Put a call into UpdatePlot(handles) in each control that you want to update your plot in:
function UpdatePlot(handles)
% Get the slider values
userLength = get(handles.sldLength, 'Value');
width = get(handles.sldWidth, 'Value');
radius = get(handles.sldRadius, 'Value');
% Get the one listbox item that is selected:
selectedItem = get(handles.listbox1, 'Value');
% Do stuff based on which listbox item they selected.
if selectedItem == 1
% Do circle plot.....
elseif selectedItem == 2
% Do rectangle plot.....
end
% Now here are the callbacks to the listbox and 3 slider controls
% showing how you would call UpdatePlot().
function listbox1_Callback(hObject, eventdata, handles)
UpdatePlot(handles);
function sldLength_Callback(hObject, eventdata, handles)
UpdatePlot(handles);
function sldWidth_Callback(hObject, eventdata, handles)
UpdatePlot(handles);
function sldRadius_Callback(hObject, eventdata, handles)
UpdatePlot(handles);
