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Better error handling for polygon clipping

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git-svn-id: http://svn.osgeo.org/qgis/trunk@15817 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
mhugent 2011-04-24 20:59:54 +00:00
parent ba0e5ad391
commit ab95bbfd99
1 changed files with 4 additions and 10 deletions
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14
src/core/qgsclipper.h
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@ -421,18 +421,12 @@ inline QPointF QgsClipper::intersectRect( const QPointF& pt1,
break;
}
if ( std::abs( r_d ) > SMALL_NUM && std::abs( r_n ) > SMALL_NUM )
{ // they cross
double r = r_n / r_d;
return QPointF( x1 + r*( x2 - x1 ), y1 + r*( y2 - y1 ) );
}
else
double r = 0;
if ( !doubleNear( r_d, 0.0 ) )
{
// Should never get here, but if we do for some reason, cause a
// clunk because something else is wrong if we do.
Q_ASSERT( std::abs( r_d ) > SMALL_NUM && std::abs( r_n ) > SMALL_NUM );
return QPointF();
r = r_n / r_d;
}
return QPointF( x1 + r*( x2 - x1 ), y1 + r*( y2 - y1 ) );
}
inline void QgsClipper::clipStartTop( double& x0, double& y0, const double& x1, const double& y1, double yMax )