Drop Down and geoshow

Question

Gogu 2020-12-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/697905-drop-down-and-geoshow

评论： Gogu 2020-12-21

采纳的回答： Mario Malic

在 MATLAB Online 中打开

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

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Answer 1

Mario Malic 2020-12-20

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/697905-drop-down-and-geoshow#answer_580475

编辑：Mario Malic 2020-12-20

在 MATLAB Online 中打开

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