Implement unit circle example

`unit_circle.sh` generates a animated GIF of the circle states between
p=1 and p=3.

1 files changed, 1 insertions, 1 deletions

diff --git a/example.cc b/example.cc
index 294c86a..8e4eee8 100644
--- a/example.cc
+++ b/example.cc
@@ -64,7 +64,7 @@ void generate_minkowski_voronoi(
 				];
 
 				if ( *minimal_distance <= 5 ) {
-					return imgen::color(0, 0, 0);
+					return imgen::black();
 				} else {
 					return std::get<2>(nearest);
 				}