drawinglayer/source/primitive2d/cropprimitive2d.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  19
  20 #include <primitive2d/cropprimitive2d.hxx>
  21 #include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>
  22 #include <basegfx/matrix/b2dhommatrix.hxx>
  23 #include <basegfx/matrix/b2dhommatrixtools.hxx>
  24 #include <drawinglayer/primitive2d/transformprimitive2d.hxx>
  25 #include <basegfx/polygon/b2dpolygontools.hxx>
  26 #include <drawinglayer/primitive2d/maskprimitive2d.hxx>
  27 #include <utility>
  28
  29
  30 using namespace com::sun::star;
  31
  32
  33 namespace drawinglayer::primitive2d
  34 {
  35         CropPrimitive2D::CropPrimitive2D(
  36             Primitive2DContainer&& aChildren,
  37             basegfx::B2DHomMatrix aTransformation,
  38             double fCropLeft,
  39             double fCropTop,
  40             double fCropRight,
  41             double fCropBottom)
  42         :   GroupPrimitive2D(std::move(aChildren)),
  43             maTransformation(std::move(aTransformation)),
  44             mfCropLeft(fCropLeft),
  45             mfCropTop(fCropTop),
  46             mfCropRight(fCropRight),
  47             mfCropBottom(fCropBottom)
  48         {
  49         }
  50
  51         bool CropPrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const
  52         {
  53             if(GroupPrimitive2D::operator==(rPrimitive))
  54             {
  55                 const CropPrimitive2D& rCompare = static_cast< const CropPrimitive2D& >(rPrimitive);
  56
  57                 return (getTransformation() == rCompare.getTransformation()
  58                     && getCropLeft() == rCompare.getCropLeft()
  59                     && getCropTop() == rCompare.getCropTop()
  60                     && getCropRight() == rCompare.getCropRight()
  61                     && getCropBottom() == rCompare.getCropBottom());
  62             }
  63
  64             return false;
  65         }
  66
  67         void CropPrimitive2D::get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor, const geometry::ViewInformation2D& /*rViewInformation*/) const
  68         {
  69             if(getChildren().empty())
  70                 return;
  71
  72             // get original object scale in unit coordinates (no mirroring)
  73             const basegfx::B2DVector aObjectScale(basegfx::absolute(getTransformation() * basegfx::B2DVector(1.0, 1.0)));
  74
  75             // we handle cropping, so when no width or no height, content will be empty,
  76             // so only do something when we have a width and a height
  77             if(aObjectScale.equalZero())
  78                 return;
  79
  80             // calculate crop distances in unit coordinates. They are already combined with CropScaleFactor, thus
  81             // are relative only to object scale
  82             const double fBackScaleX(basegfx::fTools::equalZero(aObjectScale.getX()) ? 1.0 : 1.0 / fabs(aObjectScale.getX()));
  83             const double fBackScaleY(basegfx::fTools::equalZero(aObjectScale.getY()) ? 1.0 : 1.0 / fabs(aObjectScale.getY()));
  84             const double fLeft(getCropLeft() * fBackScaleX);
  85             const double fTop(getCropTop() * fBackScaleY);
  86             const double fRight(getCropRight() * fBackScaleX);
  87             const double fBottom(getCropBottom() * fBackScaleY);
  88
  89             // calc new unit range for comparisons; the original range is the unit range
  90             const basegfx::B2DRange aUnitRange(0.0, 0.0, 1.0, 1.0);
  91             const basegfx::B2DRange aNewRange(
  92                 -fLeft,
  93                 -fTop,
  94                 1.0 + fRight,
  95                 1.0 + fBottom);
  96
  97             // if we have no overlap the crop has removed everything, so we do only
  98             // have to create content if this is not the case
  99             if(!aNewRange.overlaps(aUnitRange))
 100                 return;
 101
 102             // create new transform; first take out old transform to get
 103             // to unit coordinates by inverting. Inverting should be flawless
 104             // since we already checked that object size is not zero in X or Y
 105             basegfx::B2DHomMatrix aNewTransform(getTransformation());
 106
 107             aNewTransform.invert();
 108
 109             // apply crop enlargement in unit coordinates
 110             aNewTransform = basegfx::utils::createScaleTranslateB2DHomMatrix(
 111                 aNewRange.getRange(),
 112                 aNewRange.getMinimum()) * aNewTransform;
 113
 114             // apply original transformation. Since we have manipulated the crop
 115             // in unit coordinates we do not need to care about mirroring or
 116             // a corrected point for a possible shear or rotation, this all comes for
 117             // free
 118             aNewTransform = getTransformation() * aNewTransform;
 119
 120             // prepare TransformPrimitive2D with xPrimitive
 121             const Primitive2DReference xTransformPrimitive(
 122                 new TransformPrimitive2D(
 123                     aNewTransform,
 124                     Primitive2DContainer(getChildren())));
 125
 126             if(aUnitRange.isInside(aNewRange))
 127             {
 128                 // the new range is completely inside the old range (unit range),
 129                 // so no masking is needed
 130                 rVisitor.visit(xTransformPrimitive);
 131             }
 132             else
 133             {
 134                 // mask with original object's bounds
 135                 basegfx::B2DPolyPolygon aMaskPolyPolygon(basegfx::utils::createUnitPolygon());
 136                 aMaskPolyPolygon.transform(getTransformation());
 137
 138                 // create maskPrimitive with aMaskPolyPolygon and aMaskContentVector
 139                 const Primitive2DReference xMask(
 140                     new MaskPrimitive2D(
 141                         std::move(aMaskPolyPolygon),
 142                         Primitive2DContainer { xTransformPrimitive }));
 143
 144                 rVisitor.visit(xMask);
 145             }
 146         }
 147
 148         // provide unique ID
 149         sal_uInt32 CropPrimitive2D::getPrimitive2DID() const
 150         {
 151             return PRIMITIVE2D_ID_CROPPRIMITIVE2D;
 152         }
 153
 154 } // end of namespace
 155
 156 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */