120ca87015
git-svn-id: https://free-cad.svn.sourceforge.net/svnroot/free-cad/trunk@5000 e8eeb9e2-ec13-0410-a4a9-efa5cf37419d
125 lines
3.8 KiB
C++
125 lines
3.8 KiB
C++
// Wild Magic Source Code
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// David Eberly
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// http://www.geometrictools.com
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// Copyright (c) 1998-2007
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation; either version 2.1 of the License, or (at
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// your option) any later version. The license is available for reading at
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// either of the locations:
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// http://www.gnu.org/copyleft/lgpl.html
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// http://www.geometrictools.com/License/WildMagicLicense.pdf
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// The license applies to versions 0 through 4 of Wild Magic.
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//
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// Version: 4.0.0 (2006/06/28)
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#ifndef WM4LINCOMP_H
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#define WM4LINCOMP_H
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#include "Wm4FoundationLIB.h"
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#include "Wm4Math.h"
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namespace Wm4
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{
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template <class Real>
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class LinComp
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{
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public:
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// abstract base class
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virtual ~LinComp ();
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// The linear component is represented as P+t*D where P is the component
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// origin and D is a unit-length direction vector. The user must ensure
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// that the direction vector satisfies this condition. The t-intervals
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// for lines, rays, segments, points, or the empty set are described
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// later.
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// component type
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enum
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{
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CT_EMPTY,
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CT_POINT,
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CT_SEGMENT,
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CT_RAY,
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CT_LINE
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};
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int GetType () const;
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// The interval of restriction for t, as defined above. The function
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// SetInterval(min,max) sets the t-interval; it handles all possible
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// inputs according to the following scheme:
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// CT_LINE:
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// [-MAX_REAL,MAX_REAL]
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// CT_RAY:
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// [min,MAX_REAL], where min is finite
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// [-MAX_REAL,max], where max is finite
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// CT_SEGMENT:
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// [min,max], where min and max are finite with min < max
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// CT_POINT:
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// [min,max], where min and max are finite with min = max
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// CT_EMPTY:
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// [min,max], where min > max or min = max = MAX_REAL or
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// min = max = -MAX_REAL
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void SetInterval (Real fMin, Real fMax);
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// Determine the type of an interval without having to create an instance
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// of a LinComp object.
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static int GetTypeFromInterval (Real fMin, Real fMax);
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// The canonical intervals are [-MAX_REAL,MAX_REAL] for a line;
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// [0,MAX_REAL] for a ray; [-e,e] for a segment, where e > 0; [0,0] for
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// a point, and [MAX_REAL,-MAX_REAL] for the empty set. If the interval
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// is [min,max], the adjustments are as follows.
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//
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// CT_RAY: If max is MAX_REAL and if min is not zero, then P is modified
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// to P' = P+min*D so that the ray is represented by P'+t*D for t >= 0.
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// If min is -MAX_REAL and max is finite, then the origin and direction
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// are modified to P' = P+max*D and D' = -D.
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//
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// CT_SEGMENT: If min is not -max, then P is modified to
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// P' = P + ((min+max)/2)*D and the extent is e' = (max-min)/2.
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//
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// CT_POINT: If min is not zero, the P is modified to P' = P+min*D.
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//
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// CT_EMPTY: Set max to -MAX_REAL and min to MAX_REAL.
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//
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// The first function is virtual since the updates are dependent on the
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// dimension of the vector space.
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virtual void MakeCanonical () = 0;
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bool IsCanonical () const;
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// access the interval [min,max]
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Real GetMin () const;
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Real GetMax () const;
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// Determine if the specified parameter is in the interval.
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bool Contains (Real fParam) const;
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protected:
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LinComp (); // default is CT_NONE
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// assignment
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LinComp& operator= (const LinComp& rkComponent);
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// component type
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int m_iType;
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// the interval of restriction for t
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Real m_fMin, m_fMax;
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};
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} //namespace Wm4
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#include "Wm4LinComp.inl"
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namespace Wm4
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{
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typedef LinComp<float> LinCompf;
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typedef LinComp<double> LinCompd;
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}
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#endif
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