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871dcdc201
- getter for selection frustum computed during last run of selection mechanism was added to SelectMgr_SelectingVolumeManager; - getters for frustum planes were added to SelectMgr_BaseFrustum and its successors; - an API for applications to get frustum planes was added to SelectBasics_SelectingVolumeManager.
181 lines
9.6 KiB
C++
181 lines
9.6 KiB
C++
// Created on: 2014-05-22
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// Created by: Varvara POSKONINA
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// Copyright (c) 2005-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _SelectMgr_RectangularFrustum_HeaderFile
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#define _SelectMgr_RectangularFrustum_HeaderFile
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#include <SelectMgr_Frustum.hxx>
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#include <SelectMgr_ViewClipRange.hxx>
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//! This class contains representation of rectangular selecting frustum, created in case
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//! of point and box selection, and algorithms for overlap detection between selecting
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//! frustum and sensitive entities. The principle of frustum calculation:
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//! - for point selection: on a near view frustum plane rectangular neighborhood of
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//! user-picked point is created according to the pixel tolerance
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//! given and then this rectangle is projected onto far view frustum
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//! plane. This rectangles define the parallel bases of selecting frustum;
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//! - for box selection: box points are projected onto near and far view frustum planes.
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//! These 2 projected rectangles define parallel bases of selecting frustum.
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//! Overlap detection tests are implemented according to the terms of separating axis
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//! theorem (SAT).
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class SelectMgr_RectangularFrustum : public SelectMgr_Frustum<4>
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{
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public:
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SelectMgr_RectangularFrustum() : myScale (1.0), myIsViewClipEnabled (Standard_True) {};
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//! Builds volume according to the point and given pixel tolerance
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Standard_EXPORT virtual void Build (const gp_Pnt2d& thePoint) Standard_OVERRIDE;
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//! Builds volume according to the selected rectangle
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Standard_EXPORT virtual void Build (const gp_Pnt2d& theMinPnt,
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const gp_Pnt2d& theMaxPnt) Standard_OVERRIDE;
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//! IMPORTANT: Scaling makes sense only for frustum built on a single point!
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//! Note that this method does not perform any checks on type of the frustum.
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//! Returns a copy of the frustum resized according to the scale factor given
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//! and transforms it using the matrix given.
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//! There are no default parameters, but in case if:
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//! - transformation only is needed: @theScaleFactor must be initialized as any negative value;
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//! - scale only is needed: @theTrsf must be set to gp_Identity.
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Standard_EXPORT virtual Handle(SelectMgr_BaseFrustum) ScaleAndTransform (const Standard_Integer theScaleFactor,
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const gp_GTrsf& theTrsf) const Standard_OVERRIDE;
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// SAT Tests for different objects
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//! SAT intersection test between defined volume and given axis-aligned box
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Standard_EXPORT virtual Standard_Boolean Overlaps (const SelectMgr_Vec3& theBoxMin,
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const SelectMgr_Vec3& theBoxMax,
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Standard_Real& theDepth) Standard_OVERRIDE;
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//! Returns true if selecting volume is overlapped by axis-aligned bounding box
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//! with minimum corner at point theMinPt and maximum at point theMaxPt
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Standard_EXPORT virtual Standard_Boolean Overlaps (const SelectMgr_Vec3& theBoxMin,
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const SelectMgr_Vec3& theBoxMax,
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Standard_Boolean* theInside = NULL) Standard_OVERRIDE;
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//! Intersection test between defined volume and given point
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Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt,
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Standard_Real& theDepth) Standard_OVERRIDE;
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//! Intersection test between defined volume and given point
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Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt) Standard_OVERRIDE;
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//! SAT intersection test between defined volume and given ordered set of points,
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//! representing line segments. The test may be considered of interior part or
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//! boundary line defined by segments depending on given sensitivity type
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Standard_EXPORT virtual Standard_Boolean Overlaps (const TColgp_Array1OfPnt& theArrayOfPnts,
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Select3D_TypeOfSensitivity theSensType,
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Standard_Real& theDepth) Standard_OVERRIDE;
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//! Checks if line segment overlaps selecting frustum
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Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt1,
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const gp_Pnt& thePnt2,
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Standard_Real& theDepth) Standard_OVERRIDE;
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//! SAT intersection test between defined volume and given triangle. The test may
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//! be considered of interior part or boundary line defined by triangle vertices
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//! depending on given sensitivity type
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Standard_EXPORT virtual Standard_Boolean Overlaps (const gp_Pnt& thePnt1,
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const gp_Pnt& thePnt2,
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const gp_Pnt& thePnt3,
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Select3D_TypeOfSensitivity theSensType,
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Standard_Real& theDepth) Standard_OVERRIDE;
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//! Measures distance between 3d projection of user-picked
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//! screen point and given point theCOG
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Standard_EXPORT virtual Standard_Real DistToGeometryCenter (const gp_Pnt& theCOG) Standard_OVERRIDE;
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//! Calculates the point on a view ray that was detected during the run of selection algo by given depth
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Standard_EXPORT virtual gp_Pnt DetectedPoint (const Standard_Real theDepth) const Standard_OVERRIDE;
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//! Checks if the point of sensitive in which selection was detected belongs
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//! to the region defined by clipping planes
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Standard_EXPORT virtual Standard_Boolean IsClipped (const Graphic3d_SequenceOfHClipPlane& thePlanes,
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const Standard_Real theDepth) Standard_OVERRIDE;
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//! Valid for point selection only!
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//! Computes depth range for global (defined for the whole view) clipping planes.
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Standard_EXPORT virtual void SetViewClipping (const Handle(Graphic3d_SequenceOfHClipPlane)& thePlanes) Standard_OVERRIDE;
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//! Set if view clipping plane is enabled or not.
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//! @return previous value of the flag
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virtual Standard_Boolean SetViewClippingEnabled (const Standard_Boolean theToEnable) Standard_OVERRIDE
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{
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Standard_Boolean aPrevValue = myIsViewClipEnabled;
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myIsViewClipEnabled = theToEnable;
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return aPrevValue;
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}
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//! A set of helper functions that return rectangular selecting frustum data
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inline const gp_Pnt* GetVertices() const { return myVertices; }
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//! Returns projection of 2d mouse picked point or projection
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//! of center of 2d rectangle (for point and rectangular selection
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//! correspondingly) onto near view frustum plane
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inline const gp_Pnt& GetNearPnt() const { return myNearPickedPnt; }
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//! Returns projection of 2d mouse picked point or projection
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//! of center of 2d rectangle (for point and rectangular selection
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//! correspondingly) onto far view frustum plane
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inline const gp_Pnt& GetFarPnt() const { return myFarPickedPnt; }
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//! Stores plane equation coefficients (in the following form:
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//! Ax + By + Cz + D = 0) to the given vector
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Standard_EXPORT virtual void GetPlanes (NCollection_Vector<SelectMgr_Vec4>& thePlaneEquations) const Standard_OVERRIDE;
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protected:
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Standard_EXPORT void segmentSegmentDistance (const gp_Pnt& theSegPnt1,
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const gp_Pnt& theSegPnt2,
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Standard_Real& theDepth);
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Standard_EXPORT void segmentPlaneIntersection (const gp_Vec& thePlane,
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const gp_Pnt& thePntOnPlane,
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Standard_Real& theDepth);
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//! Computes valid depth range for the given clipping planes
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Standard_EXPORT void computeClippingRange (const Graphic3d_SequenceOfHClipPlane& thePlanes,
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Standard_Real& theDepthMin,
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Standard_Real& theDepthMax);
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//! Returns false if theDepth must be clipped by current view clip range
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Standard_EXPORT Standard_Boolean isViewClippingOk (const Standard_Real theDepth) const;
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private:
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void cacheVertexProjections (SelectMgr_RectangularFrustum* theFrustum) const;
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private:
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enum { LeftTopNear, LeftTopFar,
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LeftBottomNear, LeftBottomFar,
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RightTopNear, RightTopFar,
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RightBottomNear, RightBottomFar };
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private:
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gp_Pnt myNearPickedPnt; //!< 3d projection of user-picked selection point onto near view plane
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gp_Pnt myFarPickedPnt; //!< 3d projection of user-picked selection point onto far view plane
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gp_Vec myViewRayDir;
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gp_Pnt2d myMousePos; //!< Mouse coordinates
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Standard_Real myScale; //!< Scale factor of applied transformation, if there was any
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SelectMgr_ViewClipRange myViewClipRange;
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Standard_Boolean myIsViewClipEnabled; //!< view clipping enabled state
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};
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#endif // _SelectMgr_RectangularFrustum_HeaderFile
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