Implementerte HeightMap

read_tiff.cpp

@@ -10,7 +10,7 @@
 #include <stdfloat>
 #include <thread>
 #include <vector>
-/*
+
 class HeightMap
 {
     public:
@@ -18,18 +18,59 @@ class HeightMap
         int x_size;
         int y_size;
 
-        HeightMap(int x_size, int y_size);
+        HeightMap(const char* filepath);
+        float get_pixel(int x,int y);
 };
 
-HeightMap::HeightMap(int x_size, int y_size, char* filepath) {
-    this->x_size = x_size;
-    this->y_size = y_size;
+HeightMap::HeightMap(const char* filepath) 
+{
+    // Open the file with some gdal nonsense:
+    const GDALAccess eAccess = GA_ReadOnly;
+    GDALDatasetUniquePtr file;
+    GDALAllRegister();
+    file = GDALDatasetUniquePtr(GDALDataset::FromHandle(GDALOpen( filepath, eAccess )));
+    if( !file )
+    {
+        std::cout << "Could not open tiff file!"; // handle error
+    }
+    
+    // The heigthmap only has one band
+    auto band = file->GetBands()[0];
+    // write the attrributes
+    this->x_size = band->GetXSize();
+    this->y_size = band->GetYSize();
+    
     this->data = (float *) CPLMalloc(sizeof(GDT_Float32)*x_size*y_size);
-
-
+    band->RasterIO( GF_Read, 0, 0, x_size, y_size,
+                    this->data, x_size, y_size, GDT_Float32,
+                    0, 0 );
 }
-*/
+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->x_size * y + x) * sizeof(GDT_Float32);
+    return *(this->data + offset);
+}
+
 int main(int argc, const char* argv[])
+{
+    const char* filepath = argv[1];
+    HeightMap map(filepath); 
+    std::cout << map.get_pixel(0, 0);
+    /*
+    for (int i = 0; i < map.x_size*map.y_size; i++)
+    
+    {
+        map.data+=sizeof(GDT_Float32);
+        if (*map.data)
+        {
+        std::cout << *map.data<<"  "<<i<<"\n";
+        }
+    }
+    */
+}
+/*
+int oldmain(int argc, const char* argv[])
 {
     if (argc != 2) {
         return EINVAL;
@@ -57,7 +98,7 @@ int main(int argc, const char* argv[])
     if( poDataset->GetProjectionRef()  != NULL )
         printf( "Projection is `%s'\n", poDataset->GetProjectionRef() );
     if( poDataset->GetGeoTransform( adfGeoTransform ) == CE_None )
-    {
+    {poDataset
         printf( "Origin = (%.6f,%.6f)\n",
                 adfGeoTransform[0], adfGeoTransform[3] );
         printf( "Pixel Size = (%.6f,%.6f)\n",
@@ -86,3 +127,4 @@ int main(int argc, const char* argv[])
     }
     std::cout << "🤡"<<*buffer;
 }   
+*/