MATLAB Answers


Filling area between more curves

Asked by Anezka Koterova on 15 Sep 2019
Latest activity Commented on by Anezka Koterova on 17 Sep 2019
I am trying to colour the area between more curves (given also in implicite form) with one unbounded and transparent colour. This is example, how it should looks like (except from the red vertical line y=2):
And I have a same problem with planes. Is there any function to fill this "multiarea" or area between more surfaces?
I can only use fill, but it does not create comprehensive and transparent area between more curves.
Thank you.


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1 Answer

Answer by Bruno Luong
on 15 Sep 2019
 Accepted Answer

Change accordingly to suit your need.
tt = linspace(0,2*pi,361);
xy = [2*cos(tt);
close all
hold on
plot(xy(1,:), xy(2,:), 'k');
plot([-4 4],[0 0], 'k');
plot([-4 0],[-4 4], 'k');
plot([1 1],[-4 4], 'r');
b = [0; 1]'*xy >= 0 &...
[2; -1]'*xy >= [2; -1]'*[-2;0] ;
xyfill = [[-2;0] xy(:,b) [0; 4]];
patch('xdata',xyfill(1,:),'ydata',xyfill(2,:),'facecolor','b','facealpha',0.2, 'linewidth', 2);
axis equal


Do You have an idea, how to do this for area bounded by surfaces?
Thank You.
Possibly, here is a simple example
Thank You. I will explore that.

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