GizmoElementTriangleList.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "BaseGizmos/GizmoElementBase.h"
#include "InputState.h"
#include "UObject/ObjectMacros.h"
#include "GizmoElementTriangleList.generated.h"
 
UCLASS(Transient, MinimalAPI)
class UGizmoElementTriangleList : public UGizmoElementBase
{
    GENERATED_BODY()
 
public:
 
    //~ Begin UGizmoElementBase Interface.
    INTERACTIVETOOLSFRAMEWORK_API virtual void Render(IToolsContextRenderAPI* RenderAPI, const FRenderTraversalState& RenderState) override;
    INTERACTIVETOOLSFRAMEWORK_API virtual FInputRayHit LineTrace(const UGizmoViewContext* ViewContext, const FLineTraceTraversalState& LineTraceState, const FVector& RayOrigin, const FVector& RayDirection, FLineTraceOutput& OutLineTraceOutput) override;
    //~ End UGizmoElementBase Interface.
 
    // The vertices of the triangle list, each tuple of 3 forming a triangle
    INTERACTIVETOOLSFRAMEWORK_API virtual void SetVertices(const TArrayView<const FVector>& InVertices);
    INTERACTIVETOOLSFRAMEWORK_API virtual const TArray<FVector>& GetVertices() const;
 
    // Base location the triangles
    INTERACTIVETOOLSFRAMEWORK_API virtual void SetBase(FVector InBase);
    INTERACTIVETOOLSFRAMEWORK_API virtual FVector GetBase() const;
 
    // Up direction
    INTERACTIVETOOLSFRAMEWORK_API virtual void SetUpDirection(const FVector& InUpDirection);
    INTERACTIVETOOLSFRAMEWORK_API virtual FVector GetUpDirection() const;
 
    // Side direction
    INTERACTIVETOOLSFRAMEWORK_API virtual void SetSideDirection(const FVector& InSideDirection);
    INTERACTIVETOOLSFRAMEWORK_API virtual FVector GetSideDirection() const;
 
protected:
 
    void ComputeProjectedVertices(const FTransform& InLocalToWorldTransform, bool bIncludeBase);
 
    static bool Intersect(const FRay& Ray, const FVector& A, const FVector& B, const FVector& C, double Tolerance, double& Distance);
 
    // The vertices of the triangle list, each tuple of 3 forming a triangle
    UPROPERTY()
    TArray<FVector> Vertices;
 
    // Base location the triangles
    UPROPERTY()
    FVector Base = FVector::ZeroVector;
 
    // Up direction
    UPROPERTY()
    FVector UpDirection = FVector(0.0f, 0.0f, 1.0f);
 
    // Side direction
    UPROPERTY()
    FVector SideDirection = FVector(0.0f, 1.0f, 0.0f);
 
    TArray<FVector> ProjectedVertices;
};