#include "stdafx.h"
#include "ActionRotationItem.h"
#include "Util.h"
#include "BlobSerializer.h"
#include "SigmaDoc.h"

CActionRotationItem::CActionRotationItem()
	: CActionItem(nullptr, 0)
{
}

CActionRotationItem::CActionRotationItem(CSigmaDoc* ppDoc, UINT actionType, double x, double y, double angle)
	: CActionItem(ppDoc, actionType),
	m_x(x), m_y(y), m_angle(angle)
{
}

CActionRotationItem::CActionRotationItem(CSigmaDoc* ppDoc, UINT actionType, double x, double y, double angle, const CPositionList &elements)
	: CActionItem(ppDoc, actionType),
	m_x(x), m_y(y), m_angle(angle)
{
	CListAddRange(m_elements, elements);
}

void CActionRotationItem::Undo()
{
	Rotation(-m_angle);
}

void CActionRotationItem::Redo()
{
	Rotation(m_angle);
}

void CActionRotationItem::Do()
{
	Rotation(m_angle);
}

void CActionRotationItem::Rotation(double angle)
{
	// 如果角度为 0，则不需要进行任何旋转
	if (fabs(angle) < std::numeric_limits<double>::epsilon())
	{
		return;
	}

	if (!m_elements.IsEmpty()) // 要旋转的是指定图元
	{
		CPtrList* pValues = GetDoc()->GetDraw()->GetValueList();
		POSITION pos = m_elements.GetHeadPosition();
		while (pos != nullptr)
		{
			POSITION pt = m_elements.GetNext(pos);
			COne* pOne = reinterpret_cast<COne*>(pValues->GetAt(pt));
			if (pOne != nullptr)
			{
				pOne->Rotate(m_x, m_y, angle);
			}
		}
	}
	else // 要旋转的是整个图件的图元
	{
		GetDoc()->GetDraw()->Rotate(m_x, m_y, angle);
	}

}

void CActionRotationItem::accept(CActionVisitor& visitor)
{
	visitor.visit(*this);
}