How can I fill with color a odd flower in a cartesian o polar coordinates?
3 views (last 30 days)
Show older comments
% In rectangular coordinates
theta=linspace(0,2*pi,200);
radius=cos(5*theta);
x=radius.*(cos(theta));
y=radius.*(sin(theta));
fill(x,y,'b') % when matlab run, only fill with color not odd flowers
axis('square')
% In polar coordinates
p=Polar(theta,radius,'-b')
patch(get(ph,'XData'), get(ph,'YData'), 'b')
1 Comment
Image Analyst
on 8 Jul 2015
I fixed your formating, and am attaching the screenshot you forgot to include:
Accepted Answer
bio lim
on 8 Jul 2015
Edited: bio lim
on 8 Jul 2015
As a matter of fact, you are filling with color. What you are filling are the small polygons as shown in the figure below.
If we look closely, we can see the small polygons that are filled with blue colour.
The fill() and patch() works perfectly when you are dealing with even number of petals. However, even for even petals, if you zoom in closely at the center, you can see that there are regions which are not filled.
I think the problem with your code is that when the radius takes less than 0 value, the polygons occur. So a simple solution would be:
theta=linspace(0,2*pi,200);
radius=cos(5*theta);
radius(radius <= 0) = 0;
x=radius.*(cos(theta));
y=radius.*(sin(theta));
fill(x,y, 'b');
axis('square')
Here is the updated graph.
0 Comments
More Answers (0)
See Also
Categories
Find more on Polar Plots in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!