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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "titanic/star_control/dvector.h"
#include "titanic/star_control/dmatrix.h"
#include "common/algorithm.h"
namespace Titanic {
double DVector::normalize() {
double hyp = sqrt(_x * _x + _y * _y + _z * _z);
assert(hyp);
_x *= 1.0 / hyp;
_y *= 1.0 / hyp;
_z *= 1.0 / hyp;
return hyp;
}
double DVector::getDistance(const DVector &src) {
return sqrt((src._x - _x) * (src._x - _x) + (src._y - _y) * (src._y - _y) + (src._z - _z) * (src._z - _z));
}
DVector DVector::fn1(const DMatrix &m) {
DVector dest;
dest._x = m._row3._x * _z + m._row2._x * _y + m._row1._x * _x + m._row4._x;
dest._y = m._row2._y * _y + m._row3._y * _z + m._row1._y * _x + m._row4._y;
dest._z = m._row3._z * _z + m._row2._z * _y + m._row1._z * _x + m._row4._z;
return dest;
}
void DVector::fn2(double angle) {
const double FACTOR = 2 * M_PI / 360.0;
double sinVal = sin(angle * FACTOR);
double cosVal = cos(angle * FACTOR);
double x = cosVal * _x - sinVal * _z;
double z = cosVal * _z + sinVal * _x;
_x = x;
_z = z;
}
DVector DVector::fn3() const {
DVector vector = *this;
DVector dest;
dest._x = vector.normalize();
dest._y = acos(vector._y);
if (ABS(vector._z) < 0.00001) {
if (vector._x < 0.0) {
dest._z = 2 * M_PI - (M_PI / 2.0);
} else {
dest._z = M_PI / 2.0;
}
} else {
dest._z = atan(vector._x / vector._z);
if (vector._x < 0.0)
dest._z += 2 * M_PI;
}
return dest;
}
DMatrix DVector::fn4(const DVector &v) {
const double FACTOR = 180.0 / M_PI;
DMatrix matrix1, matrix2, matrix3, matrix4;
DVector vector1 = fn3();
matrix1.setRotationMatrix(X_AXIS, vector1._y * FACTOR);
matrix2.setRotationMatrix(Y_AXIS, -(vector1._z * FACTOR));
matrix3 = matrix1.fn4(matrix2);
matrix4 = matrix3.fn1();
vector1 = v.fn3();
matrix1.setRotationMatrix(X_AXIS, vector1._y * FACTOR);
matrix2.setRotationMatrix(Y_AXIS, -(vector1._z * FACTOR));
matrix3 = matrix1.fn4(matrix2);
return matrix4.fn4(matrix3);
}
DMatrix DVector::fn5() const {
const double FACTOR = 180.0 / M_PI;
DVector v1 = fn3();
DMatrix m1, m2;
m1.setRotationMatrix(X_AXIS, v1._y * FACTOR);
m2.setRotationMatrix(Y_AXIS, -(v1._z * FACTOR));
return m1.fn4(m2);
}
} // End of namespace Titanic
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