I've recently gotten re-interested in SVG mapping after experimenting with Firefox 1.5's built-in SVG support, but I've always found fitting map coordinates to the SVG system (x-coordinates increases from left to right and y-coordinates increase from top to bottom) to be somewhat problematic. What do people think is the best way to transform coordinates from real-world to SVG?
Do you convert geographic coordinates to local coordinates (like screen pixels or twips, etc. where the Y-coordinate increase to the south), or do you keep the geographic units unchanged but just reverse the y-axis by multiplying by -1, or do you perform a local transform on the y-axis so that you can use the unmodified geographic coordinates in SVG directly, or what? The choice impacts things like coordinate tracking or text placement, and other features that you may want to support in an online map presentation. I also wonder about issues like whether it's more efficient with GML paths to compress floating point coordinates to integers. Looking around the 'net, I see examples of all sorts of coordinate-transforming techniques in SVG maps, so is there any consensus on the "best" method, and why? So does anyone here have any opinions about the pros and cons of the various ways people convert geographic coordinates into SVG coordinates? - Bill Thoen ----- 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/
