hi,
> After 4), you may have to collapse identical consecutive lines: h2h6h1 > can be replaced by h9. ;-) and maybe rotating your drawing in order to get a maximum of segmenst oriented h or v ... well, this reaches the point where optimisations kills itself... > As Andr� mentions, there may be a first step to reduce unecessary > precision, ie. to keep only a relevant number of digits per coordinate. > How much is the hardest part to estimate: too much and space is lost, > too low, and precision is lost. > If somebody has a formula to estimate the necessary number of digits > based on the above data, I would be interested... i don't have a formula, but i don't think is necessary. in drawing speed you have more than one factor: 1) server delivering speed 2) connection speed 3) clients graphics rendering speed 4) file size 5) drawing complexity 1-3 are pure hardware and technical the map optimisation we are speaking of here touches 4 and 5. if you reduce digits of coordinates, you will basically optimise the file size and not the drawing complexity (as this makes little difference for the rendering engine). as a consequence i think that no formula is necessary, skip decimal points and you will be fine (assuming classical map coordinate systems and scales). > 7) Join short paths. Of course, this is relevant only to anonymous > paths... If paths have IDs, they can't be joined. > For example, on 'my' map, each path was a country outline, including > islands (jumps with Ms), so each path element has both a semantic okay, that's true. but a map also consists of a lot of purely graphical (passive and ignorant) elements. or think about the low-level street network. > 8) To use cubic spline seems hard to do. Outlines would be smoother, but > how to be sure they fit to the real data without making extra curves? that's the hen&egg-problem of geodata used in maps. andr� ------------------------ Yahoo! Groups Sponsor --------------------~--> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar. Now with Pop-Up Blocker. Get it for free! http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/1U_rlB/TM --------------------------------------------------------------------~-> ----- To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click "edit my membership" ---- Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
