Fork of Smiley Face Part III
This example demonstrates a smiley face built with React and D3, rendered as an SVG graphic with a pink circular head, blue outline, two eyes, and a mouth defined by an arc path. The code imports the `arc` function from D3 and uses it to compute the mouth’s curved shape, while React handles the component structure and JSX for the SVG elements. Position values like eye offsets and radii are stored as constants, and the visualization is centered at 480,250 on a 960×500 canvas.