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→质量度量 Quality measures
*The [[slope number]] of a graph is the minimum number of distinct edge slopes needed in a drawing with straight line segment edges (allowing crossings). [[Cubic graph]]s have slope number at most four, but graphs of degree five may have unbounded slope number; it remains open whether the slope number of degree-4 graphs is bounded.<ref name="ps09"/>
*The [[slope number]] of a graph is the minimum number of distinct edge slopes needed in a drawing with straight line segment edges (allowing crossings). [[Cubic graph]]s have slope number at most four, but graphs of degree five may have unbounded slope number; it remains open whether the slope number of degree-4 graphs is bounded.<ref name="ps09"/>
图的'''<font color="#ff8000">斜率 Slope Number</font>'''是在具有直线段边(允许交叉)的图中所需的明显边缘斜率的最小值。'''<font color="#ff8000">三次图 Cubic Graphs</font>'''的斜率最大为4，五次图的斜率数可能是无界的，但四次的图的斜率是否有界仍然有待考量的。
图的'''<font color="#ff8000">斜率 Slope Number</font>'''是在具有直线段边(允许交叉)的图中所需的明显边缘斜率的最小值。'''<font color="#ff8000">三次图 Cubic Graphs</font>'''的斜率最大为4，五次图的斜率数可能是无界的，但四次的图的斜率是否有界仍然有待求证的。
==Layout methods 布局方法==
==Layout methods 布局方法==