feat: add create polyline example

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.12...3.26)
 
 project( playground LANGUAGES C CXX )
-set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 get_property(is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
@@ -24,7 +24,7 @@ include(FetchContent)
 FetchContent_Declare(
   ultimaille
   GIT_REPOSITORY https://github.com/ssloy/ultimaille
-  GIT_TAG        v1.0.0
+  GIT_TAG        v1.1.1
 )
 FetchContent_MakeAvailable(ultimaille)
 include_directories(${ultimaille_SOURCE_DIR})

examples/CMakeLists.txt

@@ -20,6 +20,7 @@ add_executable(create_tri_mesh create_tri_mesh.cpp)
 add_executable(edit_mesh edit_mesh.cpp)
 add_executable(algebra algebra.cpp)
 add_executable(create_volume_mesh create_volume_mesh.cpp)
+add_executable(create_polyline create_polyline.cpp)
 
 target_link_libraries(hello  ${CMAKE_DL_LIBS} ultimaille $<$<BOOL:${OpenMP_CXX_FOUND}>:OpenMP::OpenMP_CXX>)
 target_link_libraries(vertex_distances  ${CMAKE_DL_LIBS} ultimaille $<$<BOOL:${OpenMP_CXX_FOUND}>:OpenMP::OpenMP_CXX>)
@@ -37,6 +38,7 @@ target_link_libraries(create_tri_mesh ${CMAKE_DL_LIBS} ultimaille $<$<BOOL:${Ope
 target_link_libraries(edit_mesh ${CMAKE_DL_LIBS} ultimaille $<$<BOOL:${OpenMP_CXX_FOUND}>:OpenMP::OpenMP_CXX>)
 target_link_libraries(algebra ${CMAKE_DL_LIBS} ultimaille $<$<BOOL:${OpenMP_CXX_FOUND}>:OpenMP::OpenMP_CXX>)
 target_link_libraries(create_volume_mesh ${CMAKE_DL_LIBS} ultimaille $<$<BOOL:${OpenMP_CXX_FOUND}>:OpenMP::OpenMP_CXX>)
+target_link_libraries(create_polyline ${CMAKE_DL_LIBS} ultimaille $<$<BOOL:${OpenMP_CXX_FOUND}>:OpenMP::OpenMP_CXX>)
 
 IF (NOT WIN32)
 	target_link_libraries(hello m)
@@ -54,6 +56,7 @@ IF (NOT WIN32)
     target_link_libraries(algebra m)
     target_link_libraries(create_volume_mesh m)
     target_link_libraries(quad_subdivision m)
+    target_link_libraries(create_polyline m)
 ENDIF()
 
 # Copy asset files to build directory

examples/create_polyline.cpp

@@ -0,0 +1,57 @@
+/**
+ * This example shows how to create a polyline from scratch
+*/
+#include "helpers.h"
+#include <ultimaille/all.h>
+
+
+using namespace UM;
+
+int main(int argc, char** argv) {
+
+    // --- LOAD ---
+
+    // Declare a polyline
+    PolyLine p;
+
+    // --- 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 edges
+    p.create_edges(2);
+
+    // 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, 1) = 2;
+
+    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}}});
+
+    // --- END ---
+
+    // --- RUN ---
+
+    #ifdef _WIN32
+    // Open the generated mesh with Graphite
+    int result = system((getGraphitePath() + " simple_polyline.geogram").c_str());
+    #endif
+
+    return 0;
+}