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authorjaseg <git@jaseg.de>2021-01-30 20:01:00 +0100
committerjaseg <git@jaseg.de>2021-01-30 20:01:00 +0100
commit2133867c8a86337c6668f9cfff06e4de9bd0bcce (patch)
treea8d1a9b41f7ae18a5a258e139635e4c54a990fc7 /src/vec_grid.cpp
parent617a42a674bea6fcd90e19092303ce89acf4206e (diff)
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Reorg: move svg-flatten files into subdir
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diff --git a/src/vec_grid.cpp b/src/vec_grid.cpp
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-/*
- * This file is part of gerbolyze, a vector image preprocessing toolchain
- * Copyright (C) 2021 Jan Sebastian Götte <gerbolyze@jaseg.de>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- */
-
-#include "poisson_disk_sampling.h"
-
-#include "vec_grid.h"
-
-using namespace std;
-using namespace gerbolyze;
-
-sampling_fun gerbolyze::get_sampler(enum grid_type type) {
- switch(type) {
- case POISSON_DISC:
- return sample_poisson_disc;
- case HEXGRID:
- return sample_hexgrid;
- case SQUAREGRID:
- return sample_squaregrid;
- default:
- return sample_poisson_disc;
- }
-}
-
-vector<d2p> *gerbolyze::sample_poisson_disc(double w, double h, double center_distance) {
- d2p top_left {0, 0};
- d2p bottom_right {w, h};
- return new auto(thinks::PoissonDiskSampling(center_distance/2.5, top_left, bottom_right));
-}
-
-vector<d2p> *gerbolyze::sample_hexgrid(double w, double h, double center_distance) {
- double radius = center_distance / 2.0 / (sqrt(3) / 2.0); /* radius of hexagon */
- double pitch_v = 1.5 * radius;
- double pitch_h = center_distance;
-
- /* offset of first hexagon to make sure the entire area is covered. We use slightly larger values here to avoid
- * corner cases during clipping in the voronoi map generator. The inaccuracies this causes at the edges are
- * negligible. */
- double off_x = 0.5001 * center_distance;
- double off_y = 0.5001 * radius;
-
- /* NOTE: The voronoi generator is not quite stable when points lie outside the bounds. Thus, floor(). */
- long long int points_x = floor(w / pitch_h);
- long long int points_y = floor(h / pitch_v);
-
- vector<d2p> *out = new vector<d2p>();
- out->reserve((points_x+1) * points_y);
-
- /* This may generate up to one extra row of points. We don't care since these points will simply be clipped during
- * voronoi map generation. */
- for (long long int y_i=0; y_i<points_y; y_i+=2) {
- for (long long int x_i=0; x_i<points_x; x_i++) { /* allow one extra point to compensate for row shift */
- out->push_back(d2p{off_x + x_i * pitch_h, off_y + y_i * pitch_v});
- }
-
- for (long long int x_i=0; x_i<points_x+1; x_i++) { /* allow one extra point to compensate for row shift */
- out->push_back(d2p{off_x + (x_i - 0.5) * pitch_h, off_y + (y_i + 1) * pitch_v});
- }
- }
-
- return out;
-}
-
-vector<d2p> *gerbolyze::sample_squaregrid(double w, double h, double center_distance) {
- /* offset of first square to make sure the entire area is covered. We use slightly larger values here to avoid
- * corner cases during clipping in the voronoi map generator. The inaccuracies this causes at the edges are
- * negligible. */
- double off_x = 0.5 * center_distance;
- double off_y = 0.5 * center_distance;
-
- long long int points_x = ceil(w / center_distance);
- long long int points_y = ceil(h / center_distance);
-
- vector<d2p> *out = new vector<d2p>();
- out->reserve(points_x * points_y);
-
- for (long long int y_i=0; y_i<points_y; y_i++) {
- for (long long int x_i=0; x_i<points_x; x_i++) {
- out->push_back({off_x + x_i*center_distance, off_y + y_i*center_distance});
- }
- }
-
- return out;
-}
-