MATLAB: Drop Down and geoshow

drop downgeoshowMATLABshapefile

Hello !

I have an interface (GUI) that includes: Drop Down, Axes

In Drop Down I have 2 options: Map1, Map2

If you select Map1, it should display map1.shp; if you select Map2, it should display map2.shp

At startup, map1.shp is displayed

Problem: If I select Map2, it displays map2.shp correctly, but if I select Map1, nothing happens.

function startupFcn(app)
                 s=shaperead('C:\Users\Vostro\Desktop\App_Maps\Map1\map1.shp');
                 geoshow(app.UIAxes,s);
         end
         % Value changed function: SelecteazaHartaDropDown
         function SelecteazaHartaDropDownValueChanged(app, event)
                
                 value = app.SelecteazaHartaDropDown.Value;
                
                 switch value
                         case 'Harta1'
                                 s=shaperead('C:\Users\Vostro\Desktop\App_Maps\Map1\map1.shp');
                                 geoshow(app.UIAxes,s);
                                
                         case 'Harta2'
                                 s=shaperead('C:\Users\Vostro\Desktop\App_Maps\Map2\map2.shp');
                                 geoshow(app.UIAxes,s);
                                
                 end
         end

Best Answer

I am not seeing the issue with your code, but it could be improved a bit. Your initial value on the dropdown is the first one - 'Harta1', and if you opened the dropdown menu and pressed it again callback won't be executed, but that's not an issue because you have already loaded Harta1 in the startupFcn.

Better way to do it is by having an intial option that tells you to choose the map, as a result, you don't have to have the startupFcn anymore.

% Value changed function: SelecteazaHartaDropDown
function SelecteazaHartaDropDownValueChanged(app, event)
     value = app.SelecteazaHartaDropDown.Value;
     switch value
         case 'Please select the map'
             cla(app.UIAxes)
         case 'Harta1'
             s=shaperead('C:\Users\Vostro\Desktop\App_Maps\Map1\map1.shp');
             geoshow(app.UIAxes,s);
         case 'Harta2'
             s=shaperead('C:\Users\Vostro\Desktop\App_Maps\Map2\map2.shp');
             geoshow(app.UIAxes,s);
     end
end

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MATLAB: How to use Mapping Toolbox functions such as “plotm” in App Designer

Unfortunately, there is currently no way to directly call Mapping Toolbox functions such as "plotm" on an App Designer UIAxes object. To work around this, use one of the following techniques based on your specific use case.

1) Create a "geoaxes" object as a child of the app's UIFigure.

load coastlines
% Create "geoaxes" object
fig = uifigure;
ax = geoaxes(fig);
geoplot(ax, coastlat, coastlon);

2) Copy the original axes as a child of the app's UIFigure.

load coastlines
% Construct map in regular axes

ax1 = worldmap('world');
plotm(coastlat,coastlon)
% Reparent to axes in "uifigure"
fig2 = uifigure;
copyobj(ax1, fig2);
% Remove original axes

fig1 = ax1.Parent;
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If you do not want to remove the original figure but also do not want to display it, then you can change its visibility as follows:

% Hide original axes
fig1 = ax1.Parent;
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3) Replot the projected (x, y) map data on the app's UIAxes.

load coastlines
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MATLAB: Using Matlab App Designer with 2 Dependent Pop Up Menus

You can do this by using a callback on changinge the value in your first drop down. All the magic is done in

function DropDown1ValueChanged(app, event)

Here you go:

classdef app1 < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure          matlab.ui.Figure
        DropDown2_2Label  matlab.ui.control.Label
        DropDown2_2       matlab.ui.control.DropDown
        DropDown1Label    matlab.ui.control.Label
        DropDown1         matlab.ui.control.DropDown
    end
    methods (Access = private)
        % Value changed function: DropDown1
        function DropDown1ValueChanged(app, event)
            value = app.DropDown1.Value;
            switch value
                case "California"
                    app.DropDown2_2.Items = {'San Diego', 'Sacaramento', 'Irvine'};
                case "Texas"
                    app.DropDown2_2.Items = {'Austin', 'Dallas', 'Houston'};
            end
                    
        end
    end
    % App initialization and construction
    methods (Access = private)
        % Create UIFigure and components
        function createComponents(app)
            % Create UIFigure
            app.UIFigure = uifigure;
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'UI Figure';
            % Create DropDown2_2Label
            app.DropDown2_2Label = uilabel(app.UIFigure);
            app.DropDown2_2Label.HorizontalAlignment = 'right';
            app.DropDown2_2Label.Position = [370 287 69 22];
            app.DropDown2_2Label.Text = 'DropDown2';
            % Create DropDown2_2
            app.DropDown2_2 = uidropdown(app.UIFigure);
            app.DropDown2_2.Items = {'San Diego', 'Sacaramento', 'Irvine'};
            app.DropDown2_2.Position = [454 287 100 22];
            app.DropDown2_2.Value = 'San Diego';
            % Create DropDown1Label
            app.DropDown1Label = uilabel(app.UIFigure);
            app.DropDown1Label.HorizontalAlignment = 'right';
            app.DropDown1Label.Position = [97 287 69 22];
            app.DropDown1Label.Text = 'DropDown1';
            % Create DropDown1
            app.DropDown1 = uidropdown(app.UIFigure);
            app.DropDown1.Items = {'California', 'Texas'};
            app.DropDown1.ValueChangedFcn = createCallbackFcn(app, @DropDown1ValueChanged, true);
            app.DropDown1.Position = [181 287 100 22];
            app.DropDown1.Value = 'California';
        end
    end
    methods (Access = public)
        % Construct app
        function app = app1
            % Create and configure components
            createComponents(app)
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            if nargout == 0
                clear app
            end
        end
        % Code that executes before app deletion
        function delete(app)
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

Greetins Stefan

Best Answer

Related Solutions

MATLAB: How to use Mapping Toolbox functions such as “plotm” in App Designer

MATLAB: Using Matlab App Designer with 2 Dependent Pop Up Menus

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