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[occt.git] / src / SelectMgr / SelectMgr_RectangularFrustum.hxx
1 // Created on: 2014-05-22
2 // Created by: Varvara POSKONINA
3 // Copyright (c) 2005-2014 OPEN CASCADE SAS
4 //
5 // This file is part of Open CASCADE Technology software library.
6 //
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.
12 //
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
15
16 #ifndef _SelectMgr_RectangularFrustum_HeaderFile
17 #define _SelectMgr_RectangularFrustum_HeaderFile
18
19 #include <SelectMgr_Frustum.hxx>
20
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
31 //! theorem (SAT).
32 class SelectMgr_RectangularFrustum : public SelectMgr_Frustum<4>
33 {
34 public:
35
36   SelectMgr_RectangularFrustum() : myScale (1.0) {};
37
38   //! Builds volume according to the point and given pixel tolerance
39   Standard_EXPORT virtual void Build (const gp_Pnt2d& thePoint) Standard_OVERRIDE;
40
41   //! Builds volume according to the selected rectangle
42   Standard_EXPORT virtual void Build (const gp_Pnt2d& theMinPnt,
43                                       const gp_Pnt2d& theMaxPnt) Standard_OVERRIDE;
44
45   //! IMPORTANT: Scaling makes sense only for frustum built on a single point!
46   //!            Note that this method does not perform any checks on type of the frustum.
47   //! Returns a copy of the frustum resized according to the scale factor given
48   //! and transforms it using the matrix given.
49   //! There are no default parameters, but in case if:
50   //!    - transformation only is needed: @theScaleFactor must be initialized as any negative value;
51   //!    - scale only is needed: @theTrsf must be set to gp_Identity.
52   Standard_EXPORT virtual Handle(SelectMgr_BaseFrustum) ScaleAndTransform (const Standard_Integer theScaleFactor,
53                                                                            const gp_GTrsf& theTrsf) const Standard_OVERRIDE;
54
55
56   // SAT Tests for different objects
57
58   //! SAT intersection test between defined volume and given axis-aligned box
59   Standard_EXPORT virtual Standard_Boolean Overlaps (const SelectMgr_Vec3& theBoxMin,
60                                                      const SelectMgr_Vec3& theBoxMax,
61                                                      const SelectMgr_ViewClipRange& theClipRange,
62                                                      SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
63
64   //! Returns true if selecting volume is overlapped by axis-aligned bounding box
65   //! with minimum corner at point theMinPt and maximum at point theMaxPt
66   Standard_EXPORT virtual Standard_Boolean Overlaps (const SelectMgr_Vec3& theBoxMin,
67                                                      const SelectMgr_Vec3& theBoxMax,
68                                                      Standard_Boolean*     theInside) const Standard_OVERRIDE;
69
70   //! Intersection test between defined volume and given point
71   Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt,
72                                                      const SelectMgr_ViewClipRange& theClipRange,
73                                                      SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
74
75   //! Intersection test between defined volume and given point
76   Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt) const Standard_OVERRIDE;
77
78   //! SAT intersection test between defined volume and given ordered set of points,
79   //! representing line segments. The test may be considered of interior part or
80   //! boundary line defined by segments depending on given sensitivity type
81   Standard_EXPORT virtual Standard_Boolean Overlaps (const TColgp_Array1OfPnt& theArrayOfPnts,
82                                                      Select3D_TypeOfSensitivity theSensType,
83                                                      const SelectMgr_ViewClipRange& theClipRange,
84                                                      SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
85
86   //! Checks if line segment overlaps selecting frustum
87   Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt1,
88                                                      const gp_Pnt& thePnt2,
89                                                      const SelectMgr_ViewClipRange& theClipRange,
90                                                      SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
91
92   //! SAT intersection test between defined volume and given triangle. The test may
93   //! be considered of interior part or boundary line defined by triangle vertices
94   //! depending on given sensitivity type
95   Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt1,
96                                                      const gp_Pnt& thePnt2,
97                                                      const gp_Pnt& thePnt3,
98                                                      Select3D_TypeOfSensitivity theSensType,
99                                                      const SelectMgr_ViewClipRange& theClipRange,
100                                                      SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
101
102   //! Measures distance between 3d projection of user-picked
103   //! screen point and given point theCOG
104   Standard_EXPORT virtual Standard_Real DistToGeometryCenter (const gp_Pnt& theCOG) const Standard_OVERRIDE;
105
106   //! Calculates the point on a view ray that was detected during the run of selection algo by given depth
107   Standard_EXPORT virtual gp_Pnt DetectedPoint (const Standard_Real theDepth) const Standard_OVERRIDE;
108
109   //! A set of helper functions that return rectangular selecting frustum data
110   inline const gp_Pnt* GetVertices() const { return myVertices; }
111
112   //! Returns projection of 2d mouse picked point or projection
113   //! of center of 2d rectangle (for point and rectangular selection
114   //! correspondingly) onto near view frustum plane
115   inline const gp_Pnt& GetNearPnt() const { return myNearPickedPnt; }
116
117   //! Returns projection of 2d mouse picked point or projection
118   //! of center of 2d rectangle (for point and rectangular selection
119   //! correspondingly) onto far view frustum plane
120   inline const gp_Pnt& GetFarPnt() const { return myFarPickedPnt; }
121
122   //! Return view ray direction.
123   const gp_Dir& GetViewRayDirection() const { return myViewRayDir; }
124
125   //! Return mouse coordinates.
126   const gp_Pnt2d& GetMousePosition() const { return myMousePos; }
127
128   //! Stores plane equation coefficients (in the following form:
129   //! Ax + By + Cz + D = 0) to the given vector
130   Standard_EXPORT virtual void GetPlanes (NCollection_Vector<SelectMgr_Vec4>& thePlaneEquations) const Standard_OVERRIDE;
131
132 protected:
133
134   Standard_EXPORT void segmentSegmentDistance (const gp_Pnt& theSegPnt1,
135                                                const gp_Pnt& theSegPnt2,
136                                                SelectBasics_PickResult& thePickResult) const;
137
138   Standard_EXPORT bool segmentPlaneIntersection (const gp_Vec& thePlane,
139                                                  const gp_Pnt& thePntOnPlane,
140                                                  SelectBasics_PickResult& thePickResult) const;
141
142 private:
143
144   void cacheVertexProjections (SelectMgr_RectangularFrustum* theFrustum) const;
145
146 private:
147   enum { LeftTopNear, LeftTopFar,
148          LeftBottomNear, LeftBottomFar,
149          RightTopNear, RightTopFar,
150          RightBottomNear, RightBottomFar };
151
152 private:
153
154   gp_Pnt                  myNearPickedPnt;             //!< 3d projection of user-picked selection point onto near view plane
155   gp_Pnt                  myFarPickedPnt;              //!< 3d projection of user-picked selection point onto far view plane
156   gp_Dir                  myViewRayDir;
157   gp_Pnt2d                myMousePos;                  //!< Mouse coordinates
158   Standard_Real           myScale;                     //!< Scale factor of applied transformation, if there was any
159
160 };
161
162 #endif // _SelectMgr_RectangularFrustum_HeaderFile