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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | // Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
//----------------------------------------------------------------------------
template <typename Real>
Arc2<Real>::Arc2 ()
{
}
//----------------------------------------------------------------------------
template <typename Real>
Arc2<Real>::~Arc2 ()
{
}
//----------------------------------------------------------------------------
template <typename Real>
Arc2<Real>::Arc2 (const Vector2<Real>& center, Real radius,
const Vector2<Real>& end0, const Vector2<Real>& end1)
:
Center(center),
Radius(radius),
End0(end0),
End1(end1)
{
}
//----------------------------------------------------------------------------
template <typename Real>
bool Arc2<Real>::Contains (const Vector2<Real>& p) const
{
// Assert: |P-C| = R where P is the input point, C is the circle center,
// and R is the circle radius. For P to be on the arc from A to B, it
// must be on the side of the plane containing A with normal N = Perp(B-A)
// where Perp(u,v) = (v,-u).
Vector2<Real> diffPE0 = p - End0;
Vector2<Real> diffE1E0 = End1 - End0;
Real dotPerp = diffPE0.DotPerp(diffE1E0);
return dotPerp >= (Real)0;
}
//----------------------------------------------------------------------------
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