How to say the third selected point lies within the created geometry or not?
1 回表示 (過去 30 日間)
古いコメントを表示
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 件のコメント
Walter Roberson
2018 年 7 月 25 日
Question was continued at https://www.mathworks.com/matlabcentral/answers/412069-determining-point-is-within-polygon-or-outside
Adam Danz
2018 年 7 月 25 日
Kaleesh, I'm continuing your other thread (link above) here because this topic seems to be more relevant to the problems you're having.
採用された回答
Adam Danz
2018 年 7 月 24 日
編集済み: Adam Danz
2018 年 7 月 25 日
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.
5 件のコメント
その他の回答 (0 件)
参考
カテゴリ
Help Center および File Exchange で Line Plots についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!