D3 Transitions - Easing Function
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A single circle animates horizontally across an 800-by-100 SVG canvas, moving between x-coordinates of 100 and 700 each time the "Update data" button is clicked. A dropdown menu lists all available D3 easing functions (e.g., `d3.easeCubicOut`), and the selected function dictates the circle’s motion profile during the 750-millisecond transition. The example uses D3 v7.8.5’s selection API, `.transition().duration().ease()`, to tween the circle’s `cx` attribute, with a semi-transparent purple fill and no additional data source.
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