// Created on: 2014-05-22 // Created by: Varvara POSKONINA // Copyright (c) 2005-2014 OPEN CASCADE SAS // // This file is part of Open CASCADE Technology software library. // // This library is free software; you can redistribute it and/or modify it under // the terms of the GNU Lesser General Public License version 2.1 as published // by the Free Software Foundation, with special exception defined in the file // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT // distribution for complete text of the license and disclaimer of any warranty. // // Alternatively, this file may be used under the terms of Open CASCADE // commercial license or contractual agreement. #ifndef _SelectMgr_RectangularFrustum_HeaderFile #define _SelectMgr_RectangularFrustum_HeaderFile #include #include //! This class contains representation of rectangular selecting frustum, created in case //! of point and box selection, and algorithms for overlap detection between selecting //! frustum and sensitive entities. The principle of frustum calculation: //! - for point selection: on a near view frustum plane rectangular neighborhood of //! user-picked point is created according to the pixel tolerance //! given and then this rectangle is projected onto far view frustum //! plane. This rectangles define the parallel bases of selecting frustum; //! - for box selection: box points are projected onto near and far view frustum planes. //! These 2 projected rectangles define parallel bases of selecting frustum. //! Overlap detection tests are implemented according to the terms of separating axis //! theorem (SAT). class SelectMgr_RectangularFrustum : public SelectMgr_Frustum<4> { public: SelectMgr_RectangularFrustum() : myScale (1.0) {}; //! Builds volume according to the point and given pixel tolerance Standard_EXPORT virtual void Build (const gp_Pnt2d& thePoint) Standard_OVERRIDE; //! Builds volume according to the selected rectangle Standard_EXPORT virtual void Build (const gp_Pnt2d& theMinPnt, const gp_Pnt2d& theMaxPnt) Standard_OVERRIDE; //! IMPORTANT: Scaling makes sense only for frustum built on a single point! //! Note that this method does not perform any checks on type of the frustum. //! Returns a copy of the frustum resized according to the scale factor given //! and transforms it using the matrix given. //! There are no default parameters, but in case if: //! - transformation only is needed: @theScaleFactor must be initialized as any negative value; //! - scale only is needed: @theTrsf must be set to gp_Identity. Standard_EXPORT virtual Handle(SelectMgr_BaseFrustum) ScaleAndTransform (const Standard_Integer theScaleFactor, const gp_GTrsf& theTrsf) const Standard_OVERRIDE; // SAT Tests for different objects //! SAT intersection test between defined volume and given axis-aligned box Standard_EXPORT virtual Standard_Boolean Overlaps (const SelectMgr_Vec3& theBoxMin, const SelectMgr_Vec3& theBoxMax, Standard_Real& theDepth) Standard_OVERRIDE; //! Returns true if selecting volume is overlapped by axis-aligned bounding box //! with minimum corner at point theMinPt and maximum at point theMaxPt Standard_EXPORT virtual Standard_Boolean Overlaps (const SelectMgr_Vec3& theBoxMin, const SelectMgr_Vec3& theBoxMax, Standard_Boolean* theInside = NULL) Standard_OVERRIDE; //! Intersection test between defined volume and given point Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt, Standard_Real& theDepth) Standard_OVERRIDE; //! Intersection test between defined volume and given point Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt) Standard_OVERRIDE; //! SAT intersection test between defined volume and given ordered set of points, //! representing line segments. The test may be considered of interior part or //! boundary line defined by segments depending on given sensitivity type Standard_EXPORT virtual Standard_Boolean Overlaps (const TColgp_Array1OfPnt& theArrayOfPnts, Select3D_TypeOfSensitivity theSensType, Standard_Real& theDepth) Standard_OVERRIDE; //! Checks if line segment overlaps selecting frustum Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt1, const gp_Pnt& thePnt2, Standard_Real& theDepth) Standard_OVERRIDE; //! SAT intersection test between defined volume and given triangle. The test may //! be considered of interior part or boundary line defined by triangle vertices //! depending on given sensitivity type Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt1, const gp_Pnt& thePnt2, const gp_Pnt& thePnt3, Select3D_TypeOfSensitivity theSensType, Standard_Real& theDepth) Standard_OVERRIDE; //! Measures distance between 3d projection of user-picked //! screen point and given point theCOG Standard_EXPORT virtual Standard_Real DistToGeometryCenter (const gp_Pnt& theCOG) Standard_OVERRIDE; //! Calculates the point on a view ray that was detected during the run of selection algo by given depth Standard_EXPORT virtual gp_Pnt DetectedPoint (const Standard_Real theDepth) const Standard_OVERRIDE; //! Checks if the point of sensitive in which selection was detected belongs //! to the region defined by clipping planes Standard_EXPORT virtual Standard_Boolean IsClipped (const Graphic3d_SequenceOfHClipPlane& thePlanes, const Standard_Real theDepth) Standard_OVERRIDE; //! Valid for point selection only! //! Computes depth range for global (defined for the whole view) clipping planes. Standard_EXPORT virtual void SetViewClipping (const Graphic3d_SequenceOfHClipPlane& thePlanes) Standard_OVERRIDE; //! A set of helper functions that return rectangular selecting frustum data inline const gp_Pnt* GetVertices() const { return myVertices; } //! Returns projection of 2d mouse picked point or projection //! of center of 2d rectangle (for point and rectangular selection //! correspondingly) onto near view frustum plane inline const gp_Pnt& GetNearPnt() const { return myNearPickedPnt; } //! Returns projection of 2d mouse picked point or projection //! of center of 2d rectangle (for point and rectangular selection //! correspondingly) onto far view frustum plane inline const gp_Pnt& GetFarPnt() const { return myFarPickedPnt; } protected: Standard_EXPORT void segmentSegmentDistance (const gp_Pnt& theSegPnt1, const gp_Pnt& theSegPnt2, Standard_Real& theDepth); Standard_EXPORT void segmentPlaneIntersection (const gp_Vec& thePlane, const gp_Pnt& thePntOnPlane, Standard_Real& theDepth); //! Computes valid depth range for the given clipping planes Standard_EXPORT void computeClippingRange (const Graphic3d_SequenceOfHClipPlane& thePlanes, Standard_Real& theDepthMin, Standard_Real& theDepthMax); //! Returns false if theDepth must be clipped by current view clip range Standard_EXPORT Standard_Boolean isViewClippingOk (const Standard_Real theDepth) const; private: void cacheVertexProjections (SelectMgr_RectangularFrustum* theFrustum) const; private: enum { LeftTopNear, LeftTopFar, LeftBottomNear, LeftBottomFar, RightTopNear, RightTopFar, RightBottomNear, RightBottomFar }; private: gp_Pnt myNearPickedPnt; //!< 3d projection of user-picked selection point onto near view plane gp_Pnt myFarPickedPnt; //!< 3d projection of user-picked selection point onto far view plane gp_Vec myViewRayDir; gp_Pnt2d myMousePos; //!< Mouse coordinates Standard_Real myScale; //!< Scale factor of applied transformation, if there was any SelectMgr_ViewClipRange myViewClipRange; }; #endif // _SelectMgr_RectangularFrustum_HeaderFile