How to drag the Chart Series Points at run time
4 Oct 20182 minutes to read
You can drag the chart series points by calculating new x and y values while handling any of the ChartRegionMouse Events likeMouseUp, MouseDown, MouseHover, MouseLeave, and so forth, on the chart. The new x and y values of the series are calculated from the mouse point, and GetValueByPoint which returns the x and y values of the mouse point calculated from the Chart Point.
The following code snippet must be given under the mouse event handler of the ChartRegionMouse event.
private void chartControl1_ChartRegionMouseUp(object sender, Syncfusion.Windows.Forms.Chart.ChartRegionMouseEventArgs e)
{
Cursor = Cursors.SizeAll;
if (this.isDragging)
{
double newY = Math.Floor(this.chartControl1.ChartArea.GetValueByPoint(e.Point).YValues[0]);
double newX = this.chartControl1.ChartArea.GetValueByPoint(e.Point).X;
if (newY < 0 || newY >= 50 || newX < 0 || newX > 7)
MessageBox.Show("Cannot drag outside chart bounds");
else
{
this.NewYValue(newY);
this.NewXValue(newX);
}
this.isDragging = false;
this.currentRegion = null;
this.selectedDataPoint.Y = 0;
this.selectedDataPoint.X = 0;
this.chartControl1.Redraw(true);
}
this.chartControl1.Series[0].Style.TextFormat = "{0}";
this.chartControl1.Refresh();
}Private Sub chartControl1_ChartRegionMouseUp(ByVal sender As Object, ByVal e As Syncfusion.Windows.Forms.Chart.ChartRegionMouseEventArgs) Handles chartControl1.ChartRegionMouseUp
Cursor = Cursors.SizeAll
If Me.isDragging Then
Dim newY As Double = Math.Floor(Me.ChartControl1.ChartArea.GetValueByPoint(e.Point).YValues(0))
Dim newX As Double = Me.ChartControl1.ChartArea.GetValueByPoint(e.Point).X
If newY < 0 OrElse newY >= 50 OrElse newX < 0 OrElse newX > 7 Then
MessageBox.Show("Cannot drag outside chart bounds")
Else
Me.NewYValue(newY)
Me.NewXValue(newX)
End If
Me.selectedDataPoint.Y = 0
Me.selectedDataPoint.X = 0
Me.isDragging = False
Me.currentRegion = Nothing
Me.ChartControl1.Redraw(True)
End If
Me.ChartControl1.Series(0).Style.TextFormat = "{0}"
Me.ChartControl1.Refresh()
End Sub