make annotations aware of crs (fixes #3618)

python/gui/qgsannotationitem.sip

@@ -44,6 +44,12 @@ class QgsAnnotationItem: QgsMapCanvasItem
     virtual void setMapPosition( const QgsPoint& pos );
     QgsPoint mapPosition() const;
 
+    /** Sets the CRS of the map position.
+      @param crs the CRS to set */
+    virtual void setMapPositionCrs( const QgsCoordinateReferenceSystem& crs );
+    /** Returns the CRS of the map position.*/
+    QgsCoordinateReferenceSystem mapPositionCrs() const;
+
     void setFrameSize( const QSizeF& size );
     QSizeF frameSize() const;
 

src/app/qgisapp.cpp

@@ -2316,6 +2316,9 @@ void QgisApp::setupConnections()
   connect( mRenderSuppressionCBox, SIGNAL( toggled( bool ) ),
            mMapCanvas, SLOT( setRenderFlag( bool ) ) );
 
+  connect( mMapCanvas, SIGNAL( destinationCrsChanged() ),
+           this, SLOT( reprojectAnnotations() ) );
+
   // connect MapCanvas keyPress event so we can check if selected feature collection must be deleted
   connect( mMapCanvas, SIGNAL( keyPressed( QKeyEvent * ) ),
            this, SLOT( mapCanvas_keyPressed( QKeyEvent * ) ) );
@@ -5161,6 +5164,14 @@ void QgisApp::modifyAnnotation()
   mMapCanvas->setMapTool( mMapTools.mAnnotation );
 }
 
+void QgisApp::reprojectAnnotations()
+{
+  Q_FOREACH ( QgsAnnotationItem * annotation, annotationItems() )
+  {
+    annotation->updatePosition();
+  }
+}
+
 void QgisApp::labelingFontNotFound( QgsVectorLayer* vlayer, const QString& fontfamily )
 {
   // TODO: update when pref for how to resolve missing family (use matching algorithm or just default font) is implemented

src/app/qgisapp.h

@@ -1128,6 +1128,7 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
     void addHtmlAnnotation();
     void addSvgAnnotation();
     void modifyAnnotation();
+    void reprojectAnnotations();
 
     /** Alerts user when labeling font for layer has not been found on system */
     void labelingFontNotFound( QgsVectorLayer *vlayer, const QString& fontfamily );

src/gui/qgsannotationitem.cpp

@@ -26,6 +26,7 @@
 QgsAnnotationItem::QgsAnnotationItem( QgsMapCanvas* mapCanvas )
     : QgsMapCanvasItem( mapCanvas )
     , mMapPositionFixed( true )
+    , mMapPositionCrs( QgsCoordinateReferenceSystem() )
     , mOffsetFromReferencePoint( QPointF( 50, -50 ) )
     , mBalloonSegment( -1 )
 {
@@ -53,6 +54,12 @@ void QgsAnnotationItem::setMapPosition( const QgsPoint& pos )
 {
   mMapPosition = pos;
   setPos( toCanvasCoordinates( mMapPosition ) );
+  mMapPositionCrs = mMapCanvas->mapSettings().destinationCrs();
+}
+
+void QgsAnnotationItem::setMapPositionCrs( const QgsCoordinateReferenceSystem& crs )
+{
+  mMapPositionCrs = crs;
 }
 
 void QgsAnnotationItem::setOffsetFromReferencePoint( const QPointF& offset )
@@ -85,7 +92,8 @@ void QgsAnnotationItem::updatePosition()
 {
   if ( mMapPositionFixed )
   {
-    setPos( toCanvasCoordinates( mMapPosition ) );
+    QgsCoordinateTransform t( mMapPositionCrs, mMapCanvas->mapSettings().destinationCrs() );
+    setPos( toCanvasCoordinates( t.transform( mMapPosition ) ) );
   }
   else
   {
@@ -392,6 +400,8 @@ void QgsAnnotationItem::_writeXML( QDomDocument& doc, QDomElement& itemElem ) co
   annotationElem.setAttribute( "mapPositionFixed", mMapPositionFixed );
   annotationElem.setAttribute( "mapPosX", qgsDoubleToString( mMapPosition.x() ) );
   annotationElem.setAttribute( "mapPosY", qgsDoubleToString( mMapPosition.y() ) );
+  if ( mMapPositionCrs.isValid() )
+    mMapPositionCrs.writeXML( annotationElem, doc );
   annotationElem.setAttribute( "offsetX", qgsDoubleToString( mOffsetFromReferencePoint.x() ) );
   annotationElem.setAttribute( "offsetY", qgsDoubleToString( mOffsetFromReferencePoint.y() ) );
   annotationElem.setAttribute( "frameWidth", QString::number( mFrameSize.width() ) );
@@ -431,6 +441,8 @@ void QgsAnnotationItem::_readXML( const QDomDocument& doc, const QDomElement& an
   mapPos.setX( annotationElem.attribute( "mapPosX", "0" ).toDouble() );
   mapPos.setY( annotationElem.attribute( "mapPosY", "0" ).toDouble() );
   mMapPosition = mapPos;
+  if ( !mMapPositionCrs.readXML( annotationElem ) )
+    mMapPositionCrs = mMapCanvas->mapSettings().destinationCrs();
   mFrameBorderWidth = annotationElem.attribute( "frameBorderWidth", "0.5" ).toDouble();
   mFrameColor.setNamedColor( annotationElem.attribute( "frameColor", "#000000" ) );
   mFrameColor.setAlpha( annotationElem.attribute( "frameColorAlpha", "255" ).toInt() );

src/gui/qgsannotationitem.h

@@ -19,6 +19,7 @@
 #define QGSANNOTATIONITEM_H
 
 #include "qgsmapcanvasitem.h"
+#include "qgscoordinatereferencesystem.h"
 
 class QDomDocument;
 class QDomElement;
@@ -68,6 +69,12 @@ class GUI_EXPORT QgsAnnotationItem: public QgsMapCanvasItem
     virtual void setMapPosition( const QgsPoint& pos );
     QgsPoint mapPosition() const { return mMapPosition; }
 
+    /** Sets the CRS of the map position.
+      @param crs the CRS to set */
+    virtual void setMapPositionCrs( const QgsCoordinateReferenceSystem& crs );
+    /** Returns the CRS of the map position.*/
+    QgsCoordinateReferenceSystem mapPositionCrs() const { return mMapPositionCrs; }
+
     void setFrameSize( const QSizeF& size );
     QSizeF frameSize() const { return mFrameSize; }
 
@@ -98,6 +105,9 @@ class GUI_EXPORT QgsAnnotationItem: public QgsMapCanvasItem
     bool mMapPositionFixed;
     /** Map position (in case mMapPositionFixed is true)*/
     QgsPoint mMapPosition;
+    /** CRS of the map position */
+    QgsCoordinateReferenceSystem mMapPositionCrs;
+
     /** Describes the shift of the item content box to the reference point*/
     QPointF mOffsetFromReferencePoint;