C++ (Cpp) QgsPointV2::ry Examples

Example #1

File: qgsmaptooladdcircularstring.cpp Project: Zakui/QGIS

void QgsMapToolAddCircularString::updateCenterPointRubberBand( const QgsPointV2& pt )
{
  if ( !mShowCenterPointRubberBand || !mCenterPointRubberBand || mPoints.size() < 2 )
  {
    return;
  }

  if (( mPoints.size() ) % 2 != 0 )
  {
    return;
  }

  //create circular string
  QgsCircularStringV2* cs = new QgsCircularStringV2();
  QgsPointSequenceV2 csPoints;
  csPoints.append( mPoints.at( mPoints.size() - 2 ) );
  csPoints.append( mPoints.at( mPoints.size() - 1 ) );
  csPoints.append( pt );
  cs->setPoints( csPoints );

  QgsPointV2 center;
  double radius;
  QgsGeometryUtils::circleCenterRadius( csPoints.at( 0 ), csPoints.at( 1 ), csPoints.at( 2 ), radius, center.rx(), center.ry() );

  QgsLineStringV2* segment1 = new QgsLineStringV2();
  segment1->addVertex( center );
  segment1->addVertex( csPoints.at( 0 ) );

  QgsLineStringV2* segment2 = new QgsLineStringV2();
  segment2->addVertex( csPoints.at( 2 ) );
  segment2->addVertex( center );

  QgsCompoundCurveV2* cc = new QgsCompoundCurveV2();
  cc->addCurve( segment1 );
  cc->addCurve( cs );
  cc->addCurve( segment2 );

  QgsCurvePolygonV2* cp = new QgsCurvePolygonV2();
  cp->setExteriorRing( cc );
  mCenterPointRubberBand->setGeometry( cp );
  mCenterPointRubberBand->show();
}