drawinglayer/source/primitive2d/cropprimitive2d.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
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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
  28
  29 using namespace com::sun::star;
  30
  31
  32 namespace drawinglayer::primitive2d
  33 {
  34         CropPrimitive2D::CropPrimitive2D(
  35             const Primitive2DContainer& rChildren,
  36             const basegfx::B2DHomMatrix& rTransformation,
  37             double fCropLeft,
  38             double fCropTop,
  39             double fCropRight,
  40             double fCropBottom)
  41         :   GroupPrimitive2D(rChildren),
  42             maTransformation(rTransformation),
  43             mfCropLeft(fCropLeft),
  44             mfCropTop(fCropTop),
  45             mfCropRight(fCropRight),
  46             mfCropBottom(fCropBottom)
  47         {
  48         }
  49
  50         bool CropPrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const
  51         {
  52             if(GroupPrimitive2D::operator==(rPrimitive))
  53             {
  54                 const CropPrimitive2D& rCompare = static_cast< const CropPrimitive2D& >(rPrimitive);
  55
  56                 return (getTransformation() == rCompare.getTransformation()
  57                     && getCropLeft() == rCompare.getCropLeft()
  58                     && getCropTop() == rCompare.getCropTop()
  59                     && getCropRight() == rCompare.getCropRight()
  60                     && getCropBottom() == rCompare.getCropBottom());
  61             }
  62
  63             return false;
  64         }
  65
  66         void CropPrimitive2D::get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor, const geometry::ViewInformation2D& /*rViewInformation*/) const
  67         {
  68             if(getChildren().empty())
  69                 return;
  70
  71             // get original object scale in unit coordinates (no mirroring)
  72             const basegfx::B2DVector aObjectScale(basegfx::absolute(getTransformation() * basegfx::B2DVector(1.0, 1.0)));
  73
  74             // we handle cropping, so when no width or no height, content will be empty,
  75             // so only do something when we have a width and a height
  76             if(aObjectScale.equalZero())
  77                 return;
  78
  79             // calculate crop distances in unit coordinates. They are already combined with CropScaleFactor, thus
  80             // are relative only to object scale
  81             const double fBackScaleX(basegfx::fTools::equalZero(aObjectScale.getX()) ? 1.0 : 1.0 / fabs(aObjectScale.getX()));
  82             const double fBackScaleY(basegfx::fTools::equalZero(aObjectScale.getY()) ? 1.0 : 1.0 / fabs(aObjectScale.getY()));
  83             const double fLeft(getCropLeft() * fBackScaleX);
  84             const double fTop(getCropTop() * fBackScaleY);
  85             const double fRight(getCropRight() * fBackScaleX);
  86             const double fBottom(getCropBottom() * fBackScaleY);
  87
  88             // calc new unit range for comparisons; the original range is the unit range
  89             const basegfx::B2DRange aUnitRange(0.0, 0.0, 1.0, 1.0);
  90             const basegfx::B2DRange aNewRange(
  91                 -fLeft,
  92                 -fTop,
  93                 1.0 + fRight,
  94                 1.0 + fBottom);
  95
  96             // if we have no overlap the crop has removed everything, so we do only
  97             // have to create content if this is not the case
  98             if(!aNewRange.overlaps(aUnitRange))
  99                 return;
 100
 101             // create new transform; first take out old transform to get
 102             // to unit coordinates by inverting. Inverting should be flawless
 103             // since we already checked that object size is not zero in X or Y
 104             basegfx::B2DHomMatrix aNewTransform(getTransformation());
 105
 106             aNewTransform.invert();
 107
 108             // apply crop enlargement in unit coordinates
 109             aNewTransform = basegfx::utils::createScaleTranslateB2DHomMatrix(
 110                 aNewRange.getRange(),
 111                 aNewRange.getMinimum()) * aNewTransform;
 112
 113             // apply original transformation. Since we have manipulated the crop
 114             // in unit coordinates we do not need to care about mirroring or
 115             // a corrected point for a possible shear or rotation, this all comes for
 116             // free
 117             aNewTransform = getTransformation() * aNewTransform;
 118
 119             // prepare TransformPrimitive2D with xPrimitive
 120             const Primitive2DReference xTransformPrimitive(
 121                 new TransformPrimitive2D(
 122                     aNewTransform,
 123                     getChildren()));
 124
 125             if(aUnitRange.isInside(aNewRange))
 126             {
 127                 // the new range is completely inside the old range (unit range),
 128                 // so no masking is needed
 129                 rVisitor.append(xTransformPrimitive);
 130             }
 131             else
 132             {
 133                 // mask with original object's bounds
 134                 basegfx::B2DPolyPolygon aMaskPolyPolygon(basegfx::utils::createUnitPolygon());
 135                 aMaskPolyPolygon.transform(getTransformation());
 136
 137                 // create maskPrimitive with aMaskPolyPolygon and aMaskContentVector
 138                 const Primitive2DReference xMask(
 139                     new MaskPrimitive2D(
 140                         aMaskPolyPolygon,
 141                         Primitive2DContainer { xTransformPrimitive }));
 142
 143                 rVisitor.append(xMask);
 144             }
 145         }
 146
 147         // provide unique ID
 148         ImplPrimitive2DIDBlock(CropPrimitive2D, PRIMITIVE2D_ID_CROPPRIMITIVE2D)
 149
 150 } // end of namespace
 151
 152 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */