[AGG] (Newbie) How to draw a simple anti-aliased line?

Hello everybody,

I'm new to this list and to AGG and I hope you can give me some
advice.

I spent the whole day learning AGG and after a few hours I was able to
draw a line and a circle on the screen - woohoo! :)

Ok. I used renderer_primitives and I guess that's the reason why the
shapes are *not* anti-aliased. I think I have to use
rasterizer_scanline_aa but I could not figure out how to use it.


Please, could somebody write me those few lines necessary to get the
same on the screen, but with anti-aliasing?

Here's my code so far (only the relevant part):


--------------------------8<--------------------------------------

  // initialize rendering buffer
  // --> This is where AGG comes in. We give it access to the framebuffer. 
  agg::rendering_buffer rbuf(memory, 
    var_screeninfo.xres, var_screeninfo.yres, var_screeninfo.xres*2); 
        
  // initialize pixel format renderer (16 bit)
  // --> This class knows about the pixel format of the frame buffer.
  agg::pixfmt_rgb555 pixf(rbuf);
  
  // initialize renderer base
  // --> This class actually can do something useful with our buffer.
  agg::renderer_base<agg::pixfmt_rgb555> rbase(pixf);
  
  // "clear" screen
  rbase.clear(agg::rgba8(0, 0, 250));
  
  
  //----

  // aliased:
  agg::renderer_primitives<agg::pixfmt_rgb555> prim(pixf);   
  prim.line_color(agg::rgba8(250, 250, 0));
  prim.ellipse(200,200,100,100);
  prim.line(10*256, 10*256, 100*256, 20*256, true);

--------------------------8<--------------------------------------


The variable <memory> points to the mmapped framebuffer device, so I'm
drawing directly to the framebuffer device of a linux box
(800x600x15).

Many thanks for any hint!
Udo