Re: [mapserver-users] force labels to fit in polygons
You could generate a center point, there is a function that do it in irregular shaped, and fit the label in it Patricio Gigoux El 05-03-2012 18:50, Stephen Woodbridge escribió: On 3/5/2012 4:44 PM, Mark Volz wrote: Hello, Is there a way to force labels to fit inside of a polygon, even if a polygon is irregularly shaped? I noticed that with POSITION AUTO labels are falling outside of my soils boundary. The short answer is no. It is an interesting problem, but it does not have a guaranteed result as the label might be too big to fit regardless. I am not even sure of the algorithm should be for something like this. There are a lot of parameters like: font font size wrapping the text changing the angle finding the longest line, arc or smooth polyline that fits withing the polygon and then have the text follow that line These are all computationally expensive to do on the fly while rendering. Ideally these should be worked out in advance then you can supply the attributes to the label via binding columns in the data. -SteveW ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] force labels to fit in polygons
Right, the problem has two parts: 1) determine potential candidate label points 2) see if the label fits given the constraints placed on how to draw it This is NP hard problem because it not just a problem of labeling a single polygon you also have to deal with all the other labels on the map that you might collide with. If you search automatic label placement in google you can read up on the problem and the solutions that are available. Mapserver uses a different scheme for doing label placement that is much faster because it does not try to optimize label placement, but rather gives you controls for how labels should be placed, like POSITION, ANGLE AUTO|FOLLOW, PROCESSING LABEL_NO_CLIP=ON, PRIORITY, WRAP, MINFEATURESIZE, MAXLENGTH, PARTIALS, etc. By the way, PROCESSING LABEL_NO_CLIP=ON will fix the label point at the polygon center. -SteveW On 3/6/2012 6:13 AM, Patricio Gigoux wrote: You could generate a center point, there is a function that do it in irregular shaped, and fit the label in it Patricio Gigoux El 05-03-2012 18:50, Stephen Woodbridge escribió: On 3/5/2012 4:44 PM, Mark Volz wrote: Hello, Is there a way to force labels to fit inside of a polygon, even if a polygon is irregularly shaped? I noticed that with POSITION AUTO labels are falling outside of my soils boundary. The short answer is no. It is an interesting problem, but it does not have a guaranteed result as the label might be too big to fit regardless. I am not even sure of the algorithm should be for something like this. There are a lot of parameters like: font font size wrapping the text changing the angle finding the longest line, arc or smooth polyline that fits withing the polygon and then have the text follow that line These are all computationally expensive to do on the fly while rendering. Ideally these should be worked out in advance then you can supply the attributes to the label via binding columns in the data. -SteveW ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
[mapserver-users] force labels to fit in polygons
Hello, Is there a way to force labels to fit inside of a polygon, even if a polygon is irregularly shaped? I noticed that with POSITION AUTO labels are falling outside of my soils boundary. Thanks Mark Volz GIS Specialist ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] force labels to fit in polygons
On 3/5/2012 4:44 PM, Mark Volz wrote: Hello, Is there a way to force labels to fit inside of a polygon, even if a polygon is irregularly shaped? I noticed that with POSITION AUTO labels are falling outside of my soils boundary. The short answer is no. It is an interesting problem, but it does not have a guaranteed result as the label might be too big to fit regardless. I am not even sure of the algorithm should be for something like this. There are a lot of parameters like: font font size wrapping the text changing the angle finding the longest line, arc or smooth polyline that fits withing the polygon and then have the text follow that line These are all computationally expensive to do on the fly while rendering. Ideally these should be worked out in advance then you can supply the attributes to the label via binding columns in the data. -SteveW ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
