C++ FGeometry::GetAccumulatedRenderTransform方法代码示例

void SInvalidationPanel::Tick( const FGeometry& AllottedGeometry, const double InCurrentTime, const float InDeltaTime )
{
	if ( GetCanCache() )
	{
		const bool bWasCachingNeeded = bNeedsCaching;

		if ( bNeedsCaching == false )
		{
			if ( bCacheRelativeTransforms )
			{
				// If the container we're in has changed in either scale or the rotation matrix has changed, 
				if ( AllottedGeometry.GetAccumulatedLayoutTransform().GetScale() != LastAllottedGeometry.GetAccumulatedLayoutTransform().GetScale() ||
					 AllottedGeometry.GetAccumulatedRenderTransform().GetMatrix() != LastAllottedGeometry.GetAccumulatedRenderTransform().GetMatrix() )
				{
					InvalidateCache();
				}
			}
			else
			{
				// If the container we're in has changed in any way we need to invalidate for sure.
				if ( AllottedGeometry.GetAccumulatedLayoutTransform() != LastAllottedGeometry.GetAccumulatedLayoutTransform() ||
					AllottedGeometry.GetAccumulatedRenderTransform() != LastAllottedGeometry.GetAccumulatedRenderTransform() )
				{
					InvalidateCache();
				}
			}

			if ( AllottedGeometry.GetLocalSize() != LastAllottedGeometry.GetLocalSize() )
			{
				InvalidateCache();
			}
		}

		LastAllottedGeometry = AllottedGeometry;

		// TODO We may be double pre-passing here, if the invalidation happened at the end of last frame,
		// we'll have already done one pre-pass before getting here.
		if ( bNeedsCaching )
		{
			SlatePrepass(AllottedGeometry.Scale);
			CachePrepass(SharedThis(this));
		}
	}
}

	/**  SWidget interface */
	virtual int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const override
	{
		// First paint the background
		{
			LayerId = PaintBackground(AllottedGeometry, MyClippingRect, OutDrawElements, LayerId);
			LayerId++;
		}

		FArrangedChildren ArrangedChildren(EVisibility::Visible);
		ArrangeChildren(AllottedGeometry, ArrangedChildren);

		// Draw the child nodes

		// When drawing a marquee, need a preview of what the selection will be.
		const auto* SelectionToVisualize = &(SelectionManager.SelectedNodes);
		FGraphPanelSelectionSet SelectionPreview;
		if (Marquee.IsValid())
		{			
			ApplyMarqueeSelection(Marquee, SelectionManager.SelectedNodes, SelectionPreview);
			SelectionToVisualize = &SelectionPreview;
		}
	
		int32 NodesLayerId = LayerId;

		for (int32 ChildIndex = 0; ChildIndex < ArrangedChildren.Num(); ++ChildIndex)
		{
			FArrangedWidget& CurWidget = ArrangedChildren[ChildIndex];
			TSharedRef<SWorldTileItem> ChildNode = StaticCastSharedRef<SWorldTileItem>(CurWidget.Widget);
		
			ChildNode->bAffectedByMarquee = SelectionToVisualize->Contains(ChildNode->GetObjectBeingDisplayed());
			LayerId = CurWidget.Widget->Paint(Args.WithNewParent(this), CurWidget.Geometry, MyClippingRect, OutDrawElements, NodesLayerId, InWidgetStyle, ShouldBeEnabled(bParentEnabled));
			ChildNode->bAffectedByMarquee = false;
		}
		
		// Draw editable world bounds
		if (!WorldModel->IsSimulating())
		{
			float ScreenSpaceSize = FLevelCollectionModel::EditableAxisLength()*GetZoomAmount()*2.f;
			FVector2D PaintSize = FVector2D(ScreenSpaceSize, ScreenSpaceSize);
			FVector2D PaintPosition = GraphCoordToPanelCoord(FVector2D::ZeroVector) - (PaintSize*0.5f);
			float Scale = 0.2f; // Scale down drawing border
			FSlateLayoutTransform LayoutTransform(Scale, AllottedGeometry.GetAccumulatedLayoutTransform().GetTranslation() + PaintPosition);
			FSlateRenderTransform RenderTransform(Scale, AllottedGeometry.GetAccumulatedRenderTransform().GetTranslation() + PaintPosition);
			FPaintGeometry EditableArea(LayoutTransform, RenderTransform, PaintSize/Scale);

			FLinearColor PaintColor = FLinearColor::Yellow;
			PaintColor.A = 0.4f;

			FSlateDrawElement::MakeBox(
				OutDrawElements,
				++LayerId,
				EditableArea,
				FEditorStyle::GetBrush(TEXT("Graph.CompactNode.ShadowSelected")),
				MyClippingRect,
				ESlateDrawEffect::None,
				PaintColor
				);
		}
		
		// Draw the marquee selection rectangle
		PaintMarquee(AllottedGeometry, MyClippingRect, OutDrawElements, ++LayerId);

		// Draw the software cursor
		PaintSoftwareCursor(AllottedGeometry, MyClippingRect, OutDrawElements, ++LayerId);

		if(WorldModel->IsSimulating())
		{
			// Draw a surrounding indicator when PIE is active, to make it clear that the graph is read-only, etc...
			FSlateDrawElement::MakeBox(
				OutDrawElements,
				LayerId,
				AllottedGeometry.ToPaintGeometry(),
				FEditorStyle::GetBrush(TEXT("Graph.PlayInEditor")),
				MyClippingRect
				);
		}

		// Draw observer location
		{
			FVector ObserverPosition;
			FRotator ObserverRotation;
			if (WorldModel->GetObserverView(ObserverPosition, ObserverRotation))
			{
				FVector2D ObserverPositionScreen = GraphCoordToPanelCoord(FVector2D(ObserverPosition.X, ObserverPosition.Y));
				const FSlateBrush* CameraImage = FEditorStyle::GetBrush(TEXT("WorldBrowser.SimulationViewPositon"));
	
				FPaintGeometry PaintGeometry = AllottedGeometry.ToPaintGeometry(
					ObserverPositionScreen - CameraImage->ImageSize*0.5f, 
					CameraImage->ImageSize
					);

				FSlateDrawElement::MakeRotatedBox(
					OutDrawElements,
					++LayerId,
					PaintGeometry,
					CameraImage,
					MyClippingRect,
					ESlateDrawEffect::None,
					FMath::DegreesToRadians(ObserverRotation.Yaw),
//.........这里部分代码省略.........