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KSEG is a GNU/Linux program for exploring Euclidean geometry. You create a construction, such as a triangle with a circumcenter, and as you drag verteces of the triangle, the circumcenter moves in real time. Other features include:

  • Fast core which supports large constructions
  • Supports multiple languages
  • Construction of points, segments, rays, lines, circles, and arcs
  • Make measurements
  • Transformations (rotation, translation, scaling, reflection)
  • Construction of adaptively sampled loci for better quality and speed
  • Reverse dragging
  • Infinite undo/redo
  • Ability to easily redefine points to "edit" drawings
  • Editable scripting/macro with support for recursion
  • Pretty formulas for calculations-with libkformula
  • Small files
  • Quick play--one step to play any construction from a directory
  • Calculation based transformations
  • Improved selection-to-given matching in constructions


User README included


Download version 0.4 (stable)
released on 18 April 2003


Related Projects


LicenseVerified byVerified onNotes
GPLv2Janet Casey12 June 2001

Leaders and contributors

Ilya Baran Maintainer
Jorge Barros de Abreu Contributor

Resources and communication

Audience Resource type URI
Bug Tracking,Developer,Support E-mail

Software prerequisites

Kind Description
Required to use Qt 3.x or later

This entry (in part or in whole) was last reviewed on 13 May 2003.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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