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[[File:4node-digraph-natural.svg|thumb|upright=0.5|图2：带箭头显示边方向的[[有向图]]]]
[[File:4node-digraph-natural.svg|thumb|upright=0.5|图2：带箭头显示边方向的[[有向图]]]]
图经常绘制成节点链接图，其中顶点可以是为圆框、方框或文本标签，边表示为'''<font color="#ff8000">欧式平面 Euclidean Plane</font>'''上的线段、折线或曲线。<ref name="dett-viii">Di Battista et al. (1994), p. viii.</ref>节点链接图可以追溯到13世纪雷蒙·卢尔 Ramon Llull的作品，他为得到'''完全图'''，绘制了这种类型的图，以便分析形而上学概念集合之间的所有成对组合。<ref>{{citation|contribution=Two thousand years of combinatorics|first=Donald E.|last=Knuth|authorlink=Donald Knuth|pages=7–37|title=Combinatorics: Ancient and Modern|publisher=Oxford University Press|year=2013|editor1-first=Robin|editor1-last=Wilson|editor2-first=John J.|editor2-last=Watkins}}.</ref>
图经常绘制成节点链接图，其中顶点可以是为圆框、方框或文本标签，边表示为'''<font color="#ff8000">欧式平面 Euclidean Plane</font>'''上的线段、折线或曲线。<ref name="dett-viii">Di Battista et al. (1994), p. viii.</ref>节点链接图可以追溯到13世纪雷蒙·卢尔 Ramon Llull的作品，他为得到'''完全图'''，绘制了这种类型的图，以便分析形而上学概念集合之间的所有成对组合。<ref>{{citation|contribution=Two thousand years of combinatorics|first=Donald E.|last=Knuth|pages=7–37|title=Combinatorics: Ancient and Modern|publisher=Oxford University Press|year=2013|editor1-first=Robin|editor1-last=Wilson|editor2-first=John J.|editor2-last=Watkins}}.</ref>
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| year = 1994 | doi=10.1016/0925-7721(94)00014-x}}.
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