From 496dcbd9960677db246a84bcd3e4b4230ee28e0a Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Thu, 16 Sep 2021 16:47:05 +0200
Subject: Initial commit.

---
 soft_spheres.cpp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 soft_spheres.cpp

(limited to 'soft_spheres.cpp')

diff --git a/soft_spheres.cpp b/soft_spheres.cpp
new file mode 100644
index 0000000..a71a472
--- /dev/null
+++ b/soft_spheres.cpp
@@ -0,0 +1,44 @@
+#include "animation.hpp"
+
+int main(int argc, char* argv[]) {
+  const unsigned n = 12;
+
+  unsigned N = 1200;
+  double R = 0.024;
+  double ε = 0.01;
+  unsigned steps = 1e6;
+  double β = 1;
+
+  initializeAnimation(argc, argv);
+
+  Rng r;
+
+  Model<2, SoftSphere<2, n>> m(N, 2 * R * 1.25);
+
+  for (unsigned i = 0; i < N; i++) {
+    Position<2> x = {r.uniform(0.0, 1.0), r.uniform(0.0, 1.0)};
+    double rad = pow(r.uniform(pow(2.219, -2), 1.0), -0.5) * R / 2.219;
+    m.insert(SoftSphere<2, n>(x, rad));
+  }
+
+  for (unsigned i = 0; i < steps * N; i++) {
+    SoftSphere<2, n>& s = r.pick(m.particles);
+    Vector<2> Δx;
+    for (double& Δxi : Δx) {
+      Δxi = r.variate<double, std::normal_distribution>(0, ε);
+    }
+
+    m.metropolis(β, s, Δx, r);
+
+    SoftSphere<2, n>& s1 = r.pick(m.particles);
+    SoftSphere<2, n>& s2 = r.pick(m.particles);
+    
+    m.swap(β, s1, s2, r);
+
+    if (i % (N * 3) == 0) {
+      draw(m);
+    }
+  }
+
+  return 0;
+}
-- 
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