SCircumferenceMarkerWidget.h

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// Fill out your copyright notice in the Description page of Project Settings.
 
#pragma once
 
#include "Styling/CoreStyle.h"
#include "Widgets/Accessibility/SlateWidgetAccessibleTypes.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SLeafWidget.h"
#include "SCircumferenceMarkerWidget.generated.h"
 
class FPaintArgs;
class FSlateRect;
class FSlateWindowElementList;
class FWidgetStyle;
struct FGeometry;
struct FSlateBrush;
 
USTRUCT(BlueprintType)
struct FCircumferenceMarkerEntry
{
    GENERATED_BODY()
 
    // The angle to place this marker around the circle (in degrees)
    UPROPERTY(EditAnywhere, BlueprintReadWrite, meta=(ForceUnits=deg))
    float PositionAngle = 0.0f;
 
    // The angle to rotate the marker image (in degrees)
    UPROPERTY(EditAnywhere, BlueprintReadWrite, meta=(ForceUnits=deg))
    float ImageRotationAngle = 0.0f;
};
 
class SCircumferenceMarkerWidget : public SLeafWidget
{
    SLATE_BEGIN_ARGS(SCircumferenceMarkerWidget)
        : _MarkerBrush(FCoreStyle::Get().GetBrush("Throbber.CircleChunk"))
        , _Radius(48.0f)
    {
    }
        SLATE_ARGUMENT(const FSlateBrush*, MarkerBrush)
        SLATE_ARGUMENT(TArray<FCircumferenceMarkerEntry>, MarkerList)
        SLATE_ATTRIBUTE(float, Radius)
        SLATE_ATTRIBUTE(FSlateColor, ColorAndOpacity)
    SLATE_END_ARGS()
 
public:
    void Construct(const FArguments& InArgs);
 
    SCircumferenceMarkerWidget();
 
    //~SWidget interface
    virtual int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const override;
    virtual FVector2D ComputeDesiredSize(float) const override;
    virtual bool ComputeVolatility() const override { return true; }
    //~End of SWidget interface
 
    void SetRadius(float NewRadius);
    void SetMarkerList(TArray<FCircumferenceMarkerEntry>& NewMarkerList);
 
private:
    FSlateRenderTransform GetMarkerRenderTransform(const FCircumferenceMarkerEntry& Marker, const float BaseRadius, const float HUDScale) const;
 
private:
    const FSlateBrush* MarkerBrush;
 
    TArray<FCircumferenceMarkerEntry> MarkerList;
 
    TAttribute<float> Radius;
 
    TAttribute<FSlateColor> ColorAndOpacity;
    bool bColorAndOpacitySet;
 
    //@TODO: Make this a 0-1 float alignment instead (e.g., inside/on/outside the radius)?
    uint8 bReticleCornerOutsideSpreadRadius : 1;
};