How to get sub-circles from orignal circle

조회 수: 1 (최근 30일)
Mekala balaji
Mekala balaji 2019년 3월 22일
답변: Image Analyst 2019년 3월 24일
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.
  댓글 수: 4
Mekala balaji
Mekala balaji 2019년 3월 24일
Keep the original color in the specified diameter range, and fill the outside this range as black,
Mekala balaji
Mekala balaji 2019년 3월 24일
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

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Image Analyst
Image Analyst 2019년 3월 24일
See this color wheel example. Adapt as needed.
Capture.PNG

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