78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
//
|
|
// This class implements the layout calculatations for a radial
|
|
// menu.
|
|
//
|
|
|
|
#pragma once
|
|
|
|
#include "CoreMinimal.h"
|
|
#include "RadialMenu.generated.h"
|
|
|
|
|
|
USTRUCT(BlueprintType)
|
|
struct FRadialMenuItem
|
|
{
|
|
GENERATED_BODY()
|
|
|
|
FVector2D Point1 = {0,0};
|
|
FVector2D Point2 = {0,0};
|
|
FVector2D Point3 = {0,0};
|
|
bool RightSide = false;
|
|
};
|
|
|
|
UCLASS(BlueprintType)
|
|
class URadialMenu : public UObject
|
|
{
|
|
GENERATED_BODY()
|
|
|
|
public:
|
|
UFUNCTION(BlueprintCallable)
|
|
void Configure(int32 NItems, float ItemHeight, float InnerRadius, float MinSpoke, float Spread);
|
|
|
|
UFUNCTION(BlueprintCallable)
|
|
int32 LeftNum() const { return NumLeft; }
|
|
|
|
UFUNCTION(BlueprintCallable)
|
|
int32 RightNum() const { return NumRight; }
|
|
|
|
UFUNCTION(BlueprintCallable)
|
|
const TArray<FRadialMenuItem> GetItems() const { return Items; }
|
|
|
|
|
|
private:
|
|
using View = TArrayView<FRadialMenuItem>;
|
|
|
|
// Give the unit vector for the selected spoke. NSide is
|
|
// the number of spokes on the side of the wheel that
|
|
// we're calculating, and NTotal is the total number of
|
|
// spokes on both sides. The spokes on a given side are
|
|
// organized top-to-bottom, and the angle between the
|
|
// spokes is always equal to (1/NTotal) of the circle.
|
|
FVector2D SpokeVector(int32 I, int32 NSide, int32 NTotal);
|
|
|
|
// Populate Point1 and Point2, these are the
|
|
// endpoints of the spoke segment. Spokes are
|
|
// designed to always be long enough to make room
|
|
// for MinSpoke, but also to make enough room to
|
|
// keep the menu items from overlapping.
|
|
void CalculateSpokes(View V, float ItemHeight, float InnerRadius, float MinSpoke);
|
|
|
|
// Search for the widest spoke, and return its X coordinate.
|
|
double WidestSpoke(View V);
|
|
|
|
// Populate Point3, this is the endpoint of the spread
|
|
// line that goes horizontal.
|
|
void CalculateSpread(View V, double Offset);
|
|
|
|
// Flip everything in the specified view horizontally.
|
|
void FlipHorizontal(View V);
|
|
|
|
// The array of items.
|
|
TArray<FRadialMenuItem> Items;
|
|
|
|
// Number of items on the left, and on the right.
|
|
int32 NumLeft = 0;
|
|
int32 NumRight = 0;
|
|
};
|
|
|