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/*
* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TRINITYSERVER_SPLINE_H
#define TRINITYSERVER_SPLINE_H
#include "MovementTypedefs.h"
#include "Errors.h"
#include <G3D/Vector3.h>
#include <limits>
#include <vector>
namespace Movement {
class SplineBase
{
public:
typedef int index_type;
typedef std::vector<Vector3> ControlArray;
enum EvaluationMode
{
ModeLinear,
ModeCatmullrom,
ModeBezier3_Unused,
UninitializedMode,
ModesEnd
};
protected:
ControlArray points;
index_type index_lo;
index_type index_hi;
uint8 m_mode;
bool cyclic;
float initialOrientation;
// could be modified, affects segment length evaluation precision
// lesser value saves more performance in cost of lover precision
// minimal value is 1
// client's value is 20, blizzs use 2-3 steps to compute length
index_type stepsPerSegment = 3;
protected:
void EvaluateLinear(index_type, float, Vector3&) const;
void EvaluateCatmullRom(index_type, float, Vector3&) const;
void EvaluateBezier3(index_type, float, Vector3&) const;
typedef void (SplineBase::*EvaluationMethtod)(index_type, float, Vector3&) const;
static EvaluationMethtod evaluators[ModesEnd];
void EvaluateDerivativeLinear(index_type, float, Vector3&) const;
void EvaluateDerivativeCatmullRom(index_type, float, Vector3&) const;
void EvaluateDerivativeBezier3(index_type, float, Vector3&) const;
static EvaluationMethtod derivative_evaluators[ModesEnd];
float SegLengthLinear(index_type) const;
float SegLengthCatmullRom(index_type) const;
float SegLengthBezier3(index_type) const;
typedef float (SplineBase::*SegLenghtMethtod)(index_type) const;
static SegLenghtMethtod seglengths[ModesEnd];
void InitLinear(Vector3 const*, index_type, index_type);
void InitCatmullRom(Vector3 const*, index_type, index_type);
void InitBezier3(Vector3 const*, index_type, index_type);
typedef void (SplineBase::*InitMethtod)(Vector3 const*, index_type, index_type);
static InitMethtod initializers[ModesEnd];
void UninitializedSplineEvaluationMethod(index_type, float, Vector3&) const { ABORT(); }
float UninitializedSplineSegLenghtMethod(index_type) const { ABORT(); return 0.0f; }
void UninitializedSplineInitMethod(Vector3 const*, index_type, index_type) { ABORT(); }
public:
explicit SplineBase();
SplineBase(SplineBase const& right) = delete;
SplineBase(SplineBase&& right) = delete;
SplineBase& operator=(SplineBase const& right) = delete;
SplineBase& operator=(SplineBase&& right) = delete;
virtual ~SplineBase();
/** Caclulates the position for given segment Idx, and percent of segment length t
@param t - percent of segment length, assumes that t in range [0, 1]
@param Idx - spline segment index, should be in range [first, last)
*/
void evaluate_percent(index_type Idx, float u, Vector3& c) const {(this->*evaluators[m_mode])(Idx, u, c);}
/** Caclulates derivation in index Idx, and percent of segment length t
@param Idx - spline segment index, should be in range [first, last)
@param t - percent of spline segment length, assumes that t in range [0, 1]
*/
void evaluate_derivative(index_type Idx, float u, Vector3& hermite) const {(this->*derivative_evaluators[m_mode])(Idx, u, hermite);}
/** Bounds for spline indexes. All indexes should be in range [first, last). */
index_type first() const { return index_lo;}
index_type last() const { return index_hi;}
bool empty() const { return index_lo == index_hi;}
EvaluationMode mode() const { return (EvaluationMode)m_mode;}
bool isCyclic() const { return cyclic;}
ControlArray const& getPoints() const { return points; }
index_type getPointCount() const { return index_type(points.size());}
Vector3 const& getPoint(index_type i) const { return points[i]; }
/** Initializes spline. Don't call other methods while spline not initialized. */
void init_spline(const Vector3 * controls, index_type count, EvaluationMode m, float orientation = 0.0f);
void init_cyclic_spline(const Vector3 * controls, index_type count, EvaluationMode m, index_type cyclic_point, float orientation = 0.0f);
/** As i can see there are a lot of ways how spline can be initialized
would be no harm to have some custom initializers. */
template<class Init>
void init_spline_custom(Init& initializer)
{
initializer(m_mode, cyclic, points, index_lo, index_hi);
}
virtual void clear();
/** Calculates distance between [i; i+1] points, assumes that index i is in bounds. */
float SegLength(index_type i) const { return (this->*seglengths[m_mode])(i);}
void set_steps_per_segment(index_type newStepsPerSegment) { stepsPerSegment = newStepsPerSegment; }
std::string ToString() const;
};
template<typename length_type>
class Spline : public SplineBase
{
public:
typedef length_type LengthType;
typedef std::vector<length_type> LengthArray;
protected:
LengthArray lengths;
index_type computeIndexInBoundsAtLength(length_type length) const;
public:
explicit Spline(){ }
/** Calculates the position for given t
@param t - percent of spline's length, assumes that t in range [0, 1]. */
void evaluate_percent(float t, Vector3 & c) const;
using SplineBase::evaluate_percent;
/** Calculates derivation for given t
@param t - percent of spline's length, assumes that t in range [0, 1]. */
void evaluate_derivative(float t, Vector3& hermite) const;
using SplineBase::evaluate_derivative;
// Assumes that t in range [0, 1]
index_type computeIndexInBounds(float t) const;
void computeIndex(float t, index_type& out_idx, float& out_u) const;
/** Initializes lengths with SplineBase::SegLength method. */
void initLengths();
/** Initializes lengths in some custom way
Note that value returned by cacher must be greater or equal to previous value. */
template<class T>
void initLengths(T& cacher)
{
index_type i = index_lo;
lengths.resize(index_hi+1);
length_type prev_length = 0, new_length = 0;
while (i < index_hi)
{
new_length = cacher(*this, i);
// length overflowed, assign to max positive value
if (new_length < 0)
new_length = std::numeric_limits<length_type>::max();
lengths[++i] = new_length;
ASSERT(prev_length <= new_length);
prev_length = new_length;
}
}
/** Returns length of the whole spline. */
length_type length() const
{
if (lengths.empty())
return 0;
return lengths[index_hi];
}
/** Returns length between given nodes. */
length_type length(index_type first, index_type last) const { return lengths[last]-lengths[first];}
length_type length(index_type Idx) const { return lengths[Idx];}
void set_length(index_type i, length_type length) { lengths[i] = length;}
void clear() override;
};
}
#include "SplineImpl.h"
#endif // TRINITYSERVER_SPLINE_H
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