BlendSpace1DHelpers.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
 
struct FLineVertex
{
    float Position;
    int32 Index;
    FLineVertex(const float InPosition, const int32 InIndex) : Position(InPosition), Index(InIndex) {}
};
 
struct FLineElement
{
    // Explicit constructor since we need to populate the Range value
    explicit FLineElement(const FLineVertex& InStart, const FLineVertex& InEnd) : Start(InStart), End(InEnd), bIsFirst(false), bIsLast(false)
    {
        Range = End.Position - Start.Position;
    }
 
    bool PopulateElement(const float ElementPosition, struct FEditorElement& InOutElement) const;
    bool IsBlendInputOnLine(const FVector& BlendInput) const
    {
        return (BlendInput.X >= Start.Position) && (BlendInput.X <= End.Position);
    }
 
    const FLineVertex Start;
    const FLineVertex End;
    bool bIsFirst;
    bool bIsLast;
    float Range;
};
 
class FLineElementGenerator
{
public:
    void Init(const struct FBlendParameter& BlendParameter);
 
    void Process();
 
    void CalculateEditorElements();
    
    TArray<struct FBlendSpaceSegment> CalculateSegments() const;
 
    TArray<FLineVertex> SamplePointList;
 
    TArray<struct FEditorElement> EditorElements;
 
private:
 
    float MinGridValue;
    float MaxGridValue;
 
    int32 NumGridPoints;
    int32 NumGridDivisions;
 
    TArray<FLineElement> LineElements;
};