Elliposid number of faces

Hello can somebody help me to understand how i can change the number of faces of an ellipsoid with a slider in app designer

[Matt J]

An ellipsoid is a curved surface. It shouldn't have any faces.

[HANZU OLIVIU-MIHAI]

I mean

Answer 1

[Matt J]

You would just access the Value property of the slider in its callback. Then use that value to replot the ellipsoid.

[HANZU OLIVIU-MIHAI]

Can you show me how ?

[Matt J]

Show me the code for your slider callback and I might be able to tell you how to modify it.

[HANZU OLIVIU-MIHAI]

[Matt J]

Please insert it as code, rather than image. Otherwise I can't copy/paste.

Also, where is your code that plots the ellipsoid.

[HANZU OLIVIU-MIHAI]

classdef app2 < matlab.apps.AppBase
    
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure                  matlab.ui.Figure
        NSlider                   matlab.ui.control.Slider
        NSliderLabel              matlab.ui.control.Label
        AparentaDropDown          matlab.ui.control.DropDown
        AparentaDropDownLabel     matlab.ui.control.Label
        DesenareStergereCheckBox  matlab.ui.control.CheckBox
        zrEditField               matlab.ui.control.EditField
        zrEditFieldLabel          matlab.ui.control.Label
        yrEditField               matlab.ui.control.EditField
        yrEditFieldLabel          matlab.ui.control.Label
        xrEditField               matlab.ui.control.EditField
        xrEditFieldLabel          matlab.ui.control.Label
        zcEditField               matlab.ui.control.EditField
        zcEditFieldLabel          matlab.ui.control.Label
        ycEditField               matlab.ui.control.EditField
        ycEditFieldLabel          matlab.ui.control.Label
        xcEditField               matlab.ui.control.EditField
        xcEditFieldLabel          matlab.ui.control.Label
        UIAxes                    matlab.ui.control.UIAxes
    end
    
    
    properties (Access = private)
        xc = []; xr = [];
        yc = []; yr = [];
        zc = []; zr = [];
    end
    
    
    % Callbacks that handle component events
    methods (Access = private)
        
        % Value changed function: DesenareStergereCheckBox
        function DesenareStergereCheckBoxValueChanged(app, event)
            
            
            app.xc = app.xcEditField.Value;
            app.yc = app.ycEditField.Value;
            app.zc = app.zcEditField.Value;
            app.xr = app.xrEditField.Value;
            app.yr = app.yrEditField.Value; 
            app.zr = app.zrEditField.Value; 
            
            [X,Y,Z] = ellipsoid(str2num(app.xc),str2num(app.yc),str2num(app.zc),str2num(app.xr),str2num(app.yr),str2num(app.zr));
            axis equal 
            
            if app.DesenareStergereCheckBox.Value 
                set(mesh(app.UIAxes,X,Y,Z),'visible','on')
            else
                set(mesh(app.UIAxes,X,Y,Z),'visible','off')
            end
        end
        
        % Value changed function: AparentaDropDown
        function AparentaDropDownValueChanged(app, event)
            
            [X,Y,Z] = ellipsoid(str2num(app.xc),str2num(app.yc),str2num(app.zc),str2num(app.xr),str2num(app.yr),str2num(app.zr));
            axis equal 
            
            switch app.AparentaDropDown.Value
                case 'mesh'
                    (mesh(app.UIAxes,X,Y,Z));
                case 'surf'
                    (surf(app.UIAxes,X,Y,Z));
                case 'surface'
                    (surface(app.UIAxes,X,Y,Z));
                case 'contour'
                    (contour(app.UIAxes,X,Y,Z));  
            end
        end
        
        % Value changed function: NSlider
        function NSliderValueChanged(app, event)
            value = app.NSlider.Value;
            
        end
    end
    
    % Component initialization
    methods (Access = private)
        
        % Create UIFigure and components
        function createComponents(app)
            
            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 804 517];
            app.UIFigure.Name = 'MATLAB App';
            
            % Create UIAxes
            app.UIAxes = uiaxes(app.UIFigure);
            title(app.UIAxes, 'Ellipsoid')
            xlabel(app.UIAxes, 'X')
            ylabel(app.UIAxes, 'Y')
            zlabel(app.UIAxes, 'Z')
            app.UIAxes.FontSize = 14;
            app.UIAxes.Position = [41 149 410 284];
            
            % Create xcEditFieldLabel
            app.xcEditFieldLabel = uilabel(app.UIFigure);
            app.xcEditFieldLabel.Position = [499 375 25 22];
            app.xcEditFieldLabel.Text = 'xc';
            
            % Create xcEditField
            app.xcEditField = uieditfield(app.UIFigure, 'text');
            app.xcEditField.Position = [539 375 70 22];
            app.xcEditField.Value = '0';
            
            % Create ycEditFieldLabel
            app.ycEditFieldLabel = uilabel(app.UIFigure);
            app.ycEditFieldLabel.Position = [499 323 25 22];
            app.ycEditFieldLabel.Text = 'yc';
            
            % Create ycEditField
            app.ycEditField = uieditfield(app.UIFigure, 'text');
            app.ycEditField.Position = [539 323 70 22];
            app.ycEditField.Value = '0';
            
            % Create zcEditFieldLabel
            app.zcEditFieldLabel = uilabel(app.UIFigure);
            app.zcEditFieldLabel.Position = [499 271 25 22];
            app.zcEditFieldLabel.Text = 'zc';
            
            % Create zcEditField
            app.zcEditField = uieditfield(app.UIFigure, 'text');
            app.zcEditField.Position = [539 271 70 22];
            app.zcEditField.Value = '0';
            
            % Create xrEditFieldLabel
            app.xrEditFieldLabel = uilabel(app.UIFigure);
            app.xrEditFieldLabel.Position = [649 375 25 22];
            app.xrEditFieldLabel.Text = 'xr';
            
            % Create xrEditField
            app.xrEditField = uieditfield(app.UIFigure, 'text');
            app.xrEditField.Position = [689 375 70 22];
            app.xrEditField.Value = '0';
            
            % Create yrEditFieldLabel
            app.yrEditFieldLabel = uilabel(app.UIFigure);
            app.yrEditFieldLabel.Position = [649 323 25 22];
            app.yrEditFieldLabel.Text = 'yr';
            
            % Create yrEditField
            app.yrEditField = uieditfield(app.UIFigure, 'text');
            app.yrEditField.Position = [689 323 70 22];
            app.yrEditField.Value = '0';
            
            % Create zrEditFieldLabel
            app.zrEditFieldLabel = uilabel(app.UIFigure);
            app.zrEditFieldLabel.Position = [649 270 25 22];
            app.zrEditFieldLabel.Text = 'zr';
            
            % Create zrEditField
            app.zrEditField = uieditfield(app.UIFigure, 'text');
            app.zrEditField.Position = [689 270 70 22];
            app.zrEditField.Value = '0';
            
            % Create DesenareStergereCheckBox
            app.DesenareStergereCheckBox = uicheckbox(app.UIFigure);
            app.DesenareStergereCheckBox.ValueChangedFcn = createCallbackFcn(app, @DesenareStergereCheckBoxValueChanged, true);
            app.DesenareStergereCheckBox.Text = 'Desenare / Stergere';
            app.DesenareStergereCheckBox.FontWeight = 'bold';
            app.DesenareStergereCheckBox.FontColor = [0.149 0.149 0.149];
            app.DesenareStergereCheckBox.Position = [499 161 135 33];
            
            % Create AparentaDropDownLabel
            app.AparentaDropDownLabel = uilabel(app.UIFigure);
            app.AparentaDropDownLabel.HorizontalAlignment = 'right';
            app.AparentaDropDownLabel.FontSize = 20;
            app.AparentaDropDownLabel.FontWeight = 'bold';
            app.AparentaDropDownLabel.FontColor = [0.149 0.149 0.149];
            app.AparentaDropDownLabel.Position = [499 214 99 26];
            app.AparentaDropDownLabel.Text = 'Aparenta:';
            
            % Create AparentaDropDown
            app.AparentaDropDown = uidropdown(app.UIFigure);
            app.AparentaDropDown.Items = {'mesh', 'surf', 'surface', 'contour'};
            app.AparentaDropDown.ValueChangedFcn = createCallbackFcn(app, @AparentaDropDownValueChanged, true);
            app.AparentaDropDown.FontSize = 18;
            app.AparentaDropDown.FontColor = [0.149 0.149 0.149];
            app.AparentaDropDown.BackgroundColor = [0.9412 0.9412 0.9412];
            app.AparentaDropDown.Position = [613 216 100 23];
            app.AparentaDropDown.Value = 'mesh';
            
            % Create NSliderLabel
            app.NSliderLabel = uilabel(app.UIFigure);
            app.NSliderLabel.Position = [530 128 14 22];
            app.NSliderLabel.Text = 'N';
            
            % Create NSlider
            app.NSlider = uislider(app.UIFigure);
            app.NSlider.Limits = [20 80];
            app.NSlider.MajorTicks = [20 30 40 50 60 70 80];
            app.NSlider.ValueChangedFcn = createCallbackFcn(app, @NSliderValueChanged, true);
            app.NSlider.MinorTicks = [];
            app.NSlider.Position = [556 137 194 3];
            app.NSlider.Value = 20;
            
            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
    
    % App creation and deletion
    methods (Access = public)
        
        % Construct app
        function app = app2
            
            % Create UIFigure and 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

[Matt J]

The callback should look like this:

    function NSliderValueChanged(app, event)
    
            N = app.NSlider.Value;
            ellipsoid(xc,yc,zc,xr,yr,zr,N);
          
   end

[HANZU OLIVIU-MIHAI]

I get this error

[Matt J]

We can't see what you did.

[HANZU OLIVIU-MIHAI]

% Value changed function: NSlider

function NSliderValueChanged(app, event)

N = app.NSlider.Value;

ellipsoid(app.xc,app.yc,app.zc,app.xr,app.yr,app.zr,app.N);

end

[Matt J]

Don't know what app.N is here. Presumably you meant

ellipsoid(app.xc,app.yc,app.zc,app.xr,app.yr,app.zr, N);