This example renders a red octagon centered in an SVG canvas and draws individual bar charts along each of its eight edges. The bars are positioned at the midpoint of every polygon side and rotated to align with the edge’s orientation. Using D3 v6, the code computes the octagon’s vertices with a custom polygonPoints function, derives side midpoints, and appends SVG rect elements for each bar. It also demonstrates stacked bars via d3.stack(), though the primary visible output uses a fixed array of heights. The bars are styled with red fills and rotated around their base points.