Matlab Gui: Dragging lines on plot using mouse (2024)

uifig = uifigure();

ax = uiaxes(uifig);

plot(ax,sin(0:.1:12))

h = images.roi.Line(ax,'Position',[20 20;ylim(ax)]',... % start at x=20

'Label','P1max', ...

'LabelAlpha',.35, ...

'InteractionsAllowed','translate', ...

'MarkerSize',1, ...

'Color',[0 .7 0] ,...

'StripeColor','w');

% Update title when line is moving

addlistener(h, 'MovingROI', @lineMovingFcn)

function lineMovingFcn(obj,event)

% Update title with new x position of the line

ax = ancestor(obj,'axes');

ax.Title.String = sprintf('x = %.3f',event.CurrentPosition(1));

end

% Create the figure and axes

fig = figure;

ax = axes(fig);

% Plot a sample signal

t = 0:0.01:10;

signal = sin(2*pi*t);

plot(ax, t, signal);

hold(ax, 'on');

% Create the slider

slider_wf = uicontrol(fig, 'Style', 'slider', ...

'Min', 0, 'Max', 10, 'Value', 5, ...

'Position', [75 2 440 20], ...

'SliderStep', [0.01, 0.01], ...

'Callback', @slider_Callback);

function slider_Callback(hObject, eventdata, handles)

% Callback function to update the line position

persistent lineHandle

% Create the line if it doesn't exist yet

if isempty(lineHandle) || ~isvalid(lineHandle)

lineHandle = xline(gca, 5, 'r-', 'LineWidth', 1);

end

% Update the line position based on the slider value

slider_value = get(hObject,'Value');

lineHandle.Value = slider_value;

end