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| Open Source Stroke Translation Library |
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posted by Editor on Thursday October 11, @06:28PM
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LibStroke is an Open Source stroke translation library. Strokes are motions of the mouse that can be interpreted by a program as a command (the technique was first developed in ECAD programs such as Mentor Graphics - see examples at the bottom of this page). The code can be downloaded here, and it has already been implemented in Linux as extensions for KDE, the X Window System, and the FVWM window manager.
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For those wanting to know a little more about how this works, a quick summary is that the library takes a sequence of mouse movements over an imaginary grid of nine squares, and produces a unique number to represent the "trail" of mouse movement.
So, for example (and this is according to the list of common strokes found in the source download), a downward "\" from left to right would result in the number 159, while a more complex "U" shape drawn from left to right would result in the number 1478963.
Typically, you take the pre-defined numbers for common patters and assign them to commands - so a result of "5" from this library might delete a graphic object the mouse is over.
The download also comes with Java sources in addition to other bindings, (including TCL I think), and the library itself is quite small (one class).
A few years ago I was using a Java CAD-like library called ClearSpace (now defunct) that had a gesture system like this built in, it worked quite well and made a great command interface for graphic applications.
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