绘制列之间没有空格的列图

通过阅读代码,我可以在方法中看到 ,有以下代码行:

    double segmentWidth = coordinateRangeWidth * 0.8;

所以这是一个非常明确的“否”,您不能通过设置公共属性来改变列之间的间距。

我要尝试的解决方案是编写一个继承自 柱形图 ,和重写 更新的数据点 .

好的,我去工作了。如果有人感兴趣,我已经附上historogramseries类的完整代码。

public class HistogramSeries : ColumnSeries, ISeries
{
    protected override void UpdateDataPoint(DataPoint dataPoint)
    {
        // That set the height and width.
        base.UpdateDataPoint(dataPoint);
        // Now we override the part about setting the width
        object category = dataPoint.ActualIndependentValue;
        var coordinateRange = GetCategoryRange(category);
        double minimum = (double)coordinateRange.Minimum.Value;
        double maximum = (double)coordinateRange.Maximum.Value;
        double coordinateRangeWidth = (maximum - minimum);
        const int WIDTH_MULTIPLIER = 1; // Harcoded to 0.8 in the parent. Could make this a dependency property
        double segmentWidth = coordinateRangeWidth * WIDTH_MULTIPLIER;
        var columnSeries = SeriesHost.Series.OfType<ColumnSeries>().Where(series => series.ActualIndependentAxis == ActualIndependentAxis);
        int numberOfSeries = columnSeries.Count();
        double columnWidth = segmentWidth / numberOfSeries;
        int seriesIndex = columnSeries.IndexOf(this);
        double offset = seriesIndex * Math.Round(columnWidth) + coordinateRangeWidth * 0.1;
        double dataPointX = minimum + offset;
        double left = Math.Round(dataPointX);
        double width = Math.Round(columnWidth);
        Canvas.SetLeft(dataPoint, left);
        dataPoint.Width = width;
    }
    #region ISeries Members
    System.Collections.ObjectModel.ObservableCollection<object> ISeries.LegendItems
    {
        get { return base.LegendItems; }
    }
    #endregion
    #region IRequireSeriesHost Members
    ISeriesHost IRequireSeriesHost.SeriesHost
    {
        get { return base.SeriesHost;}
        set { base.SeriesHost = value; }
    }
    #endregion
}
// Copied from the DataVisualization library
// (It was an internal class)
static class MyEnumerableFunctions
{
    public static int IndexOf(this IEnumerable that, object value)
    {
        int index = 0;
        foreach (object item in that)
        {
            if (object.ReferenceEquals(value, item) || value.Equals(item))
            {
                return index;
            }
            index++;
        }
        return -1;
    }
}

Imports System.Windows.Controls.DataVisualization.Charting


Public Class HistogramSeries
    Inherits ColumnSeries

    Protected Overrides Sub UpdateDataPoint(dataPoint As DataPoint)
        MyBase.UpdateDataPoint(dataPoint)

    ' Now we override the part about setting the width
        Dim category As Object = dataPoint.ActualIndependentValue
        Dim coordinateRange = GetCategoryRange(category)
        Dim minimum As Double = CDbl(coordinateRange.Minimum.Value)
        Dim maximum As Double = CDbl(coordinateRange.Maximum.Value)
        Dim coordinateRangeWidth As Double = (maximum - minimum)
        Const WIDTH_MULTIPLIER As Integer = 1 ' Harcoded to 0.8 in the parent. Could make this a dependency property
        Dim segmentWidth As Double = coordinateRangeWidth * WIDTH_MULTIPLIER
        Dim columnS As System.Collections.Generic.IEnumerable(Of ColumnSeries) = SeriesHost.Series.OfType(Of ColumnSeries)().Where(Function(series) series.ActualIndependentAxis Is ActualIndependentAxis)
        Dim numberOfSeries As Integer = columnS.Count
        Dim columnWidth As Double = segmentWidth / numberOfSeries
        Dim seriesIndex As Integer = columnS.ToList.IndexOf(Me)
        Dim offset As Double = seriesIndex * Math.Round(columnWidth) + coordinateRangeWidth * 0.1
        Dim dataPointX As Double = minimum + offset
        Dim left As Double = Math.Round(dataPointX)
        Dim width As Double = Math.Round(columnWidth)
        Canvas.SetLeft(dataPoint, left)
        dataPoint.Width = width
    End Sub

End Class