Field Technical Bulletin 187

FTB NO:	FTB187
DATE:	29th Januray 1998
SUBJECT:	Alternative zooming for Gsharp

ENHANCEMENT DESCRIPTION

Gsharp 3.0 includes the ability to zoom into the canvas using options under the View menu. The code to implement the zooming is written in GSL to allow users to write their own method of zooming.

The default method of zooming is zooming into the canvas. When you zoom all of the objects on the Gsharp canvas are drawn larger.

We have now written an alternative method of zooming. With this method all that changes when you zoom are the limits of the data. The viewports, titles and notes all stay in the same place, but you see a smaller part of your data.

IMPLEMENTATION

To use this new method of zooming download the following files from ftp.avs.com.

$UNIDIR/base/Menus.gsl ($UNIDIR/apps/Gsharp.gsa)
$UNIDIR/lib/libzoom.gsl

Once you have replaced libzoom.gsl the new zoom method will be available the next time you start Gsharp.