VC++ 在CCanvas裏面繪製空心圓

// 畫空心圓 void DrawCircle(CDC* pDC, COLORREF crLine, RECT* pRc) { if (0) { // GDI方式 CPen pen(PS_SOLID, 1, crLine); HGDIOBJ hOldPen = (HGDIOBJ)::SelectObject(pDC->GetSafeHdc(), (HGDIOBJ)pen.GetSa

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