MATLAB: Options for displaying data by clicking on a marker in a plot

markerplot

Hello,

is there an option for displaying data in addition to the usual x and y data by clicking on a marker in a plot?

I've plottet the coordinates of broken particles in the xy-plane and I want to display their ID in addition to their respective coordinates. The ID should be disyplayed in the same window as the x and y value (see attachement).

Best Answer

For R2018b and later:

X = rand(10,1);
Y = rand(10,1);
IDs = randi(100,10,1);
s = scatter(X, Y, 'x');
s.DataTipTemplate.DataTipRows(3) = dataTipTextRow('ID', IDs);

For R2018a and earlier, something similar to this:

X = rand(10,1);
Y = rand(10,1);
IDs = randi(100,10,1);
f = figure;
scatter(X, Y, 'x');
dcm = datacursormode(f);
dcm.UpdateFcn = {@customDataTip, IDs};
function txt = customDataTip(~, eventData, IDs)
    s = eventData.Target;
    pos = eventData.Position;
    ID = IDs(s.XData == pos(1) & s.YData == pos(2));
    valueFormat = ' \color[rgb]{0 0.6 1}\bf';
    removeValueFormat = '\color[rgb]{.25 .25 .25}\rm';
    txt = {['X',[valueFormat num2str(pos(1)) removeValueFormat]],...
           ['Y',[valueFormat num2str(pos(2)) removeValueFormat]],...
           ['ID',[valueFormat num2str(ID) removeValueFormat]]};
end

Related Solutions

MATLAB: Tabbed plots removes the title and labels

The issue is because you are not setting the xlabel,ylabel,title to particular axis or figure. These values are automatically set for the figure that is declared recently.Instead of declaring all the figures before ,you could modify your code as below

figure_handles(1).mainfig = figure;
figure_handles(1).tabgroup = uitabgroup;
% Fig1, tab1
newtab = uitab(figure_handles(1).tabgroup, 'Title', "tab1");
ax1 = axes(newtab); 
plot(ax1,rand(1,100)*10,rand(1,100)*10);
title('FIG 1')
xlabel('X label')
ylabel('Y label')
% Fig1, tab2 with legend
newtab = uitab(figure_handles(1).tabgroup, 'Title', "tab2");
ax3 = axes(newtab);
plot(ax3,rand(1,100)*10,rand(1,100)*10);
hold on
plot(ax3,rand(1,100)*10,rand(1,100)*10);
legend('1', '2')
title('FIG 1')
xlabel('X label')
ylabel('Y label')
hold off
figure_handles(2).mainfig = figure;
figure_handles(2).tabgroup = uitabgroup;
% Fig2, tab1
newtab = uitab(figure_handles(2).tabgroup, 'Title', "tab1");
ax = axes(newtab); 
plot(ax,rand(1,100)*10,rand(1,100)*10);
title('FIG 2')
xlabel('X label')
ylabel('Y label')

MATLAB: Live line plotting over a surface/mesh/imagesc plot.

Here's a functional demo that uses the WindowButtonMotionFcn property of a figure to capture the mouse position which is used to detect the closest (x,y) coordinates to the mouse within the axes. It continually updates a set of crosshairs that display the coordinates and updates two subplots showing the values along the selected row and column.

See inline comments for details.

Create the data and set up the plot

% Create data
data = peaks(1000); 
% Plot data in main axis
ax(1) = subplot(4,1,[1,2]); 
imagesc(ax(1), data)
ax(1).YDir = 'Normal'; 
axis(ax(1),'equal')
axis(ax(1),'tight') %required!
ax(1).Parent.WindowState = 'Maximized';  % maximize figure
ax(1).Toolbar.Visible = 'off'; % otherwise, toolbar may hide axis title
xlabel(ax(1), 'x axis lable')
ylabel(ax(1), 'y axis lable')
title(ax(1), 'Data')
% Set up cross hairs at axis edges
gobj(1) = xline(min(xlim(ax(1))), 'k-');
gobj(2) = yline(min(ylim(ax(1))), 'k-');
% Set up subplot 2; do all formatting here
ax(2) = subplot(4,1,3); 
gobj(3) = plot(ax(2), 1:size(data,2), nan(1,size(data,2)), '-ko', 'MarkerSize', 4);
xlabel(ax(2), 'x index')
ylabel(ax(2), 'x value')
axis(ax(2), 'tight')
% Set up subplot 3; do all formatting here
ax(3) = subplot(4,1,4); 
gobj(4) =  plot(ax(3), 1:size(data,1), nan(1,size(data,1)), '-ko', 'MarkerSize', 4);
xlabel(ax(3), 'y index')
ylabel(ax(3), 'y value')
axis(ax(3), 'tight')
% After values are set above, assign windowbuttonmotion fcn
set(ax(1).Parent,'windowbuttonmotionfcn', {@mouseMove, data, ax, gobj});

Define the WindowButtonMotionFcn

function mouseMove(~, ~, data, ax, gobj)
% gobj(1) is xline
% gobj(2) is yline
% gobj(3) is subplot 2 line
% gobj(4) is subplot 3 line
% ax is a vector of subplot handles from top to bottom
% data is the imagesc data
% Get mouse coordinate, round to nearest integer.
C = ax(1).CurrentPoint;
x = round(C(1,1));
y = round(C(1,2));
% If mouse isn't on axis, do nothing.
if x < ax(1).XLim(1) || x > ax(1).XLim(2) || y < ax(1).YLim(1) || y > ax(1).YLim(2) 
    return
end
% Update crosshairs
gobj(1).Value = x; 
gobj(1).Label = x; 
gobj(2).Value = y; 
gobj(2).Label = y; 
% Update main title
% title(ax(1), sprintf('(x,y) = (%d, %d)', x, y)); 
% Update x-subplot
gobj(3).YData = data(x,:); 
title(ax(2), sprintf('X = %d', x))
% Update y-subplot
gobj(4).YData = data(:,y); 
title(ax(3), sprintf('Y = %d', y))
end

Addendum: turn on/off interactivity

Press the left mouse button to turn on interactivity and the right mouse button to pause it so that the crosshairs and subplots do not update with mouse motion.

%% Add this section to the first block of code where the figure is created.
% Remove the windowbuttonmotionfcn in that section. 
WindowButtonMotionFcnInput = {@mouseMove, data, ax, gobj}; 
set(ax(1).Parent,'windowbuttondownfcn', {@startStopMouseMove, WindowButtonMotionFcnInput})
%% This function responds to mouse clicks and either assigns 
% or removes the windowbuttonmotionfcn
function startStopMouseMove(hobj,~,WindowButtonMotionFcnInput)
buttonID = hobj.SelectionType; 
switch buttonID
    case 'normal'  %left mouse button
        % Start interactivity
        set(hobj,'windowbuttonmotionfcn', WindowButtonMotionFcnInput);
    case 'alt'     % right mouse button
        % Stop interactivity
        set(hobj,'windowbuttonmotionfcn', []);
end
end

Best Answer

Related Solutions

MATLAB: Tabbed plots removes the title and labels

MATLAB: Live line plotting over a surface/mesh/imagesc plot.

Related Question