做一个圆在按键按下后向右移动，放开后停止。每秒刷新一次。功能不对求教

Question

代码如下。 void CHomeWorkView::OnTimer(UINT_PTR nIDEvent)
{
if (nIDEvent == 102)
{
Invalidate();
}
CView::OnTimer(nIDEvent);
}

void CHomeWorkView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
CDC* pDC=GetDC();
CPoint m_lStartPoint(10, 10), m_rStartPoint(100, 100);
pDC->Ellipse(10, 10, 100, 100);
m_KeyDown = false;
SetTimer(102, 1000, NULL);
if (nChar == 39)
{
m_KeyDown = true;
while(m_KeyDown)
{
pDC->Ellipse(m_lStartPoint.x += 10, m_lStartPoint.y, m_rStartPoint.x += 10, m_rStartPoint.y);
}
}

CView::OnKeyDown(nChar, nRepCnt, nFlags);

}

void CHomeWorkView::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags)
{
if (nChar==39)
{
m_KeyDown = false;
}

CView::OnKeyUp(nChar, nRepCnt, nFlags);

}

Answer 1

定义一个全局变量offset
在按键函数中调用offset++;

在定时器中调用OnDraw

在OnDraw里Ellipse，x+offset