How to say the third selected point lies within the created geometry or not?
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Ramesh Bala
el 24 de Jul. de 2018
Comentada: Ramesh Bala
el 26 de Jul. de 2018
close all
clc
base_x = [0 50 50 20 0 0]
base_y = [0 0 10 10 10 0 ]
roof_x = [ 0 0 20 20 30 30]
roof_y =[ 10 50 10 50 50 10]
figure
plot(base_x, base_y,'-')
hold on
plot(roof_x, roof_y,'-')
axis([0 50 0 50])
grid on
[X,Y]=meshgrid(1:11);
[x] = ginput(2);
[x] = round(x);
fprintf ('the a1 coordinate value is %d,\n' , x(1,1));
fprintf ('the b1 coordinate value is %d ,\n' , x(1,2));
fprintf ('the a2 coordinate value is %d,\n' , x(2,1));
fprintf ('the b2 coordinate value is %d ,\n' , x(2,2));
How to say the third selected points a1,b1 a2,b2 lies within the created geometry ( base,roof) or not?
4 comentarios
Walter Roberson
el 25 de Jul. de 2018
Question was continued at https://www.mathworks.com/matlabcentral/answers/412069-determining-point-is-within-polygon-or-outside
Adam Danz
el 25 de Jul. de 2018
Kaleesh, I'm continuing your other thread (link above) here because this topic seems to be more relevant to the problems you're having.
Respuesta aceptada
Adam Danz
el 24 de Jul. de 2018
Editada: Adam Danz
el 25 de Jul. de 2018
If I understand your question correctly, you're trying to determine if a coordinate (x,y) lies within a polygon.
First try matlab's inpolygon().
Another way to achieve that is by "ray casting". The idea is to draw a line from the (x,y) coordinate and extend it rightward until it passes all of the possible polygon edges. Then count the number of times that ray intersects with an edge of the polygon. If that number is non-zero and odd, then the coordinate (x,y) is within the polygon.
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