Common Lisp Interface Manager 2.0 User's Guide > Chapter 17 Formatted Output > 17.2 Formatting Graphs in CLIM

(defstruct node (name "") (children nil))

(defvar g1 (let* ((2a (make-node :name "2A"))

(2b (make-node :name "2B"))

(2c (make-node :name "2C"))

(1a (make-node :name "1A" :children (list 2a 2b)))

(1b (make-node :name "1B" :children (list 2b 2c))))

(make-node :name "0" :children (list 1a 1b))))

(defun test-graph (root-node &rest keys)

(apply #'clim:format-graph-from-root root-node

#'(lambda (node s)

(write-string (node-name node) s))

#'node-children keys))

Evaluating ```
(test-graph g1 :stream *my-window*)
```

results in the following graph:

In Figure 32., the graph has a horizontal orientation and grows toward the right by default. We can supply the
:orientation
keyword to control this. Evaluating ```
(test-graph g1 :stream *my-window* :orientation :vertical)
```

results in the following graph:

The following example uses format-graph-from-roots to create a graph with multiple parents, that is, a graph in which node D is a child of both nodes B and C. Note that it interprets its first argument as a list of top-level graph nodes, so we have wrapped the root node inside a list.

(defun test-graph (win)

(window-clear win)

(format-graph-from-roots '((a (b (d)) (c (d))))

#'(lambda (x s) (princ (car x) s))

#'cdr

:stream win

:orientation :vertical

:merge-duplicates t

:duplicate-key #'car)

(force-output win))

Common Lisp Interface Manager 2.0 User's Guide - 22 Dec 2009