define the parallel bases of selecting frustum;
28 //! - for box selection: box points are projected onto near and far view frustum planes.
29 //! These 2 projected rectangles define parallel bases of selecting frustum.
30 //! Overlap detection tests are implemented according to the terms of separating axis
32 class SelectMgr_RectangularFrustum : public SelectMgr_Frustum<4>
36 SelectMgr_RectangularFrustum() {};
38 //! Builds volume according to the point and given pixel tolerance
39 virtual void Build (const gp_Pnt2d& thePoint) Standard_OVERRIDE;
41 //! Builds volume according to the selected rectangle
42 virtual void Build (const gp_Pnt2d& theMinPnt,
43 const gp_Pnt2d& theMaxPnt) Standard_OVERRIDE;
45 //! Returns a copy of the frustum transformed according to the matrix given
46 virtual NCollection_Handle<SelectMgr_BaseFrustum> Transform (const gp_Trsf& theTrsf) Standard_OVERRIDE;
49 // SAT Tests for different objects
51 //! SAT intersection test between defined volume and given axis-aligned box
52 virtual Standard_Boolean Overlaps (const BVH_Box<Standard_Real, 3>& theBox,
53 Standard_Real& theDepth) Standard_OVERRIDE;
55 //! Returns true if selecting volume is overlapped by axis-aligned bounding box
56 //! with minimum corner at point theMinPt and maximum at point theMaxPt
57 virtual Standard_Boolean Overlaps (const SelectMgr_Vec3& theMinPnt,
58 const SelectMgr_Vec3& theMaxPnt) Standard_OVERRIDE;
60 //! Intersection test between defined volume and given point
61 virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt,
62 Standard_Real& theDepth) Standard_OVERRIDE;
64 //! SAT intersection test between defined volume and given ordered set of points,
65 //! representing line segments. The test may be considered of interior part or
66 //! boundary line defined by segments depending on given sensitivity type
67 virtual Standard_Boolean Overlaps (const Handle(TColgp_HArray1OfPnt)& theArrayOfPnts,
68 Select3D_TypeOfSensitivity theSensType,
69 Standard_Real& theDepth) Standard_OVERRIDE;
71 //! Checks if line segment overlaps selecting frustum
72 virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt1,
73 const gp_Pnt& thePnt2,
74 Standard_Real& theDepth) Standard_OVERRIDE;
76 //! SAT intersection test between defined volume and given triangle. The test may
77 //! be considered of interior part or boundary line defined by triangle vertices
78 //! depending on given sensitivity type
79 virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt1,
80 const gp_Pnt& thePnt2,
81 const gp_Pnt& thePnt3,
82 Select3D_TypeOfSensitivity theSensType,
83 Standard_Real& theDepth) Standard_OVERRIDE;
85 //! Measures distance between 3d projection of user-picked
86 //! screen point and given point theCOG
87 virtual Standard_Real DistToGeometryCenter (const gp_Pnt& theCOG) Standard_OVERRIDE;
89 //! Calculates the point on a view ray that was detected during the run of selection algo by given depth
90 virtual SelectMgr_Vec3 DetectedPoint (const Standard_Real theDepth) const Standard_OVERRIDE;
92 //! Checks if the point of sensitive in which selection was detected belongs
93 //! to the region defined by clipping planes
94 virtual Standard_Boolean IsClipped (const Graphic3d_SequenceOfHClipPlane& thePlanes,
95 const Standard_Real theDepth) Standard_OVERRIDE;
99 void segmentSegmentDistance (const gp_Pnt& theSegPnt1,
100 const gp_Pnt& theSegPnt2,
101 Standard_Real& theDepth);
103 void segmentPlaneIntersection (const SelectMgr_Vec3& thePlane,
104 const gp_Pnt& thePntOnPlane,
105 Standard_Real& theDepth);
109 SelectMgr_Vec3 myNearPickedPnt; //!< 3d projection of user-picked selection point onto near view plane
110 SelectMgr_Vec3 myFarPickedPnt; //!< 3d projection of user-picked selection point onto far view plane
111 SelectMgr_Vec3 myViewRayDir;
114 #endif // _SelectMgr_RectangularFrustum_HeaderFile