[Chameleon-dev] [Bug 1137] New: Adding real-world parameters to some objects in cwc_roi.js

[bugzilla-daemon at bugzilla.maptools.org]

http://bugzilla.maptools.org/show_bug.cgi?id=1137

           Summary: Adding real-world parameters to some objects in
                    cwc_roi.js
           Product: Chameleon
           Version: 2.2
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Widget
        AssignedTo: chameleon-dev at lists.maptools.org
        ReportedBy: jacob.delfos at maunsell.com


I'm trying to make use of the javascript ROI objects (for a digitizing widget),
but as soon as the extent is changed, certain parameters become useless, in that
they were only valid for that extent (coordinates stored in pixel space). I
realise that for most ROI applications this is not a problem, since the
information gets stored in the session correctly. However, I am not submitting
the page, and therefore need the javascript objects to remain valid. I want to
ask whether I can make the following changes for the Circle and Polygon objects:

add on line 774:
    this.geoRadius = 0; // allows parameters to be
    this.geoX = 0;      // correctly retrieved from javascript after zoom
    this.geoY = 0;

add on line 944:
        this.geoRadius = aRadius[0]-aCenter[0]; //keep a record of the 
        this.geoX = aCenter[0];             //parameters in real-world space
        this.geoY = aCenter[1];


add on line 989:
    this.geoCoords = "";   //used to store the nodes
                           //in geographic coordinates, as derived
                           //in "Serialize()"

add on line 1044 (after for-loop):
    this.geoCoords = szCoords; // keep a record of the geographical nodes


As far as I can tell, these changes should not cause any problems elsewhere, or
require a lot of additional processing. 

Jacob



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