Previous/Next Extents Tool

[Barry Windridge]

Hi

Attached is a tool for navigating backwards and forwards between
previously selected extents.  The tool also has a facility to create
'named extents' that are saved into, and restored from, the session
file.  Accessing the tool is through three toolbar buttons or three
extra menu options under the map menu.

The tool  requires modifications to five Thuban (version 1105) files
which are attached.

The tool only saves scale and offset. This means that it is not able
to correctly restore the extent if the size of the map window changes.
But it will restore the top left hand corner and   scale correctly.

Feedback on the tools would be appreciated.

Barry
Barry Windridge
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