/*
        This JScript example illustrates how to use the editing recording feature
        of fcurves. This allows changes to be committed only after all edits have 
        been completed and undone if necessary.
*/
// Create a null
Application.NewScene( null, false );
var nullobj = ActiveSceneRoot.AddNull();
// Create an fcurve on the posx parameter from the null
var fc = nullobj.posx.AddFCurve();
// Define a random number of keys
var nbkeys = Math.round( Math.random() * 100 ) 
LogMessage( nbkeys );
var arraysize = nbkeys * 2;
var keys = new Array( 2 * nbkeys );
var i = 0, empty;
var offset = -50;
for ( i=0; i<arraysize; i+=2 )
{
        keys[i] = offset + i;
        keys[i+1] = ( Math.cos( (i + 1) / 10 ) * 50 );
}
// Set the keys on the fcurve
fc.SetKeys(keys);
// Begin recording changes to fcurve
fc.BeginEdit();
if ( fc.IsEditing() )
{
        LogMessage( "fcurve is recording changes" );
}
// Assign random values to keys
for ( i=0; i<fc.GetNumKeys(); i++ )
{
        // Assign a random value to keys
        fc.Keys(i).Value = ( Math.random() * 100 ) - 50;
}
// If the number of keys if greater than 50 then undo all the 
// changes you just made
nbkeys = fc.GetNumKeys();
if ( nbkeys> 50 )
{
        Application.LogMessage( "undoing changes" );
        fc.undoedit();
}
nbkeys = fc.GetNumKeys();
LogMessage( "total number of keys = " + nbkeys );
// End editing (not necessary to call if changes were undone)
fc.EndEdit();
if ( !fc.IsEditing() )
{
        LogMessage( "fcurve has finished recording changes" );
}
// Outputs:
//INFO : 87
//INFO : fcurve is recording changes
//INFO : undoing changes
//INFO : total number of keys = 87
//INFO : fcurve has finished recording changes