hi Jeroen the main differences are:
1) when you set zoom&pan with the viewBox, you have to forbid zoomAndPan through the viewer's functionality (ctrl+something for ASV and Squiggle). as a cartographer this is the biggest drawback. it is possible to rebuild this functionality, but this is hardcore and may only be helpful when having a mapserver behind that delivers SVG 3) with the viewBox-method your interface is scalable. that may be useful, but i think it is generally not (readability, etc). 2) the viewBox-method rather fits for maps where a large part of your screen are devoted to the interface, whereas currentScale/Translate is better for applications with small interfaces and a bigger part for the map itself. andré -- ___________________________________________________________________ andre m. winter, cartography for internet and multimedia applications schiessstand 4/1, a6091 goetzens, tyrol, austria tel.: ++43.5234.32732 email: <[EMAIL PROTECTED]> <http://www.vectoreal.com/> SVG consulting and development <http://www.carto.net/> online cartography focusing on SVG <http://www.carto.at/> print and online touristic map solutions Jeroen Vanattenhoven wrote: > Andre M. Winter - Carto.net schreef: > > First of all, thanks for the elaborate answer. > > >> hi Jeroen, >> >> >> >> >>> Zoom & Pan operations on SVG maps are quite common. Mostly those >>> operations are implemented changing the viewBox attributes. >>> >>> >>> >> the problem is that viewBox manipulations are incompatible with >> currentScale/Translate because on every setting of new viewBox values >> currentScale/Translate gets set to 1,0,0 whatever they may have been set >> before. you should never mix those two methods, unless you know exactly >> what you do (btw i never saw an example doing that and this may be a >> stong enough argument...) >> >> >> >> > I see. The question I was actually posing was if the > currentScale/Translate method would be easier then the viewBox method > for maps inside user interfaces. Since currentScale/Translate only work > on the outmost svg element, the viewBox method seems more appropiate. > > >> no, that cannot work because currentScale/Translate always act on (or >> represent the state of) the outermost svg, the root element. the way to >> go is to have your main content zoomed as ever you want and apply >> inverse transformations (for <g>s) or inverse screenCTMs (for inner >> <svg>s) to the parts that are acting as "fixed" interface containers. >> >> >> > hehe, I'm actually belgian, but followed a german course the last two > years, so it will probably be ok :). > > >> because it is tricky. there are samples out there but these are not easy >> to break down in a 5-lines sample script. all this is explained in book >> coming out feb 2006, but it will be in german first (but you should be >> able to read it, judging based on your last name...) here is a short >> description <http://www.huethig.de/shop/product.html?id=146899&top=1>, >> the companion website will go online jan 2006 at <http://svg.carto.net/> >> (may be offline these times). >> >> > Could you comment on what you think is the most appropiate/easy way to > provide zoom & pan for maps in SVG? I only have experience with the > viewBox method. > > Jeroen > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm > > > > > ----- > 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 > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get Bzzzy! (real tools to help you find a job). Welcome to the Sweet Life. http://us.click.yahoo.com/KIlPFB/vlQLAA/TtwFAA/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/
