Enable pixel selection in density render mode (#210)

Updated ScatterplotPlugin and ScatterplotWidget to allow the pixel selection tool to be enabled and function correctly in both SCATTERPLOT and DENSITY render modes. Adjusted renderer and navigator selection logic to support this change.

Author: ThomasKroes

src/ScatterplotPlugin.cpp

@@ -413,8 +413,11 @@ void ScatterplotPlugin::selectPoints()
 
     auto& pixelSelectionTool = _scatterPlotWidget->getPixelSelectionTool();
 
+    auto  renderer = _settingsAction.getRenderModeAction().getCurrentIndex() > 0 ? dynamic_cast<Renderer2D*>(&_scatterPlotWidget->_densityRenderer) : dynamic_cast<Renderer2D*>(&_scatterPlotWidget->_pointRenderer);
+    auto& navigator = renderer->getNavigator();
+
     // Only proceed with a valid points position dataset and when the pixel selection tool is active
-    if (!_positionDataset.isValid() || !pixelSelectionTool.isActive() || _scatterPlotWidget->_pointRenderer.getNavigator().isNavigating() || !pixelSelectionTool.isEnabled())
+    if (!_positionDataset.isValid() || !pixelSelectionTool.isActive() || navigator.isNavigating() || !pixelSelectionTool.isEnabled())
         return;
 
     auto selectionAreaImage = pixelSelectionTool.getAreaPixmap().toImage();
@@ -428,11 +431,8 @@ void ScatterplotPlugin::selectPoints()
 
     _positionDataset->getGlobalIndices(localGlobalIndices);
 
-    auto& pointRenderer = _scatterPlotWidget->_pointRenderer;
-    auto& navigator     = pointRenderer.getNavigator();
-
     const auto zoomRectangleWorld   = navigator.getZoomRectangleWorld();
-    const auto screenRectangle      = QRect(QPoint(), pointRenderer.getRenderSize());
+    const auto screenRectangle      = QRect(QPoint(), renderer->getRenderSize());
 
     float boundaries[4]{
         std::numeric_limits<float>::max(),
@@ -517,7 +517,7 @@ void ScatterplotPlugin::selectPoints()
         }
     }
 
-    auto& navigationAction = _scatterPlotWidget->getPointRendererNavigator().getNavigationAction();
+    auto& navigationAction = navigator.getNavigationAction();
 
     navigationAction.getZoomSelectionAction().setEnabled(!targetSelectionIndices.empty() && !navigationAction.getFreezeNavigation().isChecked());
 

src/ScatterplotWidget.cpp

@@ -153,7 +153,7 @@ bool ScatterplotWidget::event(QEvent* event)
     }
 
     auto setIsNavigating = [this](bool isNavigating) -> void {
-        _pixelSelectionTool.setEnabled(getRenderMode() == RenderMode::SCATTERPLOT && !isNavigating);
+        _pixelSelectionTool.setEnabled((getRenderMode() == RenderMode::SCATTERPLOT || getRenderMode() == RenderMode::DENSITY) && !isNavigating);
 
         if (isNavigating) {
             _samplerPixelSelectionTool.setEnabled(false);