CGeneralizedCylinder.h

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/* +---------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)               |
   |                          http://www.mrpt.org/                             |
   |                                                                           |
   | Copyright (c) 2005-2014, Individual contributors, see AUTHORS file        |
   | See: http://www.mrpt.org/Authors - All rights reserved.                   |
   | Released under BSD License. See details in http://www.mrpt.org/License    |
   +---------------------------------------------------------------------------+ */
#ifndef opengl_CGeneralizedCylinder_H
#define opengl_CGeneralizedCylinder_H

#include <mrpt/opengl/CRenderizableDisplayList.h>
#include <mrpt/opengl/CPolyhedron.h>
#include <mrpt/opengl/CSetOfTriangles.h>
#include <mrpt/math/geometry.h>
#include <mrpt/math/CMatrixTemplate.h>

namespace mrpt  {
namespace opengl        {
        using namespace std;
        using namespace mrpt::math;
        class OPENGL_IMPEXP CGeneralizedCylinder;
        // This must be added to any CSerializable derived class:
        DEFINE_SERIALIZABLE_PRE_CUSTOM_BASE_LINKAGE(CGeneralizedCylinder,CRenderizableDisplayList, OPENGL_IMPEXP)
        /**
          * This object represents any figure obtained by extruding any profile along a given axis. The profile should lie over a x=0 plane, and the axis must be roughly perpendicular to this plane. In particular, it should be almost perpendicular to the Z axis.
          * \ingroup mrpt_opengl_grp
          */
        class OPENGL_IMPEXP CGeneralizedCylinder:public CRenderizableDisplayList        {
                DEFINE_SERIALIZABLE(CGeneralizedCylinder)
        public:
                /**
                  * Auxiliary struct holding any quadrilateral, represented by foour points.
                  */
                struct OPENGL_IMPEXP TQuadrilateral     {
                private:
                        /**
                          * Automatically compute a vector normal to this quadrilateral.
                          */
                        void calculateNormal();
                public:
                        /**
                          * Quadrilateral`'s points.
                          */
                        TPoint3D points[4];
                        /**
                          * Normal vector.
                          */
                        double normal[3];
                        /**
                          * Given a polygon with 4 already positions allocated, this method fills it with the quadrilateral points.
                          * \sa mrpt::math::TPolygon3D
                          */
                        inline void getAsPolygonUnsafe(mrpt::math::TPolygon3D &vec) const       {
                                vec[0]=points[0];
                                vec[1]=points[1];
                                vec[2]=points[2];
                                vec[3]=points[3];
                        }
                        /**
                          * Constructor from 4 points.
                          */
                        TQuadrilateral(const TPoint3D &p1,const TPoint3D &p2,const TPoint3D &p3,const TPoint3D &p4)     {
                                points[0]=p1;
                                points[1]=p2;
                                points[2]=p3;
                                points[3]=p4;
                                calculateNormal();
                        }
                        /**
                          * Construction from any array of four compatible objects.
                          */
                        template<class T> TQuadrilateral(const T (&p)[4])       {
                                for (int i=0;i<4;i++) points[i]=p[i];
                                calculateNormal();
                        }
                        /**
                          * Empty constructor. Initializes to garbage.
                          */
                        TQuadrilateral()        {}
                        /**
                          * Destructor.
                          */
                        ~TQuadrilateral()       {}
                };
        protected:
                /**
                  * Cylinder's axis. It's represented as a pose because it holds the angle to get to the next pose.
                  */
                vector<CPose3D> axis;
                /**
                  * Object's generatrix, that is, profile which will be extruded.
                  */
                vector<TPoint3D> generatrix;
                /**
                  * Mutable object with mesh information, used to avoid repeated computations.
                  */
                mutable std::vector<TQuadrilateral> mesh;
                /**
                  * Mutable object with the cylinder's points, used to avoid repeated computations.
                  */
                mutable CMatrixTemplate<TPoint3D> pointsMesh;
                /**
                  * Mutable flag which tells if recalculations are needed.
                  */
                mutable bool meshUpToDate;
                /**
                  * Mutable set of data used in ray tracing.
                  * \sa mrpt::math::TPolygonWithPlane
                  */
                mutable vector<TPolygonWithPlane> polys;
                /**
                  * Mutable flag telling whether ray tracing temporary data must be recalculated or not.
                  */
                mutable bool polysUpToDate;
                /**
                  * Boolean variable which determines if the profile is closed at each section.
                  */
                bool closed;
                /**
                  * Flag to determine whether the object is fully visible or only some sections are.
                  */
                bool fullyVisible;
                /**
                  * First visible section, if fullyVisible is set to false.
                  * \sa fullyVisible,lastSection
                  */
                size_t firstSection;
                /**
                  * Last visible section, if fullyVisible is set to false.
                  * \sa fullyVisible,firstSection
                  */
                size_t lastSection;
        public:
                /**
                  * Creation of generalized cylinder from axis and generatrix
                  */
                static CGeneralizedCylinderPtr Create(const std::vector<TPoint3D> &axis,const std::vector<TPoint3D> &generatrix);
                /**
                  * Render.
                  * \sa mrpt::opengl::CRenderizable
                  */
                void render_dl() const;
                /**
                  * Ray tracing.
                  * \sa mrpt::opengl::CRenderizable.
                  */
                virtual bool traceRay(const mrpt::poses::CPose3D &o,double &dist) const;
                /**
                  * Get axis's spatial coordinates.
                  */
                inline void getAxis(std::vector<TPoint3D> &a) const     {
                        //a=axis;
                        size_t N=axis.size();
                        a.resize(N);
                        for (size_t i=0;i<N;i++)        {
                                a[i].x=axis[i].x();
                                a[i].y=axis[i].y();
                                a[i].z=axis[i].z();
                        }
                }
                /**
                  * Get axis, including angular coordinates.
                  */
                inline void getAxis(std::vector<CPose3D> &a) const      {
                        a=axis;
                }
                /**
                  * Set the axis points.
                  */
                inline void setAxis(const std::vector<TPoint3D> &a)     {
                        generatePoses(a,axis);
                        meshUpToDate=false;
                        fullyVisible=true;
                        CRenderizableDisplayList::notifyChange();
                }
                /**
                  * Get cylinder's profile.
                  */
                inline void getGeneratrix(std::vector<TPoint3D> &g) const       {
                        g=generatrix;
                }
                /**
                  * Set cylinder's profile.
                  */
                inline void setGeneratrix(const std::vector<TPoint3D> &g)       {
                        generatrix=g;
                        meshUpToDate=false;
                        CRenderizableDisplayList::notifyChange();
                }
                /**
                  * Returns true if each section is a closed polygon.
                  */
                inline bool isClosed() const    {
                        return closed;
                }
                /**
                  * Set whether each section is a closed polygon or not.
                  */
                inline void setClosed(bool c=true)      {
                        closed=c;
                        meshUpToDate=false;
                        CRenderizableDisplayList::notifyChange();
                }
                /**
                  * Get a polyhedron containing the starting point of the cylinder (its "base").
                  * \sa getEnd,mrpt::opengl::CPolyhedron
                  */
                void getOrigin(CPolyhedronPtr &poly) const;
                /**
                  * Get a polyhedron containing the ending point of the cylinder (its "base").
                  * \sa getOrigin,mrpt::opengl::CPolyhedron
                  */
                void getEnd(CPolyhedronPtr &poly) const;
                /**
                  * Get the cylinder as a set of polygons in 3D.
                  * \sa mrpt::math::TPolygon3D
                  */
                void generateSetOfPolygons(std::vector<TPolygon3D> &res) const;
                /**
                  * Get a polyhedron consisting of a set of closed sections of the cylinder.
                  * \sa mrpt::opengl::CPolyhedron
                  */
                void getClosedSection(size_t index1,size_t index2,CPolyhedronPtr &poly) const;
                /**
                  * Get a polyhedron consisting of a single section of the cylinder.
                  * \sa mrpt::opengl::CPolyhedron
                  */
                inline void getClosedSection(size_t index,CPolyhedronPtr &poly) const   {
                        getClosedSection(index,index,poly);
                }
                /**
                  * Get the number of sections in this cylinder.
                  */
                inline size_t getNumberOfSections() const       {
                        return axis.size()?(axis.size()-1):0;
                }
                /**
                  * Get how many visible sections are in the cylinder.
                  */
                inline size_t getVisibleSections() const        {
                        return fullyVisible?getNumberOfSections():(lastSection-firstSection);
                }
                /**
                  * Gets the cylinder's visible sections.
                  */
                void getVisibleSections(size_t &first,size_t &last) const       {
                        if (fullyVisible)       {
                                first=0;
                                last=getNumberOfSections();
                        }       else    {
                                first=firstSection;
                                last=lastSection;
                        }
                }
                /**
                  * Sets all sections visible.
                  */
                inline void setAllSectionsVisible()     {
                        fullyVisible=true;
                        CRenderizableDisplayList::notifyChange();
                }
                /**
                  * Hides all sections.
                  */
                inline void setAllSectionsInvisible(size_t pointer=0)   {
                        fullyVisible=false;
                        firstSection=pointer;
                        lastSection=pointer;
                        CRenderizableDisplayList::notifyChange();
                }
                /**
                  * Sets which sections are visible.
                  * \throw std::logic_error on wrongly defined bounds.
                  */
                inline void setVisibleSections(size_t first,size_t last)        {
                        fullyVisible=false;
                        if (first>last||last>getNumberOfSections()) throw std::logic_error("Wrong bound definition");
                        firstSection=first;
                        lastSection=last;
                        CRenderizableDisplayList::notifyChange();
                }
                /**
                  * Adds another visible section at the start of the cylinder. The cylinder must have an invisble section to display.
                  * \throw std::logic_error if there is no section to add to the displaying set.
                  * \sa addVisibleSectionAtEnd,removeVisibleSectionAtStart,removeVisibleSectionAtEnd
                  */
                inline void addVisibleSectionAtStart()  {
                        if (fullyVisible||firstSection==0) throw std::logic_error("No more sections");
                        firstSection--;
                        CRenderizableDisplayList::notifyChange();
                }
                /**
                  * Adds another visible section at the end of the cylinder. The cylinder must have an invisible section to display.
                  * \throw std::logic_error if there is no section to add to the displaying set.
                  * \sa addVisibleSectionAtStart,removeVisibleSectionAtStart,removeVisibleSectionAtEnd
                  */
                inline void addVisibleSectionAtEnd()    {
                        if (fullyVisible||lastSection==getNumberOfSections()) throw std::logic_error("No more sections");
                        lastSection++;
                        CRenderizableDisplayList::notifyChange();
                }
                /**
                  * Removes a visible section from the start of the currently visible set.
                  * \throw std::logic_error if there are no visible sections.
                  * \sa addVisibleSectionAtStart,addVisibleSectionAtEnd,removeVisibleSectionAtEnd
                  */
                void removeVisibleSectionAtStart();
                /**
                  * Removes a visible section from the ending of the currently visible set.
                  * \throw std::logic_error when there is no such section.
                  * \sa addVisibleSectionAtStart,addVisibleSectionAtEnd,removeVisibleSectionAtStart
                  */
                void removeVisibleSectionAtEnd();
                /**
                  * Gets the axis pose of the first section, returning false if there is no such pose.
                  */
                bool getFirstSectionPose(mrpt::poses::CPose3D &p);
                /**
                  * Gets the axis pose of the last section, returning false if there is no such pose.
                  */
                bool getLastSectionPose(mrpt::poses::CPose3D &p);
                /**
                  * Gets the axis pose of the first visible section, returning false if there is no such pose.
                  */
                bool getFirstVisibleSectionPose(mrpt::poses::CPose3D &p);
                /**
                  * Gets the axis pose of the last section, returning false if there is no such pose.
                  */
                bool getLastVisibleSectionPose(mrpt::poses::CPose3D &p);
                /**
                  * Updates the mutable set of polygons used in ray tracing.
                  */
                void updatePolys() const;

                /** Evaluates the bounding box of this object (including possible children) in the coordinate frame of the object parent. */
                virtual void getBoundingBox(mrpt::math::TPoint3D &bb_min, mrpt::math::TPoint3D &bb_max) const;

        private:
                /**
                  * Updates the axis, transforming each point into a pose pointing to the next section.
                  */
                void generatePoses(const std::vector<TPoint3D> &pIn,std::vector<CPose3D> &pOut);
                /**
                  * Updates the mutable mesh.
                  */
                void updateMesh() const;
                /**
                  * Given a vector of polyhedrons, gets the starting and ending iterators to the section to be actually rendered.
                  */
                void getMeshIterators(const vector<TQuadrilateral> &m,vector<TQuadrilateral>::const_iterator &begin,vector<TQuadrilateral>::const_iterator &end) const;
                /**
                  * Basic constructor with default initialization.
                  */
                CGeneralizedCylinder():axis(),generatrix(),mesh(),meshUpToDate(false),polysUpToDate(false),closed(false),fullyVisible(true)     {}
                /**
                  * Constructor with axis and generatrix.
                  */
                CGeneralizedCylinder(const std::vector<TPoint3D> &a,const std::vector<TPoint3D> &g):generatrix(g),mesh(),meshUpToDate(false),polysUpToDate(false),closed(false),fullyVisible(true)      {
                        generatePoses(a,axis);
                }
                /**
                  * Destructor.
                  */
                virtual ~CGeneralizedCylinder() {};
        };
        DEFINE_SERIALIZABLE_POST_CUSTOM_BASE_LINKAGE(CGeneralizedCylinder,CRenderizableDisplayList, OPENGL_IMPEXP)
}
}
#endif