adding cw and ccw circulators

closes #2406

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@1227 fdac6126-5c0c-442c-9429-916003d36597

src/Unittests/unittests_trimesh_circulator_face_edge.cc

@@ -2,6 +2,7 @@
 #include <Unittests/unittests_common.hh>
 
 #include <iostream>
+#include <algorithm>
 
 namespace {
 
@@ -129,6 +130,145 @@ TEST_F(OpenMeshTrimeshCirculatorFaceEdge, FaceEdgeIterWithoutHolesIncrement) {
 }
 }
 
+/*
+ * test CW and CCW iterators
+ */
+TEST_F(OpenMeshTrimeshCirculatorFaceEdge, CWAndCCWTest) {
+
+  mesh_.clear();
+
+  // Add some vertices
+  Mesh::VertexHandle vhandle[6];
+
+  vhandle[0] = mesh_.add_vertex(Mesh::Point(0, 1, 0));
+  vhandle[1] = mesh_.add_vertex(Mesh::Point(1, 0, 0));
+  vhandle[2] = mesh_.add_vertex(Mesh::Point(2, 1, 0));
+  vhandle[3] = mesh_.add_vertex(Mesh::Point(3, 0, 0));
+  vhandle[4] = mesh_.add_vertex(Mesh::Point(4, 1, 0));
+  vhandle[5] = mesh_.add_vertex(Mesh::Point(2,-1, 0));
+
+  // Add three faces
+  std::vector<Mesh::VertexHandle> face_vhandles;
+
+  face_vhandles.push_back(vhandle[0]);
+  face_vhandles.push_back(vhandle[1]);
+  face_vhandles.push_back(vhandle[2]);
+  mesh_.add_face(face_vhandles);
+
+  face_vhandles.clear();
+
+  face_vhandles.push_back(vhandle[2]);
+  face_vhandles.push_back(vhandle[1]);
+  face_vhandles.push_back(vhandle[3]);
+  mesh_.add_face(face_vhandles);
+
+  face_vhandles.clear();
+
+  face_vhandles.push_back(vhandle[2]);
+  face_vhandles.push_back(vhandle[3]);
+  face_vhandles.push_back(vhandle[4]);
+  mesh_.add_face(face_vhandles);
+
+  face_vhandles.clear();
+
+  face_vhandles.push_back(vhandle[1]);
+  face_vhandles.push_back(vhandle[5]);
+  face_vhandles.push_back(vhandle[3]);
+  mesh_.add_face(face_vhandles);
+
+  /* Test setup:
+   *
+   * 0 ------ 2 ------ 4
+   *  \      / \      /
+   *   \  0 /   \  2 /
+   *    \  /  1  \  /
+   *     1 ------- 3
+   *      \       /
+   *       \  3  /
+   *        \   /
+   *         \ /
+   *          5
+   */
+
+
+  int indices[4] = {4, 1, 3, 4};
+  int rev_indices[4];
+  std::reverse_copy(indices,indices+4,rev_indices);
+
+  //CCW
+  Mesh::FaceEdgeCCWIter fe_ccwit  = mesh_.fe_ccwbegin(mesh_.face_handle(1));
+  Mesh::FaceEdgeCCWIter fe_ccwend = mesh_.fe_ccwend(mesh_.face_handle(1));
+  size_t i = 0;
+  for (;fe_ccwit != fe_ccwend; ++fe_ccwit, ++i)
+  {
+    EXPECT_EQ(indices[i], fe_ccwit->idx()) << "Index wrong in FaceEdgeCCWIter";
+  }
+
+  EXPECT_FALSE(fe_ccwit.is_valid()) << "Iterator invalid in FaceEdgeCCWIter at end";
+  EXPECT_TRUE( fe_ccwit == fe_ccwend )  << "End iterator for FaceEdgeCCWIter not matching";
+
+  //constant CCW
+  Mesh::ConstFaceEdgeCCWIter cfe_ccwit  = mesh_.cfe_ccwbegin(mesh_.face_handle(1));
+  Mesh::ConstFaceEdgeCCWIter cfe_ccwend = mesh_.cfe_ccwend(mesh_.face_handle(1));
+  i = 0;
+  for (;cfe_ccwit != cfe_ccwend; ++cfe_ccwit, ++i)
+  {
+    EXPECT_EQ(indices[i], cfe_ccwit->idx()) << "Index wrong in ConstFaceEdgeCCWIter";
+  }
+
+  EXPECT_FALSE(cfe_ccwit.is_valid()) << "Iterator invalid in ConstFaceEdgeCCWIter at end";
+  EXPECT_TRUE( cfe_ccwit == cfe_ccwend )  << "End iterator for ConstFaceEdgeCCWIter not matching";
+
+  //CW
+  Mesh::FaceEdgeCWIter fe_cwit  = mesh_.fe_cwbegin(mesh_.face_handle(1));
+  Mesh::FaceEdgeCWIter fe_cwend = mesh_.fe_cwend(mesh_.face_handle(1));
+  i = 0;
+  for (;fe_cwit != fe_cwend; ++fe_cwit, ++i)
+  {
+    EXPECT_EQ(rev_indices[i], fe_cwit->idx()) << "Index wrong in FaceEdgeCWIter";
+  }
+  EXPECT_FALSE(fe_cwit.is_valid()) << "Iterator invalid in FaceEdgeCWIter at end";
+  EXPECT_TRUE( fe_cwit == fe_cwend )  << "End iterator for FaceEdgeCWIter not matching";
+
+  //constant CW
+  Mesh::ConstFaceEdgeCWIter cfe_cwit  = mesh_.cfe_cwbegin(mesh_.face_handle(1));
+  Mesh::ConstFaceEdgeCWIter cfe_cwend = mesh_.cfe_cwend(mesh_.face_handle(1));
+  i = 0;
+  for (;cfe_cwit != cfe_cwend; ++cfe_cwit, ++i)
+  {
+    EXPECT_EQ(rev_indices[i], cfe_cwit->idx()) << "Index wrong in ConstFaceEdgeCWIter";
+  }
+  EXPECT_FALSE(cfe_cwit.is_valid()) << "Iterator invalid in ConstFaceEdgeCWIter at end";
+  EXPECT_TRUE( cfe_cwit == cfe_cwend )  << "End iterator for ConstFaceEdgeCWIter not matching";
+
+  /*
+   * conversion properties:
+   * a) cw_begin == CWIter(ccw_begin())
+   * b) cw_iter->idx() == CCWIter(cw_iter)->idx() for valid iterators
+   * c) --cw_iter == CWIter(++ccwIter) for valid iterators
+   * d) cw_end == CWIter(ccw_end()) => --cw_end != CWIter(++ccw_end())   *
+   */
+  Mesh::FaceEdgeCWIter fe_cwIter = mesh_.fe_cwbegin(mesh_.face_handle(1));
+  // a)
+  EXPECT_TRUE( fe_cwIter == Mesh::FaceEdgeCWIter(mesh_.fe_ccwbegin(mesh_.face_handle(1))) ) << "ccw to cw conversion failed";
+  EXPECT_TRUE( Mesh::FaceEdgeCCWIter(fe_cwIter) == mesh_.fe_ccwbegin(mesh_.face_handle(1)) ) << "cw to ccw conversion failed";
+  // b)
+  EXPECT_EQ( fe_cwIter->idx(), Mesh::FaceEdgeCCWIter(fe_cwIter)->idx()) << "iterators doesnt point on the same element";
+  // c)
+  ++fe_cwIter;
+  fe_ccwend = mesh_.fe_ccwend(mesh_.face_handle(1));
+  --fe_ccwend;
+  EXPECT_EQ(fe_cwIter->idx(),fe_ccwend->idx()) << "iteratoes are not equal after inc/dec";
+  // additional conversion check
+  fe_ccwend = Mesh::FaceEdgeCCWIter(fe_cwIter);
+  EXPECT_EQ(fe_cwIter->idx(),fe_ccwend->idx())<< "iterators doesnt point on the same element";
+  // d)
+  fe_cwIter = Mesh::FaceEdgeCWIter(mesh_.fe_ccwend(mesh_.face_handle(1)));
+  EXPECT_FALSE(fe_cwIter.is_valid()) << "end iterator is not invalid";
+  EXPECT_TRUE(Mesh::FaceEdgeCCWIter(mesh_.fe_cwend(mesh_.face_handle(1))) ==  mesh_.fe_ccwend(mesh_.face_handle(1))) << "end iterators are not equal";
+
+}
+
 
 /*
  * Test if the end iterator stays invalid after one lap