Subversion Repositories gelsvn

#include <vector>
#include "CGLA/Mat3x3f.h"
#include "CGLA/Vec2f.h"
#include "Face.h"
#include "Manifold.h"
#include "FaceCirculator.h"

using namespace CGLA;
using namespace std;

namespace HMesh
{
        template<class R>
        Face_template<R>::Face_template(): 
                last(NULL_HALFEDGE_ITER),
                touched(0)
        {}

        FaceIter NULL_FACE_ITER(0);
        
        template class Face_template<Iters>;

        int no_edges(FaceIter f)
        {
                FaceCirculator fc(f);
                while(!fc.end()) ++fc;
                return fc.no_steps();
        }

        Vec3f get_normal(FaceIter f)
        {
                vector<Vec3f> v;
                FaceCirculator fc(f);
                int k;
                for(k=0;!fc.end();++fc,++k)
                        {
                                Vec3f p = fc.get_vertex()->get_pos();
                                v.push_back(p);
                        }
                Vec3f norm(0);
                for(int i=0;i<k;++i)
                        {
                                norm[0] += (v[i][1]-v[(i+1)%k][1])*(v[i][2]+v[(i+1)%k][2]);
                                norm[1] += (v[i][2]-v[(i+1)%k][2])*(v[i][0]+v[(i+1)%k][0]);
                                norm[2] += (v[i][0]-v[(i+1)%k][0])*(v[i][1]+v[(i+1)%k][1]);
                        }
                float l = norm.length();
                if(l>0.0f)
                        norm /= l;
                return norm;
        }

        float get_area(FaceIter f)
        {
                FaceCirculator fc(f);
                int k;

                // M is a matrix that projects a vector onto the orthogonal
                // complement of the face normal
                Mat3x3f M;
                Vec3f n = get_normal(f);
                outer_product(n,n,M);
                M = identity_Mat3x3f() - M;

                // Get all projected vertices
                vector<Vec2f> v;                
                for(k=0;!fc.end();++fc,++k)
                        {
                                Vec3f p = M * fc.get_vertex()->get_pos();
                                v.push_back(Vec2f(p[0], p[1]));
                        }
                float area = 0;
                for(int i=0;i<k;++i)
                        {
                                area += 0.5 * cross(v[i], v[(i+1)%k]);
                        }
                return fabs(area);
        }

        Vec3f get_centre(FaceIter f)
        {
                Vec3f c(0);
                FaceCirculator fc(f);
                while(!fc.end())
                        {
                                c += fc.get_vertex()->get_pos();
                                ++fc;
                        }
                c /= fc.no_steps();
                return c;
        }
        
}