Matlab:查找由点(x，y)包围的区域 [英] Matlab: Find area enclosed by points (x,y)

问题描述

我有8个点在二维空间中创建了一个八边形多边形的轮廓.我需要找到这些点周围的区域，但是如何使用matlab做到这一点呢?

I've got 8 points that create the outline of an eight-sided polygon in two-dimensional space. I need to find the area enclosed be these points, but how do I do that using matlab?

八个点(x，y)包含在8x2矩阵B中.

The eight points (x,y) are contained in the 8x2 matrix B.

B = [ 260 455;
    1187 467;
    1325 605;
    1342 1533;
    1207 1675
    251 1690;
    107 1547;
    116 593];

通过绘制从第1行到第2行的点，然后从第2行到第3行的点的直线来创建多边形，依此类推...

The polygon is created by drawing straight lines from the point which is row 1 to row 2, then row 2 to row 3 and so on...

推荐答案

您可以使用 polyarea :

You can use polyarea:

ar = polyarea(B(:, 1), B(:, 2));

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