不规则八边形边上绘制柱形图

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不规则八边形边上绘制柱形图

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Last edited Nov 21, 2023

Created on Nov 21, 2023

This example draws an irregular octagon on an SVG canvas over a background image, then places a blue rotated rectangle at the midpoint of each edge to represent a bar chart. The rectangle’s rotation angle is computed from the edge’s slope using `Math.atan2`, and each rectangle is positioned via the `transform` attribute with `rotate`. The code uses D3 v6 to append SVG elements, including a polygon for the octagon and rects for the bars, with hardcoded vertex coordinates and a fixed rectangle width and height.

AI-generated description

A bare minimum HTML page demonstrating use of CSS and JavaScript.

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