examples: use Surface.select_vertices()

examples/continuous_border.ipynb

@@ -37,19 +37,17 @@
     "def add_blocks_along(border_chain: PolygonalChain, length_add_mm: float,\n",
     "                     height_mm: float, width_mm: float):\n",
     "    for vertex_triplet_indices in border_chain.adjacent_vertex_indices(3):\n",
-    "        vertex_triplet_coords = tuple(numpy.array(surface.vertices[idx])\n",
-    "                                      for idx in vertex_triplet_indices)\n",
-    "        backward_vector = vertex_triplet_coords[0] - vertex_triplet_coords[1]\n",
-    "        forward_vector = vertex_triplet_coords[2] - vertex_triplet_coords[1]\n",
+    "        vertex_triplet = surface.select_vertices(vertex_triplet_indices)\n",
+    "        backward_vector = vertex_triplet[0] - vertex_triplet[1]\n",
+    "        forward_vector = vertex_triplet[2] - vertex_triplet[1]\n",
     "        forward_vector = unit_vector(forward_vector) \\\n",
     "                         * (numpy.linalg.norm(forward_vector) + length_add_mm)\n",
     "        upward_vector = unit_vector(numpy.cross(backward_vector, forward_vector)) * height_mm / 2\n",
     "        sideward_vector = unit_vector(numpy.cross(upward_vector, forward_vector)) * width_mm / 2\n",
-    "        base_corners = [vertex_triplet_coords[1] + v\n",
-    "                                 for v in [-upward_vector -sideward_vector,\n",
-    "                                           -upward_vector +sideward_vector,\n",
-    "                                           +upward_vector +sideward_vector,\n",
-    "                                           +upward_vector -sideward_vector]]\n",
+    "        base_corners = [vertex_triplet[1] + v for v in [-upward_vector -sideward_vector,\n",
+    "                                                        -upward_vector +sideward_vector,\n",
+    "                                                        +upward_vector +sideward_vector,\n",
+    "                                                        +upward_vector -sideward_vector]]\n",
     "        top_corners = [v + forward_vector for v in base_corners]\n",
     "        base_indices = [surface.add_vertex(Vertex(*coords)) for coords in base_corners]\n",
     "        top_indices = [surface.add_vertex(Vertex(*coords)) for coords in top_corners]\n",

examples/precentral_gyrus_border.ipynb

@@ -72,7 +72,7 @@
     "BORDER_WIDTH = 0.8 # mm\n",
     "\n",
     "for vertex_triplet_indices in border_chain.adjacent_vertex_indices(3):\n",
-    "    vertex_triplet = [surface.vertices[idx] for idx in vertex_triplet_indices]\n",
+    "    vertex_triplet = surface.select_vertices(vertex_triplet_indices)\n",
     "    backward_vector = vertex_triplet[0] - vertex_triplet[1]\n",
     "    forward_vector = unit_vector(vertex_triplet[2] - vertex_triplet[1]) * BORDER_WIDTH / 2\n",
     "    upward_vector = unit_vector(numpy.cross(backward_vector, forward_vector)) * BORDER_WIDTH / 2\n",