C++ (Cpp) QgsPointSequence::size示例

示例#1

文件： qgscircularstring.cpp 项目： enzogis/QGIS

void QgsCircularString::setPoints( const QgsPointSequence &points )
{
  clearCache();

  if ( points.empty() )
  {
    mWkbType = QgsWkbTypes::CircularString;
    mX.clear();
    mY.clear();
    mZ.clear();
    mM.clear();
    return;
  }

  //get wkb type from first point
  const QgsPoint &firstPt = points.at( 0 );
  bool hasZ = firstPt.is3D();
  bool hasM = firstPt.isMeasure();

  setZMTypeFromSubGeometry( &firstPt, QgsWkbTypes::CircularString );

  mX.resize( points.size() );
  mY.resize( points.size() );
  if ( hasZ )
  {
    mZ.resize( points.size() );
  }
  else
  {
    mZ.clear();
  }
  if ( hasM )
  {
    mM.resize( points.size() );
  }
  else
  {
    mM.clear();
  }

  for ( int i = 0; i < points.size(); ++i )
  {
    mX[i] = points[i].x();
    mY[i] = points[i].y();
    if ( hasZ )
    {
      double z = points.at( i ).z();
      mZ[i] = std::isnan( z ) ? 0 : z;
    }
    if ( hasM )
    {
      double m = points.at( i ).m();
      mM[i] = std::isnan( m ) ? 0 : m;
    }
  }
}

示例#2

文件： qgscircularstring.cpp 项目： cayetanobv/QGIS

void QgsCircularString::setPoints( const QgsPointSequence &points )
{
  clearCache();

  if ( points.size() < 1 )
  {
    mWkbType = QgsWkbTypes::Unknown;
    mX.clear();
    mY.clear();
    mZ.clear();
    mM.clear();
    return;
  }

  //get wkb type from first point
  const QgsPointV2 &firstPt = points.at( 0 );
  bool hasZ = firstPt.is3D();
  bool hasM = firstPt.isMeasure();

  setZMTypeFromSubGeometry( &firstPt, QgsWkbTypes::CircularString );

  mX.resize( points.size() );
  mY.resize( points.size() );
  if ( hasZ )
  {
    mZ.resize( points.size() );
  }
  else
  {
    mZ.clear();
  }
  if ( hasM )
  {
    mM.resize( points.size() );
  }
  else
  {
    mM.clear();
  }

  for ( int i = 0; i < points.size(); ++i )
  {
    mX[i] = points[i].x();
    mY[i] = points[i].y();
    if ( hasZ )
    {
      mZ[i] = points[i].z();
    }
    if ( hasM )
    {
      mM[i] = points[i].m();
    }
  }
}

示例#3

文件： qgslinestring.cpp 项目： wongjimsan/QGIS

void QgsLineString::setPoints( const QgsPointSequence &points )
{
  clearCache(); //set bounding box invalid

  if ( points.isEmpty() )
  {
    clear();
    return;
  }

  //get wkb type from first point
  const QgsPointV2& firstPt = points.at( 0 );
  bool hasZ = firstPt.is3D();
  bool hasM = firstPt.isMeasure();

  setZMTypeFromSubGeometry( &firstPt, QgsWkbTypes::LineString );

  mX.resize( points.size() );
  mY.resize( points.size() );
  if ( hasZ )
  {
    mZ.resize( points.size() );
  }
  else
  {
    mZ.clear();
  }
  if ( hasM )
  {
    mM.resize( points.size() );
  }
  else
  {
    mM.clear();
  }

  for ( int i = 0; i < points.size(); ++i )
  {
    mX[i] = points.at( i ).x();
    mY[i] = points.at( i ).y();
    if ( hasZ )
    {
      mZ[i] = points.at( i ).z();
    }
    if ( hasM )
    {
      mM[i] = points.at( i ).m();
    }
  }
}

示例#4

文件： qgscircularstring.cpp 项目： cayetanobv/QGIS

void QgsCircularString::addToPainterPath( QPainterPath &path ) const
{
  int nPoints = numPoints();
  if ( nPoints < 1 )
  {
    return;
  }

  if ( path.isEmpty() || path.currentPosition() != QPointF( mX[0], mY[0] ) )
  {
    path.moveTo( QPointF( mX[0], mY[0] ) );
  }

  for ( int i = 0; i < ( nPoints - 2 ) ; i += 2 )
  {
    QgsPointSequence pt;
    segmentize( QgsPointV2( mX[i], mY[i] ), QgsPointV2( mX[i + 1], mY[i + 1] ), QgsPointV2( mX[i + 2], mY[i + 2] ), pt );
    for ( int j = 1; j < pt.size(); ++j )
    {
      path.lineTo( pt.at( j ).x(), pt.at( j ).y() );
    }
    //arcTo( path, QPointF( mX[i], mY[i] ), QPointF( mX[i + 1], mY[i + 1] ), QPointF( mX[i + 2], mY[i + 2] ) );
  }

  //if number of points is even, connect to last point with straight line (even though the circular string is not valid)
  if ( nPoints % 2 == 0 )
  {
    path.lineTo( mX[ nPoints - 1 ], mY[ nPoints - 1 ] );
  }
}