328 lines
12 KiB
C++
328 lines
12 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "StateMachineConnectionDrawingPolicy.h"
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#include "AnimStateEntryNode.h"
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#include "AnimStateNodeBase.h"
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#include "AnimStateTransitionNode.h"
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#include "AnimationStateNodes/SGraphNodeAnimTransition.h"
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#include "Containers/Set.h"
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#include "EdGraph/EdGraphPin.h"
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#include "Layout/ArrangedChildren.h"
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#include "Layout/ArrangedWidget.h"
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#include "Layout/PaintGeometry.h"
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#include "Math/Color.h"
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#include "Math/UnrealMathSSE.h"
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#include "Misc/Optional.h"
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#include "Rendering/DrawElements.h"
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#include "Rendering/RenderingCommon.h"
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#include "SGraphNode.h"
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#include "SGraphPin.h"
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#include "Styling/SlateBrush.h"
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#include "Templates/Casts.h"
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#include "Math/UnrealMathUtility.h"
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#include "Brushes/SlateRoundedBoxBrush.h"
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#include "Styling/StyleColors.h"
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class FSlateRect;
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class SWidget;
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struct FGeometry;
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/////////////////////////////////////////////////////
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// FStateMachineConnectionDrawingPolicy
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FStateMachineConnectionDrawingPolicy::FStateMachineConnectionDrawingPolicy(int32 InBackLayerID, int32 InFrontLayerID, float ZoomFactor, const FSlateRect& InClippingRect, FSlateWindowElementList& InDrawElements, UEdGraph* InGraphObj)
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: FConnectionDrawingPolicy(InBackLayerID, InFrontLayerID, ZoomFactor, InClippingRect, InDrawElements)
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, GraphObj(InGraphObj)
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{
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}
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void FStateMachineConnectionDrawingPolicy::DetermineWiringStyle(UEdGraphPin* OutputPin, UEdGraphPin* InputPin, /*inout*/ FConnectionParams& Params)
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{
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Params.bUserFlag2 = true;
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Params.AssociatedPin1 = OutputPin;
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Params.AssociatedPin2 = InputPin;
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Params.WireThickness = 1.5f;
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if (InputPin)
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{
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if (UAnimStateTransitionNode* TransNode = Cast<UAnimStateTransitionNode>(InputPin->GetOwningNode()))
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{
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const bool IsInputPinHovered = HoveredPins.Contains(InputPin);
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Params.WireColor = SGraphNodeAnimTransition::StaticGetTransitionColor(TransNode, IsInputPinHovered);
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Params.bUserFlag1 = TransNode->Bidirectional;
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}
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}
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const bool bDeemphasizeUnhoveredPins = HoveredPins.Num() > 0;
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if (bDeemphasizeUnhoveredPins)
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{
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ApplyHoverDeemphasis(OutputPin, InputPin, /*inout*/ Params.WireThickness, /*inout*/ Params.WireColor);
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}
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// Make the transition that is currently relinked, semi-transparent.
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for (const FRelinkConnection& Connection : RelinkConnections)
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{
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if (InputPin == nullptr || OutputPin == nullptr)
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{
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continue;
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}
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const FGraphPinHandle SourcePinHandle = Connection.SourcePin;
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const FGraphPinHandle TargetPinHandle = Connection.TargetPin;
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// Skip all transitions that don't start at the node our dragged and relink transition starts from
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if (OutputPin->GetOwningNode()->NodeGuid == SourcePinHandle.NodeGuid)
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{
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// Safety check to verify if the node is a transition node
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if (UAnimStateTransitionNode* TransitonNode = Cast<UAnimStateTransitionNode>(InputPin->GetOwningNode()))
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{
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if (UEdGraphPin* TransitionOutputPin = TransitonNode->GetOutputPin())
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{
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if (TargetPinHandle.NodeGuid == TransitionOutputPin->GetOwningNode()->NodeGuid)
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{
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Params.WireColor.A *= 0.2f;
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}
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}
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}
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}
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}
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}
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void FStateMachineConnectionDrawingPolicy::DetermineLinkGeometry(
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FArrangedChildren& ArrangedNodes,
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TSharedRef<SWidget>& OutputPinWidget,
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UEdGraphPin* OutputPin,
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UEdGraphPin* InputPin,
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/*out*/ FArrangedWidget*& StartWidgetGeometry,
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/*out*/ FArrangedWidget*& EndWidgetGeometry
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)
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{
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if (UAnimStateEntryNode* EntryNode = Cast<UAnimStateEntryNode>(OutputPin->GetOwningNode()))
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{
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StartWidgetGeometry = PinGeometries->Find(OutputPinWidget);
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UAnimStateNodeBase* State = CastChecked<UAnimStateNodeBase>(InputPin->GetOwningNode());
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int32 StateIndex = NodeWidgetMap.FindChecked(State);
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EndWidgetGeometry = &(ArrangedNodes[StateIndex]);
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}
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else if (UAnimStateTransitionNode* TransNode = Cast<UAnimStateTransitionNode>(InputPin->GetOwningNode()))
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{
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UAnimStateNodeBase* PrevState = TransNode->GetPreviousState();
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UAnimStateNodeBase* NextState = TransNode->GetNextState();
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if ((PrevState != NULL) && (NextState != NULL))
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{
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int32* PrevNodeIndex = NodeWidgetMap.Find(PrevState);
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int32* NextNodeIndex = NodeWidgetMap.Find(NextState);
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if ((PrevNodeIndex != NULL) && (NextNodeIndex != NULL))
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{
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StartWidgetGeometry = &(ArrangedNodes[*PrevNodeIndex]);
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EndWidgetGeometry = &(ArrangedNodes[*NextNodeIndex]);
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}
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}
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}
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else
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{
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StartWidgetGeometry = PinGeometries->Find(OutputPinWidget);
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if (TSharedPtr<SGraphPin>* pTargetWidget = PinToPinWidgetMap.Find(InputPin))
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{
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TSharedRef<SGraphPin> InputWidget = (*pTargetWidget).ToSharedRef();
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EndWidgetGeometry = PinGeometries->Find(InputWidget);
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}
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}
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}
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void FStateMachineConnectionDrawingPolicy::Draw(TMap<TSharedRef<SWidget>, FArrangedWidget>& InPinGeometries, FArrangedChildren& ArrangedNodes)
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{
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// Build an acceleration structure to quickly find geometry for the nodes
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NodeWidgetMap.Empty();
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for (int32 NodeIndex = 0; NodeIndex < ArrangedNodes.Num(); ++NodeIndex)
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{
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FArrangedWidget& CurWidget = ArrangedNodes[NodeIndex];
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TSharedRef<SGraphNode> ChildNode = StaticCastSharedRef<SGraphNode>(CurWidget.Widget);
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NodeWidgetMap.Add(ChildNode->GetNodeObj(), NodeIndex);
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}
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// Now draw
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FConnectionDrawingPolicy::Draw(InPinGeometries, ArrangedNodes);
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}
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void FStateMachineConnectionDrawingPolicy::DrawPreviewConnector(const FGeometry& PinGeometry, const FVector2f& StartPoint, const FVector2f& EndPoint, UEdGraphPin* Pin)
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{
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FConnectionParams Params;
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DetermineWiringStyle(Pin, nullptr, /*inout*/ Params);
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const FVector2f SeedPoint = EndPoint;
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const FVector2f AdjustedStartPoint = FGeometryHelper::FindClosestPointOnGeom(PinGeometry, SeedPoint);
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Params.bUserFlag2 = false; // bUserFlag2 is used to indicate whether the drawn arrow is a preview transition (the temporary transition when creating or relinking).
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DrawSplineWithArrow(AdjustedStartPoint, EndPoint, Params);
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}
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void FStateMachineConnectionDrawingPolicy::DrawSplineWithArrow(const FVector2f& StartAnchorPoint, const FVector2f& EndAnchorPoint, const FConnectionParams& Params)
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{
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Internal_DrawLineWithArrow(StartAnchorPoint, EndAnchorPoint, Params);
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// Is the connection bidirectional?
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if (Params.bUserFlag1)
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{
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Internal_DrawLineWithArrow(EndAnchorPoint, StartAnchorPoint, Params);
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}
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}
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void FStateMachineConnectionDrawingPolicy::Internal_DrawLineWithArrow(const FVector2f& StartAnchorPoint, const FVector2f& EndAnchorPoint, const FConnectionParams& Params)
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{
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//@TODO: Should this be scaled by zoom factor?
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const float LineSeparationAmount = 4.5f;
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const FVector2f DeltaPos = EndAnchorPoint - StartAnchorPoint;
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const FVector2f UnitDelta = DeltaPos.GetSafeNormal();
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const FVector2f Normal = FVector2f(DeltaPos.Y, -DeltaPos.X).GetSafeNormal();
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// Come up with the final start/end points
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const FVector2f DirectionBias = Normal * LineSeparationAmount;
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const FVector2f LengthBias = ArrowRadius.X * UnitDelta;
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const FVector2f StartPoint = StartAnchorPoint + DirectionBias + LengthBias;
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const FVector2f EndPoint = EndAnchorPoint + DirectionBias - LengthBias;
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FLinearColor ArrowHeadColor = Params.WireColor;
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// Draw a line/spline
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DrawConnection(WireLayerID, StartPoint, EndPoint, Params);
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const FVector2f ArrowDrawPos = EndPoint - ArrowRadius;
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const double AngleInRadians = FMath::Atan2(DeltaPos.Y, DeltaPos.X);
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// Draw the transition grab handles in case the mouse is hovering the transition
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bool StartHovered = false;
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bool EndHovered = false;
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const FVector2f FVecMousePos = FVector2f(LocalMousePosition.X, LocalMousePosition.Y);
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const FVector2f ClosestPoint = FMath::ClosestPointOnSegment2D(FVecMousePos, StartPoint, EndPoint);
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if ((ClosestPoint - FVecMousePos).Length() < RelinkHandleHoverRadius)
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{
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StartHovered = (StartPoint - LocalMousePosition).Length() < RelinkHandleHoverRadius;
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EndHovered = (EndPoint - LocalMousePosition).Length() < RelinkHandleHoverRadius;
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FVector2f HoverIndicatorPosition = StartHovered ? StartPoint : EndPoint;
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// Set the hovered pin results. This will be used by the SGraphPanel again.
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const float SquaredDistToPin1 = (Params.AssociatedPin1 != nullptr) ? (StartPoint - LocalMousePosition).SizeSquared() : FLT_MAX;
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const float SquaredDistToPin2 = (Params.AssociatedPin2 != nullptr) ? (EndPoint - LocalMousePosition).SizeSquared() : FLT_MAX;
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if (EndHovered)
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{
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SplineOverlapResult = FGraphSplineOverlapResult(Params.AssociatedPin1, Params.AssociatedPin2, SquaredDistToPin2, SquaredDistToPin1, SquaredDistToPin2, true);
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}
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// Draw grab handles only in case no relinking operation is performed
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if (RelinkConnections.IsEmpty() && Params.bUserFlag2)
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{
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if (EndHovered)
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{
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// Draw solid orange circle behind the arrow head in case the arrow head is hovered (area that enables a relink).
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FSlateRoundedBoxBrush RoundedBoxBrush = FSlateRoundedBoxBrush(
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FLinearColor(0.0f, 0.0f, 0.0f, 0.0f), 9.0f, FStyleColors::AccentOrange, 100.0f);
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FSlateDrawElement::MakeBox(DrawElementsList,
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ArrowLayerID-1, // Draw behind the arrow
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FPaintGeometry(EndPoint - ArrowRadius, BubbleImage->ImageSize * ZoomFactor, ZoomFactor),
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&RoundedBoxBrush);
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ArrowHeadColor = FLinearColor::Black;
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}
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else
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{
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// Draw circle around the arrow in case the transition is hovered (mouse close or over transition line or arrow head).
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const int CircleLineSegments = 16;
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const float CircleRadius = 10.0f;
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const FVector2f CircleCenter = EndPoint - UnitDelta * 2.0f;
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DrawCircle(CircleCenter, CircleRadius, Params.WireColor, CircleLineSegments);
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}
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}
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}
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// Draw the number of relinked transitions on the preview transition.
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if (!RelinkConnections.IsEmpty() && !Params.bUserFlag2)
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{
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// Get the number of actually relinked transitions.
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int32 NumRelinkedTransitions = 0;
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for (const FRelinkConnection& Connection : RelinkConnections)
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{
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NumRelinkedTransitions += UAnimStateTransitionNode::GetListTransitionNodesToRelink(Connection.SourcePin, Connection.TargetPin, SelectedGraphNodes).Num();
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if (UAnimStateEntryNode* EntryNode = Cast<UAnimStateEntryNode>(Connection.SourcePin->GetOwningNode()))
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{
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NumRelinkedTransitions += 1;
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}
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}
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const FVector2f TransitionCenter = StartAnchorPoint + DeltaPos * 0.5f;
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const FVector2f TextPosition = TransitionCenter + Normal * 15.0f * ZoomFactor;
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FSlateDrawElement::MakeText(
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DrawElementsList,
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ArrowLayerID,
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FPaintGeometry(TextPosition, ArrowImage->ImageSize * ZoomFactor, ZoomFactor),
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FText::AsNumber(NumRelinkedTransitions),
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FCoreStyle::Get().GetFontStyle("SmallFont"));
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}
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// Draw the transition arrow triangle
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FSlateDrawElement::MakeRotatedBox(
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DrawElementsList,
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ArrowLayerID,
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FPaintGeometry(ArrowDrawPos, ArrowImage->ImageSize * ZoomFactor, ZoomFactor),
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ArrowImage,
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ESlateDrawEffect::None,
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static_cast<float>(AngleInRadians),
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TOptional<FVector2f>(),
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FSlateDrawElement::RelativeToElement,
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ArrowHeadColor
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);
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}
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void FStateMachineConnectionDrawingPolicy::DrawCircle(const FVector2f& Center, float Radius, const FLinearColor& Color, const int NumLineSegments)
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{
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TempPoints.Empty();
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const float NumFloatLineSegments = (float)NumLineSegments;
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for (int i = 0; i <= NumLineSegments; i++)
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{
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const float Angle = (i / NumFloatLineSegments) * TWO_PI;
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FVector2f PointOnCircle;
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PointOnCircle.X = cosf(Angle) * Radius;
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PointOnCircle.Y = sinf(Angle) * Radius;
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TempPoints.Add(PointOnCircle);
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}
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FSlateDrawElement::MakeLines(
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DrawElementsList,
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ArrowLayerID + 1,
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FPaintGeometry(Center, FVector2f(Radius, Radius) * ZoomFactor, ZoomFactor),
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TempPoints,
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ESlateDrawEffect::None,
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Color
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);
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}
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void FStateMachineConnectionDrawingPolicy::DrawSplineWithArrow(const FGeometry& StartGeom, const FGeometry& EndGeom, const FConnectionParams& Params)
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{
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// Get a reasonable seed point (halfway between the boxes)
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const FVector2f StartCenter = FGeometryHelper::CenterOf(StartGeom);
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const FVector2f EndCenter = FGeometryHelper::CenterOf(EndGeom);
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const FVector2f SeedPoint = (StartCenter + EndCenter) * 0.5f;
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// Find the (approximate) closest points between the two boxes
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const FVector2f StartAnchorPoint = FGeometryHelper::FindClosestPointOnGeom(StartGeom, SeedPoint);
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const FVector2f EndAnchorPoint = FGeometryHelper::FindClosestPointOnGeom(EndGeom, SeedPoint);
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DrawSplineWithArrow(StartAnchorPoint, EndAnchorPoint, Params);
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}
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FVector2f FStateMachineConnectionDrawingPolicy::ComputeSplineTangent(const FVector2f& Start, const FVector2f& End) const
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{
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const FVector2f Delta = End - Start;
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const FVector2f NormDelta = Delta.GetSafeNormal();
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return NormDelta;
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}
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