C++ QgsPoint函数代码示例

int QgsGml::pointsFromCoordinateString( QList<QgsPoint>& points, const QString& coordString ) const
{
  //tuples are separated by space, x/y by ','
  QStringList tuples = coordString.split( mTupleSeparator, QString::SkipEmptyParts );
  QStringList tuples_coordinates;
  double x, y;
  bool conversionSuccess;

  QStringList::const_iterator tupleIterator;
  for ( tupleIterator = tuples.constBegin(); tupleIterator != tuples.constEnd(); ++tupleIterator )
  {
    tuples_coordinates = tupleIterator->split( mCoordinateSeparator, QString::SkipEmptyParts );
    if ( tuples_coordinates.size() < 2 )
    {
      continue;
    }
    x = tuples_coordinates.at( 0 ).toDouble( &conversionSuccess );
    if ( !conversionSuccess )
    {
      continue;
    }
    y = tuples_coordinates.at( 1 ).toDouble( &conversionSuccess );
    if ( !conversionSuccess )
    {
      continue;
    }
    points.push_back( QgsPoint( x, y ) );
  }
  return 0;
}

void QgsMapToolCapture::canvasMapMoveEvent( QgsMapMouseEvent * e )
{
  bool snapped = e->isSnapped();
  QgsPoint point = e->mapPoint();

  if ( !snapped )
  {
    delete mSnappingMarker;
    mSnappingMarker = 0;
  }
  else
  {
    if ( !mSnappingMarker )
    {
      mSnappingMarker = new QgsVertexMarker( mCanvas );
      mSnappingMarker->setIconType( QgsVertexMarker::ICON_CROSS );
      mSnappingMarker->setColor( Qt::magenta );
      mSnappingMarker->setPenWidth( 3 );
    }
    mSnappingMarker->setCenter( point );
  }

  if ( !mTempRubberBand && mCaptureCurve.numPoints() > 0 )
  {
    mTempRubberBand = createRubberBand( mCaptureMode == CapturePolygon ? QGis::Polygon : QGis::Line, true );
    QgsPointV2 pt = mCaptureCurve.endPoint();
    mTempRubberBand->addPoint( QgsPoint( pt.x(), pt.y() ) );
    mTempRubberBand->addPoint( point );
  }

  if ( mCaptureMode != CapturePoint && mTempRubberBand && mCapturing )
  {
    mTempRubberBand->movePoint( point );
  }
} // mouseMoveEvent

int QgsGml::pointsFromPosListString( QList<QgsPoint>& points, const QString& coordString, int dimension ) const
{
    // coordinates separated by spaces
    QStringList coordinates = coordString.split( ' ', QString::SkipEmptyParts );

    if ( coordinates.size() % dimension != 0 )
    {
        QgsDebugMsg( "Wrong number of coordinates" );
    }

    int ncoor = coordinates.size() / dimension;
    for ( int i = 0; i < ncoor; i++ )
    {
        bool conversionSuccess;
        double x = coordinates.value( i * dimension ).toDouble( &conversionSuccess );
        if ( !conversionSuccess )
        {
            continue;
        }
        double y = coordinates.value( i * dimension + 1 ).toDouble( &conversionSuccess );
        if ( !conversionSuccess )
        {
            continue;
        }
        points.append( QgsPoint( x, y ) );
    }
    return 0;
}

double QgsComposerScaleBar::mapDiagonal() const
{
  if ( !mComposerMap )
  {
    return 0.0;
  }

  QgsRectangle composerMapRect = mComposerMap->extent();
  if ( mUnits == MapUnits )
  {
    return sqrt( composerMapRect.width() * composerMapRect.width() + composerMapRect.height() * composerMapRect.height() );
  }
  else
  {
    QgsDistanceArea da;
    da.setProjectionsEnabled( true );
    da.setSourceCrs( mComposerMap->mapRenderer()->destinationCrs().srsid() );
    QSettings s;
    da.setEllipsoid( s.value( "/qgis/measure/ellipsoid", "WGS84" ).toString() );
    double measure = da.measureLine( QgsPoint( composerMapRect.xMinimum(), composerMapRect.yMaximum() ), QgsPoint( composerMapRect.xMaximum(), composerMapRect.yMinimum() ) );
    if ( mUnits == Feet )
    {
      measure /= 0.3048;
    }
    return measure;
  }
}

void RgShortestPathWidget::setFrontPoint( const QgsPoint& pt )
{
  mPlugin->iface()->mapCanvas()->unsetMapTool( mFrontPointMapTool );
  mFrontPointLineEdit->setText( QString( "(" ) + QString().setNum( pt.x() ) + QString( "," ) +
                                QString().setNum( pt.y() ) + QString( ")" ) );
  mFrontPoint = pt;

  double mupp = mPlugin->iface()->mapCanvas()->getCoordinateTransform()->mapUnitsPerPixel() * 2;

  mrbFrontPoint->reset( QGis::Polygon );
  mrbFrontPoint->addPoint( QgsPoint( pt.x() - mupp, pt.y() - mupp ), false );
  mrbFrontPoint->addPoint( QgsPoint( pt.x() + mupp, pt.y() - mupp ), false );
  mrbFrontPoint->addPoint( QgsPoint( pt.x() + mupp, pt.y() + mupp ), false );
  mrbFrontPoint->addPoint( QgsPoint( pt.x() - mupp, pt.y() + mupp ), true );
  mrbFrontPoint->show();
} //RgShortestPathWidget::setFrontPoint( const QgsPoint& pt )

    void testSnapModeAll()
    {
      QgsMapSettings mapSettings;
      mapSettings.setOutputSize( QSize( 100, 100 ) );
      mapSettings.setExtent( QgsRectangle( 0, 0, 1, 1 ) );
      QVERIFY( mapSettings.hasValidSettings() );

      QgsSnappingUtils u;
      QgsSnappingConfig snappingConfig = u.config();
      u.setMapSettings( mapSettings );
      snappingConfig.setMode( QgsSnappingConfig::AllLayers );
      u.setConfig( snappingConfig );

      // right now there are no layers in map settings - snapping will fail

      QgsPointLocator::Match m = u.snapToMap( QPoint( 100, 100 ) );
      QVERIFY( !m.isValid() );

      // now check with our layer
      mapSettings.setLayers( QStringList() << mVL->id() );
      u.setMapSettings( mapSettings );

      QgsPointLocator::Match m2 = u.snapToMap( QPoint( 100, 100 ) );
      QVERIFY( m2.isValid() );
      QCOMPARE( m2.point(), QgsPoint( 1, 0 ) );
    }

unsigned char* QgsDistanceArea::measureLine( unsigned char* feature, double* area, bool hasZptr )
{
  unsigned char *ptr = feature + 5;
  unsigned int nPoints = *(( int* )ptr );
  ptr = feature + 9;

  QList<QgsPoint> points;
  double x, y;

  QgsDebugMsg( "This feature WKB has " + QString::number( nPoints ) + " points" );
  // Extract the points from the WKB format into the vector
  for ( unsigned int i = 0; i < nPoints; ++i )
  {
    x = *(( double * ) ptr );
    ptr += sizeof( double );
    y = *(( double * ) ptr );
    ptr += sizeof( double );
    if ( hasZptr )
    {
      // totally ignore Z value
      ptr += sizeof( double );
    }

    points.append( QgsPoint( x, y ) );
  }

  *area = measureLine( points );
  return ptr;
}

static QgsCurve *_transform_ring_to_new_base( const QgsCurve &curve, const QgsPoint &pt0, const QMatrix4x4 *toNewBase )
{
  int count = curve.numPoints();
  QVector<QgsPoint> pts;
  pts.reserve( count );
  QgsVertexId::VertexType vt;
  for ( int i = 0; i < count; ++i )
  {
    QgsPoint pt;
    curve.pointAt( i, pt, vt );
    QgsPoint pt2( QgsWkbTypes::PointZ, pt.x() - pt0.x(), pt.y() - pt0.y(), std::isnan( pt.z() ) ? 0 : pt.z() - pt0.z() );
    QVector4D v( pt2.x(), pt2.y(), pt2.z(), 0 );
    if ( toNewBase )
      v = toNewBase->map( v );

    // we also round coordinates before passing them to poly2tri triangulation in order to fix possible numerical
    // stability issues. We had crashes with nearly collinear points where one of the points was off by a tiny bit (e.g. by 1e-20).
    // See TestQgsTessellator::testIssue17745().
    //
    // A hint for a similar issue: https://github.com/greenm01/poly2tri/issues/99
    //
    //    The collinear tests uses epsilon 1e-12. Seems rounding to 12 places you still
    //    can get problems with this test when points are pretty much on a straight line.
    //    I suggest you round to 10 decimals for stability and you can live with that
    //    precision.

    pts << QgsPoint( QgsWkbTypes::PointZ, _round_coord( v.x() ), _round_coord( v.y() ), _round_coord( v.z() ) );
  }
  return new QgsLineString( pts );
}

    void eval_geometry_data()
    {
      QTest::addColumn<QString>( "string" );
      QTest::addColumn<void*>( "geomptr" );
      QTest::addColumn<bool>( "evalError" );
      QTest::addColumn<double>( "result" );

      QgsPoint point( 123, 456 );
      QgsPolyline line;
      line << QgsPoint( 1, 1 ) << QgsPoint( 4, 2 ) << QgsPoint( 3, 1 );

      QTest::newRow( "geom x" ) << "$x" << ( void* ) QgsGeometry::fromPoint( point ) << false << 123.;
      QTest::newRow( "geom y" ) << "$y" << ( void* ) QgsGeometry::fromPoint( point ) << false << 456.;
      QTest::newRow( "geom xat" ) << "xat(-1)" << ( void* ) QgsGeometry::fromPolyline( line ) << false << 3.;
      QTest::newRow( "geom yat" ) << "yat(1)" << ( void* ) QgsGeometry::fromPolyline( line ) << false << 2.;
    }

void RgShortestPathWidget::setFrontPoint( const QgsPoint& pt )
{
  mPlugin->iface()->mapCanvas()->unsetMapTool( mFrontPointMapTool );
  mFrontPointLineEdit->setText( QStringLiteral( "(%1, %2)" ).arg( QString::number( pt.x(), 'f' ),
                                QString::number( pt.y(), 'f' ) ) );
  mFrontPoint = pt;

  double mupp = mPlugin->iface()->mapCanvas()->getCoordinateTransform()->mapUnitsPerPixel() * 2;

  mrbFrontPoint->reset( QgsWkbTypes::PolygonGeometry );
  mrbFrontPoint->addPoint( QgsPoint( pt.x() - mupp, pt.y() - mupp ), false );
  mrbFrontPoint->addPoint( QgsPoint( pt.x() + mupp, pt.y() - mupp ), false );
  mrbFrontPoint->addPoint( QgsPoint( pt.x() + mupp, pt.y() + mupp ), false );
  mrbFrontPoint->addPoint( QgsPoint( pt.x() - mupp, pt.y() + mupp ), true );
  mrbFrontPoint->show();
} //RgShortestPathWidget::setFrontPoint( const QgsPoint& pt )

double QgsComposerScaleBar::mapWidth() const
{
  if ( !mComposerMap )
  {
    return 0.0;
  }

  QgsRectangle composerMapRect = mComposerMap->extent();
  if ( mUnits == MapUnits )
  {
    return composerMapRect.width();
  }
  else
  {
    QgsDistanceArea da;
    da.setEllipsoidalMode( mComposerMap->mapRenderer()->hasCrsTransformEnabled() );
    da.setSourceCrs( mComposerMap->mapRenderer()->destinationCrs().srsid() );
    da.setEllipsoid( QgsProject::instance()->readEntry( "Measure", "/Ellipsoid", "WGS84" ) );

    double measure = da.measureLine( QgsPoint( composerMapRect.xMinimum(), composerMapRect.yMinimum() ), QgsPoint( composerMapRect.xMaximum(), composerMapRect.yMinimum() ) );
    if ( mUnits == Feet )
    {
      measure /= 0.3048;
    }
    return measure;
  }
}

const unsigned char* QgsDistanceArea::measureLine( const unsigned char* feature, double* area, bool hasZptr )
{
  QgsConstWkbPtr wkbPtr( feature + 1 + sizeof( int ) );
  int nPoints;
  wkbPtr >> nPoints;

  QList<QgsPoint> points;
  double x, y;

  QgsDebugMsg( "This feature WKB has " + QString::number( nPoints ) + " points" );
  // Extract the points from the WKB format into the vector
  for ( int i = 0; i < nPoints; ++i )
  {
    wkbPtr >> x >> y;
    if ( hasZptr )
    {
      // totally ignore Z value
      wkbPtr += sizeof( double );
    }

    points.append( QgsPoint( x, y ) );
  }

  *area = measureLine( points );
  return wkbPtr;
}

void QgsMapToolPinLabels::highlightLabel( const QgsLabelPosition& labelpos,
    const QString& id,
    const QColor& color )
{
  QgsRectangle rect = labelpos.labelRect;
  QgsRubberBand *rb = new QgsRubberBand( mCanvas, QGis::Polygon );
  rb->addPoint( QgsPoint( rect.xMinimum(), rect.yMinimum() ) );
  rb->addPoint( QgsPoint( rect.xMinimum(), rect.yMaximum() ) );
  rb->addPoint( QgsPoint( rect.xMaximum(), rect.yMaximum() ) );
  rb->addPoint( QgsPoint( rect.xMaximum(), rect.yMinimum() ) );
  rb->addPoint( QgsPoint( rect.xMinimum(), rect.yMinimum() ) );
  rb->setColor( color );
  rb->setWidth( 0 );
  rb->show();

  mHighlights.insert( id, rb );
}

void QgsRubberBand::setToCanvasRectangle( const QRect& rect )
{
  if ( !mMapCanvas )
  {
    return;
  }

  const QgsMapToPixel* transform = mMapCanvas->getCoordinateTransform();
  QgsPoint ll = transform->toMapCoordinates( rect.left(), rect.bottom() );
  QgsPoint ur = transform->toMapCoordinates( rect.right(), rect.top() );

  reset( QGis::Polygon );
  addPoint( ll, false );
  addPoint( QgsPoint( ur.x(), ll.y() ), false );
  addPoint( ur, false );
  addPoint( QgsPoint( ll.x(), ur.y() ), true );
}

QgsPoint QgsLineString::startPoint() const
{
  if ( numPoints() < 1 )
  {
    return QgsPoint();
  }
  return pointN( 0 );
}