How to retrieve the selected range in the .Net WinForms Chart Control?

Question

I\'m using the C# built-in Winforms Chart control (System.Windows.Forms.DataVisualization.Charting.Chart) with its built-in ability to let the user select a range. What I\'d

Answer 1

In addition to redtuna to set cursors in a c# chart:

It worked for me to use "SelectionRangeChanging" instead of "SelectionRangeChanged" to not get the NaN issue:

When initializing the Form

this.chart1.SelectionRangeChanging += chart1_SelectionRangeChanging;

and

        chart1.ChartAreas[0].CursorX.IsUserEnabled = false;         // red cursor at SelectionEnd
        chart1.ChartAreas[0].CursorX.IsUserSelectionEnabled = true;
        chart1.ChartAreas[0].AxisX.ScaleView.Zoomable = false;      // zoom into SelectedRange
        chart1.ChartAreas[0].AxisX.ScrollBar.IsPositionedInside = true;
        chart1.ChartAreas[0].CursorX.Interval = 0.01;               // set "resolution" of CursorX

What is executed if the range is chosen / the cursors are set

private void chart1_SelectionRangeChanging(object sender, CursorEventArgs e)
    {
        double x1 = x1 = e.NewSelectionStart; // or: chart1.ChartAreas[0].CursorX.SelectionStart;
        double x2 = e.NewSelectionEnd;        // or: x2 = chart1.ChartAreas[0].CursorX.SelectionEnd;

        double diffx1x2 = x2 - x1;
    }    

To zoom in & out (x-axis) I just added a button that takes the cursor values. That way zooming by mouseClick (ScaleView.Zoomable = false;) does not interfere my cursor positioning :)

 private void button_ZoomIn(object sender, EventArgs e)
    {
        double x1 = chart1.ChartAreas[0].CursorX.SelectionStart;  // x1 = X1
        double x2 = chart1.ChartAreas[0].CursorX.SelectionEnd;    // x2 = X2

        if (x2 > x1)
        {
            // hard setting: chart1.ChartAreas[0].AxisX.Minimum = x1;
            // hard setting: chart1.ChartAreas[0].AxisX.Maximum = x2;
            chart1.ChartAreas[0].AxisX.ScaleView.Zoom(x1,x2); // dynamic approach with scrollbar
        }
        else
        {
            chart1.ChartAreas[0].AxisX.ScaleView.Zoom(x2,x1);
        }
    }

Zoom out

private void button_ZoomOut(object sender, EventArgs e)
    {
        chart1.ChartAreas[0].AxisX.ScaleView.ZoomReset(0);
    }

Zooming can also be implemented by mouseWheel: how to enable zooming in Microsoft chart control by using Mouse wheel And if you also want right-click action in the chart: How to get a right click mouse event? Changing EventArgs to MouseEventArgs causes an error in Form1Designer?