center-all-nodes

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.

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This page was not revised from the 9.0 page.
Created 2015.5.21.