Toby Rainthorpe wrote: > I am outputting EPSG 4326 (WGS84) polygon data as svg from postgis. I am > however struggling to get anything to render as SVG. Does anyone know > the correct viewBox and path transform setup to allow this type of data > to render as svg. Or should I be using a different method? > > Here is an example of what I am currently doing. The path should render > a low res polygon of Oxford, UK. > > Thanks for your help, > > Toby > > <?xml version="1.0"?> > <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" > "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd";> > <svg width="1000px" height="1000px" viewBox="0 0 1000 1000" > version="1.1" xmlns="http://www.w3.org/2000/svg";> > > <path transform="rotate(-90) scale(100, 100)" d="M 0.921728857893816 > -51.667439178992964 -0.943648406641863 -51.632171437283979 > -1.034036852747396 -51.615081510110407 -1.039191311589453 > -51.598091782046289 -1.033829707386365 -51.556789304415609 > -1.1425733621232 -51.557652243792148 -1.145679223489618 > -51.547423329173235 -1.189737584965937 -51.532259424970057 > -1.229532663338833 -51.530540163435404 -1.250685053075961 > -51.535731015755111 -1.312050535540559 -51.548417712963399 > -1.425623923601573 -51.509218583082671 -1.428279846417039 > -51.508871866780524 -1.513905752021219 -51.547390754456636 > -1.559539348757429 -51.544194212449625 -1.552142863881142 > -51.552808047302449 -1.541332522749044 -51.592135260652277 > -1.485423223611759 -51.612046530991961 -1.451764485328202 > -51.660426172863772 -1.434161967168025 -51.707327545117195 > -1.47848156540616 -51.702245140035409 -1.609807649184428 > -51.689850777223604 -1.620999799213429 -51.740828342840693 > -1.628372901372629 -51.754888694562183 -1.722123487421185 > -51.786808960161039 -1.708360615052025 -51.839001461487797 > -1.704942063318551 -51.840116976257576 -1.690786233278003 > -51.880706380276834 -1.603332789259012 -51.953422473934495 > -1.587297429691924 -51.973814827929104 -1.523602838008319 > -51.984481534794249 -1.543869897542569 -52.09381155015555 > -1.512481859689253 -52.068455261898272 -1.444721028482055 > -52.135737033033088 -1.427704375949055 -52.138631878072097 > -1.331856824432614 -52.168816391950621 -1.262767634105308 > -52.14457688819958 -1.207370939790454 -52.127537934403819 > -1.16423442917146 -52.121737089323943 -1.159184763425933 > -52.1075121412795 -1.179247124874321 -52.086972310756543 > -1.242617144599129 -52.060726831549047 -1.248283132968878 > -52.058641011110218 -1.224176087740303 -51.986702353558726 > -1.148267250655421 -51.972959616664077 -1.094743177288104 > -51.971670104237695 -1.090899221646197 -51.9673693174175 > -1.015796442422725 -51.922784982564536 -1.008801622188257 > -51.920118492786557 -1.010300996939166 -51.905500861451756 > -1.037320729582182 -51.875178460936723 -1.045299326181702 > -51.863391677882802 -1.095584860875437 -51.833557109123397 > -1.106668344949025 -51.824307819728489 -1.059837346061549 > -51.746986223607081 -0.998140121763855 -51.759686293695736 > -0.96995159142063 -51.764519051940162 -0.932876409075794 > -51.751189639314866 -0.90604174112355 -51.733290639496737 > -0.881141004715887 -51.688327043177416 Z" fill="red" stroke="blue" > stroke-width="3" /> > > </svg>_______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users
Hi Toby, Change your viewBox to "-100 -100 0 0" and drop the transform. The viewBox specifies the clipping area, and since most (if not all) your coordinates are negative, you wont see anything using a clipping area that doesn't include negative points. What I normally do in this situation is parse through the points looking the top-leftmost and the bottom-rightmost, then use a transform to move all the points so they are centered on the origin, and use viewBox="-0.5*width -0.5*height width height". This yields a nicely scaled and centered image. Check out the SVG spec oespecially the section on coordinate systems, tranforms and viewboxes. Cheers, James _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
