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Allegro CL version 8.2
This page is new in 8.2.


Arguments: nodes center-x-reader center-y-reader center-writer width-reader height-reader canvas-left canvas-top canvas-right canvas-bottom &key canvas animate (steps 8) redisplay-function cancel-function

This function modifies the nodes passed in a list as the value of the nodes argument. The return value of this function is not defined.

This utility function might be useful when using the function graph-layout to draw graphs and handle mouse events on them. The arguments (except for steps, defined below) should be the same as the same-named arguments to graph-layout. See that function for more information.

This function will call the center-writer function that is passed to it on each of the nodes so as to center the entire set of nodes within the rectangular region that's defined by canvas-left, canvas-top, canvas-right, and canvas-bottom.

One argument to this function that graph-layout does not have is the steps argument. This is the number of incremental steps at which the redisplay-function will be called to draw the entire graph, along the path between the current node positions and their new centered positions. The default value is 8.

Copyright (c) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 8.2. This page is new in the 8.2 release.
Created 2010.1.21.

Allegro CL version 8.2
This page is new in 8.2.