是的,您可以这样做:
这是我采取的步骤:
首先我们禁用原始的Legend,因为它不能按照我们需要的方式进行操作..:
chart1.Legends[0].Enabled = false;
现在我们创建一个新的和一个对其的快捷方式引用:
chart1.Legends.Add(new Legend("customLegend"));
Legend L = chart1.Legends[1];
接下来我们做一些定位:
L.DockedToChartArea = chart1.ChartAreas[0].Name; // the ca it refers to
L.Docking = Docking.Bottom;
L.IsDockedInsideChartArea = false;
L.Alignment = StringAlignment.Center;
现在我们要为标题填写一行,每个系列填写一行。
我对两者都使用一个通用函数,并传入一个标志来指示是否应填写标题(x 值)或单元格数据(y 值)。这是我调用函数的方式:
addValuesToLegend(L, chart1.Series[0], false);
foreach (Series s in chart1.Series) addValuesToLegend(L, s, true);
请注意,要使其正常工作,我们需要在 Series 中进行一些准备工作:
- 我们需要明确地设置
Series.Colors,否则我们无法引用它们。
- 我已在每个系列的
Tag 中添加了格式字符串;但也许你会找到一个更好的解决方案,避免对标题格式进行硬编码..
所以这是完成所有填充和一些样式的函数:
void addValuesToLegend(Legend L, Series S, bool addYValues)
{
// create a new row for the legend
LegendItem newItem = new LegendItem();
// if the series has a markerstyle we show it:
newItem.MarkerStyle = S.MarkerStyle ;
newItem.MarkerColor = S.Color;
newItem.MarkerSize *= 2; // bump up the size
if (S.MarkerStyle == MarkerStyle.None)
{
// no markerstyle so we just show a colored rectangle
// you could add code to show a line for other chart types..
newItem.ImageStyle = LegendImageStyle.Rectangle;
newItem.BorderColor = Color.Transparent;
newItem.Color = S.Color;
}
else newItem.ImageStyle = LegendImageStyle.Marker;
// the rowheader shows the marker or the series color
newItem.Cells.Add(LegendCellType.SeriesSymbol, "", ContentAlignment.MiddleCenter);
// add series name
newItem.Cells.Add(LegendCellType.Text, addYValues ? S.Name : "",
ContentAlignment.MiddleLeft);
// combine the 1st two cells:
newItem.Cells[1].CellSpan = 2;
// we hide the first cell of the header row
if (!addYValues)
{
newItem.ImageStyle = LegendImageStyle.Line;
newItem.Color = Color.Transparent;
newItem.Cells[0].Tag = "*"; // we mark the 1st cell for not painting it
}
// now we loop over the points:
foreach (DataPoint dp in S.Points)
{
// we format the y-value
string t = dp.YValues[0].ToString(S.Tag.ToString());
// or maybe the x-value. it is a datatime so we need to convert it!
// note the escaping to work around my european locale!
if (!addYValues) t = DateTime.FromOADate(dp.XValue).ToString("M\\/d\\/yyyy");
newItem.Cells.Add(LegendCellType.Text, t, ContentAlignment.MiddleCenter);
}
// we can create some white space around the data:
foreach (var cell in newItem.Cells) cell.Margins = new Margins(25, 20, 25, 20);
// finally add the row of cells:
L.CustomItems.Add(newItem);
}
要在图例表的单元格周围绘制边框,我们需要编写 PrePaint 事件:
private void chart1_PrePaint(object sender, ChartPaintEventArgs e)
{
LegendCell cell = e.ChartElement as LegendCell;
if (cell != null && cell.Tag == null)
{
RectangleF r = e.ChartGraphics.GetAbsoluteRectangle(e.Position.ToRectangleF());
e.ChartGraphics.Graphics.DrawRectangle(Pens.DimGray,Rectangle.Round(r));
// Let's hide the left border when there is a cell span!
if (cell.CellSpan != 1)
e.ChartGraphics.Graphics.DrawLine(Pens.White,
r.Left, r.Top+1, r.Left, r.Bottom-1);
}
}
您可以添加更多样式,但我不确定您是否可以完美匹配示例..