Hello, Rodrigo Cesar,
Detecting when an annotation is clicked is not directly supported by
RadChartView. However, you can easily achieve it by calculating the vertical axis value by the mouse position. Here is demonstrated a sample code snippet how to detect when an annotation is clicked:
public RadForm1()
{
InitializeComponent();
BarSeries barSeries = new BarSeries("Performance", "RepresentativeName");
barSeries.Name = "Q1";
barSeries.DataPoints.Add(new CategoricalDataPoint(177, "Harley"));
barSeries.DataPoints.Add(new CategoricalDataPoint(128, "White"));
barSeries.DataPoints.Add(new CategoricalDataPoint(143, "Smith"));
barSeries.DataPoints.Add(new CategoricalDataPoint(111, "Jones"));
barSeries.DataPoints.Add(new CategoricalDataPoint(118, "Marshall"));
this.radChartView1.Series.Add(barSeries);
BarSeries barSeries2 = new BarSeries("Performance", "RepresentativeName");
barSeries2.Name = "Q2";
barSeries2.DataPoints.Add(new CategoricalDataPoint(153, "Harley"));
barSeries2.DataPoints.Add(new CategoricalDataPoint(141, "White"));
barSeries2.DataPoints.Add(new CategoricalDataPoint(130, "Smith"));
barSeries2.DataPoints.Add(new CategoricalDataPoint(88, "Jones"));
barSeries2.DataPoints.Add(new CategoricalDataPoint(109, "Marshall"));
this.radChartView1.Series.Add(barSeries2);
CartesianGridLineAnnotation annotation1 = new CartesianGridLineAnnotation();
annotation1.Axis = this.radChartView1.Axes[1] as CartesianAxis;
annotation1.Value = 175;
annotation1.Label = "My label";
annotation1.BorderColor = Color.Red;
annotation1.BorderDashStyle = DashStyle.Solid;
annotation1.BorderWidth = 5;
this.radChartView1.Annotations.Add(annotation1);
this.radChartView1.MouseDown += radChartView1_MouseDown;
}
private void radChartView1_MouseDown(object sender, MouseEventArgs e)
{
Point pt = this.radChartView1.ChartElement.Wrapper.PointFromControl(e.Location);
object val = GetVerticalAxisValueFromMouse(e);
CartesianGridLineAnnotation annotation1 = this.radChartView1.Annotations[0] as CartesianGridLineAnnotation;
if (annotation1 != null)
{
int annotationValue = (int)annotation1.Value;
double delta = 1;
Console.WriteLine(val);
if (annotationValue==(double)val || annotationValue <= (double)val + delta && annotationValue >= (double)val - delta)
{
RadMessageBox.Show("Annotation is clicked");
}
}
}
private object GetVerticalAxisValueFromMouse(MouseEventArgs e)
{
LinearAxis axis = radChartView1.Axes[1] as LinearAxis;
IChartView view = (IChartView)axis.View;
double delta = axis.ActualRange.Maximum - axis.ActualRange.Minimum;
double totalHeight = axis.Model.LayoutSlot.Height;
double ratio = 1 - (e.Location.Y - this.radChartView1.Area.View.Viewport.Y - view.PlotOriginY - axis.Model.LayoutSlot.Y) / (totalHeight * view.ZoomHeight);
double value = axis.ActualRange.Minimum + delta * ratio;
return value;
}
Note that this is just a sample approach and it may not cover all possible cases. Feel free to modify it in a way which suits your requirement best.
I hope this information helps. If you have any additional questions, please let me know.
Regards,
Dess
Progress Telerik