C++ (Cpp) QgsCircle Beispiele

Beispiel #1

Datei: qgscircle.cpp Projekt: ndavid/QGIS

QgsCircle QgsCircle::fromExtent( const QgsPoint &pt1, const QgsPoint &pt2 )
{
  double delta_x = qAbs( pt1.x() - pt2.x() );
  double delta_y = qAbs( pt1.x() - pt2.y() );
  if ( !qgsDoubleNear( delta_x, delta_y ) )
  {
    return QgsCircle();
  }

  return QgsCircle( QgsGeometryUtils::midpoint( pt1, pt2 ), delta_x / 2.0, 0 );
}

Beispiel #2

Datei: qgsmaptoolcircle3points.cpp Projekt: phborba/QGIS

void QgsMapToolCircle3Points::cadCanvasMoveEvent( QgsMapMouseEvent *e )
{
  QgsPoint point = mapPoint( *e );

  if ( mTempRubberBand )
  {
    switch ( mPoints.size() )
    {
      case 1:
      {
        std::unique_ptr<QgsLineString> line( new QgsLineString() );
        line->addVertex( mPoints.at( 0 ) );
        line->addVertex( point );
        mTempRubberBand->setGeometry( line.release() );
      }
      break;
      case 2:
      {
        mCircle = QgsCircle().from3Points( mPoints.at( 0 ), mPoints.at( 1 ), point );
        mTempRubberBand->setGeometry( mCircle.toCircularString( true ) );
      }
      break;
      default:
        break;
    }
  }
}

Beispiel #3

Datei: qgscircle.cpp Projekt: ndavid/QGIS

QgsCircle QgsCircle::from2Points( const QgsPoint &pt1, const QgsPoint &pt2 )
{
  QgsPoint center = QgsGeometryUtils::midpoint( pt1, pt2 );
  double azimuth = QgsGeometryUtils::lineAngle( pt1.x(), pt1.y(), pt2.x(), pt2.y() ) * 180.0 / M_PI;
  double radius = pt1.distance( pt2 );

  return QgsCircle( center, radius, azimuth );
}

Beispiel #4

Datei: qgsmaptoolcirclecenterpoint.cpp Projekt: AlisterH/Quantum-GIS

void QgsMapToolCircleCenterPoint::cadCanvasMoveEvent( QgsMapMouseEvent *e )
{
  QgsPoint point = mapPoint( *e );

  mSnapIndicator->setMatch( e->mapPointMatch() );

  if ( mTempRubberBand )
  {
    mCircle = QgsCircle().fromCenterPoint( mPoints.at( 0 ), point );
    mTempRubberBand->setGeometry( mCircle.toCircularString( true ) );
  }
}

Beispiel #5

Datei: qgsmaptooladdcircle.cpp Projekt: AlisterH/Quantum-GIS

void QgsMapToolAddCircle::clean()
{
  if ( mTempRubberBand )
  {
    delete mTempRubberBand;
    mTempRubberBand = nullptr;
  }

  mPoints.clear();

  if ( mParentTool )
  {
    mParentTool->deleteTempRubberBand();
  }

  mCircle = QgsCircle();

  QgsVectorLayer *vLayer = static_cast<QgsVectorLayer *>( QgisApp::instance()->activeLayer() );
  if ( vLayer )
    mLayerType = vLayer->geometryType();
}

Beispiel #6

Datei: qgsregularpolygon.cpp Projekt: peterisb/QGIS

QgsCircle QgsRegularPolygon::circumscribedCircle() const
{
  // TODO: inclined circle
  return QgsCircle( mCenter, mRadius );
}

Beispiel #7

Datei: qgsregularpolygon.cpp Projekt: peterisb/QGIS

QgsCircle QgsRegularPolygon::inscribedCircle() const
{
  // TODO: inclined circle
  return QgsCircle( mCenter, apothem() );
}

Beispiel #8

Datei: qgscircle.cpp Projekt: ndavid/QGIS

QgsCircle QgsCircle::from3Points( const QgsPoint &pt1, const QgsPoint &pt2, const QgsPoint &pt3, double epsilon )
{
  QgsPoint p1, p2, p3;

  if ( !isPerpendicular( pt1, pt2, pt3, epsilon ) )
  {
    p1 = pt1;
    p2 = pt2;
    p3 = pt3;
  }
  else if ( !isPerpendicular( pt1, pt3, pt2, epsilon ) )
  {
    p1 = pt1;
    p2 = pt3;
    p3 = pt2;
  }
  else if ( !isPerpendicular( pt2, pt1, pt3, epsilon ) )
  {
    p1 = pt2;
    p2 = pt1;
    p3 = pt3;
  }
  else if ( !isPerpendicular( pt2, pt3, pt1, epsilon ) )
  {
    p1 = pt2;
    p2 = pt3;
    p3 = pt1;
  }
  else if ( !isPerpendicular( pt3, pt2, pt1, epsilon ) )
  {
    p1 = pt3;
    p2 = pt2;
    p3 = pt1;
  }
  else if ( !isPerpendicular( pt3, pt1, pt2, epsilon ) )
  {
    p1 = pt3;
    p2 = pt1;
    p3 = pt2;
  }
  else
  {
    return QgsCircle();
  }
  QgsPoint center = QgsPoint();
  double radius = -0.0;
  // Paul Bourke's algorithm
  double yDelta_a = p2.y() - p1.y();
  double xDelta_a = p2.x() - p1.x();
  double yDelta_b = p3.y() - p2.y();
  double xDelta_b = p3.x() - p2.x();

  if ( qgsDoubleNear( xDelta_a, 0.0, epsilon ) || qgsDoubleNear( xDelta_b, 0.0, epsilon ) )
  {
    return QgsCircle();
  }

  double aSlope = yDelta_a / xDelta_a;
  double bSlope = yDelta_b / xDelta_b;

  if ( ( qAbs( xDelta_a ) <= epsilon ) && ( qAbs( yDelta_b ) <= epsilon ) )
  {
    center.setX( 0.5 * ( p2.x() + p3.x() ) );
    center.setY( 0.5 * ( p1.y() + p2.y() ) );
    radius = center.distance( pt1 );

    return QgsCircle( center, radius );
  }

  if ( qAbs( aSlope - bSlope ) <= epsilon )
  {
    return QgsCircle();
  }

  center.setX(
    ( aSlope * bSlope * ( p1.y() - p3.y() ) +
      bSlope * ( p1.x() + p2.x() ) -
      aSlope * ( p2.x() + p3.x() ) ) /
    ( 2.0 * ( bSlope - aSlope ) )
  );
  center.setY(
    -1.0 * ( center.x() - ( p1.x() + p2.x() ) / 2.0 ) /
    aSlope + ( p1.y() + p2.y() ) / 2.0
  );

  radius = center.distance( p1 );

  return QgsCircle( center, radius );
}

Beispiel #9

Datei: qgscircle.cpp Projekt: ndavid/QGIS

QgsCircle QgsCircle::fromCenterPoint( const QgsPoint &center, const QgsPoint &pt1 )
{
  double azimuth = QgsGeometryUtils::lineAngle( center.x(), center.y(), pt1.x(), pt1.y() ) * 180.0 / M_PI;
  return QgsCircle( center, center.distance( pt1 ), azimuth );
}

Beispiel #10

Datei: qgscircle.cpp Projekt: ndavid/QGIS

QgsCircle QgsCircle::fromCenterDiameter( const QgsPoint &center, double diameter, double azimuth )
{
  return QgsCircle( center, diameter / 2.0, azimuth );
}

Beispiel #11

Datei: qgstriangle.cpp Projekt: GeoCat/QGIS

QgsCircle QgsTriangle::inscribedCircle() const
{
  return QgsCircle( inscribedCenter(), inscribedRadius() );
}

Beispiel #12

Datei: qgstriangle.cpp Projekt: GeoCat/QGIS

QgsCircle QgsTriangle::circumscribedCircle() const
{
  return QgsCircle( circumscribedCenter(), circumscribedRadius() );
}