Update.

[universe.git] / generate.cc

diff --git a/generate.cc b/generate.cc
index e41fbe3..28115b1 100644 (file)
--- a/generate.cc
+++ b/generate.cc
@@ -31,10 +31,170 @@ using namespace std;
 
 void generate_png(Universe *universe, scalar_t scale, FILE *file) {
   CanvasCairo canvas(scale, universe->width(), universe->height());
+  canvas.set_line_width(2.0);
   universe->draw(&canvas);
   canvas.write_png(file);
 }
 
 int main(int argc, char **argv) {
+  scalar_t world_width = 400;
+  scalar_t world_height = 400;
+  scalar_t grab_start_x = world_width * 0.5;
+  scalar_t grab_start_y = world_height * 0.75;
 
+  Universe *universe;
+  Polygon *grabbed_polygon;
+
+  if(argc < 2 || argc > 3) {
+    cerr << argv[0] << " <nb pairs to generate> [<dir> [<seed>]]" << endl;
+    exit(1);
+  }
+
+  int nb_pairs = atoi(argv[1]);
+
+  char dir[1024] = "/tmp/";
+
+  if(argc > 2) {
+    strncpy(dir, argv[2], sizeof(dir) / sizeof(char) - 1);
+  }
+
+  if(argc > 3) {
+    srand48(atoi(argv[1]));
+  }
+
+  universe = new Universe(10, world_width, world_height);
+
+  for(int n = 0; n < nb_pairs; n++) {
+    cout << "Example " << n << endl;
+
+    do {
+      universe->clear();
+
+      const int nb_attempts_max = 100;
+      int nb_attempts = 0;
+
+      for(int u = 0; u < 10; u++) {
+        Polygon *pol = 0;
+
+        nb_attempts = 0;
+
+        do {
+          scalar_t square_size = 80;
+
+          scalar_t x[] = {
+            - square_size * 0.5,
+            + square_size * 0.5,
+            + square_size * 0.5,
+            - square_size * 0.5,
+          };
+
+          scalar_t y[] = {
+            - square_size * 0.5,
+            - square_size * 0.5,
+            + square_size * 0.5,
+            + square_size * 0.5,
+          };
+
+          scalar_t delta = square_size / sqrt(2.0);
+          scalar_t object_center_x = delta + (world_width - 2 * delta) * drand48();
+          scalar_t object_center_y = delta + (world_height - 2 * delta) * drand48();
+          scalar_t red, green, blue;
+          red = 0.90;
+          green = red;
+          blue = red;
+          delete pol;
+          pol = new Polygon(0.5,
+                            red, green, blue,
+                            x, y, sizeof(x)/sizeof(scalar_t));
+          pol->set_position(object_center_x, object_center_y, M_PI * 2 * drand48());
+          pol->set_speed(0, 0, 0);
+          universe->initialize_polygon(pol);
+          nb_attempts++;
+        } while(nb_attempts < nb_attempts_max && universe->collide(pol));
+
+        if(nb_attempts == nb_attempts_max) {
+          delete pol;
+          u = 0;
+          universe->clear();
+          nb_attempts = 0;
+        } else {
+          universe->add_polygon(pol);
+        }
+      }
+
+      grabbed_polygon = universe->pick_polygon(grab_start_x, grab_start_y);
+    } while(!grabbed_polygon);
+
+    const scalar_t scaling = 0.16;
+
+    CanvasCairo grab_trace(scaling, world_width, world_height);
+
+    {
+      char buffer[1024];
+      sprintf(buffer, "%s/dyn_%06d_world_0.png", dir, n);
+      FILE *file = fopen(buffer, "w");
+      generate_png(universe, scaling, file);
+      fclose(file);
+    }
+
+    scalar_t grab_relative_x = grabbed_polygon->relative_x(grab_start_x, grab_start_y);
+    scalar_t grab_relative_y = grabbed_polygon->relative_y(grab_start_x, grab_start_y);
+    // scalar_t grab_previous_x = grab_start_x, grab_previous_y = grab_start_y;
+
+    {
+      int n = 36;
+      scalar_t xp[n], yp[n];
+      for(int k = 0; k < n; k++) {
+        scalar_t radius = 1/scaling;
+        scalar_t alpha = 2 * M_PI * scalar_t(k) / scalar_t(n);
+        xp[k] = grab_start_x + radius * cos(alpha);
+        yp[k] = grab_start_y + radius * sin(alpha);
+      }
+      grab_trace.set_drawing_color(0.0, 0.0, 0.0);
+      grab_trace.set_line_width(1.0);
+      grab_trace.draw_polygon(1, n, xp, yp);
+    }
+
+    const int nb_iterations = 250;
+    scalar_t dt = 0.1;
+    for(int i = 0; i < nb_iterations; i++) {
+      scalar_t xf = grabbed_polygon->absolute_x(grab_relative_x, grab_relative_y);
+      scalar_t yf = grabbed_polygon->absolute_y(grab_relative_x, grab_relative_y);
+      grabbed_polygon->apply_force(dt, xf, yf, 0.0, -1.0);
+      universe->update(dt);
+
+      /*
+        {
+        scalar_t xp[2], yp[2];
+        xp[0] = grab_previous_x;
+        yp[0] = grab_previous_y;
+        xp[1] = xf;
+        yp[1] = yf;
+        grab_previous_x = xf;
+        grab_previous_y = yf;
+
+        grab_trace.set_drawing_color(0.0, 0.0, 0.0);
+        grab_trace.draw_polygon(1, 2, xp, yp);
+        }
+      */
+    }
+
+    {
+      char buffer[1024];
+      sprintf(buffer, "%s/dyn_%06d_world_1.png", dir, n);
+      FILE *file = fopen(buffer, "w");
+      generate_png(universe, scaling, file);
+      fclose(file);
+    }
+
+    {
+      char buffer[1024];
+      sprintf(buffer, "%s/dyn_%06d_grab.png", dir, n);
+      FILE *file = fopen(buffer, "w");
+      grab_trace.write_png(file);
+      fclose(file);
+    }
+  }
+
+  delete universe;
 }