A new antialiased line drawing algorithm

Bei Chuan Chen, Yu-Tai Ching*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Consider a line f(x) = mx + b, 0 ≤ m ≤ 1. Conventional line drawing algorithms sample (x, f(x)) on the line, where x must be an integer, and then map (x, f(x)) to the frame buffer according to the defined filter and f(x). In this paper, we propose to simulate a sampled point (x, f(x)) by the four pixels around it where x and f(x) are not necessary to be integers. Based on the proposed low-pass filtering, we show that the effect of sampling at infinite number of points along a line segment can be achieved since the closed form of the intensities assigned to pixels exists. Furthermore, we show the coherence properties that can reduce the cost for computing these intensities.

Original languageEnglish
Pages (from-to)187-193
Number of pages7
JournalComputers and Graphics (Pergamon)
Issue number2
StatePublished - 1 Jan 2001


  • Antialiasing
  • Computer graphics
  • Line drawing algorithm

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