text: /**************************************************************
   * 
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   * 
   *   http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   * 
   *************************************************************/
  
  
  
  // MARKER(update_precomp.py): autogen include statement, do not remove
  #include "precompiled_chart2.hxx"
  
  #include "PolarLabelPositionHelper.hxx"
  #include "PlottingPositionHelper.hxx"
  #include "CommonConverters.hxx"
  #include <basegfx/vector/b2dvector.hxx>
  #include <basegfx/vector/b2ivector.hxx>
  
  #include <com/sun/star/chart/DataLabelPlacement.hpp>
  
  //.............................................................................
  namespace chart
  {
  //.............................................................................
  using namespace ::com::sun::star;
  using namespace ::com::sun::star::chart2;
  
  PolarLabelPositionHelper::PolarLabelPositionHelper(
                      PolarPlottingPositionHelper* pPosHelper
                      , sal_Int32 nDimensionCount
                      , const uno::Reference< drawing::XShapes >& xLogicTarget
                      , ShapeFactory* pShapeFactory )
                      : LabelPositionHelper( pPosHelper, nDimensionCount, xLogicTarget, pShapeFactory )
                      , m_pPosHelper(pPosHelper)
  {
  }
  
  PolarLabelPositionHelper::~PolarLabelPositionHelper()
  {
  }
  
  awt::Point PolarLabelPositionHelper::getLabelScreenPositionAndAlignmentForLogicValues(
          LabelAlignment& rAlignment
          , double fLogicValueOnAngleAxis
          , double fLogicValueOnRadiusAxis
          , double fLogicZ
          , sal_Int32 nScreenValueOffsetInRadiusDirection ) const
  {
      double fUnitCircleAngleDegree = m_pPosHelper->transformToAngleDegree( fLogicValueOnAngleAxis );
      double fUnitCircleRadius = m_pPosHelper->transformToRadius( fLogicValueOnRadiusAxis );
      
      return getLabelScreenPositionAndAlignmentForUnitCircleValues(
             rAlignment, ::com::sun::star::chart::DataLabelPlacement::OUTSIDE
             , fUnitCircleAngleDegree, 0.0
             , fUnitCircleRadius, fUnitCircleRadius, fLogicZ, nScreenValueOffsetInRadiusDirection );
  }
  
  awt::Point PolarLabelPositionHelper::getLabelScreenPositionAndAlignmentForUnitCircleValues(
          LabelAlignment& rAlignment, sal_Int32 nLabelPlacement
          , double fUnitCircleStartAngleDegree, double fUnitCircleWidthAngleDegree
          , double fUnitCircleInnerRadius, double fUnitCircleOuterRadius
          , double fLogicZ
          , sal_Int32 nScreenValueOffsetInRadiusDirection ) const
  {
      bool bCenter = (nLabelPlacement != ::com::sun::star::chart::DataLabelPlacement::OUTSIDE)
                  && (nLabelPlacement != ::com::sun::star::chart::DataLabelPlacement::INSIDE);
      
      double fAngleDegree = fUnitCircleStartAngleDegree + fUnitCircleWidthAngleDegree/2.0;
      double fRadius = 0.0;
      if( !bCenter ) //e.g. for pure pie chart(one ring only) or for angle axis of polyar coordinate system
          fRadius = fUnitCircleOuterRadius;
      else
          fRadius = fUnitCircleInnerRadius + (fUnitCircleOuterRadius-fUnitCircleInnerRadius)/2.0 ;
  
      awt::Point aRet( this->transformSceneToScreenPosition(
          m_pPosHelper->transformUnitCircleToScene( fAngleDegree, fRadius, fLogicZ+0.5 ) ) );
      
      if(3==m_nDimensionCount && nLabelPlacement == ::com::sun::star::chart::DataLabelPlacement::OUTSIDE)
      {
          //check whether the upper or the downer edge is more distant from the center
          //take the farest point to put the label to
  
          awt::Point aP0( this->transformSceneToScreenPosition(
              m_pPosHelper->transformUnitCircleToScene( 0, 0, fLogicZ ) ) );
          awt::Point aP1(aRet);
          awt::Point aP2( this->transformSceneToScreenPosition(
              m_pPosHelper->transformUnitCircleToScene( fAngleDegree, fRadius, fLogicZ-0.5 ) ) );
  
          ::basegfx::B2DVector aV0( aP0.X, aP0.Y );
          ::basegfx::B2DVector aV1( aP1.X, aP1.Y );
          ::basegfx::B2DVector aV2( aP2.X, aP2.Y );
  
          double fL1 = ::basegfx::B2DVector(aV1-aV0).getLength();
          double fL2 = ::basegfx::B2DVector(aV2-aV0).getLength();
  
          if(fL2>fL1)
              aRet = aP2;
  
          //calculate new angle for alignment
          double fDX = aRet.X-aP0.X;
          double fDY = aRet.Y-aP0.Y;
          fDY*=-1.0;//drawing layer has inverse y values
          if( fDX != 0.0 )
          {
              fAngleDegree = atan(fDY/fDX)*180.0/F_PI;
              if(fDX<0.0)
                  fAngleDegree+=180.0;
          }
          else
          {
              if(fDY>0.0)
                  fAngleDegree = 90.0;
              else
                  fAngleDegree = 270.0;
          }
      }
      //------------------------------
      //set LabelAlignment
      if( !bCenter )
      {
          while(fAngleDegree>360.0)
              fAngleDegree-=360.0;
          while(fAngleDegree<0.0)
              fAngleDegree+=360.0;
  
          bool bOutside = nLabelPlacement == ::com::sun::star::chart::DataLabelPlacement::OUTSIDE;
  
          if(fAngleDegree==0.0)
              rAlignment = LABEL_ALIGN_CENTER;
          else if(fAngleDegree<=22.5)
              rAlignment = bOutside ? LABEL_ALIGN_RIGHT : LABEL_ALIGN_LEFT;
          else if(fAngleDegree<67.5)
              rAlignment = bOutside ? LABEL_ALIGN_RIGHT_TOP : LABEL_ALIGN_LEFT_BOTTOM;
          else if(fAngleDegree<112.5)
              rAlignment = bOutside ? LABEL_ALIGN_TOP : LABEL_ALIGN_BOTTOM;
          else if(fAngleDegree<=157.5)
              rAlignment = bOutside ? LABEL_ALIGN_LEFT_TOP : LABEL_ALIGN_RIGHT_BOTTOM;
          else if(fAngleDegree<=202.5)
              rAlignment = bOutside ? LABEL_ALIGN_LEFT : LABEL_ALIGN_RIGHT;
          else if(fAngleDegree<247.5)
              rAlignment = bOutside ? LABEL_ALIGN_LEFT_BOTTOM : LABEL_ALIGN_RIGHT_TOP;
          else if(fAngleDegree<292.5)
              rAlignment = bOutside ? LABEL_ALIGN_BOTTOM : LABEL_ALIGN_TOP;
          else if(fAngleDegree<337.5)
              rAlignment = bOutside ? LABEL_ALIGN_RIGHT_BOTTOM : LABEL_ALIGN_LEFT_TOP;
          else
              rAlignment = bOutside ? LABEL_ALIGN_RIGHT : LABEL_ALIGN_LEFT;
      }
      else
      {
          rAlignment = LABEL_ALIGN_CENTER;
      }
  
      //add a scaling independent Offset if requested
      if( nScreenValueOffsetInRadiusDirection != 0)
      {
          awt::Point aOrigin( this->transformSceneToScreenPosition(
              m_pPosHelper->transformUnitCircleToScene( 0.0, 0.0, fLogicZ+0.5 ) ) );
          basegfx::B2IVector aDirection( aRet.X- aOrigin.X, aRet.Y- aOrigin.Y );
          aDirection.setLength(nScreenValueOffsetInRadiusDirection);
          aRet.X += aDirection.getX();
          aRet.Y += aDirection.getY();
      }
  
      return aRet;
  }
  
  //.............................................................................
  } //namespace chart
  //.............................................................................
  