如何以编程方式使用EPPlus更改Excel饼图的默认颜色。
下面是我的代码
var pieChart = worksheet.Drawings.AddChart("piechart", eChartType.Pie3D) as ExcelPieChart;
//Set top left corner to row 1 column 2
pieChart.SetPosition(18, 0, 0, 0);
pieChart.SetSize(350, 300);
pieChart.Series.Add(ExcelRange.GetAddress(12, 2, 15, 2),ExcelRange.GetAddress(12, 1, 15, 1) );
pieChart.Legend.Position = eLegendPosition.Bottom;
pieChart.Legend.Border.Fill.Color = Color.Green;
pieChart.Legend.Border.LineStyle = eLineStyle.Solid;
pieChart.Legend.Border.Fill.Style = eFillStyle.SolidFill;
pieChart.Title.Text = "Current Status";
pieChart.DataLabel.ShowCategory = false;
pieChart.DataLabel.ShowPercent = true;
我想将默认颜色更改为一些鲜艳的颜色。
建议并对此有所了解。
答案 0 :(得分:8)
受Ernie的回答启发,这里有一个扩展方法,用于设置折线图系列的颜色和厚度,以及未测试的版本,用于设置饼图数据点的颜色:
public static void SetSeriesStyle(this ExcelLineChart chart, ExcelChartSerie series, Color color, decimal? thickness = null) {
if (thickness < 0) throw new ArgumentOutOfRangeException("thickness");
var i = 0;
var found = false;
foreach (var s in chart.Series) {
if (s == series) {
found = true;
break;
}
++i;
}
if (!found) throw new InvalidOperationException("series not found.");
//Get the nodes
var nsm = chart.WorkSheet.Drawings.NameSpaceManager;
var nschart = nsm.LookupNamespace("c");
var nsa = nsm.LookupNamespace("a");
var node = chart.ChartXml.SelectSingleNode(@"c:chartSpace/c:chart/c:plotArea/c:lineChart/c:ser[c:idx[@val='" + i.ToString(CultureInfo.InvariantCulture) + "']]", nsm);
var doc = chart.ChartXml;
//Add the solid fill node
var spPr = doc.CreateElement("c:spPr", nschart);
var ln = spPr.AppendChild(doc.CreateElement("a:ln", nsa));
if (thickness.HasValue) {
var w = ln.Attributes.Append(doc.CreateAttribute("w"));
w.Value = Math.Round(thickness.Value * 12700).ToString(CultureInfo.InvariantCulture);
var cap = ln.Attributes.Append(doc.CreateAttribute("cap"));
cap.Value = "rnd";
}
var solidFill = ln.AppendChild(doc.CreateElement("a:solidFill", nsa));
var srgbClr = solidFill.AppendChild(doc.CreateElement("a:srgbClr", nsa));
var valattrib = srgbClr.Attributes.Append(doc.CreateAttribute("val"));
//Set the color
valattrib.Value = color.ToHex().Substring(1);
node.AppendChild(spPr);
}
public static void SetDataPointStyle(this ExcelPieChart chart, int dataPointIndex, Color color) {
//Get the nodes
var nsm = chart.WorkSheet.Drawings.NameSpaceManager;
var nschart = nsm.LookupNamespace("c");
var nsa = nsm.LookupNamespace("a");
var node = chart.ChartXml.SelectSingleNode("c:chartSpace/c:chart/c:plotArea/c:pieChart/c:ser", nsm);
var doc = chart.ChartXml;
//Add the node
//Create the data point node
var dPt = doc.CreateElement("c:dPt", nschart);
var idx = dPt.AppendChild(doc.CreateElement("c:idx", nschart));
var valattrib = idx.Attributes.Append(doc.CreateAttribute("val"));
valattrib.Value = dataPointIndex.ToString(CultureInfo.InvariantCulture);
node.AppendChild(dPt);
//Add the solid fill node
var spPr = doc.CreateElement("c:spPr", nschart);
var solidFill = spPr.AppendChild(doc.CreateElement("a:solidFill", nsa));
var srgbClr = solidFill.AppendChild(doc.CreateElement("a:srgbClr", nsa));
valattrib = srgbClr.Attributes.Append(doc.CreateAttribute("val"));
//Set the color
valattrib.Value = color.ToHex().Substring(1);
dPt.AppendChild(spPr);
}
public static String ToHex(this Color c) {
return "#" + c.R.ToString("X2") + c.G.ToString("X2") + c.B.ToString("X2");
}
用法:
lineChart.SetSeriesStyle(s, color: Color.FromArgb(0, 0, 0), thickness: 6m);
pieChart.SetDataPointStyle(dataPointIndex: 0, color: Color.FromArgb(0, 0, 0));
答案 1 :(得分:3)
我想当我遇到类似的问题时,我会稍微回馈一下。简短的回答是EEPlus不支持改变单个切片颜色的能力,因此我不得不依赖于xml操作。不漂亮,需要很好地了解您输出的数据 - 您需要知道您期望的切片数量。但它有效,这应该适用于除3D之外的其他饼图类型。
这是一个演示的测试方法。这是针对EPP 4.0.1的,但是应该与以前的版本一样好用:
[TestMethod]
public void Change_3DPieChart_Color()
{
const string PIE_PATH = "c:chartSpace/c:chart/c:plotArea/c:pie3DChart/c:ser";
var existingFile = new FileInfo(@"c:\temp\temp.xlsx");
if (existingFile.Exists)
existingFile.Delete();
using (var package = new ExcelPackage(existingFile))
{
var workbook = package.Workbook;
var worksheet = workbook.Worksheets.Add("newsheet");
//Some data
worksheet.Cells["A12"].Value = "wer";
worksheet.Cells["A13"].Value = "sdf";
worksheet.Cells["A14"].Value = "wer";
worksheet.Cells["A15"].Value = "ghgh";
worksheet.Cells["B12"].Value = 53;
worksheet.Cells["B13"].Value = 36;
worksheet.Cells["B14"].Value = 43;
worksheet.Cells["B15"].Value = 86;
//Create the pie
var pieChart = (ExcelPieChart) worksheet.Drawings.AddChart("piechart", eChartType.Pie3D);
//Set top left corner to row 1 column 2
pieChart.SetPosition(18, 0, 0, 0);
pieChart.SetSize(350, 300);
pieChart.Series.Add(ExcelCellBase.GetAddress(12, 2, 15, 2), ExcelCellBase.GetAddress(12, 1, 15, 1));
pieChart.Legend.Position = eLegendPosition.Bottom;
pieChart.Legend.Border.Fill.Color = Color.Green;
pieChart.Legend.Border.LineStyle = eLineStyle.Solid;
pieChart.Legend.Border.Fill.Style = eFillStyle.SolidFill;
pieChart.Title.Text = "Current Status";
pieChart.DataLabel.ShowCategory = false;
pieChart.DataLabel.ShowPercent = true;
//Get the nodes
var ws = pieChart.WorkSheet;
var nsm = ws.Drawings.NameSpaceManager;
var nschart = nsm.LookupNamespace("c");
var nsa = nsm.LookupNamespace("a");
var node = pieChart.ChartXml.SelectSingleNode(PIE_PATH, nsm);
var doc = pieChart.ChartXml;
//Add the node
var rand = new Random();
for (var i = 0; i < 4; i++)
{
//Create the data point node
var dPt = doc.CreateElement("dPt", nschart);
var idx = dPt.AppendChild(doc.CreateElement("idx", nschart));
var valattrib = idx.Attributes.Append(doc.CreateAttribute("val"));
valattrib.Value = i.ToString(CultureInfo.InvariantCulture);
node.AppendChild(dPt);
//Add the solid fill node
var spPr = doc.CreateElement("spPr", nschart);
var solidFill = spPr.AppendChild(doc.CreateElement("solidFill", nsa));
var srgbClr = solidFill.AppendChild(doc.CreateElement("srgbClr", nsa));
valattrib = srgbClr.Attributes.Append(doc.CreateAttribute("val"));
//Set the color
var color = Color.FromArgb(rand.Next(256), rand.Next(256), rand.Next(256));
valattrib.Value = ColorTranslator.ToHtml(color).Replace("#", String.Empty);
dPt.AppendChild(spPr);
}
package.Save();
}
}