Geometry.h

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00001 //# Copyright (C) 2010 by ESO (in the framework of the ALMA collaboration)
00002 //# Copyright (C) 1996,1997,1998,1999,2000,2001
00003 //# Associated Universities, Inc. Washington DC, USA.
00004 //#
00005 //# This library is free software; you can redistribute it and/or modify it
00006 //# under the terms of the GNU Library General Public License as published by
00007 //# the Free Software Foundation; either version 2 of the License, or (at your
00008 //# option) any later version.
00009 //#
00010 //# This library is distributed in the hope that it will be useful, but WITHOUT
00011 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00012 //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00013 //# License for more details.
00014 //#
00015 //# You should have received a copy of the GNU Library General Public License
00016 //# along with this library; if not, write to the Free Software Foundation,
00017 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
00018 //#
00019 //# Correspondence concerning AIPS++ should be addressed as follows:
00020 //#        Internet email: aips2-request@nrao.edu.
00021 //#        Postal address: AIPS++ Project Office
00022 //#                        National Radio Astronomy Observatory
00023 //#                        520 Edgemont Road
00024 //#                        Charlottesville, VA 22903-2475 USA
00025 //#
00026 //# $Id: Combinatorics.h 21116 2011-07-21 11:23:15Z gervandiepen $
00027 
00028 #ifndef SCIMATH_GEOMETRY_H
00029 #define SCIMATH_GEOMETRY_H
00030 
00031 #include <casacore/casa/aips.h>
00032 #include <casacore/casa/Quanta/Quantum.h>
00033 #include <utility>
00034 
00035 namespace casacore { //# NAMESPACE CASACORE - BEGIN
00036 
00037 // <summary>
00038 // Geometry related methods.
00039 // </summary>
00040 
00041 // <use visibility=export>
00042 
00043 //# <author>Dave Mehringer</author>
00044 // <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
00045 // </reviewed>
00046 // <etymology>
00047 // self-explanatory
00048 // </etymology>
00049 
00050 // <synopsis>
00051 // Various geometry related functions
00052 // </synopsis>
00053 
00054 // <motivation>
00055 // Commonly used geometrical functions for various image and region
00056 // applications.
00057 // </motivation>
00058 
00059 class Geometry {
00060   
00061 public:
00062  
00063         // Get result of rotating a 2-D vector counterclockwise through an angle
00064         // <src>theta</src>. The output pair will have x as the first
00065         // member and y as the second. <src>theta</src> must have angular units (no explicit
00066         // checking is done, but an exception will be thrown from the Quanta code if not).
00067         static std::pair<Double, Double> rotate2D(
00068                 Double x, Double y, const Quantity& theta
00069         );
00070 
00071         // Determine if two coplanar line segments, a and b, intersect. Line segment a
00072         // has end points a0 and a1, and line segment b has endpoints b0 and b1.
00073         // Algorithm from
00074         // http://stackoverflow.com/questions/563198/how-do-you-detect-where-two-line-segments-intersect
00075         static Bool doLineSegmentsIntersect(
00076                 Double a0x, Double a0y, Double a1x, Double a1y,
00077                 Double b0x, Double b0y, Double b1x, Double b1y
00078         );
00079 
00080 };
00081 } //# NAMESPACE CASACORE - END
00082 
00083 #endif
00084 
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