■ DownSampling 클래스를 사용해 다운 샘플링 차트를 그리는 방법을 보여준다.
▶ MainForm.cs
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using System; using System.Windows.Forms; using Steema.TeeChart; using Steema.TeeChart.Functions; using Steema.TeeChart.Styles; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 포인트 시리즈 /// </summary> private Points points; /// <summary> /// 다운 샘플링 함수 /// </summary> private DownSampling downSampling; /// <summary> /// 패스트 라인 시리즈 /// </summary> private FastLine fastLine; /// <summary> /// X 배열 /// </summary> private Nullable<double>[] xArray; /// <summary> /// Y 배열 /// </summary> private Nullable<double>[] yArray; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); #region 다운 샘플링 메소드 콤보 박스를 설정한다. this.downSamplingMethodComboBox.Items.AddRange(Enum.GetNames(typeof(DownSamplingMethod))); this.downSamplingMethodComboBox.SelectedIndex = 4; #endregion #region X/Y 배열을 설정한다. int length = 20000; xArray = new Nullable<double>[length]; yArray = new Nullable<double>[length]; Random random = new Random(DateTime.Now.Millisecond); for(int i = 0; i < length; i++) { xArray[i] = i; if(i % 20 == 0) { yArray[i] = null; } else { yArray[i] = random.Next(100); } } #endregion #region 포인트 시리즈를 생성한다. this.points = new Points(); this.points.Add(this.xArray, this.yArray); this.points.Active = false; #endregion #region 다운 샘플링 함수를 생성한다. this.downSampling = new DownSampling(); this.downSampling.DisplayedPointCount = 1000; this.downSampling.Method = DownSamplingMethod.MinMaxFirstLastNull; #endregion #region 패스트 라인 시리즈를 생성한다. this.fastLine = new FastLine(); this.fastLine.DataSource = points; this.fastLine.Function = downSampling; this.fastLine.TreatNulls = TreatNullsStyle.DoNotPaint; #endregion #region 티차트를 설정한다. this.tChart.Zoom.Direction = ZoomDirections.Horizontal; this.tChart.Series.Add(points); this.tChart.Series.Add(fastLine); #endregion this.pointCountNumericUpDown.ValueChanged += pointCountNumericUpDown_ValueChanged; this.downSamplingMethodComboBox.SelectedIndexChanged += downSamplingMethodComboBox_SelectedIndexChanged; this.tChart.Zoomed += tChart_Zoomed; this.tChart.UndoneZoom += tChart_UndoneZoom; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private #region 포인트 수 숫자 UP/DOWN 값 변경시 처리하기 - pointCountNumericUpDown_ValueChanged(sender, e) /// <summary> /// 포인트 수 숫자 UP/DOWN 값 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void pointCountNumericUpDown_ValueChanged(object sender, EventArgs e) { this.downSampling.DisplayedPointCount = (int)this.pointCountNumericUpDown.Value; this.tChart.Axes.Bottom.SetMinMax(0, this.tChart[0].Count); this.tChart[1].CheckDataSource(); } #endregion #region 다운 샘플링 메소드 콤보 박스 선택 인덱스 변경시 처리하기 - downSamplingMethodComboBox_SelectedIndexChanged(sender, e) /// <summary> /// 다운 샘플링 메소드 콤보 박스 선택 인덱스 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void downSamplingMethodComboBox_SelectedIndexChanged(object sender, EventArgs e) { this.downSampling.Method = (DownSamplingMethod)Enum.Parse(typeof(DownSamplingMethod), this.downSamplingMethodComboBox.SelectedItem.ToString()); this.tChart[1].CheckDataSource(); } #endregion #region 티차트 확대시 처리하기 - tChart_Zoomed(sender, e) /// <summary> /// 티차트 확대시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void tChart_Zoomed(object sender, EventArgs e) { this.tChart[1].CheckDataSource(); } #endregion #region 티차트 확대 취소시 처리하기 - tChart_UndoneZoom(sender, e) /// <summary> /// 티차트 확대 취소시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void tChart_UndoneZoom(object sender, EventArgs e) { this.tChart.Axes.Bottom.SetMinMax(0, this.tChart[0].Count); this.tChart[1].CheckDataSource(); } #endregion } } |
