Hi Lorenzo, from what I understand, you want to join together line segments on a figure in a way that you can control as you go. Below, I've put together a piece of code to help you start with this. Remember, this is just a basic setup for merging lines, and you might need to tweak it a bit to make it work just right for you.
function merge_plot_pieces
% Sample plot pieces
x = linspace(0,pi,100);
y = sin(x); z = cos(x/2);
% Define segments
segments = { x(1:12), y(1:12); x(19:25), y(19:25); x(45:67), y(45:67); x(90:end), y(90:end); x(4:19), z(4:19); x(40:88), z(40:88)};
colors = ['b', 'b', 'b', 'b', 'r', 'r'];
% Initialize global variables to store merged coordinates and last color
global mergedX;
global mergedY;
global lastColor;
mergedX = [];
mergedY = [];
lastColor = ''; % Empty indicates no color selected yet
% Plot segments
fig = figure; hold on; grid on;
for i = 1:size(segments, 1)
h = plot(segments{i,1}, segments{i,2}, colors(i));
set(h, 'ButtonDownFcn', @plotClicked, 'UserData', colors(i)); % Store color in UserData
end
% Set up a key press function to reset the merging process
set(fig, 'KeyPressFcn', @resetMerging);
end
function plotClicked(src, ~)
% This function is called when a plot segment is clicked
global mergedX;
global mergedY;
global lastColor;
currentColor = src.UserData; % Get the color of the clicked plot from UserData
% Check if the color matches the last clicked color or if it's the first click
if isempty(lastColor) || strcmp(lastColor, currentColor)
% Append clicked segment data to global variables
mergedX = [mergedX, src.XData];
mergedY = [mergedY, src.YData];
lastColor = currentColor; % Update lastColor
% Plot the merged trajectory
plot(mergedX, mergedY, currentColor, 'LineWidth', 2, 'Tag', 'mergedTrajectory');
legend off
else
% If the colors don't match, do not merge and optionally alert the user
disp('Cannot merge: Selected segment is of a different color.');
end
end
function resetMerging(~, ~)
% This function resets the merging process to allow starting with a new color without clearing the last merged trajectory
global mergedX;
global mergedY;
global lastColor;
% Reset the global variables without clearing the last merged trajectory
mergedX = [];
mergedY = [];
lastColor = '';
disp('Merging process reset. You can now start merging a new color.');
end
I hope this helps.
