chart2/source/view/main/PolarLabelPositionHelper.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <BaseGFXHelper.hxx>
  21 #include <PolarLabelPositionHelper.hxx>
  22 #include <PlottingPositionHelper.hxx>
  23 #include <basegfx/vector/b2dvector.hxx>
  24 #include <basegfx/vector/b2ivector.hxx>
  25
  26 #include <com/sun/star/chart/DataLabelPlacement.hpp>
  27
  28 namespace chart
  29 {
  30 using namespace ::com::sun::star;
  31
  32 PolarLabelPositionHelper::PolarLabelPositionHelper(
  33                     PolarPlottingPositionHelper* pPosHelper
  34                     , sal_Int32 nDimensionCount
  35                     , const rtl::Reference<SvxShapeGroupAnyD>& xLogicTarget )
  36                     : LabelPositionHelper( nDimensionCount, xLogicTarget )
  37                     , m_pPosHelper(pPosHelper)
  38 {
  39 }
  40
  41 PolarLabelPositionHelper::~PolarLabelPositionHelper()
  42 {
  43 }
  44
  45 awt::Point PolarLabelPositionHelper::getLabelScreenPositionAndAlignmentForLogicValues(
  46         LabelAlignment& rAlignment
  47         , double fLogicValueOnAngleAxis
  48         , double fLogicValueOnRadiusAxis
  49         , double fLogicZ
  50         , sal_Int32 nScreenValueOffsetInRadiusDirection ) const
  51 {
  52     double fUnitCircleAngleDegree = m_pPosHelper->transformToAngleDegree( fLogicValueOnAngleAxis );
  53     double fUnitCircleRadius = m_pPosHelper->transformToRadius( fLogicValueOnRadiusAxis );
  54
  55     return getLabelScreenPositionAndAlignmentForUnitCircleValues(
  56            rAlignment, css::chart::DataLabelPlacement::OUTSIDE
  57            , fUnitCircleAngleDegree, 0.0
  58            , fUnitCircleRadius, fUnitCircleRadius, fLogicZ, nScreenValueOffsetInRadiusDirection );
  59 }
  60
  61 awt::Point PolarLabelPositionHelper::getLabelScreenPositionAndAlignmentForUnitCircleValues(
  62         LabelAlignment& rAlignment, sal_Int32 nLabelPlacement
  63         , double fUnitCircleStartAngleDegree, double fUnitCircleWidthAngleDegree
  64         , double fUnitCircleInnerRadius, double fUnitCircleOuterRadius
  65         , double fLogicZ
  66         , sal_Int32 nScreenValueOffsetInRadiusDirection
  67         , const ::basegfx::B3DVector& aOffset) const
  68 {
  69     bool bCenter = (nLabelPlacement != css::chart::DataLabelPlacement::OUTSIDE)
  70                 && (nLabelPlacement != css::chart::DataLabelPlacement::INSIDE);
  71
  72     double fAngleDegree = fUnitCircleStartAngleDegree + fUnitCircleWidthAngleDegree/2.0;
  73     double fRadius = 0.0;
  74     if( !bCenter ) //e.g. for pure pie chart(one ring only) or for angle axis of polar coordinate system
  75         fRadius = fUnitCircleOuterRadius;
  76     else
  77         fRadius = fUnitCircleInnerRadius + (fUnitCircleOuterRadius-fUnitCircleInnerRadius)/2.0 ;
  78
  79     awt::Point aRet( transformSceneToScreenPosition(
  80         m_pPosHelper->transformUnitCircleToScene( fAngleDegree, fRadius,
  81             fLogicZ+0.5, aOffset ) ) );
  82
  83     if(m_nDimensionCount==3 && nLabelPlacement == css::chart::DataLabelPlacement::OUTSIDE)
  84     {
  85         //check whether the upper or the downer edge is more distant from the center
  86         //take the farthest point to put the label to
  87
  88         awt::Point aP0( transformSceneToScreenPosition(
  89             m_pPosHelper->transformUnitCircleToScene( 0, 0, fLogicZ, aOffset ) ) );
  90         awt::Point aP1(aRet);
  91         awt::Point aP2( transformSceneToScreenPosition(
  92             m_pPosHelper->transformUnitCircleToScene( fAngleDegree, fRadius,
  93                 fLogicZ-0.5, aOffset ) ) );
  94
  95         ::basegfx::B2DVector aV0( aP0.X, aP0.Y );
  96         ::basegfx::B2DVector aV1( aP1.X, aP1.Y );
  97         ::basegfx::B2DVector aV2( aP2.X, aP2.Y );
  98
  99         double fL1 = ::basegfx::B2DVector(aV1-aV0).getLength();
 100         double fL2 = ::basegfx::B2DVector(aV2-aV0).getLength();
 101
 102         if(fL2>fL1)
 103             aRet = aP2;
 104
 105         //calculate new angle for alignment
 106         double fDX = aRet.X-aP0.X;
 107         double fDY = aRet.Y-aP0.Y;
 108         fDY*=-1.0;//drawing layer has inverse y values
 109
 110         fAngleDegree = basegfx::rad2deg(atan2(fDY,fDX));
 111     }
 112     //set LabelAlignment
 113     if( !bCenter )
 114     {
 115         // tdf#123504: both 0 and 360 are valid and different values here!
 116         while (fAngleDegree > 360.0)
 117             fAngleDegree -= 360.0;
 118         while (fAngleDegree < 0.0)
 119             fAngleDegree += 360.0;
 120
 121         bool bOutside = nLabelPlacement == css::chart::DataLabelPlacement::OUTSIDE;
 122
 123         if (fAngleDegree <= 5 || fAngleDegree >= 355)
 124             rAlignment = bOutside ? LABEL_ALIGN_RIGHT : LABEL_ALIGN_LEFT;
 125         else if (fAngleDegree < 85)
 126             rAlignment = bOutside ? LABEL_ALIGN_RIGHT_TOP : LABEL_ALIGN_LEFT_BOTTOM;
 127         else if (fAngleDegree <= 95)
 128             rAlignment = bOutside ? LABEL_ALIGN_TOP : LABEL_ALIGN_BOTTOM;
 129         else if (fAngleDegree < 175)
 130             rAlignment = bOutside ? LABEL_ALIGN_LEFT_TOP : LABEL_ALIGN_RIGHT_BOTTOM;
 131         else if (fAngleDegree <= 185)
 132             rAlignment = bOutside ? LABEL_ALIGN_LEFT : LABEL_ALIGN_RIGHT;
 133         else if (fAngleDegree < 265)
 134             rAlignment = bOutside ? LABEL_ALIGN_LEFT_BOTTOM : LABEL_ALIGN_RIGHT_TOP;
 135         else if (fAngleDegree <= 275)
 136             rAlignment = bOutside ? LABEL_ALIGN_BOTTOM : LABEL_ALIGN_TOP;
 137         else
 138             rAlignment = bOutside ? LABEL_ALIGN_RIGHT_BOTTOM : LABEL_ALIGN_LEFT_TOP;
 139     }
 140     else
 141     {
 142         rAlignment = LABEL_ALIGN_CENTER;
 143     }
 144
 145     //add a scaling independent Offset if requested
 146     if( nScreenValueOffsetInRadiusDirection != 0)
 147     {
 148         awt::Point aOrigin( transformSceneToScreenPosition(
 149             m_pPosHelper->transformUnitCircleToScene( 0.0, 0.0, fLogicZ+0.5,
 150                 aOffset ) ) );
 151         basegfx::B2IVector aDirection( aRet.X- aOrigin.X, aRet.Y- aOrigin.Y );
 152         aDirection.setLength(nScreenValueOffsetInRadiusDirection);
 153         aRet.X += aDirection.getX();
 154         aRet.Y += aDirection.getY();
 155     }
 156
 157     return aRet;
 158 }
 159
 160 } //namespace chart
 161
 162 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */