Good Afternoon,

I was wondering if it is possible to handle click events on individual data points?

My main goal is to be able to click on a datapoint and for it to print it's X and Y values, along with the name of the object it belongs to. For example, if I have two classes, fruit and vegetables, in which the instances of those classes are apple, banana and carrot. When clicking the data point I would like a print out of the name of the instance containing its x and y values, along with the instance name, such as carrot and then the class that derived from (vegatable).

So basically I am aiming for such a printout when the data point is clicked:
Type of food: Vegetable
Food name: Carrot
X: 6
Y: 12

Sorry fruit and vegetables was the first thing that popped in my head, perhaps I should have used car manufaturer and model or the like.

Any help would be greatly appreciated.

Thankyou in advance,

David

Hi David,

Fruits and vegetables are fine - actually there are many examples in the control that use them...

 

You have to intercept the click event of the control and then perform a hit test. The following code snippet shows how to do this:

 

private void Form1_Load(object sender, EventArgs e)

{

    NChart chart = nChartControl1.Charts[0];

    chart.BoundsMode = BoundsMode.Stretch;

    // add some sample data

    NBarSeries apples = new NBarSeries();

    NBarSeries oranges = new NBarSeries();

    Random rand = new Random();

    for (int i = 0; i < 10; i++)

    {

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

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

    }

    apples.MultiBarMode = MultiBarMode.Clustered;

    oranges.MultiBarMode = MultiBarMode.Clustered;

    chart.Series.Add(apples);

    chart.Series.Add(oranges);

    nChartControl1.Refresh();

}

private void nChartControl1_MouseClick(object sender, MouseEventArgs e)

{

    NHitTestResult result = nChartControl1.HitTest(e.X, e.Y);

    if (result.ChartElement == ChartElement.DataPoint)

    {

        NBarSeries bar = (NBarSeries)result.Series;

        MessageBox.Show(bar.Values[result.DataPointIndex].ToString());

    }

}

Hope this helps - let me know if you meet any problems or have any questions.

 

Bob