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Straight-Line Drawings of General Trees with Linear Area and Arbitrary Aspect Ratio

机译:具有线性面积和任意纵横比的通用树的直线图

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摘要

Trees are usually drawn planar, i.e. without any crossings. In this paper we investigate the area requirement of planar straight-line drawings of trees. A degree-d tree is one in which each node has at most d edges incident on it. Let T be a degree-d tree with n nodes, such that d = O(n~δ), where δ < 1/2 is a constant. We show that T admits a planar straight-line grid drawing with area O(n) and with any prespecified aspect ratio in the range [l, n~α], where a is a constant such that 0 ≤ α < 1. We also show that such a drawing can be constructed in O(n log n) time.
机译:树木通常绘制为平面,即没有任何交叉。在本文中,我们研究了树木的平面直线图的面积要求。度d树是其中每个节点最多有d条边入射的树。令T为具有n个节点的度d树,使得d = O(n〜δ),其中δ<1/2为常数。我们表明,T允许使用面积为O(n)且具有任何预先指定的宽高比在[l,n〜α]范围内的平面直线网格图形,其中a为常数,使得0≤α<1。表明可以在O(n log n)的时间内构造这样的图形。

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