Creates a new javafx.beans.binding.FloatBinding that contains the element of an javafx.collections.ObservableArray at the specified position. The FloatBinding will hold 0.0f if the index is outside of the ObservableArray.

Parameters:

op		the ObservableArray
index		the position in the ObservableArray

Returns:  the new FloatBinding

Exceptions:

NullPointerException

if the ObservableArray or index is null

Since:  JavaFX 8.0