绘图基础--多边形2

绘图基础--多边形2

// polygon2.cpp

#include <afxwin.h>

// Define the application class
class CApp : public CWinApp
{
public:
	virtual BOOL InitInstance();
};

CApp App;  

// define the window class
class CWindow : public CFrameWnd
{ 
public:
	CWindow(); 
	void OnPaint();
	DECLARE_MESSAGE_MAP()
};

// The window's constructor
CWindow::CWindow()
{ 
	Create(NULL, "Drawing Tests",
		WS_OVERLAPPEDWINDOW,
		CRect(0,0,350,300)); 
}

// The message map
BEGIN_MESSAGE_MAP( CWindow, CFrameWnd )
	ON_WM_PAINT()	
END_MESSAGE_MAP()

// Handle exposure
void CWindow::OnPaint()
{
	CPaintDC dc(this);
	
	// Change the pen and the brush
	CPen pen(PS_SOLID, 2, RGB(0,0,255)), *oldPen;
	CBrush brush(RGB(255,0,0)), *oldBrush;
	oldPen = dc.SelectObject(&pen);
	oldBrush = dc.SelectObject(&brush);
	
	// Create the polygon
	CPoint a[10];
	a[0] = CPoint(100,100);	
	a[1] = CPoint(250,100);
	a[2] = CPoint(110,180); 
	a[3] = CPoint(180,30);
	a[4] = CPoint(260,180);    

	dc.SetPolyFillMode(ALTERNATE);
	dc.Polygon(a, 5);
	
	// return old pen and brush
	dc.SelectObject(oldPen);
	dc.SelectObject(oldBrush);
}

// Init the application
BOOL CApp::InitInstance()
{
	m_pMainWnd = new CWindow();
	m_pMainWnd->ShowWindow(m_nCmdShow);
	m_pMainWnd->UpdateWindow();
	return TRUE;
}