2
The dot layout engine assumes a spline smoothing
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algorithm for edges, rather than Tk's default smoothing.
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So edges rendered to Tk canvas will look
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better if the Tkspline extension is available.
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Tkspline is available from:
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ftp://ftp.graphviz.org/pub/
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For Tk prior to tk8.3.0 Jan Nijtmans' dash patches
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are required by Tkspline.
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Dash patches are available from:
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http://home.wxs.nl/~nijtmans/