How draw lines between two coordinates saved with mouse's click in UIaxes (appdesigner)?

Hello all,

Someone help me please. I want draw lines between two coordinates (with mouse's click) that are showed on a UIaxes with scatter. I worked this in Appdesigner. The

sequence that i have in mind is:

1. Click in button to draw.
2. Click first point showed with scatter command in UIaxe.
3. Click second point showed with scatter command in the same UIaxe.
4. Right click to finish draw.

Answer 1

[Kiran Felix Robert]

Hi Ivan,

The UIAxes of App Designer does not have a callback functionality but the WindowButtonDown Callback function can be used. To get the mouse coordinates with respect to the axes created, the get function can be used with the ‘CurrentPoint’ and referencing the Axes handle (Refer to this Answer).

The following functions shows an example implementation of the callbacks for your application. Here I have used a separate ‘Finish’ button to plot the line, you can also use the SelectionType, if required for a ‘’right-mouse-click” button functionality

% Window button down function: UIFigure 
function UIFigureWindowButtonDown(app, event) 
    P = get(app.UIAxes,'CurrentPoint'); 
    if(length(app.X)<2) 
        app.X =[app.X P(1,1)]; 
        app.Y = [app.Y P(1,2)];
        scatter(app.UIAxes,app.X,app.Y);                 
    end 
end 
% Button pushed function: FinishButton 
function FinishButtonPushed(app, event) 
  line(app.UIAxes,app.X,app.Y) 
  app.X = []; 
  app.Y = []; 
end 

Kiran Felix Robert

[Iván Silva]

Thanks a lot Kiran.

[Ryan Lees]

What are the X and Y in the app.X and app.Y here?