61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
//
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// This class implements the layout calculatations for a radial
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// menu.
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//
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#pragma once
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#include "CoreMinimal.h"
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#include "RadialMenu.generated.h"
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USTRUCT(BlueprintType)
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struct FRadialMenuItem
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{
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GENERATED_BODY()
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FVector2D Point1 = {0,0};
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FVector2D Point2 = {0,0};
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FVector2D Point3 = {0,0};
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bool RightSide = false;
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};
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UCLASS(BlueprintType)
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class URadialMenu : public UObject
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{
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GENERATED_BODY()
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public:
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UFUNCTION(BlueprintCallable)
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void Configure(int32 NItems, float ItemHeight, float InnerRadius, float MinSpoke, float Spread);
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UFUNCTION(BlueprintCallable)
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int32 NumItems() const { return Items.Num(); }
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UFUNCTION(BlueprintCallable)
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const TArray<FRadialMenuItem> GetItems() const { return Items; }
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TArray<FRadialMenuItem> Items;
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private:
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using View = TArrayView<FRadialMenuItem>;
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void CalculateSide(View V);
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void FlipHorizontal(View V);
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// The half-circle is divided into pie slices. Returns a direction vector
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// which aims directly down the center of the pie slice.
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FVector2D PieSliceToVector(double Slice, double Slices);
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int32 CNItems = 0;
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float CItemHeight = 0;
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float CInnerRadius = 0;
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float CMinSpoke = 0;
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float CSpread = 0;
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int32 CNumLeft = 0;
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int32 CNumRight = 0;
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View LeftItems;
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View RightItems;
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};
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