15.6 Defining the callbacks

15.6.4 Other miscellaneous functions

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 functiontest-ib-example is used to create an instance of the example interface.

(defun test-ib-example ()
  (capi:display (make-instance 'ib-example)))

Common LispWorks User Guide, Liquid Common Lisp Version 5.0 - 18 OCT 1996

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