feat: add polyline attribute example, improve polyline creation example

Author: lbinria

examples/CMakeLists.txt

@@ -65,4 +65,5 @@ ENDIF()
 # Copy asset files to build directory
 configure_file(assets/catorus.geogram assets/catorus.geogram COPYONLY)
 configure_file(assets/tet_13225.geogram assets/tet_13225.geogram COPYONLY)
-configure_file(assets/quarterdisk_tri.mesh assets/quarterdisk_tri.mesh COPYONLY)
+configure_file(assets/quarterdisk_tri.mesh assets/quarterdisk_tri.mesh COPYONLY)
+configure_file(assets/pyramid.geogram assets/pyramid.geogram COPYONLY)

examples/assets/pyramid.geogram

@@ -58,6 +58,24 @@ int main() {
 
     // TODO
 
+    // --- EDGE ATTR ---
+
+    // Load mesh
+    PolyLine p;
+    read_by_extension(path + "pyramid.geogram", p);
+
+    // Create a edge attribute
+    EdgeAttribute<int> edge_id_attr(p); 
+    // For all edge in polyline set edge attribute with edge id
+    for (auto &e : p.iter_edges()) {
+        edge_id_attr[e] = e;
+        std::cout << (int)e << std::endl;
+    }
+
+    write_by_extension("pyramid_attr.geogram", p, {{"edge_id", edge_id_attr}});
+
+    // --- END EDGE ATTR ---
+
     // --- SAVE ALL ATTRIBUTES ---
 
     // Save mesh with all previously created attributes

examples/create_fill_attributes.cpp

@@ -16,41 +16,61 @@ int main() {
 
     // --- CREATE ---
 
-    // Create 3 points in polyline
-    p.points.create_points(3);
-    p.points[0] = {0,0,0};
-    p.points[1] = {1,0,0};
-    p.points[2] = {1,1,0};
+    // Create 5 points in polyline
+    p.points.create_points(5);
+    p.points[0] = vec3(0, 0, 0);
+    p.points[1] = vec3(1, 0, 0);
+    p.points[2] = vec3(1, 1, 0);
+    p.points[3] = vec3(0, 1, 0);
+    p.points[4] = vec3(0.5, 0.5, 1);
 
     // Create edges
-    p.create_edges(2);
+    p.create_edges(8);
 
     // Link segment 0 with point 0
     p.vert(0, 0) = 0;
     // Link segment 0 with point 1
     p.vert(0, 1) = 1;
+
     // Link segment 1 with point 0
-    p.vert(1, 0) = 0;
+    p.vert(1, 0) = 1;
     // ...
     p.vert(1, 1) = 2;
 
-    EdgeAttribute<int> edge_attr(p);
+    p.vert(2, 0) = 2;
+    p.vert(2, 1) = 3;
+
+    p.vert(3, 0) = 3;
+    p.vert(3, 1) = 0;
+
+    p.vert(4, 0) = 0;
+    p.vert(4, 1) = 4;
 
+    p.vert(5, 0) = 1;
+    p.vert(5, 1) = 4;
+
+    p.vert(6, 0) = 2;
+    p.vert(6, 1) = 4;
+
+    p.vert(7, 0) = 3;
+    p.vert(7, 1) = 4;
+
+    EdgeAttribute<int> edge_attr(p);
     edge_attr[0] = 0;
     edge_attr[1] = 1;
 
     // --- SAVE ---
 
     // Save mesh
-    write_by_extension("simple_polyline.geogram", p, {{}, {{"my_edge_attr", edge_attr.ptr}}});
+    write_by_extension("pyramid.geogram", p, {{"my_edge_attr", edge_attr}});
 
     // --- END ---
 
     // --- RUN ---
 
     #ifdef _WIN32
     // Open the generated mesh with Graphite
-    int result = system((getGraphitePath() + " simple_polyline.geogram").c_str());
+    int result = system((getGraphitePath() + " pyramid.geogram").c_str());
     #endif
 
     return 0;