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fix polar coordinates

This commit is contained in:
Massimiliano Corsini 2006-11-15 15:34:39 +00:00
parent 4687fa762f
commit 900a46600e
1 changed files with 31 additions and 8 deletions
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39
vcg/space/point3.h
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@ -24,6 +24,9 @@
History History
$Log: not supported by cvs2svn $ $Log: not supported by cvs2svn $
Revision 1.26 2006/11/13 13:03:45 ponchio
Added GetBBox in Point3 (declaration) the body of the function is in box3.h
Revision 1.25 2006/10/13 12:59:24 cignoni Revision 1.25 2006/10/13 12:59:24 cignoni
Added **explicit** constructor from three coords of a different scalartype Added **explicit** constructor from three coords of a different scalartype
@ -326,19 +329,39 @@ public:
if(n>0.0) { _v[0] /= n; _v[1] /= n; _v[2] /= n; } if(n>0.0) { _v[0] /= n; _v[1] /= n; _v[2] /= n; }
return *this; return *this;
} }
// Convert to polar coordinates
void ToPolar( P3ScalarType & ro, P3ScalarType & theta, P3ScalarType & fi ) const /**
* Convert to polar coordinates from cartesian coordinates.
*
* Theta is the azimuth angle and ranges between [0, 360) degrees.
* Phi is the elevation angle (not the polar angle) and ranges between [-90, 90] degrees.
*
* /note Note that instead of the classical polar angle, which ranges between
* 0 and 180 degrees we opt for the elevation angle to obtain a more
* intuitive spherical coordinate system.
*/
void ToPolar(P3ScalarType &ro, P3ScalarType &theta, P3ScalarType &phi) const
{ {
ro = Norm(); ro = Norm();
theta = (P3ScalarType)atan2( _v[1], _v[0] ); theta = (P3ScalarType)atan2(_v[2], _v[0]);
fi = (P3ScalarType)acos( _v[2]/ro ); phi = (P3ScalarType)asin(_v[1]/ro);
} }
void FromPolar( const P3ScalarType & ro, const P3ScalarType & theta, const P3ScalarType & phi ) /**
* Convert from polar coordinates to cartesian coordinates.
*
* Theta is the azimuth angle and ranges between [0, 360) degrees.
* Phi is the elevation angle (not the polar angle) and ranges between [-90, 90] degrees.
*
* \note Note that instead of the classical polar angle, which ranges between
* 0 and 180 degrees, we opt for the elevation angle to obtain a more
* intuitive spherical coordinate system.
*/
void FromPolar(const P3ScalarType &ro, const P3ScalarType &theta, const P3ScalarType &phi)
{ {
_v[0]= ro*cos(theta)*sin(phi); _v[0]= ro*cos(theta)*cos(phi);
_v[1]= ro*sin(theta)*sin(phi); _v[1]= ro*sin(phi);
_v[2]= ro*cos(phi); _v[2]= ro*sin(theta)*cos(phi);
} }
Box3<P3ScalarType> GetBBox(Box3<P3ScalarType> &bb) const; Box3<P3ScalarType> GetBBox(Box3<P3ScalarType> &bb) const;