There was an interesting thread on this topic on the Cairo mailing list this past July. One of the drawbacks of the analytical AA approach is with coincident lines of the same color. An alternative supersampling approach was presented...
Check out the "polygon rasterization" threads here: http://lists.cairographics.org/archives/cairo/2007-July/thread.html#11092 It probably spills into August too. Steve >>> Flavio Hendry <[EMAIL PROTECTED]> 01/08/08 9:57 AM >>> Hi Thomas > that's how the agg antialiasing works ... Thanks. I was suspecting that ... The problem in this case is "magnified" by the harsh contrast between black and white (on smooth colors it does not "hit the eye" as much). I do not see any amplification effect if there are two lines or just one however (same layer, once as single lines and once as doubles looks exactly the same). Mit freundlichem Gruss / Best Regards Flavio Hendry ---------------------------------------------------------------- TYDAC Web-Site: http://www.tydac.ch TYDAC MapServer: http://www.mapserver.ch ---------------------------------------------------------------- ############ Mit freundlichen Gruessen / Kind Regards ############ mailto:[EMAIL PROTECTED] ############ TYDAC AG - http://www.tydac.ch #### #### Geographic Information Solutions #### #### Luternauweg 12 -- CH-3006 Bern ############ Tel +41 (0)31 368 0180 - Fax +41 (0)31 368 1860 ----------------------------------------------------------------
