[Chameleon-dev] [Bug 1440] New: Polygon ROI is not clipped properly when displayed in partial extent

[bugzilla-daemon at bugzilla.maptools.org]

http://bugzilla.maptools.org/show_bug.cgi?id=1440

           Summary: Polygon ROI is not clipped properly when displayed in
                    partial extent
           Product: Chameleon
           Version: 2.2
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Widget
        AssignedTo: chameleon-dev at lists.maptools.org
        ReportedBy: mfyahya at gmail.com


If a polygon ROI is drawn and the user pans the map so that the ROI is partially
in extent, the ROI is not clipped correctly. This is noticeable as a change in
slope of the polygon edges that are not vertical or horizontal. 

This is caused by Geo2Pix function in ROIRenderer.php which simply sets a point
outside the extent to the maximum or minimum extent coordinate. I guess this
should be replaced by a function that finds a proper intersection between the
polygon ROI and the current map extent.



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