simplify logic

GUI/View/Plotter/ProjectionsPlot.cpp

@@ -240,21 +240,22 @@ void ProjectionsPlot::setGraphFromItem(const LineItem* item)
 {
     if (!m_data_item || !m_data_item->c_field())
         return;
-    if ((dynamic_cast<const HorizontalLineItem*>(item) && m_orientation != Qt::Horizontal)
-	|| (dynamic_cast<const VerticalLineItem*>(item) && m_orientation != Qt::Vertical))
-        return;
+
     QCPGraph* graph = graphForItem(item);
     if (!graph)
 	return;
 
+    // TODO: merge with similar code in ProjectionsSaver::projectionsData ?
     std::unique_ptr<Datafield> field;
-
-    // TODO: merge with very similar code in ProjectionsSaver::projectionsData
-    if (const auto* horLine = dynamic_cast<const HorizontalLineItem*>(item))
-        field.reset(m_data_item->c_field()->xProjection(horLine->pos()));
-    else if (const auto* verLine = dynamic_cast<const VerticalLineItem*>(item))
-        field.reset(m_data_item->c_field()->yProjection(verLine->pos()));
-    else
+    if (dynamic_cast<const HorizontalLineItem*>(item)) {
+	if (m_orientation != Qt::Horizontal)
+	    return;
+        field.reset(m_data_item->c_field()->xProjection(item->pos()));
+    } else if (dynamic_cast<const VerticalLineItem*>(item)) {
+	if (m_orientation != Qt::Vertical)
+	    return;
+        field.reset(m_data_item->c_field()->yProjection(item->pos()));
+    } else
         ASSERT_NEVER;
 
     auto centers = field->axis(0).binCenters();