#include "StdAfx.h"
#include "CurveEditorLinear.h"
#include "SigmaDoc.h"

namespace NItem
{


void CurveEditorLinear::OnDrawDragPreview()
{
	if (NewPointList.IsEmpty()) return;

	CXyDC* pDC = GetDC();
	CPen pen(PS_SOLID, 0, DRAG_LINE_COLOR);
	CPen* op = m_pScreenDC->SelectObject(&pen);
	int od = m_pScreenDC->SetROP2(R2_NOTXORPEN);

	dfPoint dp1, dp2;
	POSITION pos;

	dp1 = NewPointList.GetHead();

	pos = NewPointList.GetHeadPosition();
	if (pos) NewPointList.GetNext(pos);
	while (pos)
	{
		dp2 = NewPointList.GetNext(pos);

		CPoint ptS1 = pDC->GetScreen(dp1);
		m_pScreenDC->MoveTo(ptS1);
		CPoint ptS2 = pDC->GetScreen(dp2);
		m_pScreenDC->LineTo(ptS2);

		dp1 = dp2;
	}
	m_pScreenDC->SetROP2(od);
	m_pScreenDC->SelectObject(op);
}

void CurveEditorLinear::OnCalculateDragEffect(CPointList* pList)
{
	// ========== ???????????????????¦¶??? ==========
	BOOL bRedraw = TRUE;
	BOOL bAttachProcess = TRUE;
	CCurveEx* pValue = (CCurveEx*)GetDoc()->GetDraw()->GetAtValue(GetPos());
	
	if (pList)
	{
		CCurveEx* pc = new CCurveEx;
		*pc = *pValue;
		pValue = pc;
		bRedraw = FALSE;
		bAttachProcess = FALSE;
	}

	CPointList oldPoints;
	CPointList newPoints;
	dfPoint pt;

	// ?????????????????§ß??
	int begin, end;
	GetDragPoint(c_last, NewPointList, begin, end);

	// ???????????????????
	POSITION pos = NewPointList.GetHeadPosition();
	for (int i = begin; i <= end && pos; i++)
	{
		dfPoint dp = NewPointList.GetNext(pos);

		// ?????????
		if (bAttachProcess)
		{
			pValue->GetPoint(i, pt);
			oldPoints.AddTail(pt);
		}

		// ????????
		pValue->x[i] = dp.x0;
		pValue->y[i] = dp.y0;

		// ?????????
		if (bAttachProcess)
		{
			pValue->GetPoint(i, pt);
			newPoints.AddTail(pt);
		}
	}
	if (pValue->bAutoLocation) pValue->GetLocation();

	// ??????
	if (bAttachProcess)
	{
		if (oldPoints.GetCount() > 0)
			AttachProcess(oldPoints, newPoints);
	}

	if (pList)
	{
		pValue->GetPoint(*pList);
		delete pValue;
	}
}

double CurveEditorLinear::GetPointOffset(double offset, int nMode)
{
	// ????????????????????§³
	switch (nMode)
	{
	case DRAG_NODE_LINE:
		offset = 1.0 - offset;  // ???????
		break;
	case DRAG_NODE_COS:
		// ?????????????????????????????????????????
		offset = 1.0 + cos(PI * offset);
		offset *= offset * 0.25;
		break;
	}
	return offset;
}

void CurveEditorLinear::GetDragPoint(CPoint2D& dp, CPointList& NewPointList, int& begin, int& end)
{
	int i = GetHandleIndex();
	if (i < 0) return;
	NewPointList.RemoveAll();
	CCurveEx* pValue = (CCurveEx*)GetDoc()->GetDraw()->GetAtValue(GetPos());
	dfPoint cp, t;
	double distance, x0, y0, d;
	int j;
	begin = i;
	end = i;
	distance = 9;  // ??????9????¦Ë
	GetXY(pValue, i, cp);
	
	// ????????????????????
	for (j = i; j >= 0; j--)
	{
		GetXY(pValue, j, t);
		d = fabs(t.l - cp.l);
		begin = j;
		if (d >= distance)
		{
			NewPointList.AddHead(t);
			break;
		}
		// ??????????
		x0 = GetPointOffset(d / distance, GetOffsetMode());
		y0 = (x0) * (dp.y0 - cp.y0);
		x0 = (x0) * (dp.x0 - cp.x0);
		t.Offset(x0, y0);
		NewPointList.AddHead(t);
	}
	
	// ????????????????????????????
	for (j = i + 1; j < pValue->num; j++)
	{
		GetXY(pValue, j, t);
		d = fabs(t.l - cp.l);
		end = j;
		if (d >= distance)
		{
			NewPointList.AddTail(t);
			break;
		}
		// ??????????
		x0 = GetPointOffset(d / distance, GetOffsetMode());
		y0 = (x0) * (dp.y0 - cp.y0);
		x0 = (x0) * (dp.x0 - cp.x0);
		t.Offset(x0, y0);
		NewPointList.AddTail(t);
	}
}

}; // namespace