Nevron .NET Vision Documentation
Data Pan Tool

The data pan tool allows the user to interactively modify the current zoom range by pressing the mouse over the chart and then dragging.

Creating a Data Pan Tool

The following code snippet adds a data pan tool to the Tools collection of the control:

C#
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NThinChartControl1.Controller.Tools.Add(new NDataPanTool());

Visual Basic
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NThinChartControl1.Controller.Tools.Add(New NDataPanTool())

Setting The Zooming Axes

The data pan tool by default allows panning of the PrimaryX and PrimaryY axes of the currently selected chart. To modify this you need to change the XAxisId or YAxisId properties. The following code snippet tells the data pan to use the Secondary Y axis for panning:

C#
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NDataZoomTool dataZoomTool = new NDataZoomTool();
dataZoomTool.YAxisId = (int)StandardAxis.SecondaryY;
NThinChartControl1.Controller.Tools.Add(dataZoomTool);

Visual Basic
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Dim dataZoomTool As New NDataZoomTool()
dataZoomTool.YAxisId =
CType(StandardAxis.SecondaryY, Integer)
NThinChartControl1.Controller.Tools.Add(dataZoomTool)

Data Pan Sample

The following code snippet shows how to create a simple XY scatter chart with data panning and scrolling. The example intercepts the DataPanCallback in order to update the label with the current X / Y ranges:

C#
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public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!NThinChartControl1.Initialized)

{

NThinChartControl1.Panels.Clear();

// add a label

NLabel label = new NLabel();

label.Dock = DockStyle.Top;

NThinChartControl1.Panels.Add(label);

// get the default chart

NCartesianChart chart = new NCartesianChart();

NThinChartControl1.Panels.Add(chart);

chart.Dock = DockStyle.Fill;

chart.BoundsMode = BoundsMode.Stretch;

chart.Margins = new NMarginsL(10, 10, 10, 10);

chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator = new NLinearScaleConfigurator();

chart.Axis(StandardAxis.PrimaryX).ScrollBar.Visible = true;

chart.Axis(StandardAxis.PrimaryY).ScrollBar.Visible = true;

// create a XY scatter point

NPointSeries point = new NPointSeries();

chart.Series.Add(point);

point.UseXValues = true;

point.DataLabelStyle.Visible = false;

// add some random data

Random rand = new Random();

for (int i = 0; i < 100; i++)

{

point.Values.Add(rand.Next(100));

point.XValues.Add(rand.Next(100));

}

// zoom the axes initially

NThinChartControl1.RecalcLayout();

chart.Axis(StandardAxis.PrimaryX).PagingView.ZoomIn(new NRange1DD(0, 10), 0.0001);

chart.Axis(StandardAxis.PrimaryY).PagingView.ZoomIn(new NRange1DD(0, 10), 0.0001);

// hide the scrollbars

chart.Axis(StandardAxis.PrimaryX).ScrollBar.Visible = false;

chart.Axis(StandardAxis.PrimaryY).ScrollBar.Visible = false;

label.Text = FormatLabel(NThinChartControl1, chart.Axis(StandardAxis.PrimaryX), chart.Axis(StandardAxis.PrimaryY));

// enable tiling

NThinChartControl1.ServerSettings.EnableTiledZoom = true;

// set the active chart

NThinChartControl1.Controller.SetActivePanel(chart);

// add data zoom tool

NDataPanTool dataZoomTool = new NDataPanTool();

dataZoomTool.DataPanCallback = new DataPanCallback();

NThinChartControl1.Controller.Tools.Add(dataZoomTool);

}

}

private static string FormatLabel(NThinChartControl control, NAxis horzAxis, NAxis vertAxis)

{

control.RecalcLayout();

NRange1DD xRange = horzAxis.Scale.RulerRange;

NRange1DD yRange = vertAxis.Scale.RulerRange;

return "XBegin[" + xRange.Begin.ToString("0.0") + "], XEnd [" + xRange.End.ToString("0.0") + "], YBegin [" + yRange.Begin.ToString("0.0") + "], YEnd [" + yRange.End.ToString("0.0") + "]";

}

[Serializable]

class DataPanCallback : INDataPanCallback

{

#region INDataPanCallback Members

public void OnDataPan(NThinChartControl control, NCartesianChart chart, NAxis horzAxis, NAxis vertAxis)

{

control.Labels[0].Text = FormatLabel(control, horzAxis, vertAxis);

}

#endregion

}

}

 

Related Examples
Web Forms\ThinWeb\Data Pan Tool
Mvc\ThinWeb\Data Pan Tool

 

 


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