kev/Drawer/Module/GeoSigmaDraw/CurveNodeDrawer.h

#pragma once

#include "SigmaDoc.h"
#include "DrawOperator/Xy.h"
#include <cassert>

/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD>·<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 */
class CurveNodeDrawer
{
public:
	CurveNodeDrawer(CSigmaDoc* pDoc)
		: m_pDoc(pDoc)
	{
		assert(m_pDoc != nullptr);
	}

	void Draw(CDC* pDC, CPositionList& positions) const
	{
		if (pDC == nullptr)
		{
			return;
		}

		CSize size = m_pDoc->GetHandleSize();

		POSITION pos = positions.GetHeadPosition();
		while (pos != nullptr)
		{
			POSITION pt = positions.GetNext(pos);
			COne* pOne = m_pDoc->m_pXy->GetAt(pt);
			if (pOne == nullptr)
			{
				continue;
			}

			if (pOne->GetType() != DOUBLEFOX_CURVE)
			{
				continue;
			}

			CCurveEx* pCurve = pOne->GetValueSafe<CCurveEx>();

			DrawSingleNode(pDC, pCurve, size);
		}
	}

private:
	// <20><><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߽ڵ㣨<DAB5><E3A3A8><EFBFBD>Ļ<EFBFBD><C4BB><EFBFBD><EFBFBD>߼<EFBFBD><DFBC><EFBFBD>
	void DrawSingleNode(CDC* pDC, CCurveEx* pCurve, const CSize& handleSize) const
	{
		CSize sz = m_pDoc->GetHandleSize();

		int lastDrawIndex = 0;
		for (int i = 0; i < pCurve->num; i++)
		{
			CPoint pt1 = m_pDoc->GetDC().GetScreen(pCurve->x[i], pCurve->y[i]);
			if (i == 0 || i == pCurve->num - 1)
			{
				m_pDoc->DrawHandle(pCurve->x[i], pCurve->y[i], TRACKER_NO_EDIT, pDC);
			}
			else
			{
				CPoint pt2 = m_pDoc->GetDC().GetScreen(pCurve->x[lastDrawIndex], pCurve->y[lastDrawIndex]);
				if (abs(pt1.x - pt2.x) > sz.cx || abs(pt1.y - pt2.y) > sz.cy)
				{
					m_pDoc->DrawHandle(pCurve->x[i], pCurve->y[i], TRACKER_NO_EDIT, pDC);
					lastDrawIndex = i;
				}
			}
		}
	}

	CSigmaDoc* m_pDoc = nullptr;
};