adjusts click coordinates according to DPR

coordinates are now recomputed to adjust for devicePixelRatio different from 1 (on high dpi monitors)

SelectionBasePlugin.cc

@@ -1271,9 +1271,11 @@ void SelectionBasePlugin::slotMouseLassoSelection(QMouseEvent* _event) {
     size_t node_idx, target_idx;
     ACG::Vec3d hit_point;
 
-    int y = PluginFunctions::viewerProperties().glState().context_height() - _event->pos().y();
-    if (!PluginFunctions::scenegraphPick(ACG::SceneGraph::PICK_FACE, _event->pos(), node_idx, target_idx, &hit_point))
-        hit_point = PluginFunctions::viewerProperties().glState().unproject(ACG::Vec3d(_event->pos().x(), y, 0.5));
+    const QPoint event_pos = PluginFunctions::adjustForDevicePixelRatio(_event->pos());
+
+    int y = PluginFunctions::viewerProperties().glState().context_height() - event_pos.y();
+    if (!PluginFunctions::scenegraphPick(ACG::SceneGraph::PICK_FACE, event_pos, node_idx, target_idx, &hit_point))
+        hit_point = PluginFunctions::viewerProperties().glState().unproject(ACG::Vec3d(event_pos.x(), y, 0.5));
     
     // Do rendering of mouse tool...
     if(_event->type() == QEvent::MouseButtonPress && _event->button() == Qt::LeftButton) {
@@ -1338,9 +1340,11 @@ void SelectionBasePlugin::slotMouseVolumeLassoSelection(QMouseEvent* _event) {
     size_t node_idx, target_idx;
     ACG::Vec3d hit_point;
 
-    int y = PluginFunctions::viewerProperties().glState().context_height() - _event->pos().y();
-    if (!PluginFunctions::scenegraphPick(ACG::SceneGraph::PICK_FACE, _event->pos(), node_idx, target_idx, &hit_point))
-        hit_point = PluginFunctions::viewerProperties().glState().unproject(ACG::Vec3d(_event->pos().x(), y, 0.5));
+    const QPoint event_pos = PluginFunctions::adjustForDevicePixelRatio(_event->pos());
+
+    int y = PluginFunctions::viewerProperties().glState().context_height() - event_pos.y();
+    if (!PluginFunctions::scenegraphPick(ACG::SceneGraph::PICK_FACE, event_pos, node_idx, target_idx, &hit_point))
+        hit_point = PluginFunctions::viewerProperties().glState().unproject(ACG::Vec3d(event_pos.x(), y, 0.5));
     
     // Do rendering of mouse tool...
     if(_event->type() == QEvent::MouseButtonPress && _event->button() == Qt::LeftButton) {
@@ -1410,6 +1414,8 @@ void SelectionBasePlugin::slotMouseSphereSelection(QMouseEvent* _event) {
     // Ignore context menu for sphere selection
     if (_event->button() == Qt::RightButton) return;
     
+    const QPoint event_pos = PluginFunctions::adjustForDevicePixelRatio(_event->pos());
+
     // Do rendering of mouse tool...
     size_t node_idx, target_idx;
     ACG::Vec3d hit_point;
@@ -1419,7 +1425,7 @@ void SelectionBasePlugin::slotMouseSphereSelection(QMouseEvent* _event) {
 
     // Pick anything to find all possible objects
     if (PluginFunctions::scenegraphPick(ACG::SceneGraph::PICK_ANYTHING,
-            _event->pos(), node_idx, target_idx, &hit_point)) {
+            event_pos, node_idx, target_idx, &hit_point)) {
         
         BaseObjectData* object = 0;