Plot a column from an array by clicking on an image of that array
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Say I have an array an image of which I can display:
ti = magic(32);
figure(1);
imagesc(ti);
I want to be able to click on a pixel in the image frame and have a plot updated to show the column from the original array that includes that pixel.
while 1
figure(1);
[x,y] = ginput;
figure(2);
plot(ti(:,round(x)));
end
Except that this doesn't work.
What I really want is a tool in an image figure which plots the columnar profile if I click the tool on the image.
Thanks.
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採用された回答
Image Analyst
2023 年 1 月 13 日
Try this:
ti = magic(32);
subplot(2, 1, 1);
imshow(ti, [], 'InitialMagnification', 1000)
g = gcf;
g.WindowState = 'maximized';
buttonText = 'OK';
while strcmpi(buttonText, 'OK')
subplot(2, 1, 1);
promptMessage = sprintf('Click a point');
titleBarCaption = 'Continue?';
buttonText = questdlg(promptMessage, titleBarCaption, 'OK', 'Quit', 'OK');
if contains(buttonText, 'Quit', 'IgnoreCase', true)
return; % or break or continue.
end
[x, y] = ginput(1);
column = round(x);
thisColumn = ti(:, column);
subplot(2, 1, 2);
plot(thisColumn, 'b-', 'LineWidth', 2);
grid on;
caption = sprintf('Column %d', column);
title(caption, 'FontSize', 16)
xlabel('Row', 'FontSize', 16)
ylabel('Value', 'FontSize', 16)
end
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