www.pudn.com > drawpad.zip > rbdcircle.cpp

#include "stdafx.h" 
#include "rbdcircle.h" 
#include "DrawPadDoc.h" 
#include "math.h" 
 
RBD_CIRCLE::RBD_CIRCLE(const CPoint& start) 
{ 
	m_nStart = start; 
} 
 
RBD_CIRCLE::~RBD_CIRCLE() 
{ 
 
} 
 
void RBD_CIRCLE::DrawXor(CDC *pDC, const PICK_EVENT& pe) 
{ 
	CPen pen, *oldpen; 
	CDrawPadDoc *pDoc; 
	pDoc = (CDrawPadDoc*)m_pLastView->GetDocument(); 
	int width = pDoc->m_nWidth; 
	pen.CreatePen(PS_SOLID, width, pDoc->m_nColor); 
	pDC->SelectStockObject(NULL_BRUSH); 
	CPoint m_nEnd; 
	m_nEnd = pe.pick(); 
	long r; 
	r = (long)sqrt(pow((float)(m_nEnd.x - m_nStart.x),2) + 
		pow((float)(m_nEnd.y - m_nStart.y),2)); 
 
	CRect rect(m_nStart.x - r,m_nStart.y - r, 
		m_nStart.x + r,m_nStart.y + r); 
//	pen.CreatePen(PS_SOLID, 1, RGB(192,192,192)); 
	oldpen = pDC->SelectObject(&pen); 
	//pDC->MoveTo(m_nStart); 
	//pDC->LineTo(pe.pick()); 
	pDC->Ellipse(rect); 
	pDC->SelectObject(oldpen); 
}