[Scilab-users] Refresh plot from Slider

[Tan Chin Luh]

Hi,

first of all, the handles to the sliders are wrong, you were using the 
text handles instead of the sliders handles in both pushbutton and 
slider callback.

secondly you need to be careful on the sampling, with 0.01, u could only 
plot sine wave
with < 50 Hz. (nyquist)

finally remember to delete the previous plot before redrawing. infact it 
is not the best way to delete and plot and redraw it everytime 
especially you want to use the slider to plot the graph, be ready for a 
lagging effect.

hope this helps.

rgds,
CL

On 07-Sep-14 12:32 PM, tanthiamhuat wrote:
> referring to the below weblink
> http://www.equalis.com/blogpost/731635/Scilab-Tips?tag=guibuilder+graphic+user+interface
>
> How do we refresh the plot with the slider? I try to put in the code for the
> Plot button, but it does not work.
> see code below, thanks.
>
> // This GUI file is generated by guibuilder version 2.2
> //////////
> f=figure('figure_position',[375,60],'figure_size',[656,604],'auto_resize','on','background',[33],'figure_name','Graphic
> window number %d');
> //////////
> delmenu(f.figure_id,gettext('File'))
> delmenu(f.figure_id,gettext('?'))
> delmenu(f.figure_id,gettext('Tools'))
> toolbar(f.figure_id,'off')
> handles.dummy = 0;
> handles.sliderAmp=uicontrol(f,'unit','normalized','BackgroundColor',[0.8,0.8,0.8],'Enable','on','FontAngle','normal','FontName','helvetica','FontSize',[12],'FontUnits','points','FontWeight','normal','ForegroundColor',[0,0,0],'HorizontalAlignment','center','ListboxTop',[],'Max',[20],'Min',[0],'Position',[0.0932716,0.8253968,0.23,0.0335714],'Relief','flat','SliderStep',[10,10],'String','1','Style','slider','Value',[10],'VerticalAlignment','middle','Visible','on','Tag','sliderAmp','Callback','sliderAmp_callback(handles)')
> handles.sliderFreq=uicontrol(f,'unit','normalized','BackgroundColor',[0.8,0.8,0.8],'Enable','on','FontAngle','normal','FontName','helvetica','FontSize',[12],'FontUnits','points','FontWeight','normal','ForegroundColor',[0,0,0],'HorizontalAlignment','center','ListboxTop',[],'Max',[100],'Min',[0],'Position',[0.0932716,0.7097502,0.23,0.0335714],'Relief','flat','SliderStep',[20,20],'String','1','Style','slider','Value',[50],'VerticalAlignment','middle','Visible','on','Tag','sliderFreq','Callback','sliderFreq_callback(handles)')
> handles.Amp=uicontrol(f,'unit','normalized','BackgroundColor',[0.8,0.8,0.8],'Enable','on','FontAngle','normal','FontName','helvetica','FontSize',[12],'FontUnits','points','FontWeight','normal','ForegroundColor',[0,0,0],'HorizontalAlignment','center','ListboxTop',[],'Max',[100],'Min',[0],'Position',[0.1548765,0.7891473,0.0964815,0.0324031],'Relief','flat','SliderStep',[0.01,0.1],'String','Amplitude','Style','text','Value',[20],'VerticalAlignment','middle','Visible','on','Tag','Amp','Callback','sliderAmp_callback(handles)')
> handles.Freq=uicontrol(f,'unit','normalized','BackgroundColor',[0.8,0.8,0.8],'Enable','on','FontAngle','normal','FontName','helvetica','FontSize',[12],'FontUnits','points','FontWeight','normal','ForegroundColor',[0,0,0],'HorizontalAlignment','center','ListboxTop',[],'Max',[100],'Min',[0],'Position',[0.1551235,0.6595349,0.1083951,0.0339535],'Relief','flat','SliderStep',[0.01,0.1],'String','Frequency','Style','text','Value',[1],'VerticalAlignment','middle','Visible','on','Tag','Freq','Callback','')
> handles.pbPlot=uicontrol(f,'unit','normalized','BackgroundColor',[0.6,0.6,0.6],'Enable','on','FontAngle','normal','FontName','helvetica','FontSize',[12],'FontUnits','points','FontWeight','normal','ForegroundColor',[0,0,0],'HorizontalAlignment','center','ListboxTop',[],'Max',[1],'Min',[0],'Position',[0.0932716,0.4604651,0.0952469,0.0403876],'Relief','raised','SliderStep',[0.01,0.1],'String','Plot','Style','pushbutton','Value',[0],'VerticalAlignment','middle','Visible','on','Tag','pbPlot','Callback','pbPlot_callback(handles)')
> handles.Axes1= newaxes();handles.Axes1.margins = [ 0 0 0
> 0];handles.Axes1.axes_bounds = [0.3503086,0.0503876,0.5895062,0.5949612];
> handles.editTime=uicontrol(f,'unit','normalized','BackgroundColor',[0.8,0.8,0.8],'Enable','on','FontAngle','normal','FontName','helvetica','FontSize',[12],'FontUnits','points','FontWeight','normal','ForegroundColor',[0,0,0],'HorizontalAlignment','center','ListboxTop',[],'Max',[1],'Min',[0],'Position',[0.0932716,0.5829279,0.2114198,0.0447471],'Relief','sunken','SliderStep',[0.01,0.1],'String','0:0.01:10','Style','edit','Value',[0],'VerticalAlignment','middle','Visible','on','Tag','editTime','Callback','')
>
>
> //////////
> // Callbacks are defined as below. Please do not delete the comments as it
> will be used in coming version
> //////////
>
> function sliderAmp_callback(handles)
> //Write your callback for  slide1  here
> funcprot(0)
> amp = get(handles.Amp,'value');
> frq = get(handles.Freq,'value');
> t= evstr(get(handles.editTime,'String'));
> y=amp.*sin(2*%pi*frq.*t);
> plot(t,y);
> endfunction
>
>
> function sliderFreq_callback(handles)
> //Write your callback for  sliderFreq  here
>
> endfunction
>
>
> function pbPlot_callback(handles)
> //Write your callback for  pbPlot  here
> funcprot(0)
> amp = get(handles.Amp,'value');
> frq = get(handles.Freq,'value');
> t= evstr(get(handles.editTime,'String'));
> y=amp.*sin(2*%pi*frq.*t);
> //if ~isempty(handles.Axes1.children)
> //    delete(handles.Axes1.children)
> //end
> plot(t,y); xgrid();
> endfunction
>
>
>
>
>
>
> --
> View this message in context: http://mailinglists.scilab.org/Refresh-plot-from-Slider-tp4031131.html
> Sent from the Scilab users - Mailing Lists Archives mailing list archive at Nabble.com.
> _______________________________________________
> users mailing list
> users at lists.scilab.org
> http://lists.scilab.org/mailman/listinfo/users
>