matlab-style properties

[alex]

Hi Jonathan, hi Dragan

One of the most useful mechanism in matlab are the handlers and the properties that can be accessed with get/set. I would be nice if octaviz could do something similar. I would like to share some thoughts about this could be implemented. Here follows an example that controls the position of the colorbar.

Cheers
Alex
 
 
 
 
function h = vtk_colorbar(string)

  f=vtk_figure(0);

  ## clear existing bar, if it exists
  nprops = f.renderer.GetProps.GetNumberOfItems;
  for i = 0:nprops-1;
    if ( f.renderer.GetProps.GetItemAsObject(i).IsA("vtkScalarBarActor") )
      f.renderer.RemoveViewProp( f.renderer.GetProps.GetItemAsObject(i) );
      break
    endif
  endfor

  if ( !strcmp(string, "remove") )
    scalarBar = vtkScalarBarActor;
    for i = f.renderer.GetActors.GetNumberOfItems-1:-1:0;
      mapper = f.renderer.GetActors.GetItemAsObject(i).GetMapper;
      ## a test to see if this actor is a real object (might be corner points generated in vtk_axis)
      if ( mapper.GetInput.GetNumberOfPolys )  ## will be zero if an unintersting actor
    scalarBar.SetLookupTable( mapper.GetLookupTable );
    break
      endif
    endfor
    scalarBar.SetTitle( string );
    scalarBar.GetPositionCoordinate.SetCoordinateSystemToNormalizedViewport;
    scalarBar.GetPositionCoordinate.SetValue(0.85, 0.05);
    scalarBar.SetWidth(0.15);
    scalarBar.SetHeight(0.9);
    scalarBar.SetLabelFormat("%1.2g");
    f.renderer.AddActor2D(scalarBar);
   
    ## shadow unnecessary, and doesn't export to vector format correctly
    scalarBar.GetTitleTextProperty.ShadowOff
    scalarBar.GetLabelTextProperty.ShadowOff
  endif
 
  vtk_update(f);

  % if requested create a handler structure with the "type" of the object
  % and the corresponding vtk object.
 
  if (nargout = 1)
    h.type = 'colorbar';
    h.scalarBar = scalarBar;
  end
 
endfunction

% maps matlab properties into vtk properties
 
function vtk_set(h,property,value)

if strcmp(h.type,'colorbar')
  if (strcmpi(property,'position'))   
    h.scalarBar.GetPositionCoordinate.SetValue(value(1), value(2));
    h.scalarBar.SetWidth(value(3));
    h.scalarBar.SetHeight(value(4));
  end   
%
% here will come other types like :
% elseif strcmp(h.type,'plot')
% elseif strcmp(h.type,'xlabel')
% elseif strcmp(h.type,'ylabel')
% [...]
else
  warning('not jet implemented');
end

% maps vtk properties into  matlab properties

function value = vtk_get(h,property)

if strcmp(h.type,'colorbar')
  if (strcmpi(property,'position'))
    position = h.scalarBar.GetPositionCoordinate.GetValue();
    width = h.scalarBar.GetWidth();
    height = h.scalarBar.GetHeight();
    value = [position(1) position(2) width height];
  end 
else
  warning('not jet implemented');
end

[Jonathan Stickel]

Looks good to me!  You are welcome to implement this (and other handle-graphics functions) and submit them.