Implement anchor point shift and expose in simple marker dialog

Author: mhugent

src/core/symbology-ng/qgsmarkersymbollayerv2.cpp

@@ -85,6 +85,15 @@ QgsSymbolLayerV2* QgsSimpleMarkerSymbolLayerV2::create( const QgsStringMap& prop
     m->setOutlineWidthUnit( QgsSymbolLayerV2Utils::decodeOutputUnit( props["outline_width_unit"] ) );
   }
 
+  if ( props.contains( "horizontal_anchor_point" ) )
+  {
+    m->setHorizontalAnchorPoint( QgsMarkerSymbolLayerV2::HorizontalAnchorPoint( props[ "horizontal_anchor_point" ].toInt() ) );
+  }
+  if ( props.contains( "vertical_anchor_point" ) )
+  {
+    m->setVerticalAnchorPoint( QgsMarkerSymbolLayerV2::VerticalAnchorPoint( props[ "vertical_anchor_point" ].toInt() ) );
+  }
+
   //data defined properties
   if ( props.contains( "name_expression" ) )
   {
@@ -546,6 +555,8 @@ QgsStringMap QgsSimpleMarkerSymbolLayerV2::properties() const
   map["scale_method"] = QgsSymbolLayerV2Utils::encodeScaleMethod( mScaleMethod );
   map["outline_width"] = QString::number( mOutlineWidth );
   map["outline_width_unit"] = QgsSymbolLayerV2Utils::encodeOutputUnit( mOutlineWidthUnit );
+  map["horizontal_anchor_point"] = QString::number( mHorizontalAnchorPoint );
+  map["vertical_anchor_point"] = QString::number( mVerticalAnchorPoint );
 
   //data define properties
   saveDataDefinedProperties( map );
@@ -560,6 +571,8 @@ QgsSymbolLayerV2* QgsSimpleMarkerSymbolLayerV2::clone() const
   m->setOffsetUnit( mOffsetUnit );
   m->setOutlineWidth( mOutlineWidth );
   m->setOutlineWidthUnit( mOutlineWidthUnit );
+  m->setHorizontalAnchorPoint( mHorizontalAnchorPoint );
+  m->setVerticalAnchorPoint( mVerticalAnchorPoint );
   copyDataDefinedProperties( m );
   return m;
 }

src/core/symbology-ng/qgssymbollayerv2.cpp

@@ -148,7 +148,8 @@ void QgsSymbolLayerV2::copyDataDefinedProperties( QgsSymbolLayerV2* destLayer )
 
 
 QgsMarkerSymbolLayerV2::QgsMarkerSymbolLayerV2( bool locked )
-    : QgsSymbolLayerV2( QgsSymbolV2::Marker, locked ), mSizeUnit( QgsSymbolV2::MM ),  mOffsetUnit( QgsSymbolV2::MM )
+    : QgsSymbolLayerV2( QgsSymbolV2::Marker, locked ), mSizeUnit( QgsSymbolV2::MM ),  mOffsetUnit( QgsSymbolV2::MM ),
+    mHorizontalAnchorPoint( HCenter ), mVerticalAnchorPoint( VCenter )
 {
 }
 
@@ -191,13 +192,31 @@ void QgsMarkerSymbolLayerV2::markerOffset( QgsSymbolV2RenderContext& context, do
   offsetX *= QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mOffsetUnit );
   offsetY *= QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mOffsetUnit );
 
-  //consider anchor point corrections
-  if( mHorizontalAnchorPoint == HCenter && mVerticalAnchorPoint == VCenter )
+  //correct horizontal position according to anchor point
+  if ( mHorizontalAnchorPoint == HCenter && mVerticalAnchorPoint == VCenter )
   {
-      return;
+    return;
   }
 
+  double anchorPointCorrection = mSize * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mSizeUnit ) / 2.0;
+  if ( mHorizontalAnchorPoint == Left )
+  {
+    offsetX += anchorPointCorrection;
+  }
+  else if ( mHorizontalAnchorPoint == Right )
+  {
+    offsetX -= anchorPointCorrection;
+  }
 
+  //correct vertical position according to anchor point
+  if ( mVerticalAnchorPoint == Top )
+  {
+    offsetY += anchorPointCorrection;
+  }
+  else if ( mVerticalAnchorPoint == Bottom )
+  {
+    offsetY -= anchorPointCorrection;
+  }
 }
 
 QPointF QgsMarkerSymbolLayerV2::_rotatedOffset( const QPointF& offset, double angle )

src/core/symbology-ng/qgssymbollayerv2.h

@@ -124,16 +124,16 @@ class CORE_EXPORT QgsMarkerSymbolLayerV2 : public QgsSymbolLayerV2
 
     enum HorizontalAnchorPoint
     {
-        Left,
-        HCenter,
-        Right
+      Left,
+      HCenter,
+      Right
     };
 
     enum VerticalAnchorPoint
     {
-        Top,
-        VCenter,
-        Bottom
+      Top,
+      VCenter,
+      Bottom
     };
 
     virtual void renderPoint( const QPointF& point, QgsSymbolV2RenderContext& context ) = 0;
@@ -166,6 +166,12 @@ class CORE_EXPORT QgsMarkerSymbolLayerV2 : public QgsSymbolLayerV2
     virtual void setOutputUnit( QgsSymbolV2::OutputUnit unit );
     virtual QgsSymbolV2::OutputUnit outputUnit() const;
 
+    void setHorizontalAnchorPoint( HorizontalAnchorPoint h ) { mHorizontalAnchorPoint = h; }
+    HorizontalAnchorPoint horizontalAnchorPoint() const { return mHorizontalAnchorPoint; }
+
+    void setVerticalAnchorPoint( VerticalAnchorPoint v ) { mVerticalAnchorPoint = v; }
+    VerticalAnchorPoint verticalAnchorPoint() const { return mVerticalAnchorPoint; }
+
   protected:
     QgsMarkerSymbolLayerV2( bool locked = false );
     //handles marker offset and anchor point shift together

src/gui/symbology-ng/qgssymbollayerv2widget.cpp

@@ -320,6 +320,14 @@ void QgsSimpleMarkerSymbolLayerV2Widget::setSymbolLayer( QgsSymbolLayerV2* layer
   mOutlineWidthUnitComboBox->blockSignals( true );
   mOutlineWidthUnitComboBox->setCurrentIndex( mLayer->outlineWidthUnit() );
   mOutlineWidthUnitComboBox->blockSignals( false );
+
+  //anchor points
+  mHorizontalAnchorComboBox->blockSignals( true );
+  mVerticalAnchorComboBox->blockSignals( true );
+  mHorizontalAnchorComboBox->setCurrentIndex( mLayer->horizontalAnchorPoint() );
+  mVerticalAnchorComboBox->setCurrentIndex( mLayer->verticalAnchorPoint() );
+  mHorizontalAnchorComboBox->blockSignals( false );
+  mVerticalAnchorComboBox->blockSignals( false );
 }
 
 QgsSymbolLayerV2* QgsSimpleMarkerSymbolLayerV2Widget::symbolLayer()
@@ -440,6 +448,24 @@ void QgsSimpleMarkerSymbolLayerV2Widget::on_mDataDefinedPropertiesButton_clicked
   }
 }
 
+void QgsSimpleMarkerSymbolLayerV2Widget::on_mHorizontalAnchorComboBox_currentIndexChanged( int index )
+{
+  if ( mLayer )
+  {
+    mLayer->setHorizontalAnchorPoint(( QgsMarkerSymbolLayerV2::HorizontalAnchorPoint ) index );
+    emit changed();
+  }
+}
+
+void QgsSimpleMarkerSymbolLayerV2Widget::on_mVerticalAnchorComboBox_currentIndexChanged( int index )
+{
+  if ( mLayer )
+  {
+    mLayer->setVerticalAnchorPoint(( QgsMarkerSymbolLayerV2::VerticalAnchorPoint ) index );
+    emit changed();
+  }
+}
+
 
 ///////////
 

src/gui/symbology-ng/qgssymbollayerv2widget.h

@@ -110,6 +110,8 @@ class GUI_EXPORT QgsSimpleMarkerSymbolLayerV2Widget : public QgsSymbolLayerV2Wid
     void on_mOutlineWidthUnitComboBox_currentIndexChanged( int index );
     void on_mDataDefinedPropertiesButton_clicked();
     void on_mOutlineWidthSpinBox_valueChanged( double d );
+    void on_mHorizontalAnchorComboBox_currentIndexChanged( int index );
+    void on_mVerticalAnchorComboBox_currentIndexChanged( int index );
 
   protected:
     QgsSimpleMarkerSymbolLayerV2* mLayer;