凸包 · D3.js API 中文手冊

> [Wiki](Home) ? [[API Reference]] ? [[Geometry]] ? **Hull Geom** <a name="hull" href="Hull-Geom#hull">#</a> d3.geom.hull() <a href="http://bl.ocks.org/mbostock/4341699"><img src="img/thumbnail.png" width="202"></a> Create a new hull layout with the default *x*- and *y*-accessors. <a name="_hull" href="Hull-Geom#_hull">#</a> hull(vertices) Returns the convex hull for the specified *vertices* array, using the current x- and y-coordinate accessors. The returned convex hull is represented as an array containing a subset of the input vertices, arranged in counterclockwise order (for consistency with [polygon.clip](Polygon-Geom#clip)). Assumes the *vertices* array is greater than three in length. If *vertices* is of length <= 3, returns []. <a name="x" href="Hull-Geom#x">#</a> hull.x([x]) If *x* is specified, sets the x-coordinate accessor. If *x* is not specified, returns the current x-coordinate accessor, which defaults to: ```js function(d) { return d[0]; } ``` <a name="y" href="Hull-Geom#y">#</a> hull.y([y]) If *y* is specified, sets the y-coordinate accessor. If *y* is not specified, returns the current y-coordinate accessor, which defaults to: ```js function(d) { return d[1]; } ```