/*
=============
SetPointList
Точки необходимо задавать обходя по часовой стрелке
=============
*/
void CollisionElementPolygon::SetPointList( const PointList &setPoints ) {
if( setPoints.size() < 3 ) {
__log.PrintInfo( Filelevel_ERROR, "CollisionElementPolygon::SetPointList => not enough points" );
return;
}
this->pointsSource = setPoints;
this->pointsResult.clear();
this->pointsResult.resize( setPoints.size() + 1 );
//copy src to result
int num = 0;
PointList::iterator iter, iterEnd = this->pointsSource.end();
for( iter = this->pointsSource.begin(); iter != iterEnd; ++iter, ++num ) {
this->pointsResult[ num ] = *iter;
}
this->pointsResult[ this->pointsResult.size() - 1 ] = this->pointsSource[ 0 ];
Vec2 radiusVector( Vec2Null );
Vec2 edge0, edge1, edge2;
num = 0;
iterEnd = this->pointsResult.end();
for( iter = this->pointsResult.begin(); iter != iterEnd; ++iter, ++num ) {
Point *point = &( *iter );
radiusVector.Set( max( fabs( point->x ), radiusVector.x ), max( fabs( point->y ), radiusVector.y ) );
if( num > 1 ) {
//нормальзовать не нужно т.к. нужно не значение, а только знак
edge0 = this->pointsResult[ num - 1 ] - this->pointsResult[ num - 2 ];
edge1 = this->pointsResult[ num ] - this->pointsResult[ num - 2 ];
edge1.Rotate90CW();
float sign = edge0.Dot( edge1 );
if( sign > 0 ) {
__log.PrintInfo( Filelevel_ERROR, "CollisionElementPolygon::SetPointList => points[%d] is not clockwise", num );
this->pointsResult.clear();
this->pointsSource.clear();
return;
}
}
}//for
this->_rect->radius2 = Square( radiusVector.Length() );
//формирования списка разделающих осей
Vec2 axis;
Vec2 tmpVec2;
iterEnd = this->pointsResult.end();
iter = this->pointsResult.begin();
num = 1;
for( ++iter; iter != iterEnd; ++iter, ++num ) {
tmpVec2 = this->pointsResult[ num ] - this->pointsResult[ num - 1 ];
axis.Set( tmpVec2.x, tmpVec2.y );
axis.Rotate90CW();
if( axis.x < 0 ) {
axis *= -1.0f;
} else if( axis.y < 0.0f ) {
axis *= -1.0f;
}
axis.Normalize();
if( !this->_IsAxisExists( axis ) ) {
this->axes.push_back( axis );
}
}//foreach pointsSource
}//SetPointList
