Polar chartView SelectedPointChanged

[Alexey]

How to make it to catch ChartViewSelectedChanged event? Seems to work for other chart types such as cartesian or pie..

public Form1()
{
    InitializeComponent();

    radChartView1.Controllers.Add(new ChartSelectionController());
    radChartView1.SelectionMode = ChartSelectionMode.MultipleDataPoints;
    radChartView1.SelectedPointChanged += new ChartViewSelectedChangedEventHandler(OnChartSelectedPointChanged);
}

private void OnChartSelectedPointChanged(object sender, ChartViewSelectedPointChangedEventArgs e)
{
    PolarDataPoint pt = e.NewSelectedPoint as PolarDataPoint;
    if (pt == null) return;
    System.Diagnostics.Debug.WriteLine(" angle = " + pt.Angle + " value = " + pt.Value);
}

[Dimitar]

Hello Anton,

Thank you for writing.

It appears that there is an issue with the HitTest method in the series. I have logged the issue in our  Feedback Portal. I have added a vote for it on your behalf as well. You can track its progress, subscribe for status changes and add your comment to it here. I have also updated your Telerik Points.

To workaround this you need to create a custom renderer and draw part:

private void RadChartView1_CreateRenderer(object sender, ChartViewCreateRendererEventArgs e)
{
    e.Renderer = new MyPolarRenderer(e.Area as PolarArea);
}

class MyPolarRenderer : PolarRenderer
{
    public MyPolarRenderer(PolarArea area) : base(area)
    { }

    public override DataPoint HitTest(int x, int y)
    {
        for (int i = 0; i < this.DrawParts.Count; i++)
        {
            DataPoint dataPoint = this.DrawParts[i].HitTest(new Point(x, y));
            if (dataPoint != null)
            {
                return dataPoint;
            }
        }

        return base.HitTest(x, y);
    }
    protected override void Initialize()
    {
        base.Initialize();
        for (int i = 0; i < this.DrawParts.Count; i++)
        {
            PolarPointSeriesDrawPart linePart = this.DrawParts[i] as PolarPointSeriesDrawPart;
            if (linePart != null)
            {
                this.DrawParts[i] = new MyDrawpart((PolarPointSeries)linePart.Element, this);
            }
        }
    }

}
class MyDrawpart : PolarPointSeriesDrawPart
{
    public MyDrawpart(PolarPointSeries series, IChartRenderer renderer) : base(series, renderer)
    { }
    public override DataPoint HitTest(Point location)
    {
        if (this.Element.PointSize.Width == 0 || this.Element.PointSize.Height == 0)
        {
            return null;
        }

        for (int i = 0; i < this.Element.DataPoints.Count; i++)
        {
            RadRect slot = this.Element.DataPoints[i].LayoutSlot;
            float pointHalfWidth = this.Element.PointSize.Width / 2;
            float pointHalfHeight = this.Element.PointSize.Height / 2;

            RectangleF dataPointBounds = new RectangleF((float)(slot.X - pointHalfWidth), (float)(slot.Y - pointHalfHeight), this.Element.PointSize.Width, this.Element.PointSize.Height);

            if (dataPointBounds.Contains(location.X, location.Y))
            {
                return this.Element.DataPoints[i];
            }
        }

        return base.HitTest(location);
    }
}

Should you have any other questions do not hesitate to ask.

Regards,
Dimitar
Telerik by Progress