参照“尘中远”大侠的帖子“TeeChart替代品,MFC下好用的高速绘图控件-(Hight-Speed Charting) "
http://blog.csdn.net/czyt1988/article/details/8740500
问题描述:开发环境VC6.0,参照上面的帖子,由于没有现成的代码,返回codeproject.com网站,冒昧的在定时器促发函数中添加如下代码,添加代码1时,在画线的时候采用 AddPoint(X,Y),并将i<200,得到一个半椭圆,与原文差不多。
但想到做动态采集数据用,打算在对话框类中初始化坐标,并触发定时器后,让画线随着采集的点累积似的连接起来,于是将for循环去掉,竟然出现奇葩的现象:结果只出现动态移动的坐标,但不见所画的线,这个问题想来想去想不明白,希望论坛内的高手不吝赐教。
代码1:
void CChartDemoDlg::OnTimer(UINT nIDEvent)
{
// TODO: Add your message handler code here and/or call default
COLORREF SerieColor = RGB(0,255,0);
CChartLineSerie* pLineSeries = m_ChartCtrl1.CreateLineSerie();
pLineSeries->SetSeriesOrdering(poNoOrdering);
pLineSeries->SetColor(SerieColor);
for (int i=0;i<200;i++)
{
double X = 10 * sin(i/360.0 * 2 * 3.141592);
double Y = 10 * cos( (i-60)/360.0 * 2 * 3.141592);
pLineSeries->AddPoint(X,Y);
}
CDialog::OnTimer(nIDEvent);
}
运行如图:
代码2:
void CChartDemoDlg::OnTimer(UINT nIDEvent)
{
// TODO: Add your message handler code here and/or call default
COLORREF SerieColor = RGB(0,255,0);
CChartLineSerie* pLineSeries = m_ChartCtrl1.CreateLineSerie();
pLineSeries->SetSeriesOrdering(poNoOrdering);
pLineSeries->SetColor(SerieColor);
static i=0;
double X = 10 * sin(i/360.0 * 2 * 3.141592);
double Y = 10 * cos( (i-60)/360.0 * 2 * 3.141592);
pLineSeries->AddPoint(X,Y);
i++;
CDialog::OnTimer(nIDEvent);
}
运行如图:
对话框类初始化里代码如下:
BOOL CChartDemoDlg::OnInitDialog()
{
CDialog::OnInitDialog();
CChartAxis *pAxis=NULL;
pAxis=m_ChartCtrl1.CreateStandardAxis(CChartCtrl::BottomAxis);
pAxis->SetAutomatic(true);
pAxis=m_ChartCtrl1.CreateStandardAxis(CChartCtrl::LeftAxis);
pAxis->SetAutomatic(true);
m_ChartCtrl1.EnableRefresh(true);
SetTimer(1,1000,NULL);
// TODO: Add extra initialization here
return TRUE; // return TRUE unless you set the focus to a control
}