#include "stdafx.h"
#include "Stroke.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CStroke

IMPLEMENT_SERIAL(CStroke, CObject, 2)
CStroke::CStroke()
{
	//序列化將使用該空構造函數，不能少
}

CStroke::CStroke(UINT nPenWidth)
{
	m_nPenWidth = nPenWidth;
	m_rectBounding.SetRectEmpty();   //設置為(0,0,0,0)
}

void CStroke::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		ar << m_rectBounding;         //m_rectBounding信息序列化到ar中
		ar << (WORD)m_nPenWidth;      //m_nPenWidth信息序列化到ar中
		m_pointArray.Serialize(ar);   //m_pointArray信息序列化到ar中
	}
	else
	{
		ar >> m_rectBounding;          //ar信息序列化到m_rectBounding中
		WORD w;
		ar >> w;                       //ar信息序列化到w中
		m_nPenWidth = w;
		m_pointArray.Serialize(ar);    //ar信息序列化到m_pointArray中
	}
}

BOOL CStroke::DrawStroke(CDC* pDC)     //畫線函數
{
	CPen penStroke;
	if (!penStroke.CreatePen(PS_SOLID, m_nPenWidth, RGB(0,0,255)))//創建筆對象
		return FALSE;
	CPen* pOldPen = pDC->SelectObject(&penStroke);   //把新創建的筆選進設備上下文，并保存舊的筆對象
	pDC->MoveTo(m_pointArray[0]);                    //移到第一個點
	for (int i=1; i < m_pointArray.GetSize(); i++)   //循環連接所有的點
	{
		pDC->LineTo(m_pointArray[i]);
	}

	pDC->SelectObject(pOldPen);
	return TRUE;
}

void CStroke::FinishStroke()
{
	//計算最小矩形，重畫時需要該矩形。
	if (m_pointArray.GetSize()==0)
	{
		m_rectBounding.SetRectEmpty();
		return;
	}
	CPoint pt = m_pointArray[0];
	m_rectBounding = CRect(pt.x, pt.y, pt.x, pt.y);

	for (int i=1; i < m_pointArray.GetSize(); i++)
	{
		//如果點在矩形m_rectBounding之外，就增大矩形把該點包含進來
		pt = m_pointArray[i];
		m_rectBounding.left     = min(m_rectBounding.left, pt.x);
		m_rectBounding.right    = max(m_rectBounding.right, pt.x);
		m_rectBounding.top      = max(m_rectBounding.top, pt.y);
		m_rectBounding.bottom   = min(m_rectBounding.bottom, pt.y);
	}

    //使m_rectBounding的長寬各增大筆寬m_nPenWidth個單位，以免部分象素不能被更新。
	m_rectBounding.InflateRect(CSize(m_nPenWidth, -(int)m_nPenWidth));
	return;
}