opennurbs_surfaceproxy.h

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/* $NoKeywords: $ */
/*
//
// Copyright (c) 1993-2012 Robert McNeel & Associates. All rights reserved.
// OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert
// McNeel & Associates.
//
// THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
// ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF
// MERCHANTABILITY ARE HEREBY DISCLAIMED.
//                              
// For complete openNURBS copyright information see <http://www.opennurbs.org>.
//
*/

//
//   Definition of surface proxy object
//

#if !defined(OPENNURBS_SURFACEPROXY_INC_)
#define OPENNURBS_SURFACEPROXY_INC_

class ON_Curve;
class ON_NurbsSurface;
class ON_CLASS ON_SurfaceProxy : public ON_Surface
{
public:
  // virtual ON_Object::DestroyRuntimeCache override
  void DestroyRuntimeCache( bool bDelete = true );

public:
  ON_SurfaceProxy();
  ON_SurfaceProxy(const ON_Surface*);
  ON_SurfaceProxy(const ON_SurfaceProxy&);
  ON_SurfaceProxy& operator=(const ON_SurfaceProxy&);

  virtual ~ON_SurfaceProxy();

  void SetProxySurface( const ON_Surface* proxy_surface );
  const ON_Surface* ProxySurface() const;
  bool ProxySurfaceIsTransposed() const;

private:
  const ON_Surface* m_surface;
  bool m_bTransposed; // proxy surface parameterization is transpose of m_surface

public:
  /*
  Description:
    Get a duplicate of the surface.
  Returns:
    A duplicate of the surface.  
  Remarks:
    The caller must delete the returned surface.
    For non-ON_SurfaceProxy objects, this simply duplicates the surface using
    ON_Object::Duplicate.
    For ON_SurfaceProxy objects, this duplicates the actual proxy surface 
    geometry and, if necessary, transposes the result to that
    the returned surfaces's parameterization and locus match the proxy surface's.
  */
  virtual
  ON_Surface* DuplicateSurface() const;

  // ON_Object overrides

  // virtual ON_Object::SizeOf override
  unsigned int SizeOf() const;

  // virtual ON_Object::DataCRC override
  ON__UINT32 DataCRC(ON__UINT32 current_remainder) const;

  /*
  Description:
    Tests an object to see if its data members are correctly
    initialized.
  Parameters:
    text_log - [in] if the object is not valid and text_log
        is not NULL, then a brief englis description of the
        reason the object is not valid is appened to the log.
        The information appended to text_log is suitable for 
        low-level debugging purposes by programmers and is 
        not intended to be useful as a high level user 
        interface tool.
  Returns:
    @untitled table
    true     object is valid
    false    object is invalid, uninitialized, etc.
  Remarks:
    Overrides virtual ON_Object::IsValid
  */
  ON_BOOL32 IsValid( ON_TextLog* text_log = NULL ) const;

  void Dump( ON_TextLog& ) const; // for debugging

  ON_BOOL32 Write(
         ON_BinaryArchive&  // open binary file
       ) const;

  ON_BOOL32 Read(
         ON_BinaryArchive&  // open binary file
       );

  // ON_Geometry overrides

  int Dimension() const;

  ON_BOOL32 GetBBox( // returns true if successful
         double*,    // minimum
         double*,    // maximum
         ON_BOOL32 = false  // true means grow box
         ) const;

  ON_BOOL32 Transform( 
         const ON_Xform&
         );

  // ON_Surface overrides

  ON_Interval Domain(
    int // 0 gets first parameter's domain, 1 gets second parameter's domain
    ) const;


  /*
  Description:
    Get an estimate of the size of the rectangle that would
    be created if the 3d surface where flattened into a rectangle.
  Parameters:
    width - [out]  (corresponds to the first surface parameter)
    height - [out] (corresponds to the first surface parameter)
  Remarks:
    overrides virtual ON_Surface::GetSurfaceSize
  Returns:
    true if successful.
  */
  ON_BOOL32 GetSurfaceSize( 
      double* width, 
      double* height 
      ) const;

  int SpanCount(
    int // 0 gets first parameter's domain, 1 gets second parameter's domain
    ) const; // number of smooth spans in curve

  ON_BOOL32 GetSpanVector( // span "knots" 
    int, // 0 gets first parameter's domain, 1 gets second parameter's domain
    double* // array of length SpanCount() + 1 
    ) const; // 

  int Degree( // returns maximum algebraic degree of any span 
                  // ( or a good estimate if curve spans are not algebraic )
    int // 0 gets first parameter's domain, 1 gets second parameter's domain
    ) const; 


  ON_BOOL32 GetParameterTolerance( // returns tminus < tplus: parameters tminus <= s <= tplus
         int,     // 0 gets first parameter, 1 gets second parameter
         double,  // t = parameter in domain
         double*, // tminus
         double*  // tplus
         ) const;

  // override virtual ON_Surface::IsIsoparametric
  ISO IsIsoparametric(
        const ON_Curve& curve,
        const ON_Interval* curve_domain = NULL
        ) const;

  // override virtual ON_Surface::IsIsoparametric
  ISO IsIsoparametric(
        const ON_BoundingBox& bbox
        ) const;

  /*
  Description:
    Test a surface to see if it is planar.
  Parameters:
    plane - [out] if not NULL and true is returned,
                  the plane parameters are filled in.
    tolerance - [in] tolerance to use when checking
  Returns:
    true if there is a plane such that the maximum distance from
    the surface to the plane is <= tolerance.
  Remarks:
    Overrides virtual ON_Surface::IsPlanar.
  */
  ON_BOOL32 IsPlanar(
        ON_Plane* plane = NULL,
        double tolerance = ON_ZERO_TOLERANCE
        ) const;

  ON_BOOL32 IsClosed(   // true if surface is closed in direction
        int        // dir  0 = "s", 1 = "t"
        ) const;

  ON_BOOL32 IsPeriodic( // true if surface is periodic in direction
        int        // dir  0 = "s", 1 = "t"
        ) const;

  ON_BOOL32 IsSingular( // true if surface side is collapsed to a point
        int        // side of parameter space to test
                   // 0 = south, 1 = east, 2 = north, 3 = west
        ) const;
  
  /*
  Description:
    Search for a derivatitive, tangent, or curvature 
    discontinuity.
  Parameters:
    dir - [in] If 0, then "u" parameter is checked.  If 1, then
               the "v" parameter is checked.
    c - [in] type of continity to test for.
    t0 - [in] Search begins at t0. If there is a discontinuity
              at t0, it will be ignored.  This makes it 
              possible to repeatedly call GetNextDiscontinuity
              and step through the discontinuities.
    t1 - [in] (t0 != t1)  If there is a discontinuity at t1 is 
              will be ingored unless c is a locus discontinuity
              type and t1 is at the start or end of the curve.
    t - [out] if a discontinuity is found, then *t reports the
          parameter at the discontinuity.
    hint - [in/out] if GetNextDiscontinuity will be called 
       repeatedly, passing a "hint" with initial value *hint=0
       will increase the speed of the search.       
    dtype - [out] if not NULL, *dtype reports the kind of 
        discontinuity found at *t.  A value of 1 means the first 
        derivative or unit tangent was discontinuous.  A value 
        of 2 means the second derivative or curvature was 
        discontinuous.  A value of 0 means teh curve is not
        closed, a locus discontinuity test was applied, and
        t1 is at the start of end of the curve.
    cos_angle_tolerance - [in] default = cos(1 degree) Used only
        when c is ON::G1_continuous or ON::G2_continuous.  If the
        cosine of the angle between two tangent vectors is 
        <= cos_angle_tolerance, then a G1 discontinuity is reported.
    curvature_tolerance - [in] (default = ON_SQRT_EPSILON) Used 
        only when c is ON::G2_continuous.  If K0 and K1 are 
        curvatures evaluated from above and below and 
        |K0 - K1| > curvature_tolerance, then a curvature 
        discontinuity is reported.
  Returns:
    Parametric continuity tests c = (C0_continuous, ..., G2_continuous):

      true if a parametric discontinuity was found strictly 
      between t0 and t1. Note well that all curves are 
      parametrically continuous at the ends of their domains.

    Locus continuity tests c = (C0_locus_continuous, ...,G2_locus_continuous):

      true if a locus discontinuity was found strictly between
      t0 and t1 or at t1 is the at the end of a curve.
      Note well that all open curves (IsClosed()=false) are locus
      discontinuous at the ends of their domains.  All closed 
      curves (IsClosed()=true) are at least C0_locus_continuous at 
      the ends of their domains.
  */
  bool GetNextDiscontinuity( 
                  int dir,
                  ON::continuity c,
                  double t0,
                  double t1,
                  double* t,
                  int* hint=NULL,
                  int* dtype=NULL,
                  double cos_angle_tolerance=ON_DEFAULT_ANGLE_TOLERANCE_COSINE,
                  double curvature_tolerance=ON_SQRT_EPSILON
                  ) const;

  /*
  Description:
    Test continuity at a surface parameter value.
  Parameters:
    c - [in] continuity to test for
    s - [in] surface parameter to test
    t - [in] surface parameter to test
    hint - [in] evaluation hint
    point_tolerance - [in] if the distance between two points is
        greater than point_tolerance, then the surface is not C0.
    d1_tolerance - [in] if the difference between two first derivatives is
        greater than d1_tolerance, then the surface is not C1.
    d2_tolerance - [in] if the difference between two second derivatives is
        greater than d2_tolerance, then the surface is not C2.
    cos_angle_tolerance - [in] default = cos(1 degree) Used only when
        c is ON::G1_continuous or ON::G2_continuous.  If the cosine
        of the angle between two normal vectors 
        is <= cos_angle_tolerance, then a G1 discontinuity is reported.
    curvature_tolerance - [in] (default = ON_SQRT_EPSILON) Used only when
        c is ON::G2_continuous.  If K0 and K1 are curvatures evaluated
        from above and below and |K0 - K1| > curvature_tolerance,
        then a curvature discontinuity is reported.
  Returns:
    true if the surface has at least the c type continuity at the parameter t.
  Remarks:
    Overrides virtual ON_Surface::IsContinuous
  */
  bool IsContinuous(
    ON::continuity c,
    double s, 
    double t, 
    int* hint = NULL,
    double point_tolerance=ON_ZERO_TOLERANCE,
    double d1_tolerance=ON_ZERO_TOLERANCE,
    double d2_tolerance=ON_ZERO_TOLERANCE,
    double cos_angle_tolerance=ON_DEFAULT_ANGLE_TOLERANCE_COSINE,
    double curvature_tolerance=ON_SQRT_EPSILON
    ) const;

  ON_BOOL32 Reverse(  // reverse parameterizatrion, Domain changes from [a,b] to [-b,-a]
    int // dir  0 = "s", 1 = "t"
    );

  ON_BOOL32 Transpose(); // transpose surface parameterization (swap "s" and "t")

  // work horse evaluator
  ON_BOOL32 Evaluate( // returns false if unable to evaluate
         double, double, // evaluation parameters
         int,            // number of derivatives (>=0)
         int,            // array stride (>=Dimension())
         double*,        // array of length stride*(ndir+1)*(ndir+2)/2
         int = 0,        // optional - determines which quadrant to evaluate from
                         //         0 = default
                         //         1 from NE quadrant
                         //         2 from NW quadrant
                         //         3 from SW quadrant
                         //         4 from SE quadrant
         int* = 0        // optional - evaluation hint (int[2]) used to speed
                         //            repeated evaluations
         ) const;


  ON_Curve* IsoCurve(
         int dir,
         double c
         ) const;

  int GetNurbForm( // returns 0: unable to create NURBS representation
                   //            with desired accuracy.
                   //         1: success - returned NURBS parameterization
                   //            matches the surface's to wthe desired accuracy
                   //         2: success - returned NURBS point locus matches
                   //            the surfaces's to the desired accuracy but, on
                   //            the interior of the surface's domain, the 
                   //            surface's parameterization and the NURBS
                   //            parameterization may not match to the 
                   //            desired accuracy.
        ON_NurbsSurface&,
        double = 0.0
        ) const;

  int HasNurbForm( // returns 0: unable to create NURBS representation
                   //            with desired accuracy.
                   //         1: success - returned NURBS parameterization
                   //            matches the surface's to wthe desired accuracy
                   //         2: success - returned NURBS point locus matches
                   //            the surfaces's to the desired accuracy but, on
                   //            the interior of the surface's domain, the 
                   //            surface's parameterization and the NURBS
                   //            parameterization may not match to the 
                   //            desired accuracy.
        ) const;

  bool GetSurfaceParameterFromNurbFormParameter(
        double nurbs_s, double nurbs_t,
        double* surface_s, double* surface_t
        ) const;

  bool GetNurbFormParameterFromSurfaceParameter(
        double surface_s, double surface_t,
        double* nurbs_s,  double* nurbs_t
        ) const;

private:

  ON_OBJECT_DECLARE(ON_SurfaceProxy);
};

#endif