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.

---
 animation.hpp | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 animation.hpp

(limited to 'animation.hpp')

diff --git a/animation.hpp b/animation.hpp
new file mode 100644
index 0000000..26b3d55
--- /dev/null
+++ b/animation.hpp
@@ -0,0 +1,39 @@
+#pragma once
+
+#include "spheres.hpp"
+#include <GL/glut.h>
+
+void draw(const Sphere<2>& s, std::array<double, 3> color = {0, 0, 0},
+                unsigned nPoints = 20) {
+  glColor3d(color[0], color[1], color[2]);
+  glBegin(GL_POLYGON);
+  for (unsigned i = 0; i < nPoints; i++) {
+    glVertex2d(s.x(0) + s.r * cos(2 * i * M_PI / nPoints), s.x(1) + s.r * sin(2 * i * M_PI / nPoints));
+  }
+  glEnd();
+}
+
+void initializeAnimation(int argc, char** argv, unsigned window_size = 1000) {
+  glutInit(&argc, argv);
+  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+  glutInitWindowSize(window_size, window_size);
+  glutCreateWindow("spheres");
+  glClearColor(0.0, 0.0, 0.0, 0.0);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  gluOrtho2D(0, 1.0, 0, 1.0);
+  glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+}
+
+template <Particle<2> T> void draw(const Model<2, T>& m) {
+  glClear(GL_COLOR_BUFFER_BIT);
+  for (const Sphere<2>& p : m.particles) {
+    draw(p);
+    if (p.intersectsBoundary()) {
+      for (Vector<2> Δy : {(Vector<2>){1,0}, {-1,0}, {0,1}, {0,-1}, {-1,1}, {1,1}, {1,-1},{-1,-1}}) {
+        draw({(Vector<2>)p.x + Δy, p.r});
+      }
+    }
+  }
+  glFlush();
+}
-- 
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