Question

我正在使用System.Windows.Forms.DataVisualization.Charting.Chart在我的应用程序中绘制图表并将其作为图像导出，以便在其他地方使用。

我能够计算并显示直方图的结果。我面临的问题是我还需要显示它在列上方发生的百分比。

我考虑使用堆叠列来实现此效果，方法是让百分比显示为原始列上方的值。但是，它会出现在侧面，所以我不确定我做错了什么。

以下是我当前实现的代码片段：

RecomputeHistogramValues();

DateTime startRange = profile.GetStartDate();
DateTime endRange = profile.GetEndDate();

Int32 length = m_lHistogramBins.Count;

Int32 width = (Int32)(7.3 * 300); // 300 dpi.
Int32 height = (Int32)(3.5 * 300); // 300 dpi

Chart chart = new Chart
{
    Size = new Size(width, height)
};

ChartArea chartArea = new ChartArea();
chartArea.AxisX.MajorGrid.Enabled = false;
chartArea.AxisY.MajorGrid.LineColor = Color.LightGray;
chartArea.AxisX.LabelAutoFitStyle = LabelAutoFitStyles.None;
chartArea.AxisX.LabelStyle.Font = new Font("Calibri", 36);
chartArea.AxisX.LabelStyle.Angle = 0;
chartArea.AxisY.LabelAutoFitStyle = LabelAutoFitStyles.None;
chartArea.AxisY.LabelStyle.Font = new Font("Calibri", 36);
chartArea.AxisX.TitleFont = new Font("Calibri", 36);
chartArea.AxisX.Title = "Load";
chartArea.AxisX.TextOrientation = TextOrientation.Horizontal;
chartArea.AxisY.TitleFont = new Font("Calibri", 36);
chartArea.AxisY.Title = "Occurrences";
chartArea.AxisY.TextOrientation = TextOrientation.Rotated270;
chartArea.AxisX2.Enabled = AxisEnabled.False;
chartArea.AxisY2.Enabled = AxisEnabled.False;
chart.ChartAreas.Add(chartArea);
SeriesCollection seriesCollection = chart.Series;

// Generation of series
Series series = new Series
{
    ChartType = SeriesChartType.StackedColumn,
    XValueType = ChartValueType.String,
    YValueType = ChartValueType.Int32,
    Color = s_iSeries1Argb
};

Series percentages = new Series
{
    ChartType = SeriesChartType.StackedColumn,
    XValueType = ChartValueType.String,
    YValueType = ChartValueType.Double,
    Color = Color.Transparent
};

for (Int32 i = 0; i < length; ++i)
{
    if (i < length - 1)
    {
        String label = m_lHistogramBins[i].ToString();
        Double datapoint = Convert.ToDouble(m_hFrequency[m_lHistogramBins[i]]);

        series.Points.AddXY(label, datapoint);
        percentages.Points.AddXY(label, datapoint / m_iTotalFrequency);
    }
    else
    {
        String label = String.Format(">{0}", m_lHistogramBins[i - 1]);
        Double datapoint = Convert.ToDouble(m_hFrequency[m_lHistogramBins[i]]);

        series.Points.AddXY(label, datapoint);
        percentages.Points.AddXY(label, datapoint / m_iTotalFrequency);
    }
}
percentages.IsValueShownAsLabel = true;
percentages.LabelFormat = "P1";
percentages.YAxisType = AxisType.Secondary;
percentages.Enabled = true;
percentages.Font = new Font("Calibri", 36);

seriesCollection.Add(series);
seriesCollection.Add(percentages);

Title title = new Title
{
    Text = String.Format("Histogram: {0} - {1}", startRange.ToShortDateString(), endRange.ToShortDateString()),
    Font = new Font("Calibri", 48, FontStyle.Bold)
};
chart.Titles.Add(title);

chart.Invalidate();

chart.SaveImage(m_sChartFilename, ChartImageFormat.Png);

非常感谢任何建议。

如何在图表中的列顶部显示百分比

0 个答案: