kev/Drawer/Module/GeoSigmaDraw/ItemCurveArc.h

#pragma once
#include "ItemCurve.h"
#include "ItemArc.h"
#include "ItemSelectElement.h"
#include <vector>

namespace NItem
{
	class CItemCurveArc :
		public CItemCurve
	{
	public:
		CItemCurveArc(CSigmaDoc * ppDoc);
		virtual ~CItemCurveArc(void);

	protected:
		CItemArc* m_pArc;

	public:
		void OnLButtonDown(CDC *pDC, UINT nFlags, CPoint point, int vk) override;
		int OnMouseMove(CDC* pDC, UINT nFlags, CPoint point) override;//, BYTE*& destBuffer, int& destLen);
		void OnLButtonUp(CDC* pDC, UINT nFlags, CPoint point, int vk) override;
		virtual void SetCurveState(int state, CDC * pDC);
		int loop;
		BOOL IsArcState(void);
	};

	class CItemCurveSpline :
		public CItemCurveArc
	{
	public:
		CItemCurveSpline(CSigmaDoc * ppDoc);
		virtual ~CItemCurveSpline(void);

	public:
		void OnDraw(CXyDC* pDC) override;
		void OnLButtonDown(CDC *pDC, UINT nFlags, CPoint point, int vk) override;
		
		int OnMouseMove(CDC* pDC, UINT nFlags, CPoint point) override;
		void OnLButtonUp(CDC *pDc, UINT nFlags, CPoint point, int vk) override;
		virtual void SetCurveState(int state, CDC * pDC);
		virtual void AppendPoint(void);
		void clearSplineData();
		BOOL OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) override;
		void EraseAuxiliarySpline(CDC * pScreenDC);
		void DrawAssistant(CDC * pDC, int mouseX, int mouseY) override;
		void AutoClose(void) override;
		POSITION NextCurve(void) override;
		void Undo(void) override;
		void Redo(void) override;
		BOOL IsCanUndo(void) override;
		BOOL IsCanRedo(void) override;
		void OnCancel(void) override;

		BOOL IsSplineState(void);
		void RemoveTail(void);
		BOOL IsOnlyPointListTail(void);
	protected:
		void BuildSplineCurve(const CPointList& controlPoints, CPointList& outSampledPoints);
		void DrawSplineCurve(CXyDC* pDC, const CPointList& controlPoints);
		void DrawControlPointHandles(CXyDC* pDC, const CPointList& controlPoints);
		void ErasePreview(CDC* pScreenDC);
		void DrawPreview(CDC* pScreenDC);
		
		CPointList m_controlPoints;  // single source of truth: spline control points
		std::vector<CPoint> m_cachedScreenPoints;  // cached screen coordinates for XOR erase
		
	private:
		void DrawControlPointHandles(CDC* pDC);
		
		// Diff and incremental drawing helpers
		size_t FindCommonPrefixLength(const std::vector<CPoint>& oldPoints, 
		                               const std::vector<CPoint>& newPoints);
		void DrawPolylineXOR(CDC* pDC, const std::vector<CPoint>& points, size_t startIdx);
		void IncrementalUpdatePreview(CDC* pScreenDC, const std::vector<CPoint>& newScreenPoints);
		
		int m_nSplineNodes;
		int m_mSmoothStepFactor;
	};

	class CItemCurveMerge :
		public CItemCurveSpline
	{
	public:
		CItemCurveMerge(CSigmaDoc * ppDoc);
		virtual ~CItemCurveMerge(void);

		void OnLButtonDown(CDC *pDC, UINT nFlags, CPoint point, int vk) override;
		int OnMouseMove(CDC *pDC, UINT nFlags, CPoint point) override;// , BYTE*& destBuffer, int& destLen);
		void OnLButtonUp(CDC *pDC, UINT nFlags, CPoint point, int vk) override;
		void DrawAssistant(CDC * pDC, int mouseX, int mouseY) override;
		virtual BOOL OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message);
		void EndCurve();
		void AddCurve();
		void AutoClose(void);
		void ChangeMergeState();
		virtual void OnCancel(void) override;
		virtual void SetCurveState(int state, CDC * pDC) override;
	protected:
		void EreaseOldLine();
		void DrawLine(dfPoint pt1, dfPoint pt2);
		void MergeElement(POSITION pos, CPoint2D& dp);
		CItemSelectElement * m_pItemSelect;
		CPointList m_ptDisposableList;
	public:
		BOOL IsMergeState(void);
	};

};