99 lines
2.1 KiB
Text
99 lines
2.1 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 parabola_src.I
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* @author drose
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* @date 2007-10-10
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*/
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/**
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* Constructs a meaningless degenerate parabola.
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*/
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INLINE_MATHUTIL FLOATNAME(LParabola)::
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FLOATNAME(LParabola)() :
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_a(FLOATNAME(LVecBase3)::zero()),
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_b(FLOATNAME(LVecBase3)::zero()),
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_c(FLOATNAME(LVecBase3)::zero())
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{
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}
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/**
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* Constructs a parabola given the three points of the parametric equation:
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* the acceleration, initial velocity, and start point.
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*/
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INLINE_MATHUTIL FLOATNAME(LParabola)::
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FLOATNAME(LParabola)(const FLOATNAME(LVecBase3) &a,
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const FLOATNAME(LVecBase3) &b,
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const FLOATNAME(LVecBase3) &c) :
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_a(a), _b(b), _c(c)
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{
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}
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/**
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*
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*/
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INLINE_MATHUTIL FLOATNAME(LParabola)::
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FLOATNAME(LParabola)(const FLOATNAME(LParabola) ©) :
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_a(copy._a),
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_b(copy._b),
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_c(copy._c)
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{
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}
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/**
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*
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*/
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INLINE_MATHUTIL void FLOATNAME(LParabola)::
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operator = (const FLOATNAME(LParabola) ©) {
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_a = copy._a;
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_b = copy._b;
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_c = copy._c;
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}
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/**
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*
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*/
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INLINE_MATHUTIL FLOATNAME(LParabola)::
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~FLOATNAME(LParabola)() {
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}
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/**
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* Returns the first point of the parabola's parametric equation: the
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* acceleration.
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*/
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INLINE_MATHUTIL const FLOATNAME(LVecBase3) &FLOATNAME(LParabola)::
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get_a() const {
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return _a;
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}
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/**
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* Returns the second point of the parabola's parametric equation: the initial
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* velocity.
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*/
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INLINE_MATHUTIL const FLOATNAME(LVecBase3) &FLOATNAME(LParabola)::
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get_b() const {
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return _b;
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}
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/**
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* Returns the third point of the parabola's parametric equation: the start
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* point.
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*/
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INLINE_MATHUTIL const FLOATNAME(LVecBase3) &FLOATNAME(LParabola)::
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get_c() const {
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return _c;
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}
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/**
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* Computes the point on the parabola at time t.
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*/
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INLINE_MATHUTIL FLOATNAME(LPoint3) FLOATNAME(LParabola)::
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calc_point(FLOATTYPE t) const {
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return _a * t * t + _b * t + _c;
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}
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