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https://gitlab.com/Trygve/contour-creator.git
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Seperate line creation so it can be paralized
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parent
77467594bd
commit
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209
src/main.cpp
209
src/main.cpp
@ -36,55 +36,6 @@ std::vector<Point> produce_cellmap(HeightMap* heightmap, float z)
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}
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std::vector<std::vector<Point>> vector_cellmap(HeightMap* heightmap, int interval)
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{
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int num_contours = (heightmap->max - heightmap->min)/interval;
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std::vector<std::vector<Point>> vector_contours;
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omp_set_num_threads(12);
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#pragma omp parallel
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{
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std::vector<std::vector<Point>> vec_private;
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#pragma omp for
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for (int i = 1; i <= num_contours; i++)
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{
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auto points = produce_cellmap(heightmap, heightmap->min + interval*i);
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for (int j = 0; j < points.size(); j++){
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Point current = points[j];
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//std::cout << points_allocated << " " << points.size() << "\n";
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for (int k = 0; k < points.size(); k++){
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Point candidate = points[k];
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if (candidate.next != nullptr) {
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if (candidate.x +1 == current.x) {
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current.next = &candidate;
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}
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else if (candidate.x -1 == current.x) {
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current.next = &candidate;
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}
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else if (candidate.y +1 == current.x) {
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current.next = &candidate;
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}
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else if (candidate.y -1 == current.x) {
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current.next = &candidate;
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}
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}
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}
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}
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}
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#pragma omp critical
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vector_contours.insert(vector_contours.end(), vec_private.begin(), vec_private.end());
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}
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return vector_contours;
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}
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std::tuple<double, double> local_to_projected(double* geotransform, int x, int y)
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{
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return {
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@ -94,6 +45,116 @@ std::tuple<double, double> local_to_projected(double* geotransform, int x, int y
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geotransform[4] * 0.5 + geotransform[5] * 0.5 + geotransform[3]
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};
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}
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std::vector<OGRFeature*> create_contours(OGRFeatureDefn* layer_def, std::vector<Point> points, HeightMap* heightmap)
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{
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std::vector<OGRFeature*> lines;
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for (int i = 0; i<points.size();i++)
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{
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OGRFeature *feature;
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OGRLineString *geometry = new OGRLineString();
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feature = OGRFeature::CreateFeature(layer_def);
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feature->SetField( "Name", i );
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Point* current = &points[0];
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int points_delegated = 0;
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while (points_delegated < points.size())
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{
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//int x_raw = i%width;
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//int y_raw = i/height;
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int x_raw = current->x;
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int y_raw = current->y;
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auto [x, y] = local_to_projected(heightmap->geotransform, x_raw, y_raw);
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//std::cout << x << ", " << y << " ";
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//auto [x_bl, y_bl, x_tr, y_tr] = marching_squares_lookup(*(cellmap->cells + i) );
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//std::cout << x << ", " << y << " ";
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//geometry->setPoint( geometry->getNumPoints(), x+x_tr*0.25, y+y_tr*0.25 );
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//geometry->setPoint( geometry->getNumPoints(), x+x_bl*0.25, y+y_bl*0.25 );
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geometry->setPoint(geometry->getNumPoints(),x ,y );
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points_delegated++;
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current = current->next;
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if (current == nullptr)
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{
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for (int k = 0; k < points.size(); k++)
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{
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if (points[k].previous == nullptr)
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{
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current = &points[k];
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}
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}
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if (current == nullptr)
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{
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break;
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}
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}
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}
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if ( feature->SetGeometry(geometry) != OGRERR_NONE)
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{
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printf( "Failed to set geometry.\n" );
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exit( 1 );
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}
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OGRGeometryFactory::destroyGeometry(geometry);
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lines.push_back(feature);
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}
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}
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std::vector<OGRFeature*> vector_cellmap(OGRFeatureDefn* layer_def, HeightMap* heightmap, int interval)
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{
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int num_contours = (heightmap->max - heightmap->min)/interval;
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std::vector<OGRFeature*> vector_contours;
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omp_set_num_threads(12);
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#pragma omp parallel
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{
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std::vector<OGRFeature*> lines;
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#pragma omp for
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for (int i = 1; i <= num_contours; i++)
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{
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auto points = produce_cellmap(heightmap, heightmap->min + interval*i);
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for (int j = 0; j < points.size(); j++){
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Point* current = &points[j];
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//std::cout << points_allocated << " " << points.size() << "\n";
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for (int k = 0; k < points.size(); k++){
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Point* candidate = &points[k];
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if (candidate->previous == nullptr) {
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if (candidate->x +1 == current->x && candidate->y == current->y) {
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current->next = candidate;
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candidate->previous = current;
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}
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else if (candidate->x -1 == current->x && candidate->y == current->y) {
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current->next = candidate;
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candidate->previous = current;
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}
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else if (candidate->y +1 == current->y && candidate->x == current->x) {
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current->next = candidate;
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candidate->previous = current;
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}
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else if (candidate->y -1 == current->y && candidate->x == current->x) {
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current->next = candidate;
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candidate->previous = current;
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}
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}
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}
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}
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auto lines = create_lines(layer_def, points, heightmap);
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}
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#pragma omp critical
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vector_contours.insert(vector_contours.end(), lines.begin(), lines.end());
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}
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return vector_contours;
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}
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constexpr std::tuple<double, double, double, double> marching_squares_lookup(int mcase)
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{
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@ -114,7 +175,9 @@ constexpr std::tuple<double, double, double, double> marching_squares_lookup(int
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case 14: return {0, 0.5, 0.5, 0};
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};
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}
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void write_output_file(std::vector<std::vector<Point>> all_points, const char *filepath, HeightMap* heightmap)
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void write_output_file(const char *filepath, HeightMap* heightmap)
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{
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const char *pszDriverName = "GeoJSON";
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@ -160,47 +223,19 @@ void write_output_file(std::vector<std::vector<Point>> all_points, const char *f
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int height = heightmap->height -1;
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int size = width * height;
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for (int j = 0; j < all_points.size(); j++)
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// gets the lines from the heightmap. Runs the actual algorithm
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auto lines = create_contours(poLayer->GetLayerDefn(), heightmap, 5);
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for (int j = 0; j < lines.size(); j++)
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{
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OGRFeature *feature;
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OGRLineString *geometry = new OGRLineString();
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feature = OGRFeature::CreateFeature( poLayer->GetLayerDefn() );
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feature->SetField( "Name", j );
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std::vector<Point> points = all_points[j];
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for (int i = 0; i < points.size(); i++)
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{
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//int x_raw = i%width;
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//int y_raw = i/height;
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int x_raw = points[i].x;
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int y_raw = points[i].y;
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auto [x, y] = local_to_projected(heightmap->geotransform, x_raw, y_raw);
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//auto [x_bl, y_bl, x_tr, y_tr] = marching_squares_lookup(*(cellmap->cells + i) );
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//std::cout << x << ", " << y << " ";
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//geometry->setPoint( geometry->getNumPoints(), x+x_tr*0.25, y+y_tr*0.25 );
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//geometry->setPoint( geometry->getNumPoints(), x+x_bl*0.25, y+y_bl*0.25 );
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geometry->setPoint(geometry->getNumPoints(),x ,y );
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}
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if ( feature->SetGeometry(geometry) != OGRERR_NONE)
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{
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printf( "Failed to set geometry.\n" );
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exit( 1 );
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}
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OGRGeometryFactory::destroyGeometry(geometry);
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if( poLayer->CreateFeature( feature ) != OGRERR_NONE )
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if( poLayer->CreateFeature( lines[j] ) != OGRERR_NONE )
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{
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printf( "Failed to create feature in shapefile.\n" );
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exit( 1 );
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}
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OGRFeature::DestroyFeature( feature );
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OGRFeature::DestroyFeature( lines[j] );
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}
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@ -220,6 +255,6 @@ int main(int argc, const char* argv[])
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auto cellmap = produce_cellmap(&map, 40);
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auto cellmaps = vector_cellmap(&map, 5);
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write_output_file(cellmaps, "out.geojson", &map);
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write_output_file("out.geojson", &map);
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}
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