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Hello, I would like to get the X value of a point at user mouse click. I thought it will be easy as in theory I should be just using the NHitTestResult at the mouse click event. Unfortunately my DataPointIndex is always 0, the parent node perfectly found but nothing else. I am not sure if it is to do with my chart setup of with something else so I thought the best would be to post my code: I have a class which needs an NChartControl to set up the relevant chart: public HistoryGraphControl(Nevron.Chart.WinForm.NChartControl nChartControl1) { NDataZoomTool m_DataZoomTool = new NDataZoomTool(); this.nChartControl1 = nChartControl1; nChartControl1.MouseDown += new MouseEventHandler(nChartControl1_MouseClick); #region chart set up
// configure the chart m_Chart = (NCartesianChart)nChartControl1.Charts[0];
NStandardFrameStyle frameStyle = (NStandardFrameStyle)nChartControl1.BackgroundStyle.FrameStyle; frameStyle.Visible = false; m_Chart.Location = new NPointL(new NLength(0, NRelativeUnit.ParentPercentage), new NLength(10, NRelativeUnit.ParentPercentage)); m_Chart.Size = new NSizeL(new NLength(99, NRelativeUnit.ParentPercentage), new NLength(84, NRelativeUnit.ParentPercentage));
NCartesianChart chart = (NCartesianChart)nChartControl1.Charts[0]; chart.Projection.SetPredefinedProjection(PredefinedProjection.Orthogonal); chart.BoundsMode = BoundsMode.Stretch;
NRangeSelection rangeSelection = new NRangeSelection(); rangeSelection.ZoomOutResetsAxis = true; chart.RangeSelections.Add(rangeSelection); chart.Axis(StandardAxis.PrimaryX).ScrollBar.Visible = true; chart.Axis(StandardAxis.PrimaryY).ScrollBar.Visible = true;
rightAxes = m_Chart.Axis(StandardAxis.SecondaryY); rightAxes.Anchor = new NDockAxisAnchor(AxisDockZone.FrontRight, true); rightAxes.Visible = true; ((NStandardScaleConfigurator)rightAxes.ScaleConfigurator).LabelStyle.TextStyle = new NTextStyle(new Font("Verdana", 12), Color.Black);
//set up axis X NAxis axiss = m_Chart.Axis(StandardAxis.PrimaryX); NDateTimeScaleConfigurator dateTimeScale = new NDateTimeScaleConfigurator(); dateTimeScale.MajorGridStyle.LineStyle.Pattern = LinePattern.Dot; dateTimeScale.MajorGridStyle.SetShowAtWall(ChartWallType.Back, true); dateTimeScale.MajorGridStyle.SetShowAtWall(ChartWallType.Floor, false); dateTimeScale.MaxTickCount = 10; dateTimeScale.CustomStep = new NDateTimeSpan(1, NDateTimeUnit.Hour); dateTimeScale.MajorTickMode = MajorTickMode.AutoMaxCount; dateTimeScale.AutoDateTimeUnits = new NDateTimeUnit[] { NDateTimeUnit.Hour }; dateTimeScale.RoundToTickMin = false; dateTimeScale.RoundToTickMax = false; dateTimeScale.EnableUnitSensitiveFormatting = false; dateTimeScale.LabelValueFormatter = new NDateTimeValueFormatter("dd-MMM-yy \r\n HH:mm"); axiss.ScaleConfigurator = dateTimeScale;
nChartControl1.Settings.AnimationInterval = 50; m_DataZoomTool.AnimateZooming = true; m_DataZoomTool.AnimationSteps = 10;
m_Legend = new NLegend(); m_Legend.Mode = LegendMode.Manual; m_Legend.Margins = new NMarginsL(10, 10, 10, 3);
m_Chart.DisplayOnLegend = m_Legend; m_Legend.Visible = true; m_Legend.Dock = DockStyle.Bottom; m_Legend.FitAlignment = ContentAlignment.MiddleCenter; m_Legend.BoundsMode = BoundsMode.Fit;
m_Legend.Data.ExpandMode = (LegendExpandMode)1; Array values = Enum.GetValues(typeof(ContentAlignment)); m_Legend.FitAlignment = (ContentAlignment)values.GetValue(7);
nChartControl1.Panels.Add(m_Legend);
nChartControl1.Controller.Selection.Add(chart); nChartControl1.Controller.Tools.Add(new NAxisScrollTool()); nChartControl1.Controller.Tools.Add(m_DataZoomTool);
NStandardScaleConfigurator scaleConfiguratorX = (NStandardScaleConfigurator)m_Chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator; scaleConfiguratorX.Title.Text = "Date/Time"; scaleConfiguratorX.LabelStyle.TextStyle = new NTextStyle(new Font("Verdana", 12), Color.Black); scaleConfiguratorX.Title.TextStyle.FontStyle = new NFontStyle("Verdana", 12, FontStyle.Regular);
NStandardScaleConfigurator scaleConfiguratorY = (NStandardScaleConfigurator)m_Chart.Axis(StandardAxis.PrimaryY).ScaleConfigurator; scaleConfiguratorY.Title.Text = "Scale 1"; scaleConfiguratorY.LabelStyle.TextStyle = new NTextStyle(new Font("Verdana", 12), Color.Black); scaleConfiguratorY.Title.TextStyle.FontStyle = new NFontStyle("Verdana", 12, FontStyle.Regular);
NStandardScaleConfigurator scaleConfiguratorY2 = (NStandardScaleConfigurator)m_Chart.Axis(StandardAxis.SecondaryY).ScaleConfigurator; scaleConfiguratorY2.Title.Text = "Scale 2"; scaleConfiguratorY2.LabelStyle.TextStyle = new NTextStyle(new Font("Verdana", 12), Color.Black); scaleConfiguratorY2.Title.TextStyle.FontStyle = new NFontStyle("Verdana", 12, FontStyle.Regular);
#endregion
}
void nChartControl1_MouseClick(object sender, MouseEventArgs e) { NHitTestResult hitTestResult = nChartControl1.HitTest(e.X, e.Y); Console.WriteLine("Data point [" + hitTestResult.DataPointIndex.ToString() + "] from series [" + ((NSeriesBase)hitTestResult.Object.ParentNode).Name + "]");
}
//add values to the graph public void addValues(List<Tuple<DateTime, double>> values, string lineName, Color graphColor, bool leftAxis, double hourOffset, string graphType) { colors.Add(graphColor); switch (graphType) { case "X": addXLine(lineName, leftAxis, graphColor); break; default: addNormalLine(lineName, leftAxis, graphColor); break; }
for (int i = 0; i < values.Count; i++) { NLineSeries line = (NLineSeries)lineList[lineList.Count - 1]; line.XValues.Add((values[i].Item1.AddHours(hourOffset)).ToOADate()); line.Values.Add(values[i].Item2); line.BorderStyle.Color = graphColor; }
nChartControl1.Refresh(); }
public void addXLine(string name, bool leftAxis, Color color) { if (name == null || name.Length < 0) name = "Excel data"; // add a line series NLineSeries m_Line = new NLineSeries(); m_Line = (NLineSeries)m_Chart.Series.Add(SeriesType.Line); m_Line.Name = name; m_Line.InflateMargins = true; m_Line.DataLabelStyle.Visible = false; m_Line.MarkerStyle.Visible = true; m_Line.MarkerStyle.PointShape = PointShape.Cylinder; m_Line.MarkerStyle.Width = new NLength(1.5f, NRelativeUnit.ParentPercentage); m_Line.MarkerStyle.Height = new NLength(1.5f, NRelativeUnit.ParentPercentage); m_Line.SamplingMode = SeriesSamplingMode.Enabled;
m_Line.DataLabelStyle.VertAlign = VertAlign.Center; m_Line.DataLabelStyle.Format = "<value>"; m_Line.DataLabelStyle.TextStyle.FillStyle = new NColorFillStyle(Color.White); m_Line.DataLabelStyle.TextStyle.FontStyle.EmSize = new NLength(1.4f, NRelativeUnit.RootPercentage); m_Line.DataLabelStyle.TextStyle.BackplaneStyle.Visible = false;
m_Line.Legend.Mode = SeriesLegendMode.Series; m_Line.UseXValues = true; m_Line.BorderStyle.Color = color;
if (leftAxis) { m_Line.DisplayOnAxis(StandardAxis.PrimaryY, true); m_Line.DisplayOnAxis(StandardAxis.SecondaryY, false); } else { m_Line.DisplayOnAxis(StandardAxis.PrimaryY, false); m_Line.DisplayOnAxis(StandardAxis.SecondaryY, true); }
addLegend(name, color); lineList.Add(m_Line); colors.Add(color); }
When I click on any of the data points I get the following output: Data point [0] from series ["line name"] It would be appreciated if you could let me know the reason why I do not get the right data point index. Regards, Daniel
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Group: Forum Members
Last Active: Last Week
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Hi Daniel, The problem is that you enable line sampling: ENPieLabelModem_Line.SamplingMode = SeriesSamplingMode.Enabled; in which case the line series does not record per data point interactivity information for performance reasons.
Best Regards, Nevron Support Team
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Group: Forum Members
Last Active: 8 Years Ago
Posts: 61,
Visits: 35
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Thank you, it did fix my problem.
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