qgsmapcanvasannotationitem.cpp

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/***************************************************************************
                              qgsmapcanvasannotationitem.cpp
                              ------------------------------
  begin                : January 2017
  copyright            : (C) 2017 by Nyall Dawson
  email                : nyall dot dawson at gmail dot com
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgsmapcanvasannotationitem.h"
#include "qgsannotation.h"
#include "qgsmapcanvas.h"
#include "qgsmaptool.h"
#include "qgsvectorlayer.h"
#include "qgsfeatureiterator.h"
#include "qgsexception.h"
#include "qgssymbollayerutils.h"
#include "qgsproject.h"
#include "qgsannotationmanager.h"
#include "qgsfillsymbol.h"
#include "qgsmarkersymbol.h"
 
#include <QPainter>
 
 
QgsMapCanvasAnnotationItem::QgsMapCanvasAnnotationItem( QgsAnnotation *annotation, QgsMapCanvas *mapCanvas )
  : QgsMapCanvasItem( mapCanvas )
  , mAnnotation( annotation )
{
  setFlag( QGraphicsItem::ItemIsSelectable, true );
  if ( mapCanvas && !mapCanvas->annotationsVisible() )
    setVisible( false );
 
  connect( mAnnotation, &QgsAnnotation::appearanceChanged, this, [this] { update(); } );
  connect( mAnnotation, &QgsAnnotation::moved, this, [this] { updatePosition(); } );
  connect( mAnnotation, &QgsAnnotation::moved, this, &QgsMapCanvasAnnotationItem::setFeatureForMapPosition );
  connect( mMapCanvas, &QgsMapCanvas::destinationCrsChanged, this, [ = ] { updatePosition(); } );
 
  connect( mAnnotation, &QgsAnnotation::appearanceChanged, this, &QgsMapCanvasAnnotationItem::updateBoundingRect );
 
  connect( mMapCanvas, &QgsMapCanvas::layersChanged, this, &QgsMapCanvasAnnotationItem::onCanvasLayersChanged );
  connect( mAnnotation, &QgsAnnotation::mapLayerChanged, this, &QgsMapCanvasAnnotationItem::onCanvasLayersChanged );
 
  //lifetime is tied to annotation!
  connect( mAnnotation, &QgsAnnotation::destroyed, this, &QgsMapCanvasAnnotationItem::annotationDeleted );
 
  updatePosition();
  setFeatureForMapPosition();
}
 
void QgsMapCanvasAnnotationItem::updatePosition()
{
  if ( !mAnnotation )
    return;
 
  if ( mAnnotation->hasFixedMapPosition() )
  {
    const QgsCoordinateTransform t( mAnnotation->mapPositionCrs(), mMapCanvas->mapSettings().destinationCrs(), QgsProject::instance() );
    QgsPointXY coord = mAnnotation->mapPosition();
    try
    {
      coord = t.transform( coord );
    }
    catch ( QgsCsException & )
    {}
    setPos( toCanvasCoordinates( coord ) );
  }
  else
  {
    //relative position
 
    const double x = mAnnotation->relativePosition().x() * mMapCanvas->width();
    const double y = mAnnotation->relativePosition().y() * mMapCanvas->height();
    setPos( x, y );
  }
  updateBoundingRect();
}
 
QRectF QgsMapCanvasAnnotationItem::boundingRect() const
{
  return mBoundingRect;
}
 
void QgsMapCanvasAnnotationItem::updateBoundingRect()
{
  prepareGeometryChange();
 
  const QgsRenderContext rc = QgsRenderContext::fromQPainter( nullptr );
  const double fillSymbolBleed = mAnnotation && mAnnotation->fillSymbol() ?
                                 QgsSymbolLayerUtils::estimateMaxSymbolBleed( mAnnotation->fillSymbol(), rc ) : 0;
 
  const double mmToPixelScale = mMapCanvas->physicalDpiX() / 25.4;
 
  if ( mAnnotation && !mAnnotation->hasFixedMapPosition() )
  {
    mBoundingRect = QRectF( - fillSymbolBleed, -fillSymbolBleed,
                            mmToPixelScale * mAnnotation->frameSizeMm().width() + fillSymbolBleed * 2,
                            mmToPixelScale * mAnnotation->frameSizeMm().height() + fillSymbolBleed * 2 );
  }
  else
  {
    double halfSymbolSize = 0.0;
    if ( mAnnotation && mAnnotation->markerSymbol() )
    {
      halfSymbolSize = scaledSymbolSize() / 2.0;
    }
 
    const QPointF offset = mAnnotation ? QPointF( mAnnotation->frameOffsetFromReferencePointMm().x() * mmToPixelScale,
                           mAnnotation->frameOffsetFromReferencePointMm().y() * mmToPixelScale ) : QPointF( 0, 0 );
 
    const QSizeF frameSize = mAnnotation ? QSizeF( mAnnotation->frameSizeMm().width() * mmToPixelScale,
                             mAnnotation->frameSizeMm().height() * mmToPixelScale ) : QSizeF( 0.0, 0.0 );
 
    const double xMinPos = std::min( -halfSymbolSize, offset.x() - fillSymbolBleed );
    const double xMaxPos = std::max( halfSymbolSize, offset.x() + frameSize.width() + fillSymbolBleed );
    const double yMinPos = std::min( -halfSymbolSize, offset.y() - fillSymbolBleed );
    const double yMaxPos = std::max( halfSymbolSize, offset.y() + frameSize.height() + fillSymbolBleed );
    mBoundingRect = QRectF( xMinPos, yMinPos, xMaxPos - xMinPos, yMaxPos - yMinPos );
  }
}
 
void QgsMapCanvasAnnotationItem::onCanvasLayersChanged()
{
  if ( !mAnnotation )
    return;
  if ( !mMapCanvas->annotationsVisible() )
  {
    setVisible( false );
  }
  else if ( !mAnnotation->mapLayer() )
  {
    setVisible( true );
  }
  else
  {
    setVisible( mMapCanvas->mapSettings().layers( true ).contains( mAnnotation->mapLayer() ) );
  }
}
 
void QgsMapCanvasAnnotationItem::setFeatureForMapPosition()
{
  if ( !mAnnotation || !mAnnotation->hasFixedMapPosition() )
    return;
 
  QgsVectorLayer *vectorLayer = qobject_cast< QgsVectorLayer * >( mAnnotation->mapLayer() );
  if ( !vectorLayer )
    return;
 
  const double halfIdentifyWidth = QgsMapTool::searchRadiusMU( mMapCanvas );
  QgsPointXY mapPosition = mAnnotation->mapPosition();
 
  try
  {
    const QgsCoordinateTransform ct( mAnnotation->mapPositionCrs(), mMapCanvas->mapSettings().destinationCrs(), QgsProject::instance() );
    if ( ct.isValid() )
      mapPosition = ct.transform( mapPosition );
  }
  catch ( QgsCsException & )
  {
  }
 
  QgsRectangle searchRect( mapPosition.x() - halfIdentifyWidth, mapPosition.y() - halfIdentifyWidth,
                           mapPosition.x() + halfIdentifyWidth, mapPosition.y() + halfIdentifyWidth );
 
  searchRect = mMapCanvas->mapSettings().mapToLayerCoordinates( vectorLayer, searchRect );
 
  QgsFeatureIterator fit = vectorLayer->getFeatures( QgsFeatureRequest().setFilterRect( searchRect ).setFlags( Qgis::FeatureRequestFlag::ExactIntersect ).setLimit( 1 ) );
 
  QgsFeature currentFeature;
  ( void )fit.nextFeature( currentFeature );
  mAnnotation->setAssociatedFeature( currentFeature );
}
 
void QgsMapCanvasAnnotationItem::annotationDeleted()
{
  mAnnotation = nullptr;
  deleteLater();
}
 
void QgsMapCanvasAnnotationItem::drawSelectionBoxes( QPainter *p ) const
{
  if ( !p )
  {
    return;
  }
 
  const double handlerSize = 10;
  p->setPen( Qt::NoPen );
  p->setBrush( QColor( 200, 200, 210, 120 ) );
  p->drawRect( QRectF( mBoundingRect.left(), mBoundingRect.top(), handlerSize, handlerSize ) );
  p->drawRect( QRectF( mBoundingRect.right() - handlerSize, mBoundingRect.top(), handlerSize, handlerSize ) );
  p->drawRect( QRectF( mBoundingRect.right() - handlerSize, mBoundingRect.bottom() - handlerSize, handlerSize, handlerSize ) );
  p->drawRect( QRectF( mBoundingRect.left(), mBoundingRect.bottom() - handlerSize, handlerSize, handlerSize ) );
}
 
QgsMapCanvasAnnotationItem::MouseMoveAction QgsMapCanvasAnnotationItem::moveActionForPosition( QPointF pos ) const
{
  const QPointF itemPos = mapFromScene( pos );
 
  const int cursorSensitivity = 7;
 
  if ( mAnnotation && mAnnotation->hasFixedMapPosition() &&
       std::fabs( itemPos.x() ) < cursorSensitivity && std::fabs( itemPos.y() ) < cursorSensitivity ) //move map point if position is close to the origin
  {
    return MoveMapPosition;
  }
 
  const double mmToPixelScale = mMapCanvas->logicalDpiX() / 25.4;
 
  const QPointF offset = mAnnotation && mAnnotation->hasFixedMapPosition() ? mAnnotation->frameOffsetFromReferencePointMm() * mmToPixelScale : QPointF( 0, 0 );
  const QSizeF frameSize = mAnnotation ? mAnnotation->frameSizeMm() * mmToPixelScale : QSizeF( 0, 0 );
 
  bool left, right, up, down, inframe;
  left = std::fabs( itemPos.x() - offset.x() ) < cursorSensitivity;
  right = std::fabs( itemPos.x() - ( offset.x() + frameSize.width() ) ) < cursorSensitivity;
  up = std::fabs( itemPos.y() - offset.y() ) < cursorSensitivity;
  down = std::fabs( itemPos.y() - ( offset.y() + frameSize.height() ) ) < cursorSensitivity;
  inframe = (
              itemPos.x() + cursorSensitivity >= offset.x() &&
              itemPos.x() - cursorSensitivity <= ( offset.x() + frameSize.width() ) &&
              itemPos.y() + cursorSensitivity >= offset.y() &&
              itemPos.y() - cursorSensitivity <= ( offset.y() + frameSize.height() ) );
 
  // Resize actions are only available if the item is selected
  // Otherwise, mouse handles are not visible
  if ( isSelected() )
  {
    if ( left && up )
    {
      return ResizeFrameLeftUp;
    }
    else if ( right && up )
    {
      return ResizeFrameRightUp;
    }
    else if ( left && down )
    {
      return ResizeFrameLeftDown;
    }
    else if ( right && down )
    {
      return ResizeFrameRightDown;
    }
    if ( left && inframe )
    {
      return ResizeFrameLeft;
    }
    if ( right && inframe )
    {
      return ResizeFrameRight;
    }
    if ( up && inframe )
    {
      return ResizeFrameUp;
    }
    if ( down && inframe )
    {
      return ResizeFrameDown;
    }
  }
 
  //finally test if pos is in the frame area
  if ( inframe )
  {
    return MoveFramePosition;
  }
  return NoAction;
}
 
Qt::CursorShape QgsMapCanvasAnnotationItem::cursorShapeForAction( MouseMoveAction moveAction ) const
{
  switch ( moveAction )
  {
    case NoAction:
      return Qt::ArrowCursor;
    case MoveMapPosition:
    case MoveFramePosition:
      return Qt::SizeAllCursor;
    case ResizeFrameUp:
    case ResizeFrameDown:
      return Qt::SizeVerCursor;
    case ResizeFrameLeft:
    case ResizeFrameRight:
      return Qt::SizeHorCursor;
    case ResizeFrameLeftUp:
    case ResizeFrameRightDown:
      return Qt::SizeFDiagCursor;
    case ResizeFrameRightUp:
    case ResizeFrameLeftDown:
      return Qt::SizeBDiagCursor;
    default:
      return Qt::ArrowCursor;
  }
}
 
double QgsMapCanvasAnnotationItem::scaledSymbolSize() const
{
  if ( !mAnnotation || !mAnnotation->markerSymbol() )
  {
    return 0.0;
  }
 
  if ( !mMapCanvas )
  {
    return mAnnotation->markerSymbol()->size();
  }
 
  const double dpmm = mMapCanvas->logicalDpiX() / 25.4;
  return dpmm * mAnnotation->markerSymbol()->size();
}
 
void QgsMapCanvasAnnotationItem::paint( QPainter *painter )
{
  if ( !mAnnotation || !mAnnotation->isVisible() )
    return;
 
  QgsRenderContext rc = QgsRenderContext::fromQPainter( painter );
  rc.setFlag( Qgis::RenderContextFlag::Antialiasing, true );
 
  if ( mAnnotation )
    mAnnotation->render( rc );
 
  if ( isSelected() )
  {
    drawSelectionBoxes( painter );
  }
}