C++ Face函數代碼示例

font_instance* font_factory::FaceFromStyle(SPStyle const *style)
{
    font_instance *font = NULL;

    g_assert(style);

    if (style) {

        //  First try to use the font specification if it is set
        if (style->font_specification.set
            && style->font_specification.value
            && *style->font_specification.value) {

            font = FaceFromFontSpecification(style->font_specification.value);
        }

        // If that failed, try using the CSS information in the style
        if (!font) {

            font = Face(style->font_family.value, font_style_to_pos(*style));

            // That was a hatchet job... so we need to check if this font exists!!
            Glib::ustring fontSpec = font_factory::Default()->ConstructFontSpecification(font);
            Glib::ustring newFontSpec = FontSpecificationBestMatch( fontSpec );
            if( fontSpec != newFontSpec ) {
                font->Unref();
                font = FaceFromFontSpecification( newFontSpec.c_str() );
            }
        }
    }

    return font;
}

SphereMesh::SphereMesh(const Vector& radius, int stacks, int slices) : Mesh(GL_TRIANGLE_STRIP, true)
{   
    for (int stackNumber = 0; stackNumber <= stacks; ++stackNumber)
    {
        for (int sliceNumber = 0; sliceNumber <= slices; ++sliceNumber)
        {
            float theta = stackNumber * M_PI / stacks;
            float phi = sliceNumber * 2 * M_PI / slices + M_PI_2;
            float sinTheta = std::sin(theta);
            float sinPhi = std::sin(phi);
            float cosTheta = std::cos(theta);
            float cosPhi = std::cos(phi);

            float s = static_cast<float>(sliceNumber)/static_cast<float>(slices);
            float t = 1.0f-static_cast<float>(stackNumber)/static_cast<float>(stacks);

            m_faces.push_back(Face(UV(s, t),
                                   Vector(cosPhi * sinTheta, sinPhi * sinTheta, cosTheta),
                                   radius * Vector(cosPhi * sinTheta, sinPhi * sinTheta, cosTheta))
                             );
        }
    }

    for (int stackNumber = 0; stackNumber < stacks; ++stackNumber)
    {
        for (int sliceNumber = 0; sliceNumber <= slices; ++sliceNumber)
        {
            m_indices.push_back( stackNumber*(slices+1) + sliceNumber);
            m_indices.push_back( (stackNumber+1)*(slices+1) + sliceNumber);
        }
    }

    init();
}

    void loadMeshObject(const std::string& filename, MeshObject& mo)
    {
        std::vector<tinyobj::shape_t> shapes;
        std::vector<tinyobj::material_t> materials;

        std::string err = tinyobj::LoadObj(shapes, materials, filename.c_str());

        if (!err.empty()) {
            std::cerr << err << std::endl;
            exit(1);
        }

        assert(shapes.size() == 1 ? true : ("obj should be only one shape" && false));

        tinyobj::mesh_t& mesh = shapes[0].mesh;
        assert((mesh.positions.size() % 3) == 0);
        assert((mesh.normals.size() % 3) == 0);
        assert((mesh.indices.size() % 3) == 0);

        VerticesArray& vts = mo.getVertices();
        NormalsArray& nls = mo.getNormals();
        FacesArray& fs = mo.getFaces();

        for (size_t v = 0; v < mesh.positions.size() / 3; v++) 
            vts.push_back(VertexType(mesh.positions[3*v+0], mesh.positions[3*v+1], mesh.positions[3*v+2]));

        for (size_t n = 0; n < mesh.normals.size() / 3; n++) 
            nls.push_back(NormalType(mesh.normals[3*n+0], mesh.normals[3*n+1], mesh.normals[3*n+2]));

        for (size_t f = 0; f < mesh.indices.size() / 3; f++) 
            fs.push_back(Face(mesh.indices[3*f+0], mesh.indices[3*f+1], mesh.indices[3*f+2]));
    }

	/**
	 *  @glsymbols
	 *  @glfunref{Get}
	 *  @gldefref{CULL_FACE_MODE}
	 */
	static Face CullFaceMode(void)
	{
		GLint result;
		OGLPLUS_GLFUNC(GetIntegerv)(GL_CULL_FACE_MODE, &result);
		OGLPLUS_VERIFY_SIMPLE(GetIntegerv);
		return Face(result);
	}

	/**
	 *  @glsymbols
	 *  @glfunref{Get}
	 *  @gldefref{CULL_FACE_MODE}
	 */
	static Face CullFaceMode(void)
	{
		GLint result;
		OGLPLUS_GLFUNC(GetIntegerv)(GL_CULL_FACE_MODE, &result);
		OGLPLUS_VERIFY(OGLPLUS_ERROR_INFO(GetIntegerv));
		return Face(result);
	}

void Tessellate(
	NodeVector & vecNodes,
	FaceVector & vecFaces
) {
	int nInitialNodeListSize = vecNodes.size();

	// Create centerpoint nodes
	for (int i = 0; i < vecFaces.size(); i++) {
		InsertQuadNodeCenter(
			vecNodes,
			vecNodes[vecFaces[i][0]],
			vecNodes[vecFaces[i][1]],
			vecNodes[vecFaces[i][2]],
			vecNodes[vecFaces[i][3]]);
	}

	// Construct tesselation
	SegmentMap mapSegment;
	ConstructSegmentMap(vecFaces, mapSegment, -1);

	vecFaces.clear();

	SegmentMapIterator iter = mapSegment.begin();
	for (; iter != mapSegment.end(); iter++) {
		Face faceNew = 
			Face(
				iter->first[1],
				nInitialNodeListSize + iter->second[0],
				iter->first[0],
				nInitialNodeListSize + iter->second[1]);

		vecFaces.push_back(faceNew);
	}
}

void TrianglePyramid::_init(){
    
    
    //0
    vecs.push_back(ofVec3f( 0, 1, 0));
    //1
    vecs.push_back(ofVec3f( -.5, 0, -.4));
    //2
    vecs.push_back(ofVec3f( .5, 0, -.4));
    //3
    vecs.push_back(ofVec3f( 0, 0, .6));
    
    //zero
    indices.push_back(Index<int>(0, 1, 2));
    //first
    indices.push_back(Index<int>(1, 3, 2));
    //second
    indices.push_back(Index<int>(0, 2, 3));
    //third
    indices.push_back(Index<int>(1, 0, 3));
    
    
    for (int i=0; i<indices.size(); ++i){
        // to do
        //cout << indices[i].elem0 << ", " << indices[i].elem1 << ", " << indices[i].elem2 << endl;
        faces.push_back( Face(&vecs[indices[i].elem0], &vecs[indices[i].elem1], &vecs[indices[i].elem2]) );
    }
    
	setScale(ofVec3f(100.0, 100.0, 100.0));
}

static CompiledMesh* generate_glyph(VertexBuffer * vertex_buffer, unsigned c)
{
    Mesh msh;

    const float SCALE = 0.365f;

    font_data::glyph_record const & r = font_data::glyph_records[c];

    for(unsigned i = 0; i<r.v_count; ++i)
    {
        float x = r.vertices[i*2+0] * SCALE;
        float y = r.vertices[i*2+1] * SCALE;
        msh.addVertex(Vector3(x,y,0));
    }

    for(unsigned i = 0; i<r.i_count/3; ++i)
    {
        unsigned i0 = r.indices[i*3+0];
        unsigned i1 = r.indices[i*3+1];
        unsigned i2 = r.indices[i*3+2];
        msh.addFace(Face(i0, i1, i2, Color(255, 0, 0, 255)));
    }

    return msh.insert(vertex_buffer, 0.0f);
}

void MeshDesc::load(Serializer& serializer)
{
   std::string tmpStr;

   serializer.loadString(m_name);
   m_isSkin = serializer.loadBool();

   unsigned int count = serializer.loadInt();
   for (unsigned int i = 0; i < count; ++i)
   {
      serializer.loadString(tmpStr);
      m_materials.push_back(tmpStr);
   }

   count = serializer.loadInt();
   for (unsigned int i = 0; i < count; ++i)
   {
      m_vertices.push_back(LitVertex());
      m_vertices.back().load(serializer);
   }

   count = serializer.loadInt();
   for (unsigned int i = 0; i < count; ++i)
   {
      m_faces.push_back(Face());
      m_faces.back().load(serializer);
   }

   count = serializer.loadInt();
   for (unsigned int i = 0; i < count; ++i)
   {
      BonesInfluenceDefinition& influencingBones = m_bonesInfluencingAttribute[i];

      unsigned int namesCount = serializer.loadInt();
      for (unsigned int j = 0; j < namesCount; ++j)
      {
         serializer.loadString(tmpStr);
         influencingBones.push_back(tmpStr);
      }
   }

   count = serializer.loadInt();
   for (unsigned int i = 0; i < count; ++i)
   {
      m_skinBones.push_back(SkinBoneDefinition());
      m_skinBones.back().load(serializer);
   }

   serializer.loadMatrix(m_localMtx);

   count = serializer.loadInt();
   for (unsigned int i = 0; i < count; ++i)
   {
      MeshDesc* newChild = new MeshDesc();
      m_children.push_back(newChild);
      newChild->load(serializer);
      newChild->m_parent = this;
   }
}

/*
  1.26 ClipEar implements the Clipping-Ear-Algorithm.
  It finds an "Ear" in this Face, clips it and returns it as separate face.
  Note that the original Face is modified by this method!
  It is mainly used to implement evaporisation of faces
 
*/
Face Face::ClipEar() {
    Face ret;

    if (v.size() <= 3) {
        // Nothing to do if this Face consists only of three points
        return Face(v);
    } else {
        Pt a, b, c;
        unsigned int n = v.size();

        // Go through the corner-points, which are sorted counter-clockwise
        for (unsigned int i = 0; i < n; i++) {
            // Take the next three points
            a = v[(i + 0) % n].s;
            b = v[(i + 1) % n].s;
            c = v[(i + 2) % n].s;
            if (Pt::sign(a, b, c) < 0) {
                // If the third point c is right of the segment (a b), then
                // the three points don't form an "Ear"
                continue;
            }

            // Otherwise check, if any point is inside the triangle (a b c)
            bool inside = false;
            for (unsigned int j = 0; j < (n - 3); j++) {
                Pt x = v[(i + j + 3) % n].s;
                inside = Pt::insideTriangle(a, b, c, x) &&
                        !(a == x) && !(b == x) && !(c == x);
                if (inside) {
                    // If a point inside was found, we haven't found an ear.
                    break;
                }
            }

            if (!inside) {
                // No point was inside, so build the Ear-Face in "ret",
                ret.AddSeg(v[i + 0]);
                ret.AddSeg(v[(i + 1)%n]);
                Seg nw(v[(i + 1)%n].e, v[i + 0].s);
                ret.AddSeg(nw);
                
                // remove the Face-Segment (a b),
                v.erase(v.begin() + i);
                
                // and finally replace the segment (b c) by (a c)
                v[i].s = nw.e;
                v[i].e = nw.s;
                hullSeg.valid = 0;

                return ret;
            }
        }
    }
    
    DEBUG(2, "No ear found on face " << ToString());
    // If we are here it means we haven't found an ear. This shouldn't happen.
    // One reason could be that the face wasn't valid in the first place.
    return ret;
}

		void pushface(const int &a, const int &b, const int &c) {
			nFace++;
			tmp[nFace] = Face(a, b, c);
			tmp[nFace].isOnConvex = true;
			whe[a][b] = nFace;
			whe[b][c] = nFace;
			whe[c][a] = nFace;
		}

font_instance *font_factory::FaceFromDescr(char const *family, char const *style)
{
    PangoFontDescription *temp_descr = pango_font_description_from_string(style);
    pango_font_description_set_family(temp_descr,family);
    font_instance *res = Face(temp_descr);
    pango_font_description_free(temp_descr);
    return res;
}

_JATTA_EXPORT Jatta::Assimp::Face* Jatta::Assimp::Mesh::GetFaces() const
{
    Face* faces = new Face[mesh->mNumFaces];
    for (unsigned int i = 0; i < mesh->mNumFaces; i++)
    {
        faces[i] = Face(&mesh->mFaces[i]);
    }

    return faces;
}

Face Traversor2VF<MAP>::begin()
{
	if(m_QLT != NULL)
	{
		m_ItDarts = m_QLT->begin();
		return Face(*m_ItDarts++);
	}

	current = start ;
	return current ;
}

void fillHoles(SurfaceMesh &mesh){
    std::vector<std::vector<SurfaceMesh::SimplexID<2>>> holeList;
    surfacemesh_detail::findHoles(mesh, holeList);

    for(auto& holeEdges : holeList){
        std::vector<SurfaceMesh::SimplexID<1>> sortedVertices;
        surfacemesh_detail::edgeRingToVertices(mesh, holeEdges, std::back_inserter(sortedVertices));

        surfacemesh_detail::triangulateHole(mesh, sortedVertices, Face(), holeEdges);
    }
}