GDI/图象编程

开发平台：
Visual C++

DrawEllipse.cpp：源码内容
							// DrawEllipse.cpp: implementation of the CDrawEllipse class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "DrawSys.h"
#include "DrawEllipse.h"
#include "ViewProperty.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
IMPLEMENT_SERIAL(CDrawEllipse, CObject, 1)
CDrawEllipse::CDrawEllipse()
{
	m_ptFirst.x = m_ptFirst.y = 0;
	m_ptSecond.x = m_ptSecond.y = 0;
	m_ptTemp.x = m_ptTemp.y = 0;
	m_bStart = FALSE;
}
CDrawEllipse::~CDrawEllipse()
{
}
void CDrawEllipse::Draw(CDC* pDC)
{
	CRect	rcDraw;
	CBrush*	pBrush		= NULL;
	CBrush*	pOldBrush	= NULL;
	pBrush = CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
	pOldBrush = pDC->SelectObject(pBrush);
	rcDraw.left = m_ptFirst.x;
	rcDraw.top = m_ptFirst.y;
	rcDraw.right = m_ptSecond.x;
	rcDraw.bottom = m_ptSecond.y;
	pDC->Ellipse(&rcDraw);
	pDC->SelectObject(pOldBrush);
}
void CDrawEllipse::OnMouseMove(CDC* pDC, UINT nFlags, CPoint point)
{
	int		iDrawMode	= 0;
	CRect	rcDraw;
	CBrush*	pBrush		= NULL;
	CBrush*	pOldBrush	= NULL;
	if(m_bStart)
	{
		if(pDC)
		{
			pBrush = CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
			pOldBrush = pDC->SelectObject(pBrush);
			iDrawMode = pDC->SetROP2(R2_NOTXORPEN);
			rcDraw.left = m_ptFirst.x;
			rcDraw.top = m_ptFirst.y;
			rcDraw.right = m_ptTemp.x;
			rcDraw.bottom = m_ptTemp.y;
			pDC->Ellipse(&rcDraw);
			m_ptTemp = point;
			rcDraw.right = m_ptTemp.x;
			rcDraw.bottom = m_ptTemp.y;
			pDC->Ellipse(&rcDraw);
			pDC->SetROP2(iDrawMode);
			pDC->SelectObject(pOldBrush);
		}
	}
}
void CDrawEllipse::OnLButtonDown(CDC* pDC, UINT nFlags, CPoint point)
{
	m_ptFirst = point;
	m_ptTemp = point;
	m_bStart = TRUE;
}
BOOL CDrawEllipse::OnLButtonUp(CDC* pDC, UINT nFlags, CPoint point)
{
	int		iDrawMode	= 0;
	CRect	rcDraw;
	CBrush*	pBrush		= NULL;
	CBrush*	pOldBrush	= NULL;
	if(m_bStart)
	{
		if(pDC)
		{
			pBrush = CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
			pOldBrush = pDC->SelectObject(pBrush);
			iDrawMode = pDC->SetROP2(R2_NOTXORPEN);
			rcDraw.left = m_ptFirst.x;
			rcDraw.top = m_ptFirst.y;
			rcDraw.right = m_ptTemp.x;
			rcDraw.bottom = m_ptTemp.y;
			pDC->Ellipse(&rcDraw);
			m_ptSecond = point;
			m_ptTemp = point;
			rcDraw.left = MIN(m_ptFirst.x, m_ptSecond.x);
			rcDraw.top = MIN(m_ptFirst.y, m_ptSecond.y);
			rcDraw.right = MAX(m_ptFirst.x, m_ptSecond.x);
			rcDraw.bottom = MAX(m_ptFirst.y, m_ptSecond.y);
			m_ptFirst.x = rcDraw.left;
			m_ptFirst.y = rcDraw.top;
			m_ptSecond.x = rcDraw.right;
			m_ptSecond.y = rcDraw.bottom;
			pDC->SetROP2(R2_COPYPEN);
			Draw(pDC);
			pDC->SetROP2(iDrawMode);
			pDC->SelectObject(pOldBrush);
		}
		m_bStart = FALSE;
	}
	return (!rcDraw.IsRectEmpty());
}
void CDrawEllipse::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		// TODO: add storing code here
		ar << m_ptFirst << m_ptSecond;
	}
	else
	{
		// TODO: add loading code here
		ar >> m_ptFirst >> m_ptSecond;
	}
}
BOOL CDrawEllipse::PtInShape(CPoint point)
{
	CRect	rcDraw;
	CRgn	rgn;
	BOOL	m_bRetVal	= FALSE;
	rcDraw.left = MIN(m_ptFirst.x, m_ptSecond.x);
	rcDraw.top = MIN(m_ptFirst.y, m_ptSecond.y);
	rcDraw.right = MAX(m_ptFirst.x, m_ptSecond.x);
	rcDraw.bottom = MAX(m_ptFirst.y, m_ptSecond.y);
	rgn.CreateEllipticRgnIndirect(&rcDraw);
	m_bRetVal = rgn.PtInRegion(point);
	rgn.DeleteObject();
	return m_bRetVal;
}
void CDrawEllipse::ShowProperty()
{
	CRect			rcDraw;
	CString			strID;
	CString			strTime;
	CViewProperty	dlg;
	rcDraw.left = m_ptFirst.x;
	rcDraw.top = m_ptFirst.y;
	rcDraw.right = m_ptSecond.x;
	rcDraw.bottom = m_ptSecond.y;
	dlg.m_strType = "椭圆";
	MyFormatString(dlg.m_strID, m_iID);
	dlg.m_iLength = rcDraw.Width();
	dlg.m_iWidth = rcDraw.Height();
	dlg.m_strTime = m_tmCreate.Format("%Y - %m - %d");
	dlg.DoModal();
}

						