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5 Commits

Author SHA1 Message Date
29a7ddb083 Cleanup 2024-04-28 22:31:05 +02:00
98a312094e Added box blur 2024-04-28 22:30:37 +02:00
882764a13d Created a lookup table 2024-04-27 18:01:43 +02:00
f962a40ade Fixed segfault 2024-04-27 17:15:37 +02:00
ee0b87c2b3 Start to implement line drawing 2024-04-26 15:40:09 +02:00
3 changed files with 100 additions and 54 deletions

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@ -1,7 +1,7 @@
#include <gdal/cpl_conv.h> #include <gdal/cpl_conv.h>
#include <iostream> #include <iostream>
#include <stdexcept> #include <stdexcept>
#include <omp.h>
#include <gdal/gdal.h> #include <gdal/gdal.h>
#include "gdal/gdal_priv.h" #include "gdal/gdal_priv.h"
#include <gdal/gdal_frmts.h> #include <gdal/gdal_frmts.h>
@ -48,4 +48,46 @@ float HeightMap::get_pixel(int x, int y)
int offset = ((this->width * y) + x); int offset = ((this->width * y) + x);
//std::cout << " offset: " << offset << " " << x << ","<< y; //std::cout << " offset: " << offset << " " << x << ","<< y;
return *(this->data + offset); return *(this->data + offset);
}
void HeightMap::blur(float standard_deviation)
{
// standard_deviation does not do anything yet. This is currently a simple box blur
int kernel_height = 5;
int kernel_width = 5;
int kernel_size = kernel_height*kernel_width;
float* kernel = (float*) CPLMalloc(sizeof(float)*kernel_size);
for (int i=0; i<kernel_size; i++)
{
*(kernel + i) = 1.0;
}
float* blurred = (float *) CPLMalloc(sizeof(float)*this->width*this->height);
#pragma omp parallel
{
#pragma omp for
for (int i = 0; i < this->height * this->width; i++)
{
float blurred_pixel = 0;
for (int j = 0; j < kernel_size; j++)
{
int x = j%kernel_width - kernel_width/2 + i%this->width;
int y = j/kernel_width - kernel_height/2 + i/this->width;
if (x<0 || x>=this->width)
{
x = 0;
}
if (y<0 || y>=this->height)
{
y = 0;
}
blurred_pixel += this->get_pixel(x, y);
}
*(blurred + i) = blurred_pixel/float(kernel_size);
}
}
free(this->data);
this->data = blurred;
blurred = nullptr;
} }

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@ -19,6 +19,7 @@ class HeightMap
HeightMap(const char* filepath); HeightMap(const char* filepath);
float get_pixel(int x,int y); float get_pixel(int x,int y);
void blur(float standard_deviation);
}; };
/** /**

View File

@ -1,6 +1,9 @@
#include "contour_creator.hh" #include "contour_creator.hh"
#include <gdal/ogr_api.h> #include <gdal/ogr_api.h>
#include "ogrsf_frmts.h" #include "ogrsf_frmts.h"
#include <gdal/ogr_core.h>
#include <gdal/ogr_feature.h>
#include <gdal/ogr_geometry.h>
#include <iostream> #include <iostream>
#include <ostream> #include <ostream>
#include <vector> #include <vector>
@ -53,17 +56,36 @@ std::vector<CellMap> vector_cellmap(HeightMap* heightmap, int interval)
std::tuple<double, double> local_to_projected(double* geotransform, int x, int y) std::tuple<double, double> local_to_projected(double* geotransform, int x, int y)
{ {
return { return {
geotransform[1] * x + geotransform[2] * y + geotransform[1] * x + geotransform[2] * y +
geotransform[1] * 0.5 + geotransform[2] * 0.5 + geotransform[0], geotransform[1] * 0.5 + geotransform[2] * 0.5 + geotransform[0],
geotransform[4] * x + geotransform[5] * y + geotransform[4] * x + geotransform[5] * y +
geotransform[4] * 0.5 + geotransform[5] * 0.5 + geotransform[3] geotransform[4] * 0.5 + geotransform[5] * 0.5 + geotransform[3]
}; };
} }
constexpr std::tuple<double, double, double, double> marching_squares_lookup(int mcase)
{
switch (mcase) {
case 1: return {0, 0.5, 0.5, 0};
case 2: return {1, 0.5, 0.5, 0};
case 3: return {0, 0.5, 1, 0};
case 4: return {0.5, 1, 1, 0.5};
case 5: return {0, 0, 0, 0}; //FIXME
case 6: return {0.5, 1, 0.5, 0};
case 7: return {0, 0.5, 0.5, 1};
case 8: return {0, 0.5, 0.5, 1};
case 9: return {0.5, 1, 0.5, 0};
case 10: return {0, 0, 0, 0}; //FIXME
case 11: return {0.5, 1, 1, 0.5};
case 12: return {0, 0.5, 1, 0.5};
case 13: return {0.5, 0, 1, 0.5};
case 14: return {0, 0.5, 0.5, 0};
};
}
void write_output_file(std::vector<CellMap> cellmaps, const char *filepath) void write_output_file(std::vector<CellMap> cellmaps, const char *filepath)
{ {
const char *pszDriverName = "ESRI Shapefile"; const char *pszDriverName = "GeoJSON";
GDALDriver *poDriver; GDALDriver *poDriver;
GDALAllRegister(); GDALAllRegister();
@ -86,7 +108,7 @@ void write_output_file(std::vector<CellMap> cellmaps, const char *filepath)
OGRLayer *poLayer; OGRLayer *poLayer;
poLayer = poDS->CreateLayer( "contours", &(cellmaps[0]).reference_system, wkbPoint, NULL ); poLayer = poDS->CreateLayer( "contours", &(cellmaps[0]).reference_system, wkbLineString, NULL );
if( poLayer == NULL ) if( poLayer == NULL )
{ {
printf( "Layer creation failed.\n" ); printf( "Layer creation failed.\n" );
@ -105,53 +127,44 @@ void write_output_file(std::vector<CellMap> cellmaps, const char *filepath)
for (int j = 0; j < cellmaps.size(); j++) for (int j = 0; j < cellmaps.size(); j++)
{ {
CellMap* cellmap = &cellmaps[j]; CellMap* cellmap = &cellmaps[j];
for (int i = 0; i<cellmap->height*cellmap->width; i++) {
for (int i = 0; i < cellmap->height*cellmap->width; i++)
{
if (*(cellmap->cells + i) != 0 && *(cellmap->cells + i) != 15) if (*(cellmap->cells + i) != 0 && *(cellmap->cells + i) != 15)
{ {
OGRFeature *poFeature; OGRFeature *feature;
poFeature = OGRFeature::CreateFeature( poLayer->GetLayerDefn() ); OGRLineString *geometry = new OGRLineString();
poFeature->SetField( "Name", *(cellmap->cells + i) ); feature = OGRFeature::CreateFeature( poLayer->GetLayerDefn() );
feature->SetField( "Name", j );
//OGRSpatialReference local;
//auto poCT = OGRCreateCoordinateTransformation( &local, &cellmap->reference_system );
/*
if( poCT == NULL || !poCT->Transform( 1, &x, &y ) )
printf( "Transformation failed.\n" );
*/
OGRPoint pt;
int x_raw = i%cellmap->width; int x_raw = i%cellmap->width;
int y_raw = i/cellmap->width; int y_raw = i/cellmap->width;
auto [x, y] = local_to_projected(cellmap->geotransform, x_raw, y_raw); auto [x, y] = local_to_projected(cellmap->geotransform, x_raw, y_raw);
auto [x_bl, y_bl, x_tr, y_tr] = marching_squares_lookup(*(cellmap->cells + i) );
//std::cout << x << ", " << y << " ";
geometry->setPoint( geometry->getNumPoints(), x+x_tr*0.25, y+y_tr*0.25 );
geometry->setPoint( geometry->getNumPoints(), x+x_bl*0.25, y+y_bl*0.25 );
pt.setX( x ); if ( feature->SetGeometry(geometry) != OGRERR_NONE)
pt.setY( y ); {
printf( "Failed to set geometry.\n" );
poFeature->SetGeometry( &pt ); exit( 1 );
}
if( poLayer->CreateFeature( poFeature ) != OGRERR_NONE ) OGRGeometryFactory::destroyGeometry(geometry);
if( poLayer->CreateFeature( feature ) != OGRERR_NONE )
{ {
printf( "Failed to create feature in shapefile.\n" ); printf( "Failed to create feature in shapefile.\n" );
exit( 1 ); exit( 1 );
} }
OGRFeature::DestroyFeature( feature );
OGRFeature::DestroyFeature( poFeature ); }
}
} }
} }
GDALClose( poDS ); GDALClose( poDS );
/*
OGRDataSourceH datasource = OGR_Dr_CreateDataSource(OGRGetDriverByName("GeoJSON"), "contour.geojson", new char*);
OGRSpatialReference reference_system = cellmap->reference_system;
OGRLayerH layer = OGR_DS_CreateLayer(datasource, "contour", &reference_system, wkbLineString25D, new char*);
auto feature = OGR_F_Create(OGR_L_GetLayerDefn(static_cast<OGRLayerH>(layer)));
OGRGeometryH geometry = OGR_G_CreateGeometry(wkbLineString25D);
*/
} }
int main(int argc, const char* argv[]) int main(int argc, const char* argv[])
@ -161,21 +174,11 @@ int main(int argc, const char* argv[])
std::cout << "x: " << map.width << " y: " << map.height << "\n"; std::cout << "x: " << map.width << " y: " << map.height << "\n";
std::cout << "max: " << map.max << " min: " << map.min << "\n"; std::cout << "max: " << map.max << " min: " << map.min << "\n";
map.blur(0.8);
auto cellmap = produce_cellmap(&map, 40); auto cellmap = produce_cellmap(&map, 40);
/*
for (int y = 0; y < cellmap.height; y++)
{
for (int x = 0; x < cellmap.width; x++)
{
if (cellmap.get_cell(x, y) && cellmap.get_cell(x, y)!=15) {
std::cout << x << ","<< y << "=" << cellmap.get_cell(x, y) << " ";
}
}
//std::cout << "\n";
}
*/
auto cellmaps = vector_cellmap(&map, 5); auto cellmaps = vector_cellmap(&map, 5);
write_output_file(cellmaps, "out.shp"); write_output_file(cellmaps, "out.geojson");
} }