Write all contours from vector

CMakeLists.txt

@@ -1,13 +1,15 @@
 project(
   contour-creator
   LANGUAGES CXX)    
-cmake_minimum_required(VERSION 3.0)
   
 find_package(GDAL CONFIG REQUIRED)
 
 add_executable(${PROJECT_NAME}
 	src/HeightMap.cpp src/CaseMap.cpp src/main.cpp
 )
-
+find_package(OpenMP)
+if(OpenMP_CXX_FOUND)
+    target_link_libraries(${PROJECT_NAME} PUBLIC OpenMP::OpenMP_CXX)
+endif()
 
 target_link_libraries(${PROJECT_NAME} GDAL::GDAL)

src/HeightMap.cpp

@@ -40,6 +40,6 @@ float HeightMap::get_pixel(int x, int y)
 {
     // all the pixels are in an array of floats from left to right, top to bottom
     int offset = ((this->width * y) + x);
-    std::cout << " " << x << ","<< y;
+    //std::cout << "  offset: " << offset << " " << x << ","<< y;
     return *(this->data + offset);
 } 

src/main.cpp

@@ -9,6 +9,7 @@
 #include <gdal/gdal.h>
 #include "gdal/gdal_priv.h"
 #include <gdal/gdal_frmts.h>
+#include <omp.h>
 
 CaseMap produce_casemap(HeightMap* heightmap, float z)
 {
@@ -29,7 +30,29 @@ CaseMap produce_casemap(HeightMap* heightmap, float z)
 
 }
 
-void write_output_file(CaseMap* casemap, const char *filepath)
+std::vector<CaseMap> vector_casemap(HeightMap* heightmap, int interval)
+{
+    int num_contours = (heightmap->max - heightmap->min)/interval;
+    std::vector<CaseMap> vector_contours;
+omp_set_num_threads(12);
+
+#pragma omp parallel
+{
+    std::vector<CaseMap> vec_private;
+    #pragma omp for
+    for (int i = 1; i <= num_contours; i++) 
+    {
+        vec_private.push_back(produce_casemap(heightmap, heightmap->min + interval*i));
+        std::cout << "Execute thread " << omp_get_num_threads() << " ";
+    }
+    #pragma omp critical
+    vector_contours.insert(vector_contours.end(), vec_private.begin(), vec_private.end());
+
+}
+    return vector_contours;
+}
+
+void write_output_file(std::vector<CaseMap> casemaps, const char *filepath)
 {
 
     const char *pszDriverName = "ESRI Shapefile";
@@ -55,7 +78,7 @@ void write_output_file(CaseMap* casemap, const char *filepath)
 
     OGRLayer *poLayer;
 
-    poLayer = poDS->CreateLayer( "contours", &casemap->reference_system, wkbPoint, NULL );
+    poLayer = poDS->CreateLayer( "contours", &(casemaps[0]).reference_system, wkbPoint, NULL );
     if( poLayer == NULL )
     {
         printf( "Layer creation failed.\n" );
@@ -71,7 +94,9 @@ void write_output_file(CaseMap* casemap, const char *filepath)
         printf( "Creating Name field failed.\n" );
         exit( 1 );
     }
-
+    for (int j = 0; j < casemaps.size(); j++)
+    {
+        CaseMap* casemap = &casemaps[j];
         for (int i = 0; i<casemap->height*casemap->width; i++) {
             if (*(casemap->cases + i) != 0 && *(casemap->cases + i) != 15)
             {
@@ -108,6 +133,7 @@ void write_output_file(CaseMap* casemap, const char *filepath)
                 OGRFeature::DestroyFeature( poFeature );
             }
         }
+    }
 
     GDALClose( poDS );
     /*
@@ -142,5 +168,7 @@ int main(int argc, const char* argv[])
        //std::cout << "\n";
     }
     */
-    write_output_file(&casemap, "out.shp");
+    
+    auto casemaps = vector_casemap(&map, 5);
+    write_output_file(casemaps, "out.shp");
 }