怎样让绘制的矩形边框以1Hz频率闪烁

Question

在用ActiveX控件绘图时，我想为一幅位图加上一个以1Hz频率闪动的黄色矩形边框。为控件添加了Oncreate和Ontimer函数，在oncreate里面设置了定时器settimer（1,1000，NULL），在Ontimer中添加了如下代码：
void CRunPlanInfoCtrl::OnTimer(UINT_PTR nIDEvent)
{
// TODO: Add your message handler code here and/or call default
CDC* pDC=GetDC();
pDC->SetBkMode(TRANSPARENT);
if (m_D6InfoCtrl==11||m_D6InfoCtrl==13||m_D6InfoCtrl==14)
{
CPen newpen(PS_SOLID,1,RGB(223,223,0));      // 定义黄色画笔
CPen* oldpen=pDC->SelectObject(&newpen);
                   // 绘制矩形
pDC->MoveTo(m_ptOrigin.x+m_smallchange2/6,m_ptOrigin.y+m_smallchange2/6);
pDC->LineTo(m_D6Length-m_ptOrigin.x-m_smallchange2/6,m_ptOrigin.y+m_smallchange2/6);
pDC->MoveTo(m_D6Length-m_ptOrigin.x-m_smallchange2/6,m_ptOrigin.y+m_smallchange2/6);
pDC->LineTo(m_D6Length-m_ptOrigin.x-m_smallchange2/6,m_D6Length-m_ptOrigin.y-m_smallchange2/6);
pDC->MoveTo(m_D6Length-m_ptOrigin.x-m_smallchange2/6,m_D6Length-m_ptOrigin.y-m_smallchange2/6);
pDC->LineTo(m_ptOrigin.x+m_smallchange2/6,m_D6Length-m_ptOrigin.y-m_smallchange2/6);
pDC->MoveTo(m_ptOrigin.x+m_smallchange2/6,m_D6Length-m_ptOrigin.y-m_smallchange2/6);
pDC->LineTo(m_ptOrigin.x+m_smallchange2/6,m_ptOrigin.y+m_smallchange2/6);
pDC->SelectObject(oldpen);
}
CPen newpen1(PS_SOLID,1,RGB(3,17,34));              // 选择背景色画笔颜色，使黄色矩形边框消失
CPen* oldpen1=pDC->SelectObject(&newpen1); pDC->MoveTo(m_ptOrigin.x+m_smallchange2/6,m_ptOrigin.y+m_smallchange2/6);
pDC->LineTo(m_D6Length-m_ptOrigin.x-m_smallchange2/6,m_ptOrigin.y+m_smallchange2/6);
pDC->MoveTo(m_D6Length-m_ptOrigin.x-m_smallchange2/6,m_ptOrigin.y+m_smallchange2/6);
pDC->LineTo(m_D6Length-m_ptOrigin.x-m_smallchange2/6,m_D6Length-m_ptOrigin.y-m_smallchange2/6);
pDC->MoveTo(m_D6Length-m_ptOrigin.x-m_smallchange2/6,m_D6Length-m_ptOrigin.y-m_smallchange2/6);
pDC->LineTo(m_ptOrigin.x+m_smallchange2/6,m_D6Length-m_ptOrigin.y-m_smallchange2/6);
pDC->MoveTo(m_ptOrigin.x+m_smallchange2/6,m_D6Length-m_ptOrigin.y-m_smallchange2/6);
pDC->LineTo(m_ptOrigin.x+m_smallchange2/6,m_ptOrigin.y+m_smallchange2/6); pDC->SelectObject(oldpen1);
COleControl::OnTimer(nIDEvent);
}
我这样做了之后貌似并没有出现边框的闪烁，如果用Invalidate()的话会使得整个控件闪烁，大家又啥好的解决办法吗？求助

Answer 1

你稍微变一下,在第一个timer时,画成黄色的,在下一个timer时擦掉.是不是就有闪烁的效果了

Answer 2

不是很清楚你的意思，在settimer了之后Ontimer每1s都要重新执行一次吧。你的意思是把绘制黄色矩形边框的那部分代码放到Ondraw里面，然后在Ontimer中执行有newpen1的那段代码？如果是这样，我试过，黄色边框是有了，但是只能显示一秒，一秒钟之后该区域被重新填回背景色时，就一直不会出现黄色边框了。

Answer 3

每次Ontimer的时候记一下数m_Index++，Ontimer里面m_Index为奇数时画黄边框，偶数时画白边框

Answer 4

该问题已解决，谢谢King_hhuang。给分！