Important
To understand saving better, read section Using the
graph model first.
There are many ways to store your graph and
your layout parameters:
- Diagram components use XML files for the data and CSS files for the rendering parameters.
- Diagram components can use a database.
- Graphers can be stored in .
ivlfiles.
This topic deals only with .
ivl
files. It is not relevant for applications that use XML files, CSS
files, or databases.
Layout parameters are stored in the layout classes directly, not in
the
IlvGrapher
. The advantage of this is that the layout parameters are
independent of the graph model. However, the disadvantage is that a
layout parameter setting is lost whenever a graph is saved to an
.ivl
file and reloaded later. To overcome this disadvantage, the IlvGrapherAdapter class allows you to
transfer the graph layout settings to instances of IlvNamedProperty that can be stored in
.ivl
files and to recover the settings from these named properties at a
later time, see Save parameters to named properties.
The following method indicates whether a
layout class supports this mechanism:
supportsSaveParametersToNamedProperties();
It returns
true
if the layout class can transfer the parameter settings to named
properties.