inpolygon command for multiple areas2 (not using mapping toolbox)

Question

tafteh 2012-12-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55714-inpolygon-command-for-multiple-areas2-not-using-mapping-toolbox

Hi all,

In part of my code I am intrested in realizing whether a point = (x,y) is withing multiple areas or not. Here, each area is a polygon (simply a square) that have the coordination of its center locater which I can calcuate the corner points.

I learnt that by using "inpolygon" comman I can realize whether my point is withing that polygon(or on its edge). Hoever, I am interested to recognize what area whose the point is withing.

i.e. I have area1, area2 and area3.

I set following variables:

% definig all the areas coordination xv = [1 2 2 1 1 NaN 4 4 5 5 4 NaN 6 6 7 7 6]; yv = [0 0 3 3 0 NaN 1 2 2 1 1 NaN 4 5 5 4 4]; x = 1.5; y = 3; in = inpolygon(x,y,xv,yv); I can find that my point is within one of the three defined areas (Here is within the area1). But how can I say the point is within what area specifically?

I also tried this: http://www.mathworks.com/matlabcentral/fileexchange/7187-inpolygons but I do not have the "mpping toolbox" hence I can not use the inpolygons function.

I would appreciate if get some help in this,

Best