diff --git a/src/main.rs b/src/main.rs
index 1359506..157910a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -464,6 +464,15 @@ impl DelaunayDemo {
 			};
 			let edge_0 = edge.0.get().as_f32();
 			let edge_1 = edge.1.get().as_f32();
+
+			if
+				edge_0.x < 0.0 || edge_0.x > screen_width()
+				|| edge_0.y < 0.0 || edge_0.y > screen_height()
+				|| edge_1.x < 0.0 || edge_1.x > screen_width()
+				|| edge_1.y < 0.0 || edge_1.y > screen_height()
+			{
+				continue; //don't draw container nodes
+			}
 			draw_line(
 				edge_0.x,
 				edge_0.y,