115 lines
2.8 KiB
Text
115 lines
2.8 KiB
Text
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file nurbsBasisVector.I
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* @author drose
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* @date 2002-12-04
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*/
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/**
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*
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*/
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INLINE NurbsBasisVector::
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NurbsBasisVector() {
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_order = 0;
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}
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/**
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*
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*/
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INLINE NurbsBasisVector::
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~NurbsBasisVector() {
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}
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/**
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* Returns the order of the segments in the curve.
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*/
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INLINE int NurbsBasisVector::
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get_order() const {
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return _order;
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}
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/**
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* Returns the number of piecewise continuous segments in the curve.
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*/
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INLINE int NurbsBasisVector::
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get_num_segments() const {
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return _segments.size();
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}
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/**
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* Returns the first legal value of t on the curve. Usually this is 0.0.
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*/
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INLINE PN_stdfloat NurbsBasisVector::
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get_start_t() const {
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nassertr(!_segments.empty(), 0.0f);
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return _segments.front()._from;
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}
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/**
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* Returns the last legal value of t on the curve.
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*/
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INLINE PN_stdfloat NurbsBasisVector::
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get_end_t() const {
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nassertr(!_segments.empty(), 0.0f);
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return _segments.back()._to;
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}
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/**
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* Returns the vertex index of the nth segment. This is the index number of
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* the first associated control vertex within the source NurbsCurveEvaluator
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* object.
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*/
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INLINE int NurbsBasisVector::
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get_vertex_index(int segment) const {
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nassertr(segment >= 0 && segment < (int)_segments.size(), 0);
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return _segments[segment]._vertex_index;
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}
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/**
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* Returns the t value of the beginning of this segment.
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*/
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INLINE PN_stdfloat NurbsBasisVector::
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get_from(int segment) const {
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nassertr(segment >= 0 && segment < (int)_segments.size(), 0.0f);
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return _segments[segment]._from;
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}
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/**
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* Returns the t value of the end of this segment.
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*/
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INLINE PN_stdfloat NurbsBasisVector::
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get_to(int segment) const {
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nassertr(segment >= 0 && segment < (int)_segments.size(), 0.0f);
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return _segments[segment]._to;
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}
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/**
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* Returns the basis matrix associated with the nth segment. This is the pure
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* matrix based on the knot vector over the segment; it does not depend on the
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* control vertices.
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*/
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INLINE const LMatrix4 &NurbsBasisVector::
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get_basis(int segment) const {
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nassertr(segment >= 0 && segment < (int)_segments.size(), LMatrix4::ident_mat());
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return _segments[segment]._basis;
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}
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/**
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* Scales the value of t into the range [0, 1] corresponding to [from, to].
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* Returns the scaled value.
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*/
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INLINE PN_stdfloat NurbsBasisVector::
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scale_t(int segment, PN_stdfloat t) const {
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nassertr(segment >= 0 && segment < (int)_segments.size(), 0.0f);
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PN_stdfloat from = _segments[segment]._from;
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PN_stdfloat to = _segments[segment]._to;
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t = (t - from) / (to - from);
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return std::min(std::max(t, (PN_stdfloat)0.0), (PN_stdfloat)1.0);
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}
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