How to delete all lines using line()
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Hello everyone,
I have a simple question: is it possible to delete all lines (I mean, using the function line()) and not the rest of plots in an axes gui?
I am making a cursor and I am using the function line() to draw it. I have a little problem in my code, so I thought delete all my lines and then draw the lines that I need.
I can't use in my case: if ishandle(cursor) delete(cursor) end
Any advice?
Thank you in advance
采纳的回答
Image Analyst
2016-2-10
You have to keep track of the handles to the lines as you create them, because I think curves made by plot() might also be identified as lines by findobj(). If it's in a loop, then
for k = 1 : whatever
hLines(k) = line(.....
end
% Delete them
delete(hLines);
Or run this demo:
t=linspace(0,6*pi, 1000);
f = 8 * exp(-0.25*t).*sin(t - 2);
plot(t, f);
grid on;
hold on;
% Make lines.
hLines(1)=line([2,8], [3,-4], 'Color', 'r', 'LineWidth', 2)
hLines(2)=line([10,16], [-2,4], 'Color', 'r', 'LineWidth', 2)
% Clear lines.
uiwait(msgbox('Click OK to clear the lines'));
delete(hLines);
3 个评论
pem.cristina
2016-2-11
Image Analyst
2016-2-11
编辑：Image Analyst
2016-2-14
I don't know why you call your line handles "cursors" or why you need to check if they're handles or not. You know they must be or you never would have assigned them.
Here's another function I've used:
%========================================================
% Erases all lines from the axes control with handle "h".
function ClearLinesFromAxes(h)
%fprintf('In ClearLinesFromAxes...\n');
axesHandlesToChildObjects = findobj(h, 'Type', 'line');
if ~isempty(axesHandlesToChildObjects)
delete(axesHandlesToChildObjects);
end
%fprintf('Leaving ClearLinesFromAxes.\n');
return; % from ClearLinesFromAxes
pem.cristina
2016-2-14
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