Matlab查找图形对象是否存在于给定坐标上 [英] Matlab finding if graphic object exist on figure on given coordinates

问题描述

我需要找到一种方法来检查我创建的补丁对象(例如矩形)是否存在于我指定的某些X-Y坐标内.例如，我使用以下代码:

I need to find a way to check if a patch object I created (a rectangle for example) exists within certain X-Y coordinates I specify. As an example, I am using the following code:

a = figure
b = axes('Parent',a,'Xlim',[0 100],'Ylim',[0 100])
x = [0 10 10 0];
y = [0 0 10 10];
patch(x,y,'red')

现在，我想知道图中的坐标x = 6和y = 3是否存在对象.有办法检查吗?

Now I would like to know if there is an object in the figure in the point with coordinates x=6 and y=3. Is there a way to check this?

推荐答案

使用findall()和inpolygon函数.

Use the findall () and inpolygon function.

 hPatches = findall(b, 'type', 'patch');
 tgtX = 5; tgtY = 7;
 inside = zeros (1, numel(hPatches));
 for patchCtr = 1:numel(hPatches)
     vert = get (hPatches(patchCtr), 'Vertices');
     inside(patchCtr) = inpolygon (tgtX, tgtY, vert(:,1), vert(:,2));
 end

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