Since X window installations do not necessarily use consistent color names, a particular color database has been installed in Ptolemy. The available colors can be found in the file
$PTOLEMY/lib/tcl/ptkColor.tcl. To access this color database, use the Tcl function
which returns a color defined in terms of RGB components. This color can be used anyplace that Tk expects a color. If the given name is not in the color database, the color returned is black.
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