Determining point is within polygon or outside.

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Ramesh Bala 2018-7-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412069-determining-point-is-within-polygon-or-outside

评论： Adam Danz 2018-7-25

so far I have coded a profile and a user input to plot the points if inside or outside. any improvement to the code is appreciable

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Ramesh Bala 2018-7-25

编辑：Walter Roberson 2018-7-25

在 MATLAB Online 中打开

%polygonal coordinates
close all
clear
clc
xv = [0 0 0 20  20 0 10 20 20 20 20 30 30 50 50 20 30 40 50]
yv = [0 0 50 10  0 0  0 0  0 10 50 50 10  10 0   0 0   0 0 ]
% plotting the points as polygonas
figure (1)
plot(xv, yv,'-')
hold on
%square axis
grid on
axis([-10 60 -10 60])
%specifying the N coordinate
% xq = [22 45];
% yq = [25 35];
[X] = ginput(2);
[X] = round(X);
xq = X(1:2);
yq = X(3:4);
%polygon and point plotting
[in,on] = inpolygon(xq,yq,xv,yv);
%Determine the number of points lying inside or on the edge of the polygon area.
   numel(xq(in))
%Determine the number of points lying on the edge of the polygon area.
numel(xq(on))
%Determine the number of points lying outside the polygon area (not inside or on the edge).
numel(xq(~in))
%Plot the polygon and the query points. Display the points inside the polygon with a red plus. Display the points outside the polygon with a blue circle.
figure (1)
plot(xv,yv) % polygon
axis([-10 60 -10 60])
hold on
plot(xq(in),yq(in),'r+') % points inside
plot(xq(~in),yq(~in),'bo') % points outside
hold off

Ramesh Bala 2018-7-25

Thanks für the reply. I actually tried using inpolygon for the code ,it didn't worked well as I'm selecting only 2 coords as user input .I think it works with random points. So here im trying to print a statement saying ginputs are within profile or outside profile using inpolygon Function. Actually the present code shows the points in and out in colours. I need to attach a print statement to it .