how to color the area under the line??
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ahmed allaheani
le 10 Déc 2016
Réponse apportée : Nirav Sharda
le 13 Déc 2016
i am using polar coordinates to plot an antenna coverage area shape. i got the code as following:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/158841/image.png)
and i got the result :
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/158842/image.png)
i just need help at [ how can i shad or color the area under the curve ????]
2 commentaires
Image Analyst
le 10 Déc 2016
It's not clear what area you're referring to. If you mean between the line and the center, then it seems that some points are "inside" 3 curves or 4 curves. So do you count that area 3 times or 4 times or just once?
Réponse acceptée
Nirav Sharda
le 13 Déc 2016
You can use the patch function here. I picked up 2 adjacent points and the center and created a patch inside a for loop. Also I used 'polar' instead of 'polarplot', because patch cannot be used for polaraxes.
r = [-18,-23,-29,-30,-30,-27,-24,-22,-32,-32,-30,-30,-24,-22,-25,-15,-20,-22,-27];
theta = linspace(-180,180,length(r));
polar(theta,r);
[x y]= pol2cart(theta,r);
for i = 1:length(r)-1
x1 = [x(i) x(i+1) 0];
y1 = [y(i) y(i+1) 0];
patch(x1,y1,'r','EdgeColor','none');
end
% This can be optional. I added this so that the numbers 10 and 20 are
% visible
alpha(.1);
I hope this helps.
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