--- /dev/null
+/*
+ * svrt is the ``Synthetic Visual Reasoning Test'', an image
+ * generator for evaluating classification performance of machine
+ * learning systems, humans and primates.
+ *
+ * Copyright (c) 2009 Idiap Research Institute, http://www.idiap.ch/
+ * Written by Francois Fleuret <francois.fleuret@idiap.ch>
+ *
+ * This file is part of svrt.
+ *
+ * svrt is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * svrt 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with selector. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "vision_problem_14.h"
+#include "shape.h"
+
+VisionProblem_14::VisionProblem_14() { }
+
+void VisionProblem_14::sample_shapes_positions_aligned(int nb_shapes, int *xs, int *ys) {
+ for(int n = 0; n < nb_shapes - 1; n++) {
+ xs[n] = int(drand48() * (Vignette::width - part_size + 1)) + part_size/2;
+ ys[n] = int(drand48() * (Vignette::height - part_size + 1)) + part_size/2;
+ }
+ scalar_t alpha = drand48();
+ xs[nb_shapes - 1] = int(alpha * xs[0] + (1 - alpha) * xs[1]);
+ ys[nb_shapes - 1] = int(alpha * ys[0] + (1 - alpha) * ys[1]);
+}
+
+void VisionProblem_14::sample_shapes_positions_uniformly(int nb_shapes, int *xs, int *ys) {
+ for(int n = 0; n < nb_shapes; n++) {
+ xs[n] = int(drand48() * (Vignette::width - part_size + 1)) + part_size/2;
+ ys[n] = int(drand48() * (Vignette::height - part_size + 1)) + part_size/2;
+ }
+}
+
+int VisionProblem_14::there_is_an_alignment(scalar_t dist_threshold, int nb_shapes, int *xs, int *ys) {
+ for(int a = 0; a < nb_shapes; a++) {
+ for(int b = 0; b < nb_shapes; b++) {
+ for(int c = 0; c < b; c++) {
+ if(a != b && a != c) {
+ if(point_in_band(scalar_t(xs[a]), scalar_t(ys[a]),
+ scalar_t(xs[b]), scalar_t(ys[b]),
+ scalar_t(xs[c]), scalar_t(ys[c]),
+ dist_threshold)) return 1;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+
+void VisionProblem_14::generate(int label, Vignette *vignette) {
+ int nb_shapes = 3;
+ int xs[nb_shapes], ys[nb_shapes];
+ int error;
+
+ do {
+ if(label) {
+ sample_shapes_positions_aligned(nb_shapes, xs, ys);
+ } else {
+ do {
+ sample_shapes_positions_uniformly(nb_shapes, xs, ys);
+ } while(there_is_an_alignment(Vignette::width/20, 3, xs, ys));
+ }
+
+ vignette->clear();
+
+ Shape shape;
+
+ error = 0;
+ for(int n = 0; n < nb_shapes; n++) {
+ if(n == 0) {
+ shape.randomize(part_size/2, hole_size/2);
+ }
+ error |= shape.overwrites(vignette, xs[n], ys[n]);
+ shape.draw(vignette, xs[n], ys[n]);
+ }
+ } while(error);
+}