在两个矩形周围绘制PolygonHotSpot? [英] Draw PolygonHotSpot around two Rectangles?

问题描述

让我们说我有两个Rectangle的坐标，它们可以彼此相邻或在它们之间留有间隔.我需要在两个矩形周围绘制一个PolygonHotSpot(因此它将仅覆盖两个矩形及其之间的空间).我发现我必须在整个多边形周围而不是在每个矩形周围(对单个矩形都适用)按顺时针方向赋予坐标.

Lets say that I've got the coordinates of two Rectangles, they could be right next to each other or have space between them. I need to draw a PolygonHotSpot around the two rectangles (so it will only cover the two rectangles and the space between them). I've come to find that I have to give the coordinates a clockwise order around the entire polygon, rather than around each rectangle (which works fine for a single rectangle).

因此给定了一个坐标列表，是否有一种方法可以使它们按顺序排列，以使我的PolygonHotSpot中没有任何间隙?

So given a list of coordinates, is there a way to get them into the order that I need for there to not be any gaps in my PolygonHotSpot?

推荐答案

您要两者中的Union:

    Dim R1 As New Rectangle(20, 20, 100, 100)
    Dim R2 As New Rectangle(200, 200, 100, 100)
    Dim R3 = Rectangle.Union(R1, R2) '//R3 = 20, 20, 280, 280

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