83 lines
3.3 KiB
C#
83 lines
3.3 KiB
C#
/**
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* The $P Point-Cloud Recognizer (.NET Framework 4.0 C# version)
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*
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* Radu-Daniel Vatavu, Ph.D.
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* University Stefan cel Mare of Suceava
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* Suceava 720229, Romania
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* vatavu@eed.usv.ro
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*
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* Lisa Anthony, Ph.D.
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* UMBC
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* Information Systems Department
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* 1000 Hilltop Circle
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* Baltimore, MD 21250
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* lanthony@umbc.edu
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*
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* Jacob O. Wobbrock, Ph.D.
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* The Information School
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* University of Washington
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* Seattle, WA 98195-2840
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* wobbrock@uw.edu
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*
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* The academic publication for the $P recognizer, and what should be
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* used to cite it, is:
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*
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* Vatavu, R.-D., Anthony, L. and Wobbrock, J.O. (2012).
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* Gestures as point clouds: A $P recognizer for user interface
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* prototypes. Proceedings of the ACM Int'l Conference on
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* Multimodal Interfaces (ICMI '12). Santa Monica, California
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* (October 22-26, 2012). New York: ACM Press, pp. 273-280.
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*
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* This software is distributed under the "New BSD License" agreement:
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*
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* Copyright (c) 2012, Radu-Daniel Vatavu, Lisa Anthony, and
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* Jacob O. Wobbrock. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the names of the University Stefan cel Mare of Suceava,
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* University of Washington, nor UMBC, nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Radu-Daniel Vatavu OR Lisa Anthony
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* OR Jacob O. Wobbrock BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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**/
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using System;
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namespace PDollarGestureRecognizer
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{
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public class Geometry
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{
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/// <summary>
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/// Computes the Squared Euclidean Distance between two points in 2D
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/// </summary>
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public static float SqrEuclideanDistance(Point a, Point b)
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{
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return (a.X - b.X) * (a.X - b.X) + (a.Y - b.Y) * (a.Y - b.Y);
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}
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/// <summary>
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/// Computes the Euclidean Distance between two points in 2D
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/// </summary>
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public static float EuclideanDistance(Point a, Point b)
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{
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return (float)Math.Sqrt(SqrEuclideanDistance(a, b));
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}
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}
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}
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