Hi SS, No magic here. SelectTool is itself an abstract class, so selection is initialized in the classes that extend SelectTool like SelectFeaturesTool, SelectLineStringsTool, SelectPartsTool, and SelectOneItemTool.
regards, Larry On 8/31/07, Sunburned Surveyor <[EMAIL PROTECTED]> wrote: > I've been trying to find a quick way to create Polygons from selected > LineStrings in one of my OpenJUMP GIS projects. I've been using the > suggestion to set up a temporary Layer were I paste a copy of the > LineStrings I've selected, then I use the polygonize tool to actually > create the Polygons. > > I thought I would take a "quick" look at OpenJUMP's selection code to > see if I could determine how to implement a CursorTool similar to the > select tool that allows a little more control over selection. This > includes the ability to have "sticky" selections, the ability to > remove selected items from a sticky selection, and the ability to > automatically copy selected items to a new or designated layer with a > single click. > > I think I've got a good handle on how the selection code works, excpet > for one problem that I can't figure out in the SelectTool class. The > class defines and uses an instance of the AbstractSelection class > named "selection". It is declared as a protexted variable in the > class, but I can't for the life of me figure out where the variable is > initialized. It isn't in the constructor of the SelectTool class, it > isn't in the variable declaration, and I couldn't find an > initialization reading through the file, searching for instances of > the "new" keyword in the file, or using the "references" tool in > Eclipse. > > Is there some black magic going on in the code that I don't know > about. If the "selection" variable isn't initialized how come the > calls to its methods in the class don't throw a null pointer > exception? I know I am missing something, but I'm not sure what I am > missing. > > I appreciate any help. > > The .java file for the SelectTool class is attached. > > The Sunburned Surveyor > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > -- http://amusingprogrammer.blogspot.com/ ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
