徐景周
///////////////////////////////////////////////////////
//说明：
// 在矩形框中旋转方式显示文字，jingzhou xu
//参数：
// pDC: DC指针
// str: 显示文字
// rect: 显示范围
// angle: 旋转角度
// nOptions: ExtTextOut()中相应设置<ETO_CLIPPED 和 ETO_OPAQUE>
///////////////////////////////////////////////////////
void DrawRotatedText(CDC* pDC, const CString str, CRect rect,
double angle, UINT nOptions)
{
//按比例转换角度值
double pi = 3.141592654;
double radian = pi * 2 / 360 * angle;
//获取显示文字中心点
CSize TextSize = pDC->GetTextExtent(str);
CPoint center;
center.x = TextSize.cx / 2;
center.y = TextSize.cy / 2;
//计算显示文字新的中心点
CPoint rcenter;
rcenter.x = long(cos(radian) * center.x - sin(radian) * center.y);
rcenter.y = long(sin(radian) * center.x + cos(radian) * center.y);
//绘制文字
pDC->SetTextAlign(TA_BASELINE);
pDC->SetBkMode(TRANSPARENT);
pDC->ExtTextOut(rect.left + rect.Width() / 2 - rcenter.x,
rect.top + rect.Height() / 2 + rcenter.y,
nOptions, rect, str, NULL);
}
用法：
DrawRotatedText (pDC,”VC知识库”,CRect(100,100,300,300),15, ETO_CLIPPED);
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