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The $1 Unistroke Recognizer, a 2D single-stroke recognizer.

License

The $1 Unistroke Recognizer (Dart version, based on the JavaScript version)
 Adil Hanney (@adil192 on GitHub)
 Manchester, UK
 adilhanney@disroot.org

The $1 Unistroke Recognizer (JavaScript version)
 Jacob O. Wobbrock, Ph.D.
 The Information School
 University of Washington
 Seattle, WA 98195-2840
 wobbrock@uw.edu

 Andrew D. Wilson, Ph.D.
 Microsoft Research
 One Microsoft Way
 Redmond, WA 98052
 awilson@microsoft.com

 Yang Li, Ph.D.
 Department of Computer Science and Engineering
 University of Washington
 Seattle, WA 98195-2840
 yangli@cs.washington.edu

The academic publication for the $1 recognizer, and what should be
used to cite it, is:

    Wobbrock, J.O., Wilson, A.D. and Li, Y. (2007). Gestures without
    libraries, toolkits or training: A $1 recognizer for user interface
    prototypes. Proceedings of the ACM Symposium on User Interface
    Software and Technology (UIST '07). Newport, Rhode Island (October
    7-10, 2007). New York: ACM Press, pp. 159-168.
    https://dl.acm.org/citation.cfm?id=1294238

The Protractor enhancement was separately published by Yang Li and programmed
here by Jacob O. Wobbrock:

    Li, Y. (2010). Protractor: A fast and accurate gesture
    recognizer. Proceedings of the ACM Conference on Human
    Factors in Computing Systems (CHI '10). Atlanta, Georgia
    (April 10-15, 2010). New York: ACM Press, pp. 2169-2172.
    https://dl.acm.org/citation.cfm?id=1753654

The Dart version was ported from the JavaScript version by Adil Hanney,
for use in Flutter apps.

This software is distributed under the "New BSD License" agreement:

Copyright (C) 2007-2023,
Jacob O. Wobbrock, Andrew D. Wilson, Yang Li, Adil Hanney.
All rights reserved. Last updated October 28, 2023.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
   * Neither the names of the University of Washington nor Microsoft,
     nor the names of its contributors may be used to endorse or promote
     products derived from this software without specific prior written
     permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Jacob O. Wobbrock OR Andrew D. Wilson
OR Yang Li OR Adil Hanney BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.