Fork of Smiley Face Part II
This example renders a full-screen smiley face using React and D3’s `arc` generator. The face is drawn with SVG circles for the head, eyes, and stroke outline, while the mouth is created from a D3 arc path with awkward angular parameters. The code imports React and `arc` from d3, computes layout coordinates from window dimensions, and uses ReactDOM to mount an app component that outputs the SVG. The visualization directly embeds D3’s arc API inside a React rendering pipeline, demonstrating a hybrid approach to static SVG composition.