1 files changed, 139 insertions, 0 deletions
diff --git a/examples/ising_animation.cpp b/examples/ising_animation.cpp
new file mode 100644
index 0000000..2104e91
--- /dev/null
+++ b/examples/ising_animation.cpp
@@ -0,0 +1,139 @@
+
+#include <getopt.h>
+#include <iostream>
+#include <chrono>
+
+#include <GL/glut.h>
+
+#include <wolff/models/ising.hpp>
+#include <wolff/finite_states.hpp>
+
+#include <wolff.hpp>
+
+using namespace wolff;
+
+class draw_ising : public measurement<ising_t, ising_t> {
+  private:
+    unsigned int frame_skip;
+    v_t C;
+  public:
+    draw_ising(const system<ising_t, ising_t>& S, unsigned int window_size, unsigned int frame_skip, int argc, char *argv[]) : frame_skip(frame_skip){
+      glutInit(&argc, argv);
+      glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+      glutInitWindowSize(window_size, window_size);
+      glutCreateWindow("wolff");
+      glClearColor(0.0,0.0,0.0,0.0);
+      glMatrixMode(GL_PROJECTION);
+      glLoadIdentity();
+      gluOrtho2D(0.0, S.G.L, 0.0, S.G.L);
+    }
+
+    void pre_cluster(N_t, N_t, const system<ising_t, ising_t>& S, v_t, const ising_t&) {
+      glClear(GL_COLOR_BUFFER_BIT);
+      for (v_t i = 0; i < pow(S.G.L, 2); i++) {
+        if (S.s[i].x == S.s0.x) {
+          glColor3f(0.0, 0.0, 0.0);
+        } else {
+          glColor3f(1.0, 1.0, 1.0);
+        }
+        glRecti(i / S.G.L, i % S.G.L, (i / S.G.L) + 1, (i % S.G.L) + 1);
+      }
+      glFlush();
+      C = 0;
+    }
+
+    void plain_bond_visited(const system<ising_t, ising_t>&, v_t, const ising_t&, v_t, double dE) {}
+
+    void ghost_bond_visited(const system<ising_t, ising_t>&, v_t, const ising_t& s_old, const ising_t& s_new, double dE) {}
+
+    void plain_site_transformed(const system<ising_t, ising_t>& S, v_t i, const ising_t&) {
+      glColor3f(1.0, 0.0, 0.0);
+      glRecti(i / S.G.L, i % S.G.L, (i / S.G.L) + 1, (i % S.G.L) + 1);
+      C++;
+      if (C % frame_skip == 0) {
+        glFlush();
+      }
+    }
+
+    void ghost_site_transformed(const system<ising_t, ising_t>&, const ising_t&) {}
+
+    void post_cluster(N_t, N_t, const system<ising_t, ising_t>&) {}
+};
+
+int main(int argc, char *argv[]) {
+
+  // set defaults
+  N_t N = (N_t)1e4;
+  D_t D = 2;
+  L_t L = 128;
+  double T = 2.26918531421;
+  double H = 0.0;
+  unsigned int window_size = 512;
+  unsigned int frame_skip = 1;
+
+  int opt;
+
+  // take command line arguments
+  while ((opt = getopt(argc, argv, "N:D:L:T:H:w:f:")) != -1) {
+    switch (opt) {
+    case 'N': // number of steps
+      N = (N_t)atof(optarg);
+      break;
+    case 'D': // dimension
+      D = atoi(optarg);
+      break;
+    case 'L': // linear size
+      L = atoi(optarg);
+      break;
+    case 'T': // temperature
+      T = atof(optarg);
+      break;
+    case 'H': // external field
+      H = atof(optarg);
+      break;
+    case 'w':
+      window_size = atoi(optarg);
+      break;
+    case 'f':
+      frame_skip = atoi(optarg);
+      break;
+    default:
+      exit(EXIT_FAILURE);
+    }
+  }
+
+  // define the spin-spin coupling
+  std::function <double(const ising_t&, const ising_t&)> Z = [] (const ising_t& s1, const ising_t& s2) -> double {
+    return (double)(s1 * s2);
+  };
+
+  // define the spin-field coupling
+  std::function <double(const ising_t&)> B = [=] (const ising_t& s) -> double {
+    return H * s;
+  };
+
+  // initialize the lattice
+  graph G(D, L);
+
+  // initialize the system
+  system<ising_t, ising_t> S(G, T, Z, B);
+
+  // define function that generates self-inverse rotations
+  std::function <ising_t(std::mt19937&, const system<ising_t, ising_t>&, v_t)> gen_R = [] (std::mt19937&, const system<ising_t, ising_t>&, v_t) -> ising_t {
+    return ising_t(true);
+  };
+
+  // initailze the measurement object
+  draw_ising A(S, window_size, frame_skip, argc, argv);
+
+  // initialize the random number generator
+  auto seed = std::chrono::high_resolution_clock::now().time_since_epoch().count();
+  std::mt19937 rng{seed};
+
+  // run wolff N times
+  S.run_wolff(N, gen_R, A, rng);
+
+  // exit
+  return 0;
+}
+