Background of a scatter plot

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Bran
Bran 2016-6-28
回答： Chad Greene 2016-6-28
I would like to set the background of an animated scatter plot. At the moment I am animating the plot in the following way: M = min(A1(:)); N = max(A1(:)); P = min(B1(:)); Q = max(B1(:)); a = [1:24]'; hold on
pause; for i = 1:10
A = DD(1:2:end,i);
B = DD(2:2:end,i);
h = scatter(A,B,[],a,'filled') colormap(jet) dx = 0.009; dy = 0.009; b = num2str(a); c = cellstr(b); text(A+dx, B+dy, c);
ylim([P Q]);
xlim([M N]);
xlabel('no on text')
ylabel('Overall score')
pause(2) hold off
I would like several rectangles plotted in the background for example one rectangle from x= 12 to x = 20 and y = 10 to y = 15 , I did try something with the patch command but the colours were very bright and I wasnt sure how to make them transparent
Any suggesting would be great Thank you in advance

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回答（1 个）

Chad Greene
Chad Greene 2016-6-28
Bran, you've provided lots of code, but we can't run it. If your question is specific to your code, make sure you provide code we can run. If your question is about how to make a rectangle, one way is to use the rectangle command:
rectangle('position',[12 10 8 5],'facecolor',[0.53 0.43 0.79])
Above I used rgb('dull brown') to get RGB values of a non-bright color.
If you need to set the transparency of a patch object, you can do so like this:
h = patch([12 20 20 12 12],[10 10 15 15 10],[0.53 0.43 0.29]);
set(h,'facealpha',0.5)

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