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panda/src/parametrics/nurbsMatrixVector.I

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// Filename: nurbsMatrixVector.I
// Created by:  drose (04Dec02)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////


////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE NurbsMatrixVector::
NurbsMatrixVector() {
}

////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::Destructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE NurbsMatrixVector::
~NurbsMatrixVector() {
}

////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::get_num_segments
//       Access: Public
//  Description: Returns the number of piecewise continuous segments
//               in the curve.
////////////////////////////////////////////////////////////////////
INLINE int NurbsMatrixVector::
get_num_segments() const {
  return _segments.size();
}

////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::get_start_t
//       Access: Public
//  Description: Returns the first legal value of t on the curve.
//               Usually this is 0.0.
////////////////////////////////////////////////////////////////////
INLINE float NurbsMatrixVector::
get_start_t() const {
  nassertr(!_segments.empty(), 0.0f);
  return _segments.front()._from;
}

////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::get_end_t
//       Access: Public
//  Description: Returns the last legal value of t on the curve.
////////////////////////////////////////////////////////////////////
INLINE float NurbsMatrixVector::
get_end_t() const {
  nassertr(!_segments.empty(), 0.0f);
  return _segments.back()._to;
}

////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::get_vertex_index
//       Access: Public
//  Description: Returns the vertex index of the nth segment.  This is
//               the index number of the first associated control
//               vertex within the source NurbsCurveEvaluator object.
////////////////////////////////////////////////////////////////////
INLINE int NurbsMatrixVector::
get_vertex_index(int segment) const {
  nassertr(segment >= 0 && segment < (int)_segments.size(), 0);
  return _segments[segment]._vertex_index;
}

////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::get_from
//       Access: Public
//  Description: Returns the t value of the beginning of this segment.
////////////////////////////////////////////////////////////////////
INLINE float NurbsMatrixVector::
get_from(int segment) const {
  nassertr(segment >= 0 && segment < (int)_segments.size(), 0.0f);
  return _segments[segment]._from;
}

////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::get_to
//       Access: Public
//  Description: Returns the t value of the end of this segment.
////////////////////////////////////////////////////////////////////
INLINE float NurbsMatrixVector::
get_to(int segment) const {
  nassertr(segment >= 0 && segment < (int)_segments.size(), 0.0f);
  return _segments[segment]._to;
}

////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::get_matrix
//       Access: Public
//  Description: Returns the matrix associated with the nth segment.
////////////////////////////////////////////////////////////////////
INLINE const LMatrix4f &NurbsMatrixVector::
get_matrix(int segment) const {
  nassertr(segment >= 0 && segment < (int)_segments.size(), LMatrix4f::ident_mat());
  return _segments[segment]._matrix;
}

////////////////////////////////////////////////////////////////////
//     Function: NurbsMatrixVector::scale_t
//       Access: Public
//  Description: Scales the value of t into the range [0, 1]
//               corresponding to [from, to].  Returns the scaled
//               value.
////////////////////////////////////////////////////////////////////
INLINE float NurbsMatrixVector::
scale_t(int segment, float t) const {
  nassertr(segment >= 0 && segment < (int)_segments.size(), 0.0f);
  float from = _segments[segment]._from;
  float to = _segments[segment]._to;
  t = (t - from) / (to - from);
  return min(max(t, 0.0f), 1.0f);
}

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