add documentation

Author: delfrrr

CMakeLists.txt

@@ -1,19 +1,17 @@
 cmake_minimum_required(VERSION 3.0.0)
 project(delaunator VERSION 0.1.0)
-set (CMAKE_CXX_STANDARD 17)
+set (CMAKE_CXX_STANDARD 14)
 if (NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/includes")
     execute_process(COMMAND bash "-c" "(cd ${CMAKE_CURRENT_SOURCE_DIR} && ./fetch-includes.sh)")
 endif()
-# message("PROJECT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}")
 
-add_executable(main src/main.cpp)
+add_executable(triangulate src/triangulate.cpp)
 add_library(delaunator src/delaunator.cpp)
-target_include_directories (main PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/includes/rapidjson/include")
-target_include_directories (main PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/includes/prettyprint")
+target_include_directories (triangulate PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/includes/rapidjson/include")
+target_include_directories (triangulate PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/includes/prettyprint")
 target_include_directories (delaunator PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/includes/rapidjson/include")
 target_include_directories (delaunator PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/includes/prettyprint")
-target_link_libraries(main delaunator)
+target_link_libraries(triangulate delaunator)
 
 set(CPACK_PROJECT_NAME ${PROJECT_NAME})
 set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
-# include(CPack)

CONTRIBUTING.md

@@ -17,7 +17,7 @@
             ],
             "compilerPath": "/usr/bin/clang",
             "cStandard": "c11",
-            "cppStandard": "c++17",
+            "cppStandard": "c++14",
             "intelliSenseMode": "clang-x64",
             "compileCommands": "${workspaceFolder}/build/compile_commands.json"
         }

README.md

@@ -1,27 +1,44 @@
 # delaunator-cpp
 
-**c_cpp_properties.json**
+A really fast C++ library for
+[Delaunay triangulation](https://en.wikipedia.org/wiki/Delaunay_triangulation) of 2D points.
 
-```
-{
-    "configurations": [
-        {
-            "name": "CPP Mac",
-            "includePath": [
-                "${workspaceFolder}/**",
-                "/usr/include/**"
-            ],
-            "defines": [],
-            "macFrameworkPath": [
-                "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/System/Library/Frameworks"
-            ],
-            "compilerPath": "/usr/bin/clang",
-            "cStandard": "c11",
-            "cppStandard": "c++17",
-            "intelliSenseMode": "clang-x64",
-            "compileCommands": "${workspaceFolder}/build/compile_commands.json"
-        }
-    ],
-    "version": 4
+delaunator-cpp is a C++ port from https://github.com/mapbox/delaunator a JavaScript implementation of very fast 2D Delaunay algorithm.
+
+## Features
+
+* Probably the fastest C++ open source 2D Delaunay implementation
+* Roughly 3 times faster then JS version.
+* Example showing triangulation of GeoJson points
+
+## Usage
+
+```CPP
+#include "delaunator.h"
+#include  <cstdio>
+
+//...
+int main(int, char* argv[]) {
+    //...
+    const vector<double> coords = {/* x0, y0, x1, y1, ... */};
+    Delaunator delaunator(coords); //triangulation happens here
+    for(long int i = 0; i < delaunator.triangles.size(); i+=3) {
+        printf(
+            "Triangle points: [[%f, %f], [%f, %f], [%f, %f]]\n",
+            delaunator.coords[2 * delaunator.triangles[i]],         //tx0
+            delaunator.coords[2 * delaunator.triangles[i] + 1],     //ty0
+            delaunator.coords[2 * delaunator.triangles[i + 1]],     //tx1
+            delaunator.coords[2 * delaunator.triangles[i + 1] + 1], //ty1
+            delaunator.coords[2 * delaunator.triangles[i + 2]],     //tx2
+            delaunator.coords[2 * delaunator.triangles[i + 2] + 1], //ty2
+        )
+    }
 }
-```
+```
+
+For full example see `src/triangulate.cpp`
+
+## TODO
+
+* Benchmarks
+* Unit tests

src/delaunator.cpp

@@ -6,7 +6,7 @@
 #include <tuple>
 #include <exception>
 #include <cmath>
-#include "prettyprint.hpp"
+// #include "prettyprint.hpp"
 #include <iostream>
 
 using namespace std;

src/main.cpp renamed to src/triangulate.cpp

@@ -1,4 +1,3 @@
-// #include <iostream>
 #include "rapidjson/document.h"
 #include "rapidjson/prettywriter.h"
 #include "delaunator.h"
@@ -8,7 +7,7 @@
 #include <exception>
 #include <vector>
 #include <initializer_list>
-#include "prettyprint.hpp"
+// #include "prettyprint.hpp"
 #include <iostream>
 using namespace std;
 
@@ -42,9 +41,7 @@ namespace {
             const double y = coordinates[1].GetDouble();
             coords.push_back(x);
             coords.push_back(y);
-            // printf("coordinates %f %f \n", x, y);
         }
-        // Points points = {.x_vector = x_vector, .y_vector = y_vector};
         return coords;
     }
 
@@ -115,17 +112,8 @@ int main(int, char* argv[]) {
         stream.open(output);
         stream << out_json;
         stream.close();
-        // cout << output << endl;
     } else {
         puts(out_json);
     }
-
-    // cout << output << endl;
-    // if (sizeof(argv) > 2) {
-    //     puts("ouput to file");
-    // } else {
-    //     puts(out_json);
-    // }
     return 0;
-    // cout << delaunator.triangles << endl;
 }