With the Preferences menu can be specified how the program behaves
at certain points.
This menu-item brings up the dialog below, with which the factors
for operations can be specified. For an explanation of each factor,
click on one of the names below the image.
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snapfactor,
correctionfactor,
selectmarge,
roundfactor,
correctionaber,
roundtype,
toarcrmin,
toarcrmax,
arcaccur,
polyaccur,
smoothaccur,
maxlinemerge,
displayaber.
structhres.
primthres.
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When this item is checked and the current file is saved, only the
layers visible on screen are saved.
When one or more layers are made invisible, these layers are not
saved.
NOTE: the file in memory remains the same, even when the file
that is saved overwrites the old file!!!
Check this menu-item to have a grid drawn with the file in memory.
The grid is drawn with the grid settings specified in the grid dialog.
When the grid is 'on', a little cross is drawn on the gridpoint closest
to the cursor. Commands like zoom, select, startpoint etc. use the
coordinates of this gridpoint.
This menu-item brings up the dialog below, with which the properties
of the grid can be altered.
Spacing is the distance between the grid points. It must be
specified with a unit. If no unit is specified, the value is interpreted
in meters.
The colour of the points can be changed into any colour. You can also choose if
you want the grid to be drawn before or after the image.
When the keystring command
is used, the program must know the unit of the values specified in
the command. It must also know what accuracy it has to work with.
In the Units Settings dialog these values can be specified.
Please note that accuracy can only be altered when there's
no file in memory. When there is, the accuracy from this file is used.
