Re: [mapserver-users] Scaling Image Symbol Offset
Dear Steve, Is this another case for allowing the user to explicitly specify the centre of a symbol (as proposed in RFC 45 - http://mapserver.org/development/rfc/ms-rfc-45.html)? Håvard Steve Lime wrote: Hi David: There is no connection between offset and symbol size. The offset is independent and given as a constant value in pixels (although it is scaled). Sounds like you need to change it dynamically based on your image size and that can't be done as things sit now. Can you fix your image size or is it and I'm missing something. Steve On 7/16/2009 at 3:51 AM, in message 9c37154dc7c8074fbc34214363755b7c330...@itb-svr-01.itbeyond.local, David Martin da...@itbeyond.com.au wrote: I am developing a new application and am rendering around a load of graphic symbol layers using a Map file layer such as LAYER NAMEcape_headland_point STATUS ON GROUP all DATA'ExplorOz/Places/Cape,Headland,Point' TYPEPOINT SYMBOLSCALE 100 CLASS STYLE SYMBOL [POIImage] MAXSIZE 15 MINSIZE 4 SIZE 8 END END METADATA wms_title Capes, Headlands Points END PROJECTION +proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs END END As you can see I am sizing the output symbol which is a 20x20px PIXMAP image - this is working great however the position of the image needs to be OFFSET up by half the size of the image (to make the actual point be the center of the image) - I have tried using OFFSET however when the image size changes (based on SYMBOLSCALE)the offsets are wrong. Is there a way to OFFSET image symbols based on the SYMBOLSCALE and MAX/MIN SIZES? Regards David ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users -- Håvard Tveite Department of Mathematical Sciences and Technology, UMB Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY Phone: +47 64965483 Fax: +47 64965401 http://www.umb.no/imt/ ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Scaling Image Symbol Offset
Hi David: There is no connection between offset and symbol size. The offset is independent and given as a constant value in pixels (although it is scaled). Sounds like you need to change it dynamically based on your image size and that can't be done as things sit now. Can you fix your image size or is it and I'm missing something. Steve On 7/16/2009 at 3:51 AM, in message 9c37154dc7c8074fbc34214363755b7c330...@itb-svr-01.itbeyond.local, David Martin da...@itbeyond.com.au wrote: I am developing a new application and am rendering around a load of graphic symbol layers using a Map file layer such as LAYER NAMEcape_headland_point STATUS ON GROUP all DATA'ExplorOz/Places/Cape,Headland,Point' TYPEPOINT SYMBOLSCALE 100 CLASS STYLE SYMBOL [POIImage] MAXSIZE 15 MINSIZE 4 SIZE 8 END END METADATA wms_title Capes, Headlands Points END PROJECTION +proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs END END As you can see I am sizing the output symbol which is a 20x20px PIXMAP image - this is working great however the position of the image needs to be OFFSET up by half the size of the image (to make the actual point be the center of the image) - I have tried using OFFSET however when the image size changes (based on SYMBOLSCALE)the offsets are wrong. Is there a way to OFFSET image symbols based on the SYMBOLSCALE and MAX/MIN SIZES? Regards David ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Scaling Image Symbol Offset
David Martin wrote: As you can see I am sizing the output symbol which is a 20x20px PIXMAP image – this is working great however the position of the image needs to be OFFSET up by half the size of the image (to make the actual point be the center of the image) – I have tried using OFFSET however when the image size changes (based on SYMBOLSCALE)the offsets are wrong. Is there a way to OFFSET image symbols based on the SYMBOLSCALE and MAX/MIN SIZES? David, unfortunately, OFFSET behaves exactly the way you are pointing out, that is, it doesn't scale because it's values are expressed in pixels no matter what SIZEUNITS or SYMBOLSCALE. As to the task you would like to accomplish, though, what about making the image itself twice as tall and moving the symbol into the upper half of the image, thus having the center of your image located beneath the symbol itself? The image would still scale correctly and account for offsetting the symbol by itself. Best regards, -- Andreas Albarello Analysis SW Development Territorium Online srl/GmbH Via Buozzi Str. 12 I 39100 Bolzano/Bozen Phone: +39 0471 068611 Fax:+39 0471 068619 email: andreas.albare...@territoriumonline.com web: http://www.territoriumonline.com ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Scaling Image Symbol Offset
RFC 45 suggests several rendering improvements for Mapserver, including adding a tag (CENTER/ORIGIN) for specifying the centre of a symbol. This feature has, however, not been given priority yet (there are workarounds for the most important cases). http://mapserver.org/development/rfc/ms-rfc-45.html -- CENTER/ORIGIN [x y] Defines the centre of the symbol using decimal pixels (x axis increasing to the right, y axis increasing downwards). * Is used for placing a point symbol on the map or on a “decorated” line * Defines the center of rotation if an ANGLE is specified for point symbols. * Default value is the centre of the symbol’s bounding box. * Applies to TYPE ellipse, vector, pixmap, truetype. -- Håvard David Martin wrote: I am developing a new application and am rendering around a load of graphic symbol layers using a Map file layer such as LAYER NAMEcape_headland_point STATUS ON GROUP all DATA'ExplorOz/Places/Cape,Headland,Point' TYPEPOINT SYMBOLSCALE 100 CLASS STYLE SYMBOL [POIImage] MAXSIZE 15 MINSIZE 4 SIZE 8 END END METADATA wms_title Capes, Headlands Points END PROJECTION +proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs END END As you can see I am sizing the output symbol which is a 20x20px PIXMAP image – this is working great however the position of the image needs to be OFFSET up by half the size of the image (to make the actual point be the center of the image) – I have tried using OFFSET however when the image size changes (based on SYMBOLSCALE)the offsets are wrong. Is there a way to OFFSET image symbols based on the SYMBOLSCALE and MAX/MIN SIZES? Regards David -- Håvard Tveite Department of Mathematical Sciences and Technology, UMB Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY Phone: +47 64965483 Fax: +47 64965401 http://www.umb.no/imt/ ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
[mapserver-users] Scaling Image Symbol Offset
I am developing a new application and am rendering around a load of graphic symbol layers using a Map file layer such as LAYER NAMEcape_headland_point STATUS ON GROUP all DATA'ExplorOz/Places/Cape,Headland,Point' TYPEPOINT SYMBOLSCALE 100 CLASS STYLE SYMBOL [POIImage] MAXSIZE 15 MINSIZE 4 SIZE 8 END END METADATA wms_title Capes, Headlands Points END PROJECTION +proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs END END As you can see I am sizing the output symbol which is a 20x20px PIXMAP image - this is working great however the position of the image needs to be OFFSET up by half the size of the image (to make the actual point be the center of the image) - I have tried using OFFSET however when the image size changes (based on SYMBOLSCALE)the offsets are wrong. Is there a way to OFFSET image symbols based on the SYMBOLSCALE and MAX/MIN SIZES? Regards David ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
