This example shows a donut-style pie chart built as a React component, with four slices colored along a gradient from orange to deep pink using `d3.interpolateRgb`. It relies on `d3.pie()` to compute the slice angles and `d3.arc()` with both inner and outer radii to generate SVG `<path>` elements. The chart is rendered inside a `<g>` group translated to the center of an SVG canvas, with a commented-out companion component that would draw color swatches via `d3.interpolateRgb` for testing.