geometric_shapes.cpp

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/** \author Jia Pan */


#include "fcl/shape/geometric_shapes.h"
#include "fcl/shape/geometric_shapes_utility.h"

namespace fcl
{

void Convex::fillEdges()
{
  int* points_in_poly = polygons;
  if(edges) delete [] edges;

  int num_edges_alloc = 0;
  for(int i = 0; i < num_planes; ++i)
  {
    num_edges_alloc += *points_in_poly;
    points_in_poly += (*points_in_poly + 1);
  }

  edges = new Edge[num_edges_alloc];

  points_in_poly = polygons;
  int* index = polygons + 1;
  num_edges = 0;
  Edge e;
  bool isinset;
  for(int i = 0; i < num_planes; ++i)
  {
    for(int j = 0; j < *points_in_poly; ++j)
    {
      e.first = std::min(index[j], index[(j+1)%*points_in_poly]);
      e.second = std::max(index[j], index[(j+1)%*points_in_poly]);
      isinset = false;
      for(int k = 0; k < num_edges; ++k)
      {
        if((edges[k].first == e.first) && (edges[k].second == e.second))
        {
          isinset = true;
          break;
        }
      }

      if(!isinset)
      {
        edges[num_edges].first = e.first;
        edges[num_edges].second = e.second;
        ++num_edges;
      }
    }

    points_in_poly += (*points_in_poly + 1);
    index = points_in_poly + 1;
  }

  if(num_edges < num_edges_alloc)
  {
    Edge* tmp = new Edge[num_edges];
    memcpy(tmp, edges, num_edges * sizeof(Edge));
    delete [] edges;
    edges = tmp;
  }
}

void Halfspace::unitNormalTest()
{
  FCL_REAL l = n.length();
  if(l > 0)
  {
    FCL_REAL inv_l = 1.0 / l;
    n *= inv_l;
    d *= inv_l;
  }
  else
  {
    n.setValue(1, 0, 0);
    d = 0;
  }  
}

void Plane::unitNormalTest()
{
  FCL_REAL l = n.length();
  if(l > 0)
  {
    FCL_REAL inv_l = 1.0 / l;
    n *= inv_l;
    d *= inv_l;
  }
  else
  {
    n.setValue(1, 0, 0);
    d = 0;
  }
}


void Box::computeLocalAABB()
{
  computeBV<AABB>(*this, Transform3f(), aabb_local);
  aabb_center = aabb_local.center();
  aabb_radius = (aabb_local.min_ - aabb_center).length();
}

void Sphere::computeLocalAABB()
{
  computeBV<AABB>(*this, Transform3f(), aabb_local);
  aabb_center = aabb_local.center();
  aabb_radius = radius;
}

void Capsule::computeLocalAABB()
{
  computeBV<AABB>(*this, Transform3f(), aabb_local);
  aabb_center = aabb_local.center();
  aabb_radius = (aabb_local.min_ - aabb_center).length();
}

void Cone::computeLocalAABB()
{
  computeBV<AABB>(*this, Transform3f(), aabb_local);
  aabb_center = aabb_local.center();
  aabb_radius = (aabb_local.min_ - aabb_center).length();
}

void Cylinder::computeLocalAABB()
{
  computeBV<AABB>(*this, Transform3f(), aabb_local);
  aabb_center = aabb_local.center();
  aabb_radius = (aabb_local.min_ - aabb_center).length();
}

void Convex::computeLocalAABB()
{
  computeBV<AABB>(*this, Transform3f(), aabb_local);
  aabb_center = aabb_local.center();
  aabb_radius = (aabb_local.min_ - aabb_center).length();
}

void Halfspace::computeLocalAABB()
{
  computeBV<AABB>(*this, Transform3f(), aabb_local);
  aabb_center = aabb_local.center();
  aabb_radius = (aabb_local.min_ - aabb_center).length();
}

void Plane::computeLocalAABB()
{
  computeBV<AABB>(*this, Transform3f(), aabb_local);
  aabb_center = aabb_local.center();
  aabb_radius = (aabb_local.min_ - aabb_center).length();
}

void Triangle2::computeLocalAABB()
{
  computeBV<AABB>(*this, Transform3f(), aabb_local);
  aabb_center = aabb_local.center();
  aabb_radius = (aabb_local.min_ - aabb_center).length();
}


}