inline void clipEdge( bool closePolygon,
PointBuffer<Point> &points, PointBuffer<Point> &clippedPoints ) const
{
clippedPoints.reset();
if ( points.size() < 2 )
{
if ( points.size() == 1 )
clippedPoints.add( points[0] );
return;
}
const Edge edge( d_clipRect.x(), d_clipRect.x() + d_clipRect.width(),
d_clipRect.y(), d_clipRect.y() + d_clipRect.height() );
int lastPos, start;
if ( closePolygon )
{
start = 0;
lastPos = points.size() - 1;
}
else
{
start = 1;
lastPos = 0;
if ( edge.isInside( points[0] ) )
clippedPoints.add( points[0] );
}
const uint nPoints = points.size();
for ( uint i = start; i < nPoints; i++ )
{
const Point &p1 = points[i];
const Point &p2 = points[lastPos];
if ( edge.isInside( p1 ) )
{
if ( edge.isInside( p2 ) )
{
clippedPoints.add( p1 );
}
else
{
clippedPoints.add( edge.intersection( p1, p2 ) );
clippedPoints.add( p1 );
}
}
else
{
if ( edge.isInside( p2 ) )
{
clippedPoints.add( edge.intersection( p1, p2 ) );
}
}
lastPos = i;
}
}
