[vtkusers] Fast 2D Graphics On Render Window

[Erik Sobel]

Is there any way to draw fast simple graphics on a render window?

I needed a pair of crosshair lines that move with the cursor on a 
renderWindow.  I did it with a line source, mapper2D, actor2D and 
re-rendered the scene with every mouse movement.  This is pretty slow.  Is 
there any way to do a simple moveto, lineto type of drawing without all the 
Object Oriented Overhead ?

Thanks
Erik