Question

有关计算机图形学用C++编写程序的问题，希望能给出正确代码

1·作图练习

Answer 1

#include <afxwin.h>

class CMainWnd : public CFrameWnd
{
public:
CMainWnd();
protected:
afx_msg void OnPaint();
DECLARE_MESSAGE_MAP()
};

class DrawApp : public CWinApp
{
public:
virtual BOOL InitInstance()
{
CFrameWnd* p = new CMainWnd;
m_pMainWnd = p;
p->ShowWindow(SW_SHOWNORMAL);
p->UpdateWindow();
return TRUE;
}
};

DrawApp app;

BEGIN_MESSAGE_MAP(CMainWnd, CWnd)
ON_WM_PAINT()
END_MESSAGE_MAP()

CMainWnd::CMainWnd()
{
this->Create(NULL, _T("X"));
}

void CMainWnd::OnPaint()
{
CPaintDC dc(this);
dc.Ellipse(0, 0, 100, 100);
dc.Arc(-50, 0, 50, 100, 25, 93, 25, 7);
dc.Arc(50, 0, 150, 100, 75, 7, 75, 93);
dc.Arc(25, -43, 125, 57, 25, 7, 100, 50);
dc.Arc(-25, -43, 75, 57, 0, 57, 25, 7);
dc.Arc(25, 43, 125, 143, 100, 50, 25, 93);
dc.Arc(-25, 43, 75, 143, 75, 93, 0, 50);
}