Java Knot Sketcher Calculate the Gauss code and DT notation with this handy tool
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Java Knot Sketcher Description

Java Knot Sketcher is a handy application that by drawing a knot diagram allows you to calculate the Gauss code and DT notation. The general idea is to draw a (polygonal) knot diagram that is equivalent to the knot diagram you are interested in. Drawing the knot First you start at some point on the knot and trace out a similar knot on the screen, disregarding the handedness of the crossings. Clicking on the canvas will fix a corner on the knot. If you make an error, you can back up by right-clicking. You will not be able to: make hard corners, place an line segment too close to a vertex of another line segment or place a line segment too close to a crossing. Eventually you will close the loop by clicking on the initial vertex. Changing the orientation or the handedness of the crossings When the knot is closed off, the program will compute the various notations it knows about. To change the handedness of a crossing, just click on it. The notation will be updated automatically. Through the menu, you may also: reverse the handedness of all the crossings (mirror image), reverse the orientation of the knot diagram, or make the diagram alternating.

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