rm unnecessary dynamic casts

GUI/View/SampleDesigner/ParticleCoreShellForm.cpp

@@ -145,21 +145,21 @@ void ParticleCoreShellForm::onShellComboChanged()
 
 void ParticleCoreShellForm::showCoreInRealSpace()
 {
-    if (ParticleItem* particle = dynamic_cast<ParticleItem*>(m_item->core()))
-        m_ec->requestViewInRealSpace(particle);
+    if (m_item->core())
+        m_ec->requestViewInRealSpace(m_item->core());
 }
 
 void ParticleCoreShellForm::showShellInRealSpace()
 {
-    if (ParticleItem* particle = dynamic_cast<ParticleItem*>(m_item->shell()))
-        m_ec->requestViewInRealSpace(particle);
+    if (m_item->shell())
+        m_ec->requestViewInRealSpace(m_item->shell());
 }
 
 void ParticleCoreShellForm::createCoreWidgets()
 {
     QString groupTitle = "Core";
 
-    if (ParticleItem* particle = dynamic_cast<ParticleItem*>(m_item->core())) {
+    if (ParticleItem* particle = m_item->core()) {
         const QString formFactor =
             particle->formFactorItem()->value().value<ComboProperty>().getValue();
 
@@ -178,7 +178,7 @@ void ParticleCoreShellForm::createShellWidgets()
 {
     QString groupTitle = "Shell";
 
-    if (ParticleItem* particle = dynamic_cast<ParticleItem*>(m_item->shell())) {
+    if (ParticleItem* particle = m_item->shell()) {
         const QString formFactor =
             particle->formFactorItem()->value().value<ComboProperty>().getValue();