RectangleMeshGenerator.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "IndexTypes.h"
#include "Math/UnrealMathSSE.h"
#include "Math/Vector.h"
#include "MeshShapeGenerator.h"
#include "Misc/EnumClassFlags.h"
 
namespace UE
{
namespace Geometry
{
 
class FRectangleMeshGenerator : public FMeshShapeGenerator
{
public:
    FVector3d Origin;
    FVector3f Normal;
 
    double Width;
    double Height;
 
    int WidthVertexCount;
    int HeightVertexCount;
 
    bool bScaleUVByAspectRatio = true;
 
    bool bSinglePolyGroup = false;
 
    FIndex2i IndicesMap;
 
public:
    GEOMETRYCORE_API FRectangleMeshGenerator();
 
    GEOMETRYCORE_API virtual FMeshShapeGenerator& Generate() override;
 
    virtual FVector3d MakeVertex(int CornerIndex, double x, double y)
    {
        FVector3d v(0, 0, 0);
        v[IndicesMap.A] = x;
        v[IndicesMap.B] = y;
        return Origin + v;
    }
 
};
 
enum class ERoundedRectangleCorner : uint8
{
    None = 0,
    BottomLeft = 1,
    BottomRight = 2,
    TopLeft = 4,
    TopRight = 8,
    All = 15
};
ENUM_CLASS_FLAGS(ERoundedRectangleCorner);
 
class FRoundedRectangleMeshGenerator : public FRectangleMeshGenerator
{
public:
    double Radius;
 
    int AngleSamples;
 
 
    ERoundedRectangleCorner SharpCorners;
 
    static inline bool SideInCorners(int SideX, int SideY, ERoundedRectangleCorner Corners)
    {
        int SideInCorners = int(Corners)&((SideY ? 4 : 1) * (SideX ? 2 : 1));
        return SideInCorners != 0;
    }
 
    static inline int NumSharpCorners(ERoundedRectangleCorner SharpFlags)
    {
        int NumSharp = 0;
        int FlagsValue = (int)SharpFlags;
        while (FlagsValue)
        {
            FlagsValue &= (FlagsValue - 1);
            NumSharp++;
        }
        return NumSharp;
    }
 
public:
    GEOMETRYCORE_API FRoundedRectangleMeshGenerator();
 
    GEOMETRYCORE_API virtual FMeshShapeGenerator& Generate() override;
};
 
 
} // end namespace UE::Geometry
} // end namespace UE