double QgsGeometryUtils::distanceToVertex( const QgsAbstractGeometryV2 &geom, const QgsVertexId &id )
{
double currentDist = 0;
QgsVertexId vertexId;
QgsPointV2 vertex;
QgsPointV2 previousVertex;
bool first = true;
while ( geom.nextVertex( vertexId, vertex ) )
{
if ( !first )
{
currentDist += sqrt( QgsGeometryUtils::sqrDistance2D( previousVertex, vertex ) );
}
previousVertex = vertex;
first = false;
if ( vertexId == id )
{
//found target vertex
return currentDist;
}
}
//could not find target vertex
return -1;
}
QgsPointV2 QgsGeometryUtils::closestVertex( const QgsAbstractGeometryV2& geom, const QgsPointV2& pt, QgsVertexId& id )
{
double minDist = std::numeric_limits<double>::max();
double currentDist = 0;
QgsPointV2 minDistPoint;
QgsVertexId vertexId;
QgsPointV2 vertex;
while ( geom.nextVertex( vertexId, vertex ) )
{
currentDist = QgsGeometryUtils::sqrDistance2D( pt, vertex );
// The <= is on purpose: for geometries with closing vertices, this ensures
// that the closing vertex is retuned. For the node tool, the rubberband
// of the closing vertex is above the opening vertex, hence with the <=
// situations where the covered opening vertex rubberband is selected are
// avoided.
if ( currentDist <= minDist )
{
minDist = currentDist;
minDistPoint = vertex;
id.part = vertexId.part;
id.ring = vertexId.ring;
id.vertex = vertexId.vertex;
}
}
return minDistPoint;
}
void QgsGeometryRubberBand::paint( QPainter* painter )
{
if ( !mGeometry || !painter )
{
return;
}
painter->save();
painter->translate( -pos() );
if ( mGeometryType == QGis::Polygon )
{
painter->setBrush( mBrush );
}
else
{
painter->setBrush( Qt::NoBrush );
}
painter->setPen( mPen );
QgsAbstractGeometryV2* paintGeom = mGeometry->clone();
paintGeom->transform( mMapCanvas->getCoordinateTransform()->transform() );
paintGeom->draw( *painter );
//draw vertices
QgsVertexId vertexId;
QgsPointV2 vertex;
while ( paintGeom->nextVertex( vertexId, vertex ) )
{
drawVertex( painter, vertex.x(), vertex.y() );
}
delete paintGeom;
painter->restore();
}