I have a problem about the donut chart and the labels that are displayed ..
How do I organize and display labels that are not drawn due to the previously set space, so that they become visible? thank you, I hope someone finds a solution to this problem ..
1 Answer, 1 is accepted
Hello, Genda,
RadChartView’s SmartLabelsController uses strategies specific to different chart types to resolve label overlaps. The default available strategies are FourPositionsLabelsStrategy, EightPositionsLabelsStrategy, PieTwoLabelColumnsStrategy, VerticalAdjusmentLabelsStrategy. You can find below a sample code snippet demonstrating how to adjust some settings of the strategy:
public RadForm1()
{
InitializeComponent();
List<KeyValuePair<double, object>> data = new List<KeyValuePair<double, object>>();
data.Add(new KeyValuePair<double, object>(46, "Samsung"));
data.Add(new KeyValuePair<double, object>(43.5, "Apple"));
data.Add(new KeyValuePair<double, object>(19, "RIM"));
data.Add(new KeyValuePair<double, object>(15, "Huawei"));
data.Add(new KeyValuePair<double, object>(14, "Other"));
data.Add(new KeyValuePair<double, object>(12, "Siemens"));
data.Add(new KeyValuePair<double, object>(11.5, "Panasonic"));
data.Add(new KeyValuePair<double, object>(8, "Nokia"));
data.Add(new KeyValuePair<double, object>(6.5, "Sony"));
data.Add(new KeyValuePair<double, object>(3.5, "Fujitsu"));
data.Add(new KeyValuePair<double, object>(3, "HTC"));
data.Add(new KeyValuePair<double, object>(2, "Motorola"));
this.radChartView1.AreaType = ChartAreaType.Pie;
DonutSeries series = new DonutSeries();
foreach (KeyValuePair<double, object> dataItem in data)
{
PieDataPoint point = new PieDataPoint(dataItem.Key, dataItem.Value.ToString());
point.Label = dataItem.Value.ToString();
series.DataPoints.Add(point);
point = new PieDataPoint(dataItem.Key, dataItem.Value.ToString());
point.Label = dataItem.Value.ToString();
series.DataPoints.Add(point);
}
series.ShowLabels = true;
this.radChartView1.Series.Add(series);
series.DrawLinesToLabels = true;
SmartLabelsController controler = new SmartLabelsController();
PieTwoLabelColumnsStrategy strategy = new PieTwoLabelColumnsStrategy();
strategy.DistanceToLabel = -10;
strategy.DistanceBetweenLabels = -10;
controler.Strategy = strategy;
this.radChartView1.Controllers.Add(controler);
}I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik
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