Fork of Circles with D3
This example shows a collection of semi-transparent circles with varied colors and sizes arranged across a fixed SVG canvas. The visualization uses D3’s data join pattern to bind an array of circle objects—each containing x, y, radius, and fill properties—to SVG circle elements. The code employs method chaining with `select`, `data`, and `join` to create and update the circles, setting attributes like `cx`, `cy`, `r`, `fill`, and `opacity` directly from the data. The background is styled light green, and the circles overlap with a fixed opacity value.