CCylinder.cpp

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/* +---------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)               |
   |                          http://www.mrpt.org/                             |
   |                                                                           |
   | Copyright (c) 2005-2017, 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    |
   +---------------------------------------------------------------------------+ */
 
#include "opengl-precomp.h"  // Precompiled header
#include <mrpt/opengl/CCylinder.h>
#include <mrpt/math/geometry.h>
#include <mrpt/utils/CStream.h>
 
#include "opengl_internals.h"
 
using namespace mrpt;
using namespace mrpt::opengl;
using namespace mrpt::math;
using namespace mrpt::utils;
using namespace std;
 
IMPLEMENTS_SERIALIZABLE(CCylinder,CRenderizableDisplayList,mrpt::opengl)
 
CCylinderPtr CCylinder::Create(const float baseRadius,const float topRadius,const float height,const int slices,const int stacks)       
{
        return CCylinderPtr(new CCylinder(baseRadius,topRadius,height,slices,stacks));
}
/*---------------------------------------------------------------
                                                        render
  ---------------------------------------------------------------*/
void CCylinder::render_dl() const       {
#if MRPT_HAS_OPENGL_GLUT
        glEnable (GL_BLEND);
        checkOpenGLError();
    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
        checkOpenGLError();
        GLUquadricObj *obj=gluNewQuadric();
 
        // This is required to draw cylinders of negative height.
        const float absHeight = std::abs(mHeight);
        if (mHeight<0)
        {
                glPushMatrix();
                glTranslatef(0,0,mHeight);
        }
 
        gluCylinder(obj,mBaseRadius,mTopRadius,absHeight,mSlices,mStacks);
 
        if (mHeight<0)
                glPopMatrix();
 
        if (mHasBottomBase) gluDisk(obj,0,mBaseRadius,mSlices,1);
        if (mHasTopBase&&mTopRadius>0)  {
                glPushMatrix();
                glTranslatef(0,0,mHeight);
                gluDisk(obj,0,mTopRadius,mSlices,1);
                glPopMatrix();
        }
        gluDeleteQuadric(obj);
        glDisable(GL_BLEND);
 
#endif
}
 
/*---------------------------------------------------------------
   Implements the writing to a CStream capability of
     CSerializable objects
  ---------------------------------------------------------------*/
void CCylinder::writeToStream(mrpt::utils::CStream &out,int *version) const     {
        if (version) *version=0;
        else    {
                writeToStreamRender(out);
                //version 0
                out<<mBaseRadius<<mTopRadius<<mHeight<<mSlices<<mStacks<<mHasBottomBase<<mHasTopBase;
        }
}
 
/*---------------------------------------------------------------
        Implements the reading from a CStream capability of
                CSerializable objects
  ---------------------------------------------------------------*/
void CCylinder::readFromStream(mrpt::utils::CStream &in,int version)    {
        switch (version)        {
                case 0:
                        readFromStreamRender(in);
                        in>>mBaseRadius>>mTopRadius>>mHeight>>mSlices>>mStacks>>mHasBottomBase>>mHasTopBase;
                        break;
                default:
                        MRPT_THROW_UNKNOWN_SERIALIZATION_VERSION(version)
        };
        CRenderizableDisplayList::notifyChange();
}
 
bool solveEqn(double a,double b,double c,double &t)     {       //Actually, the b from the quadratic equation is the DOUBLE of this. But this way, operations are simpler.
        if (a<0)        {
                a=-a;
                b=-b;
                c=-c;
        }
        if (a>=mrpt::math::geometryEpsilon)     {
                double delta=square(b)-a*c;
                if (delta==0) return (t=-b/a)>=0;
                else if (delta>=0)      {
                        delta=sqrt(delta);
                        if (-b-delta>0) {
                                t=(-b-delta)/a;
                                return true;
                        }       else if (-b+delta>0)    {
                                t=(-b+delta)/a;
                                return true;
                        }       //else return false;    Both solutions are negative
                }       //else return false;    Both solutions are complex
        }       else if (abs(b)>=mrpt::math::geometryEpsilon)    {
                t=-c/(b+b);
                return t>=0;
        }       //else return false;    This actually isn't an equation
        return false;
}
 
bool CCylinder::traceRay(const mrpt::poses::CPose3D &o,double &dist) const      {
        TLine3D lin;
        createFromPoseX(o-this->m_pose,lin);
        lin.unitarize();        //By adding this line, distance from any point of the line to its base is exactly equal to the "t".
        if (abs(lin.director[2])<geometryEpsilon)       {
                if (!reachesHeight(lin.pBase.z)) return false;
                float r;
                return getRadius(static_cast<float>(lin.pBase.z),r)?solveEqn(square(lin.director[0])+square(lin.director[1]),lin.director[0]*lin.pBase.x+lin.director[1]*lin.pBase.y,square(lin.pBase.x)+square(lin.pBase.y)-square(r),dist):false;
        }
        bool fnd=false;
        double nDist,tZ0;
        if (mHasBottomBase&&(tZ0=-lin.pBase.z/lin.director[2])>0)       {
                nDist=sqrt(square(lin.pBase.x+tZ0*lin.director[0])+square(lin.pBase.y+tZ0*lin.director[1]));
                if (nDist<=mBaseRadius) {
                        fnd=true;
                        dist=tZ0;
                }
        }
        if (mHasTopBase)        {
                tZ0=(mHeight-lin.pBase.z)/lin.director[2];
                if (tZ0>0&&(!fnd||tZ0<dist))    {
                        nDist=sqrt(square(lin.pBase.x+tZ0*lin.director[0])+square(lin.pBase.y+tZ0*lin.director[1]));
                        if (nDist<=mTopRadius)  {
                                fnd=true;
                                dist=tZ0;
                        }
                }
        }
        if (mBaseRadius==mTopRadius)    {
                if (solveEqn(square(lin.director[0])+square(lin.director[1]),lin.director[0]*lin.pBase.x+lin.director[1]*lin.pBase.y,square(lin.pBase.x)+square(lin.pBase.y)-square(mBaseRadius),nDist)) if ((!fnd||nDist<dist)&&reachesHeight(lin.pBase.z+nDist*lin.director[2]))      {
                        dist=nDist;
                        fnd=true;
                }
        }       else    {
                double slope=(mTopRadius-mBaseRadius)/mHeight;
                if (solveEqn(square(lin.director[0])+square(lin.director[1])-square(lin.director[2]*slope),lin.pBase.x*lin.director[0]+lin.pBase.y*lin.director[1]-(mBaseRadius+slope*lin.pBase.z)*slope*lin.director[2],square(lin.pBase.x)+square(lin.pBase.y)-square(mBaseRadius+slope*lin.pBase.z),nDist)) if ((!fnd||nDist<dist)&&reachesHeight(lin.pBase.z+nDist*lin.director[2]))        {
                        dist=nDist;
                        fnd=true;
                }
        }
        return fnd;
}
 
 
 
void CCylinder::getBoundingBox(mrpt::math::TPoint3D &bb_min, mrpt::math::TPoint3D &bb_max) const
{
        bb_min.x = -std::max(mBaseRadius,mTopRadius);
        bb_min.y = bb_min.x;
        bb_min.z = 0;
 
        bb_max.x = std::max(mBaseRadius,mTopRadius);
        bb_max.y = bb_max.x;
        bb_max.z = mHeight;
 
        // Convert to coordinates of my parent:
        m_pose.composePoint(bb_min, bb_min);
        m_pose.composePoint(bb_max, bb_max);
}