How to get sub-circles from orignal circle

1 view (last 30 days)
Hi,
I have circle with diameter 1, I use below code:
meshgrid(x,y)
Fig,surf(x,y,z,'facecolor','interp','edgecolor',none);view(2)
xlim([0 1]),ylim([0 1))
colorbar;colormap(hot);
Now I want plot a circle
figure2. Keep original circle diameter 0-0.39 from bottom as it is, and fill rest of the original area with black color
Figure3: Keep original circle diameter 0.39~1 (up or top) as it is, and fill rest of the original area with black color
Figure4: Keep original circle diameter 0~63 from left as it is, and fill rest of the original area with black color
Figure5: Keep original circel diameter 0.4~1 to right as it is,and fill rest of the original area with black color
Kindly some help to do this.
  4 Comments
Mekala balaji
Mekala balaji on 24 Mar 2019
Keep the original color in the specified diameter range, and fill the outside this range as black,
Mekala balaji
Mekala balaji on 24 Mar 2019
N = 256;
c = colormap(jet(N));
th = linspace(0, 2*pi, N);
r = 0:0.5:1;
[TH,R] = meshgrid(th,r);
[X,Y] = pol2cart(TH,R);
C = bsxfun(@times,(X + Y),th);
figure(1)
circled.jpg
surf(X,Y,C)
view([0 90])
axis square
grid off
I want keep the circle as it is as above in 0.39~0.6 diameter range, and fill rest of the area in black color

Sign in to comment.

Accepted Answer

Image Analyst
Image Analyst on 24 Mar 2019
See this color wheel example. Adapt as needed.
Capture.PNG

More Answers (0)

Categories

Find more on Shifting and Sorting Matrices in Help Center and File Exchange

Products


Release

R2016a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!