src/ImageComposer/ImageComposer_CropOperator.cxx

   1 // Copyright (C) 2013-2022  CEA/DEN, EDF R&D, OPEN CASCADE
   2 //
   3 // This library is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU Lesser General Public
   5 // License as published by the Free Software Foundation; either
   6 // version 2.1 of the License, or (at your option) any later version.
   7 //
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // Lesser General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU Lesser General Public
  14 // License along with this library; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  16 //
  17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
  18 //
  19
  20 #include "ImageComposer_CropOperator.h"
  21 #include "ImageComposer_Image.h"
  22 #include "ImageComposer_MetaTypes.h"
  23
  24 #include <QPixmap>
  25 #include <QPainter>
  26
  27 /**
  28   Constructor
  29 */
  30 ImageComposer_CropOperator::ImageComposer_CropOperator()
  31 : ImageComposer_Operator()
  32 {
  33 }
  34
  35 /**
  36 */
  37 ImageComposer_CropOperator::~ImageComposer_CropOperator()
  38 {
  39 }
  40
  41 /**
  42 */
  43 QString ImageComposer_CropOperator::name() const
  44 {
  45   return Type();
  46 }
  47
  48 /**
  49 */
  50 QRectF ImageComposer_CropOperator::calcResultBoundingRect( const QVariant&,
  51                                                            const QVariant& theObj2 ) const
  52 {
  53   QRectF aResRect;
  54   if ( !theObj2.isNull() && theObj2.canConvert<QPainterPath>() )
  55   {
  56     QPainterPath aCropPath = theObj2.value<QPainterPath>();
  57     aResRect = aCropPath.boundingRect();
  58   }
  59   return aResRect;
  60 }
  61
  62 /**
  63 */
  64 void ImageComposer_CropOperator::drawResult( QPainter&       thePainter,
  65                                              const QVariant& theObj1,
  66                                              const QVariant& theObj2 ) const
  67 {
  68   if ( theObj1.isNull() || !theObj1.canConvert<ImageComposer_Image>() ||
  69        theObj2.isNull() || !theObj2.canConvert<QPainterPath>() )
  70     return;
  71
  72   ImageComposer_Image anImage1 = theObj1.value<ImageComposer_Image>();
  73   QPainterPath anImgClipPath = theObj2.value<QPainterPath>();
  74
  75   QRectF aBounds = anImgClipPath.boundingRect();
  76
  77   QTransform aTranslate;
  78   aTranslate.translate( -aBounds.left(), -aBounds.top() );
  79
  80   QPainterPath aClipPath = aTranslate.map( anImgClipPath );
  81   thePainter.setClipPath( aClipPath );
  82
  83   anImage1.draw( thePainter );
  84   //thePainter.fillPath( aClipPath, Qt::red );
  85 }
  86
  87 /**
  88 */
  89 ImageComposer_Image ImageComposer_CropOperator::process( const QVariant& theObj1,
  90                                                          const QVariant& theObj2 ) const
  91 {
  92   ImageComposer_Image aResult;
  93   if ( theObj1.isNull() || !theObj1.canConvert<ImageComposer_Image>() ||
  94        theObj2.isNull() || !theObj2.canConvert<QPainterPath>() )
  95     return aResult;
  96
  97   ImageComposer_Image anImage1 = theObj1.value<ImageComposer_Image>();
  98   QPainterPath aCropPath = theObj2.value<QPainterPath>();
  99
 100   QRect anImageRect( 0, 0, anImage1.width(), anImage1.height() );
 101
 102   QPainterPath anImageBoundsPath;
 103   anImageBoundsPath.addPolygon( anImage1.transform().mapToPolygon( anImageRect ) );
 104
 105   // clipping path mapped to first image's local CS
 106   QVariant anImgClipPath;
 107   anImgClipPath.setValue<QPainterPath>(
 108     anImage1.transform().inverted().map( aCropPath.intersected( anImageBoundsPath ) ) );
 109
 110   return ImageComposer_Operator::process( theObj1, anImgClipPath );
 111 }