Tried fixing gdal bullshit in steepnes method

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "extern/argh"]
-	path = extern/argh
-	url = https://github.com/adishavit/argh.git

CMakeLists.txt

@@ -1,22 +1,15 @@
-cmake_minimum_required(VERSION 3.20)
-
 project(
   contour-creator
   LANGUAGES CXX)    
   
+find_package(GDAL CONFIG REQUIRED)
+
 add_executable(${PROJECT_NAME}
 	src/HeightMap.cpp src/CellMap.cpp src/main.cpp
 )
-
-# Argh is a simple argrument parser
-add_subdirectory(extern/argh)
-target_link_libraries(${PROJECT_NAME} PRIVATE argh)
-
-# Gdal is used for geodata IO
-find_package(GDAL CONFIG REQUIRED)
-target_link_libraries(${PROJECT_NAME} PRIVATE GDAL::GDAL)
-
 find_package(OpenMP)
 if(OpenMP_CXX_FOUND)
     target_link_libraries(${PROJECT_NAME} PUBLIC OpenMP::OpenMP_CXX)
-endif()
+endif()
+
+target_link_libraries(${PROJECT_NAME} GDAL::GDAL)

build&run.sh

@@ -3,4 +3,4 @@ rm -rf build
 mkdir build
 cmake -DCMAKE_BUILD_TYPE=Debug -B build
 cmake --build build --parallel 
-build/contour-creator --interval=1 --blur example_files/crop.tif
+build/contour-creator 'example_files/crop.tif'

src/HeightMap.cpp

@@ -1,3 +1,4 @@
+#include <cstddef>
 #include <gdal/cpl_conv.h>
 #include <iostream>
 #include <stdexcept>
@@ -5,7 +6,7 @@
 #include <gdal/gdal.h>
 #include "gdal/gdal_priv.h"
 #include <gdal/gdal_frmts.h>
-
+//#include "matplotlibcpp.h"
 #include "contour_creator.hh"
 
 
@@ -32,6 +33,7 @@ HeightMap::HeightMap(const char* filepath)
     //https://gdal.org/api/gdaldataset_cpp.html#_CPPv4N11GDALDataset15GetGeoTransformEPd
     this->geotransform = (double *) CPLMalloc(sizeof(double)*6);
     this->reference_system = *(file->GetSpatialRef());
+    this->filepath = filepath;
 
     file->GetGeoTransform(this->geotransform);
     
@@ -41,6 +43,7 @@ HeightMap::HeightMap(const char* filepath)
                     0, 0 );
     if (error) { throw std::runtime_error("Could not read tif file!"); }
     band->FlushCache();
+    const int size = this->width*this->height;
 }
 float HeightMap::get_pixel(int x, int y)
 {
@@ -62,7 +65,7 @@ void HeightMap::blur(float standard_deviation)
         *(kernel + i) = 1.0;
     }
 
-    float* blurred = (float *) CPLMalloc(sizeof(float)*this->width*this->height);
+    float* blurred = new float[this->width*this->height];
     #pragma omp parallel
     {
     #pragma omp for
@@ -90,4 +93,101 @@ void HeightMap::blur(float standard_deviation)
     free(this->data);
     this->data = blurred;
     blurred = nullptr;
+}
+
+void HeightMap::statistics()
+{
+
+    float avg = 0;
+    float var = 0;
+    float std = 0;
+
+    for (int i = 0; i < this->width*this->height; i++)
+        {int x = i%this->width;
+        int y = i/this->width;
+            if (x<0 || x>=this->width)
+            {
+                x = 0;
+            }
+            
+            if (y<0 || y>=this->height)
+            {
+                y = 0;
+            }
+        avg += this->get_pixel(x, y);}
+        //std::cout << this->get_pixel(x, y);}
+    
+    avg = avg/(this->width*this->height);
+    std::cout << "Average value: " << avg <<"\n";
+
+    for (int i = 0; i < this->width*this->height; i++)
+    {
+        int x = i%this->width;
+        int y = i/this->width;
+        var += (avg - this->get_pixel(x, y))*(avg - this->get_pixel(x, y));
+    }
+    std = sqrt(var)/(this->width*this->height-1);
+    var = var / (this->width*this->height-1);
+    std::cout << "std: " << std << "\n";
+    std::cout << "var: " << var << "\n";
+};
+
+
+void HeightMap::calculate_steepness()
+{
+    int kernel_height = 5;
+    int kernel_width = 5;
+    int kernel_size = kernel_height*kernel_width;
+
+    float* kernel = new float[sizeof(float)*kernel_size];
+    float* steepness = new float[this->width*this->height];
+    #pragma omp parallel
+    {
+    #pragma omp for
+    for (int i = 0; i < this->height * this->width; i++)
+    {
+        int x = i%this->width;
+        int y = i/this->width;
+        float max = 0;
+        float min = 0;
+        for (int j = 0; j < kernel_size; j++)
+        {
+            if (this->get_pixel(x, y) > max)
+            {
+                max = get_pixel(x, y);
+            }
+
+            if (this->get_pixel(x, y) < min)
+            {
+                min = get_pixel(x, y);
+            }
+
+            if (x<0 || x>=this->width)
+            {
+                x = 0;
+            }
+            
+            if (y<0 || y>=this->height)
+            {
+                y = 0;
+            }
+            
+        }
+        steepness[i] = max - min;
+    }
+    }
+    GDALAllRegister();
+    GDALDataset *original_file = (GDALDataset *) GDALOpen( filepath, GA_ReadOnly );
+
+    const char * filename = "steepness.tif";
+    auto driver = GetGDALDriverManager()->GetDriverByName("GeoRaster");
+    GDALDataset *file;
+    file = driver->CreateCopy("steepness.tif", original_file, FALSE, NULL, NULL, NULL);
+
+    file->AddBand(GDT_Float32, NULL);
+    GDALRasterBand *band = file->GetRasterBand(0);
+    CPLErr error = band->RasterIO( GF_Write, 0, 0, this->width, this->height,
+                    steepness, this->width, this->height, GDT_Float32,
+                    0, 0 );
+    GDALClose(file);
 }

src/contour_creator.hh

@@ -16,10 +16,12 @@ class HeightMap
         float min; //!< Minimum value in image
         float max; //!< Maximum value in image
         OGRSpatialReference reference_system;
-
         HeightMap(const char* filepath);
+        const char* filepath;
         float get_pixel(int x,int y);
         void blur(float standard_deviation);
+        void statistics();
+        void calculate_steepness();
 };
 
 /**

src/main.cpp

@@ -12,7 +12,8 @@
 #include "gdal/gdal_priv.h"
 #include <gdal/gdal_frmts.h>
 #include <omp.h>
-#include "argh.h"
+//#include "matplotlibcpp.h"
+//namespace plt = matplotlibcpp;
 
 std::vector<Point> produce_cellmap(HeightMap* heightmap, float z)
 {
@@ -228,34 +229,25 @@ void write_output_file(std::vector<std::vector<Point>> all_points, const char *f
 
 int main(int argc, const char* argv[])
 {
-    argh::parser cmdl(argv);
-
-    if (cmdl[{ "-h", "--help" }])
-    {
-        std::cout << "Usage:\n"
-            << "contour_creator [OPTIONS] <input_file>\n"
-            << "-o; --output <FILENAME.geojson> - File to write output to (Default: contours.geojson)\n"
-            << "-i; --interval <int> - Set the interval between contours (Default: 5)\n"
-            << "-b; --blur - Blur the image\n"
-            << "--stats - Print statistical information about the heightmap\n";
-            exit(0);
-    }
-    int interval;
-    cmdl({"-i", "--interval"}, 5) >> interval;
-    if (interval <= 0)
-        std::cerr << "Interval must be valid positive integer!" << "\n";
+    const char* filepath = argv[1];
+    HeightMap map(filepath); 
     
-    std::string output_file;
-    cmdl({"-o", "--output"}, "contours.geojson") >> output_file;
+    std::cout << "x: " << map.width << "    y: " << map.height << "\n";
+    std::cout << "max: " << map.max << "    min: " << map.min << "\n";
 
-    std::string input_file;
-    cmdl(1) >> input_file;
+    map.blur(0.8);
+
+    map.statistics();
+
+    map.calculate_steepness();
     
+    auto lines = create_lines(&map, 5);
+    write_output_file(lines, "out.geojson", &map);
 
-    HeightMap map(input_file.c_str());
-    if (cmdl[{"-b", "--blur"}])
-        map.blur(0.8);
-    auto lines = create_lines(&map, interval);
-    write_output_file(lines, output_file.c_str(), &map);
-    std::cout << "Contours written to " << output_file << " 🗺️\n";
+
+    std::vector<int> y = {1, 2, 3};
+    //plt::plot(y, "bo-");
+    //plt::show();
+
+    return 0;
 }