Identifier DrawLine is undefined

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#pragma once

#include "CoreMinimal.h"
#include "Blueprint/UserWidget.h"
#include "Blueprint/WidgetBlueprintLibrary.h"

/**
 * 
 */
class SKETCHWITHDEPTH_API CPP_2D_Curve
{
protected:
	bool is_vertical;
	bool is_dirty;
	TArray<FVector2D> curve_points;
	FColor color;
	FVector4 bounding_box;

public:
	static const float ENDPOINT_SNAP_DISTANCE;

	CPP_2D_Curve();
	CPP_2D_Curve(const CPP_2D_Curve& c1);
	~CPP_2D_Curve();

	int add_curve_point(FVector2D p);
	TArray<FVector2D> get_curve_points();
	void clear_curve();
	void set_curve_color(FColor col);
	FVector2D get_start_point();
	FVector2D get_end_point();
	bool check_if_vertical();
	void draw_curve(FPaintContext &pc, FVector2D viewport_size);
};