How to use the mouse to select and identify a line on a plot

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Andrew 2013-7-26

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评论： Jan 2022-2-25

Hi,

I have an analysis that I am performing repeatedly. There are two multi-channel data sources. These sources have different and possibly varying identification numbers. It is important that data source A and B are correctly identified.

I would like to be able to include a user interactive check where a channel from source A and B are plotted together. The user is then asked for instance to pick or highlight the line from data set A. This is then used to identify A and B. If necessary a swap of data sets is then performed prior to launching into the full analysis.

I am new to GUI programming and using callbacks etc in Matlab and would appreciate any comments or suggestions on this.

Regards

Andrew Sims

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回答（2 个）

Jan 2013-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/83231-how-to-use-the-mouse-to-select-and-identify-a-line-on-a-plot#answer_92853

编辑：Jan 2013-7-26

在 MATLAB Online 中打开

You can use the ButtonDownFcn of the line objects:

function smallTest
axes('NextPlot', 'add')
H(1) = plot(1:10, rand(1, 10), 'r');
H(2) = plot(1:10, rand(1, 10), 'b');
set(H, 'ButtonDownFcn', {@LineSelected, H})
function LineSelected(ObjectH, EventData, H)
set(ObjectH, 'LineWidth', 2.5);
set(H(H ~= ObjectH), 'LineWidth', 0.5);

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Claus Andersson 2022-2-24

Jan, thanks for the very helpful solution above - is there a way to 'inline' this LineWidth change in the 'set' call to avoid having the function LineSelected.

I would like to have the figure stay interactive, even after the function has stopped running.