我的 WinForm 上有一個圖表，顯示來自生命體征監視器的 EKG 信號。該圖表在 X 軸上有一個滾動條，允許用戶來回滾動以查看他們希望的任何點的信號。這很好用。圖表實時更新。
圖表中的資料在表單加載時顯示。我遇到的問題是，如果用戶關閉并重新打開表單，滾動條按鈕會將自身重置到最左側。我希望滾動條按鈕位于圖表中等于當前日期時間的點，但我無法通過查看圖表控制元件找到任何方法來做到這一點。谷歌搜索沒有成功。
這是我的圖表設定：
private void InitializeChartEKG() {
chartEKG.ChartAreas[0].AxisX.Title = "Time";
chartEKG.ChartAreas[0].AxisX.MajorTickMark.Enabled = true;
chartEKG.ChartAreas[0].AxisX.MinorTickMark.Enabled = true;
chartEKG.ChartAreas[0].AxisX.IsStartedFromZero = true;
chartEKG.ChartAreas[0].CursorX.LineColor = Color.LawnGreen;
chartEKG.ChartAreas[0].CursorY.LineColor = Color.LawnGreen;
chartEKG.ChartAreas[0].AxisX.MajorGrid.Enabled = true;
chartEKG.ChartAreas[0].AxisX.MajorGrid.Interval = 100;
chartEKG.ChartAreas[0].AxisX.IsStartedFromZero = true;
chartEKG.ChartAreas[0].AxisX.MajorTickMark.Enabled = true;
chartEKG.ChartAreas[0].AxisX.Minimum = 0;
chartEKG.ChartAreas[0].AxisY.Maximum = 600;
chartEKG.ChartAreas[0].AxisY.Minimum = -600;
chartEKG.ChartAreas[0].AxisX.Interval = 10000;
chartEKG.ChartAreas[0].AxisY.Title = "mV";
chartEKG.Series[0].XValueType = ChartValueType.DateTime;
chartEKG.Series[0].YValueType = ChartValueType.Int32;
chartEKG.ChartAreas[0].AxisX.IntervalType = DateTimeIntervalType.Auto;
chartEKG.ChartAreas[0].AxisX.LabelStyle.IntervalType = DateTimeIntervalType.Auto;
chartEKG.ChartAreas[0].AxisX.LabelStyle.Format = "HH:mm:ss tt";
chartArea = chartEKG.ChartAreas[0];
chartArea.AxisX.ScaleView.SizeType = DateTimeIntervalType.Auto;
int position = 0;
int blockSize = 10000;
int size = blockSize;
chartArea.AxisX.ScaleView.Zoom(position, size);
chartArea.AxisX.ScaleView.SmallScrollSize = blockSize;
chartArea.CursorX.AutoScroll = true;
chartArea.AxisX.ScrollBar.BackColor = Color.LightGray;
chartArea.AxisX.ScrollBar.ButtonColor = Color.LightSteelBlue;
chartArea.AxisX.ScrollBar.LineColor = Color.DarkBlue;
chartArea.AxisX.ScrollBar.ButtonStyle = ScrollBarButtonStyles.SmallScroll;
CultureInfo culture = new CultureInfo("en-US");
}
在我呼叫的方法中添加我認為我可以做的點：
chartEKG.Invoke(new Action(() => chartEKG.ChartAreas[0].AxisX.ScaleView.Position = chartEKG.ChartAreas[0].AxisX.Maximum - SomeNumber);
但我不確定如何計算 SomeNumber
uj5u.com熱心網友回復：
終于能夠找到解決方案。在將點添加到圖表的方法中，我修改了添加點的回圈：
foreach (string point in count) {
try {
time = time.AddMilliseconds(2);
chartEKG.Invoke(new Action(() => series1.Points.AddXY(time, Convert.ToDouble(point) * 0.61)));
}
catch (ArgumentException) { }
loopCount = loopCount 1;
string timeFormat = "yyyyMMddHHmmssfff";
string timeNow = DateTime.Now.ToString(timeFormat);
if (time == DateTime.ParseExact(DateTime.Now.ToString(timeNow), timeFormat, CultureInfo.InvariantCulture)) {
loopToStopAt = loopCount;
}
}
然后在那個 foreach 回圈下面，我放置了這段代碼：
chartEKG.Invoke(new Action(() => chartEKG.ChartAreas[0].AxisX.ScaleView.Scroll(chartEKG.ChartAreas[0].AxisX.Maximum - Convert.ToDouble(loopToStopAt))));
這將以編程方式將滑塊拖動到圖表的最右側，這正是我想要的。
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標籤：C＃表格图表滚动条