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vcglib
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added constructors : 

-Triangle2()
     -Triangle2(const CoordType &p0,const CoordType &p1,const CoordType &p2)

added functions:
     - InterpolationParameters
     - PointDistance
This commit is contained in:
Nico Pietroni 2007-01-08 09:29:58 +00:00
parent 9cbf2c1c3c
commit 191896afbb
1 changed files with 74 additions and 4 deletions
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78
vcg/space/triangle2.h
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@ -27,8 +27,9 @@
#ifndef __VCG_TRIANGLE2
#define __VCG_TRIANGLE2
#include <vcg\space\point2.h>
#include <vcg/space/triangle3.h>
#include <vcg/space/point2.h>
#include <float.h>
namespace vcg {
@ -43,18 +44,30 @@ template <class SCALAR_TRIANGLE_TYPE> class Triangle2
public:
typedef SCALAR_TRIANGLE_TYPE ScalarTriangleType;
typedef ScalarTriangleType ScalarType;
typedef Point2< ScalarType > CoordType;
typedef Point2< ScalarType > CoordType;
typedef typename Triangle2<ScalarType> TriangleType;
protected:
/// Vector of vertex pointer incident in the face
Point2<ScalarType> _v[3];
public:
Triangle2()
{}
Triangle2(const CoordType &p0,const CoordType &p1,const CoordType &p2)
{
P(0)=p0;
P(1)=p1;
P(2)=p2;
}
/// Shortcut per accedere ai punti delle facce
inline CoordType & P( const int j ) { return _v[j];}
inline CoordType & P0( const int j ) { return _v[j];}
inline CoordType & P1( const int j ) { return _v[(j+1)%3];}
inline CoordType & P2( const int j ) { return _v[(j+2)%3];}
inline const CoordType & P( const int j ) const { return _v[j];}
inline const CoordType & P0( const int j ) const { return _v[j];}
inline const CoordType & P1( const int j ) const { return _v[(j+1)%3];}
inline const CoordType & P2( const int j ) const { return _v[(j+2)%3];}
@ -62,9 +75,66 @@ public:
inline const CoordType & cP1( const int j ) const { return _v[(j+1)%3];}
inline const CoordType & cP2( const int j ) const { return _v[(j+2)%3];}
/** evaluate barycentric coordinates
@param bq Point on the face
@param a barycentric value for V(0)
@param b barycentric value for V(1)
@param c barycentric value for V(2)
@return true se bq appartain to the face, false otherwise
*/
bool InterpolationParameters(const CoordType & bq, ScalarType &a, ScalarType &b, ScalarType &c ) const
{
const ScalarType EPSILON = ScalarType(0.0001);
ScalarType v_global,v0,v1,v2;
ScalarType AreaGlobal=(P(1) - P(0)) ^ (P(2) - P(0));
ScalarType Area0=(P(2) - P(1)) ^ (bq - P(1));
ScalarType Area1=(P(0) - P(2)) ^ (bq - P(2));
ScalarType Area2=(P(1) - P(0)) ^ (bq - P(0));
/*if ((Area0>(AreaGlobal+EPSILON))||(Area1>(AreaGlobal+EPSILON))||(Area2>(AreaGlobal+EPSILON)))
return false;*/
a=Area0/AreaGlobal;
b=Area1/AreaGlobal;
c=Area2/AreaGlobal;
///test inside/outside
if((a>(ScalarType)1+EPSILON)||(b>(ScalarType)1+EPSILON)||(c>(ScalarType)1+EPSILON))
return false;
if(a>1)
a=(ScalarType)1;
if(b>1)
b=(ScalarType)1;
if(c>1)
c=(ScalarType)1;
return true;
}
///return the distance to the point q and neighors point p
void PointDistance(const CoordType & q,
typename ScalarType & dist,
typename CoordType & p ) const
{
dist=FLT_MAX;
///find distance to each segment and take minimum
for (int i=0;i<3;i++)
{
vcg::Segment2<float> s=vcg::Segment2<float>(P(i),P((i+1)%3));
CoordType clos=ClosestPoint<ScalarType>(s,q);
ScalarType dis_test=(clos-q).Norm();
if (dis_test<dist)
{
dist=dis_test;
p=clos;
}
}
}
}; //end Class
} // end namespace
#endif