Graph panes require a function which is used to plot information, called the children function. The value of the ROOTS attribute of a graph is passed as an argument to the children function in order to start the plot. The example interface uses the following simple children function.
(defun children-function (x)
(when (< x 8)
(list (* x 2) (1+ (* x 2)))))
Note: The ROOTS attribute of a graph pane has a default value of '(1) . This is generated automatically by the interface builder.
Finally, the function test-ib-example is used to create an instance of the example interface.
(defun test-ib-example ()
(capi:display (make-instance 'ib-example)))