C / C++ / MFC

class CPieGraph : public CWnd
{
public:
	CPieGraph();
	~CPieGraph();
	void InitPieChart();
	void SetPieChart(PieGraphDisplayType & PieGraph);
	void ResetPieChartAngle(int Angle);
protected:
private:
	void InitDCObjects();
	void RedrawPieChart();
	void RedrawPieText();
	PieGraphDisplayType MainPieGraph;
	CDC PieMemDC;
	CDC TextMemDC;
	CBitmap* OldpieBitmap;
	CBitmap* OldtextBitmap;
	CBitmap m_pieBitmap;
	CBitmap m_textBitmap;
	CBrush CombinedBrush;
	CBrush TargetBrush;
	CPen BlackPen;
	//CBrush WhiteBrush;
	CFont OutputFont;
	//message handlers
	afx_msg void OnPaint();
	afx_msg BOOL OnEraseBkgnd(CDC* pDC);
DECLARE_MESSAGE_MAP()
};

CPieGraph::CPieGraph()
{
	InitPieChart();
	InitDCObjects();
	OldpieBitmap = PieMemDC.SelectObject(&m_pieBitmap);
	OldtextBitmap = TextMemDC.SelectObject(&m_textBitmap);
}
CPieGraph::~CPieGraph()
{
	PieMemDC.SelectObject(OldpieBitmap);
	TextMemDC.SelectObject(OldtextBitmap);
	m_pieBitmap.DeleteObject();
	m_textBitmap.DeleteObject();
}
void CPieGraph::InitPieChart()
{
	CRect ClientArea;
	GetClientRect(&ClientArea);

	MainPieGraph.origin.SetPoint(static_cast<int>(ClientArea.right / 1.5), 
		static_cast<int>(ClientArea.bottom / 2));
	MainPieGraph.angle = 0;
	MainPieGraph.PieGraphIsActive = false;
	MainPieGraph.radius = 100;
	MainPieGraph.data.denominator = 0.0;
	MainPieGraph.data.numerator = 0.0;
	MainPieGraph.data.ratio = 0.0;
}
void CPieGraph::InitDCObjects()
{
	CDC pDC;
	VERIFY(OutputFont.CreateFont(16, 0, 0, 0, FW_NORMAL, FALSE, FALSE, 0, ANSI_CHARSET,            
			OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
			DEFAULT_PITCH | FF_SWISS, "Arial"));
	BlackPen.CreatePen(PS_SOLID, 2, RGB(0, 0, 0));
	TargetBrush.CreateSolidBrush(RGB(95, 158, 160));
	CombinedBrush.CreateHatchBrush(HS_DIAGCROSS, RGB(47, 79, 79));
	m_pieBitmap.CreateCompatibleBitmap(&pDC, 600, 600);
	m_textBitmap.CreateCompatibleBitmap(&pDC, 100, 10);
}
void CPieGraph::RedrawPieChart()
{
	ASSERT((MainPieGraph.radius * 2) < 600);

	CBrush* OldBrush = NULL;
	CPen* OldPen = NULL;
	int Angle = 0;

	if(MainPieGraph.PieGraphIsActive)
		Angle = MainPieGraph.angle;
	else
		Angle = 0;
	
	//draw pie 1
	PieMemDC.BeginPath();
	OldBrush = PieMemDC.SelectObject(&TargetBrush);
	OldPen = PieMemDC.SelectObject(&BlackPen);
	PieMemDC.MoveTo(MainPieGraph.radius, MainPieGraph.radius);
	AngleArc(PieMemDC, MainPieGraph.radius, MainPieGraph.radius, MainPieGraph.radius, 0.0, static_cast<FLOAT>(Angle));
	PieMemDC.LineTo(MainPieGraph.radius, MainPieGraph.radius);
	PieMemDC.EndPath();
	PieMemDC.StrokeAndFillPath();
	PieMemDC.SelectObject(OldBrush);
	
	//draw pie 2
	PieMemDC.BeginPath();
	OldBrush = PieMemDC.SelectObject(&CombinedBrush);
	PieMemDC.MoveTo(MainPieGraph.radius, MainPieGraph.radius);
	AngleArc(PieMemDC, MainPieGraph.radius, MainPieGraph.radius, MainPieGraph.radius, ((360-Angle)*-1), 360-Angle);
	PieMemDC.LineTo(MainPieGraph.radius, MainPieGraph.radius);
	PieMemDC.EndPath();
	PieMemDC.StrokeAndFillPath();
	PieMemDC.SelectObject(OldPen);
	PieMemDC.SelectObject(OldBrush);
}
afx_msg void CPieGraph::OnPaint()
{
	CPaintDC dc(this);

	dc.BitBlt(MainPieGraph.origin.x - MainPieGraph.radius,
		MainPieGraph.origin.y - MainPieGraph.radius - 10,
		100, 10, &TextMemDC, 0, 0, SRCCOPY);
	dc.BitBlt(MainPieGraph.origin.x - MainPieGraph.radius,
		MainPieGraph.origin.y - MainPieGraph.radius,
		MainPieGraph.radius * 2,
		MainPieGraph.radius * 2, &PieMemDC, 0, 0, SRCCOPY);
}
afx_msg BOOL CPieGraph::OnEraseBkgnd(CDC* pDC) 
{
	return TRUE;
}

class CRatiosWin : public CFrameWnd
{
public:
	CRatiosWin(); //default constructor
	~CRatiosWin(); //destructor
...
protected:
private:
	//classes
	CRatiosNewSearchDialog NewSearchDialog;
	CRatiosSearchTimeParameters TimeParametersDialog;
	CStudentCourseLinkedList TestLinkedList;
	CPieGraph PieGraph;
	CDC logo_memDC;
	CBitmap LogoOffScreenBmp;
	CBitmap* OldLogoBitmap;
	CEdit ResultsBox;
	//graphics related members
	CPoint LogoOffSet;
	CPoint TextOffSet;
...

}