创建瀑布图

瀑布图是一种特殊类型的图表，通常用于展示起始位置如何增加或减少。 Microsoft Excel 有许多预定义的图表类型，包括柱形图、折线图、饼图、条形图、雷达图等，但瀑布图超出了基本图形的范围，可以使用现有的图表类型创建，只需很少或更多的自定义。

Aspose.Cells API 允许在折线图的帮助下创建瀑布图。 API 还允许自定义图表外观，通过设置系列.UpBars & 系列.DownBars特性。

下面提供的代码片段演示了如何使用 Aspose.Cells for .NET API 从头开始创建瀑布图。

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

// Create an instance of Workbook
Workbook workbook = new Workbook();

// Retrieve the first Worksheet in Workbook
Worksheet worksheet = workbook.Worksheets[0];

// Retrieve the Cells of the first Worksheet
var cells = worksheet.Cells;

// Input some data which chart will use as source
cells["A1"].PutValue("Previous Year");
cells["A2"].PutValue("January");
cells["A3"].PutValue("March");
cells["A4"].PutValue("August");
cells["A5"].PutValue("October");
cells["A6"].PutValue("Current Year");

cells["B1"].PutValue(8.5);
cells["B2"].PutValue(1.5);
cells["B3"].PutValue(7.5);
cells["B4"].PutValue(7.5);
cells["B5"].PutValue(8.5);
cells["B6"].PutValue(3.5);

cells["C1"].PutValue(1.5);
cells["C2"].PutValue(4.5);
cells["C3"].PutValue(3.5);
cells["C4"].PutValue(9.5);
cells["C5"].PutValue(7.5);
cells["C6"].PutValue(9.5);

// Add a Chart of type Waterfall in same worksheet as of data
int idx = worksheet.Charts.Add(ChartType.Waterfall, 4, 4, 25, 13);
            
// Retrieve the Chart object
Chart chart = worksheet.Charts[idx];

// Add Series
chart.NSeries.Add("$B$1:$C$6", true);

// Add Category Data
chart.NSeries.CategoryData = "$A$1:$A$6";

// Series has Up Down Bars
chart.NSeries[0].HasUpDownBars = true;

// Set the colors of Up and Down Bars
chart.NSeries[0].UpBars.Area.ForegroundColor = Color.Green;
chart.NSeries[0].DownBars.Area.ForegroundColor = Color.Red;

// Make both Series Lines invisible
chart.NSeries[0].Border.IsVisible = false;
chart.NSeries[1].Border.IsVisible = false;

// Set the Plot Area Formatting Automatic
chart.PlotArea.Area.Formatting = FormattingType.Automatic;

// Delete the Legend
chart.Legend.LegendEntries[0].IsDeleted = true;
chart.Legend.LegendEntries[1].IsDeleted = true;

// Save the workbook
workbook.Save(dataDir + "output_out.xlsx");

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