Yes, SVG (or at least most viewers) have problems with large numbers, especially the combination of large numbers and lots of decimals. I did some tests using ASV3 and 6 and found that Dutch national Grid coordinates (typically things like 243015.7262525, 254365.7226626) will give strange rounding effects (eg cirkles becoming polygons,). You have to either round to using less (eg. 2 ) decimals or eg. subtracting 200000 from x and 2540000 from y (giving them a false origin). I think this has to do with rounding problems in converting them to screen coordinates when rendering. ____________________________ Barend Köbben International Institute for Geo-information Sciences and Earth Observation (ITC) PO Box 6, 7500AA Enschede (The Netherlands) ph: +31-(0)534874253; fax: +31-(0)534874335 _____________________________
________________________________ From: [email protected] on behalf of Jeroen Vanattenhoven Sent: Thu 11/17/05 16:16 To: [email protected] Subject: Re: [svg-developers] does SVG have problem with big coordinates assigned to viewbox? I've used SVG maps for Belgium which uses Lambert 72 coördinates. This gives you coördinates of for example 172000 189000. Also pretty large. I don't have any problems with that. I did remove all decimal numbers. sent1729 schreef: > Hi all, > > This is the problem that I face. > > I am using SVG for mapping applications where I have all the maps > referenced to big coordinates. There seem to be some rendering issue > when I define my SVG viewbox with big coorrdinates. > This is what I mean: I have the following SVG file where I have 8 > line elements which are equally spaced for ex: > > <svg id ="ttt" x="0" y="0" width="1020" height="677" > viewBox="711316.0000 4324160.8000 10 10"> > > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="711316.0000 4324160.8000 711326.0000 4324160.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="711316.0000 4324161.8000 711326.0000 4324161.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="711316.0000 4324162.8000 711326.0000 4324162.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="711316.0000 4324163.8000 711326.0000 4324163.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="711316.0000 4324164.8000 711326.0000 4324164.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="711316.0000 4324165.8000 711326.0000 4324165.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="711316.0000 4324166.8000 711326.0000 4324166.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="711316.0000 4324167.8000 711326.0000 4324167.8000"/> > </svg> > > But when what I see on the screen is completely different. I see that > all the lines are unequally spaced. which is wrong. > > But if I make my viewbox coordinates small( i mean the "x" and "y" > attribute of viewbox), then I see the same line elements equally > spaced on the screen. For ex: > > <svg id ="ttt" x="0" y="0" width="1020" height="677" > viewBox="316.0000 160.8000 10 10"> > > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="316.0000 160.8000 326.0000 160.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="316.0000 161.8000 326.0000 161.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="316.0000 162.8000 326.0000 162.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="316.0000 163.8000 326.0000 163.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="316.0000 164.8000 326.0000 164.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="316.0000 165.8000 326.0000 165.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="316.0000 166.8000 326.0000 166.8000"/> > <polyline fill="none" style="stroke-width:.05;stroke:rgb(0,0,255);" > points="316.0000 167.8000 326.0000 167.8000"/> > </svg> > > > Why does this happen. 'am I missing something. > > Please help with any input. > > Thanks, > Nathan > > > > > > > > ----- > 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 > > > > > > 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 [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/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/
