/// <summary>
/// Extracts the points from collection.
/// </summary>
/// <param name="dataSource">The data source (can be <see langword="null"/>).</param>
/// <param name="xPath">The binding path for the x value.</param>
/// <param name="yPath">The binding path for the y value.</param>
/// <param name="xLabels">
/// The collection of text labels used for x values. Can be <see langword="null"/>. This
/// parameter is only relevant when one chart axis shows text labels and the data source
/// contains <see cref="String"/> values instead of <see cref="Double"/> values.
/// </param>
/// <param name="yLabels">
/// The collection of text labels used for y values. Can be <see langword="null"/>. This
/// parameter is only relevant when one chart axis shows text labels and the data source
/// contains <see cref="String"/> values instead of <see cref="Double"/> values.
/// </param>
/// <param name="culture">
/// The <see cref="CultureInfo"/> object that provides culture-specific formatting
/// information.
/// </param>
/// <returns>The chart data as a list of data points.</returns>
private static IList<DataPoint> ExtractPointsFromCollection(
IEnumerable dataSource, PropertyPath xPath, PropertyPath yPath, CultureInfo culture,
IList<TextLabel> xLabels, IList<TextLabel> yLabels)
{
var xValueExtractor = new DoubleValueExtractor
{
Collection = dataSource,
Culture = culture,
TextLabels = xLabels,
ValuePath = xPath,
};
var xValues = xValueExtractor.Extract();
var yValueExtractor = new DoubleValueExtractor
{
Collection = dataSource,
Culture = culture,
TextLabels = yLabels,
ValuePath = yPath,
};
var yValues = yValueExtractor.Extract();
Debug.Assert(xValues.Count == yValues.Count, "Number of x values in data source does not match the number of y values?!");
int index = 0;
var chartDataSource = new DataPointCollection();
foreach (var data in dataSource)
{
chartDataSource.Add(new DataPoint(xValues[index], yValues[index], data));
index++;
}
return chartDataSource;
}
public IList <DataPoint> ToChartDataSource()
{
if (XValues == null)
{
throw new InvalidOperationException("XValues is missing.");
}
if (YValues == null)
{
throw new InvalidOperationException("XValues is missing");
}
// Extract x values from XValues collection.
var xValueExtractor = new DoubleValueExtractor
{
Collection = XValues,
Culture = Culture,
ValuePath = XValuePath,
};
var xValues = xValueExtractor.Extract();
// Extract y values from YValues collection.
var yValueExtractor = new DoubleValueExtractor
{
Collection = YValues,
Culture = Culture,
ValuePath = YValuePath,
};
var yValues = yValueExtractor.Extract();
Debug.Assert(xValues.Count == yValues.Count, "Number of x values in data source does not match the number of y values?!");
var chartDataSource = new DataPointCollection();
int index = 0;
int numberOfDataPoints = Math.Min(xValues.Count, yValues.Count);
var xValuesEnumerator = XValues.GetEnumerator();
var yValuesEnumerator = YValues.GetEnumerator();
while (index < numberOfDataPoints)
{
xValuesEnumerator.MoveNext();
yValuesEnumerator.MoveNext();
var dataPoint = new DataPoint
{
X = xValues[index],
Y = yValues[index],
DataContext = new CompositeData(xValuesEnumerator.Current, yValuesEnumerator.Current)
};
chartDataSource.Add(dataPoint);
index++;
}
return(chartDataSource);
}
