图表渲染
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创建图表
Aspose.Cells API支持创建各种Excel图表，详细内容请参阅创建和自定义Excel图表主题。 为了演示Aspose.Cells API在图像和PDF格式中渲染图表的用法，我们将根据以下片段创建柱状图。
Aspose::Cells::Startup();
// Output directory path
U16String outDir(u"..\\Data\\02_OutputDirectory\\");
// Create a new workbook
Workbook workbook;
// Get first worksheet which is created by default
Worksheet worksheet = workbook.GetWorksheets().Get(0);
// Adding sample values to cells
worksheet.GetCells().Get(u"A1").PutValue(50);
worksheet.GetCells().Get(u"A2").PutValue(100);
worksheet.GetCells().Get(u"A3").PutValue(150);
worksheet.GetCells().Get(u"B1").PutValue(4);
worksheet.GetCells().Get(u"B2").PutValue(20);
worksheet.GetCells().Get(u"B3").PutValue(50);
// Adding a chart to the worksheet
int chartIndex = worksheet.GetCharts().Add(Aspose::Cells::Charts::ChartType::Column, 5, 0, 20, 8);
// Accessing the instance of the newly added chart
Chart chart = worksheet.GetCharts().Get(chartIndex);
// Adding SeriesCollection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.GetNSeries().Add(u"A1:B3", true);
// Path of output image file
U16String outputChartImage = outDir + u"out1image.png";
chart.ToImage(outputChartImage, ImageType::Png);
// Path of output pdf file
U16String outputPdfFile = outDir + u"out1pdf.pdf";
// Saving chart to PDF
chart.ToPdf(outputPdfFile);
Aspose::Cells::Cleanup();
渲染图表
Aspose.Cells API支持将Excel图表转换为图像和PDF格式，而无需任何额外的工具或应用程序。为了提供渲染支持，Chart类公开了ToImage和ToPdf方法，具有各种重载以最好地满足应用程序需求。
将图表渲染为图像
Chart.toImage方法有多种重载，支持简单和高级渲染。如果应用程序的要求是在默认尺寸中呈现图表，则建议您使用Chart.toImage方法如下。
// Path of output image file
U16String outputChartImage = outDir + u"out1image.png";
// Saving the chart to image file
chart.ToImage(outputChartImage, ImageType::Png);
将图表渲染为PDF
为了将图表渲染为PDF格式，Aspose.Cells API公开了具有存储生成的PDF的路径或流的能力的Chart.ToPdf方法。
// Path of output pdf file
U16String outputPdfFile = outDir + u"out1pdf.pdf";
// Saving chart to PDF
chart.ToPdf(outputPdfFile);
支持的图表类型的渲染
目前有一些不支持渲染的图表类型。这些图表类型在下表的Supported列中包含N。
| 图表类型 | 图表子类型 | 支持 |
|---|---|---|
| Column | Column | Y |
| ColumnStacked | Y | |
| Column100PercentStacked | Y | |
| Column3DClustered | Y | |
| Column3DStacked | Y | |
| Column3D100PercentStacked | Y | |
| Column3D | Y | |
| Bar | Bar | Y |
| BarStacked | Y | |
| Bar100PercentStacked | Y | |
| Bar3DClustered | Y | |
| Bar3DStacked | Y | |
| Bar3D100PercentStacked | Y | |
| Line | Line | Y |
| LineStacked | Y | |
| Line100PercentStacked | Y | |
| LineWithDataMarkers | Y | |
| LineStackedWithDataMarkers | Y | |
| Line100PercentStackedWithDataMarkers | Y | |
| Line3D | Y | |
| Pie | Pie | Y |
| Pie3D | Y | |
| PiePie | Y | |
| PieExploded | Y | |
| Pie3DExploded | Y | |
| PieBar | Y | |
| Scatter | Scatter | Y |
| ScatterConnectedByCurvesWithDataMarker | Y | |
| ScatterConnectedByCurvesWithoutDataMarker | Y | |
| ScatterConnectedByLinesWithDataMarker | Y | |
| ScatterConnectedByLinesWithoutDataMarker | Y | |
| Area | Area | Y |
| AreaStacked | Y | |
| Area100PercentStacked | Y | |
| Area3D | Y | |
| Area3DStacked | Y | |
| Area3D100PercentStacked | Y | |
| Doughnut | Doughnut | Y |
| DoughnutExploded | Y | |
| Radar | Radar | Y |
| RadarWithDataMarkers | Y | |
| RadarFilled | Y | |
| Surface | Surface3D | N |
| SurfaceWireframe3D | N | |
| SurfaceContour | N | |
| SurfaceContourWireframe | N | |
| Bubble | Bubble | Y |
| Bubble3D | N | |
| Stock | StockHighLowClose | Y |
| StockOpenHighLowClose | Y | |
| StockVolumeHighLowClose | Y | |
| StockVolumeOpenHighLowClose | Y | |
| Cylinder | Cylinder | Y |
| CylinderStacked | Y | |
| Cylinder100PercentStacked | Y | |
| CylindricalBar | Y | |
| CylindricalBarStacked | Y | |
| CylindricalBar100PercentStacked | Y | |
| CylindricalColumn3D | Y | |
| Cone | Cone | Y |
| ConeStacked | Y | |
| Cone100PercentStacked | Y | |
| ConicalBar | Y | |
| ConicalBarStacked | Y | |
| ConicalBar100PercentStacked | Y | |
| ConicalColumn3D | Y | |
| Pyramid | Pyramid | Y |
| PyramidStacked | Y | |
| Pyramid100PercentStacked | Y | |
| PyramidBar | Y | |
| PyramidBarStacked | Y | |
| PyramidBar100PercentStacked | Y | |
| PyramidColumn3D | Y | |
| BoxWhisker | BoxWhisker | Y |
| Funnel | Funnel | Y |
| ParetoLine | ParetoLine | Y |
| Sunburst | Sunburst | Y |
| Treemap | Treemap | Y |
| Waterfall | Waterfall | Y |
| Histogram | Histogram | Y |
| Map | Map | N |
如果尝试将不受支持的图表类型渲染为图像或PDF，则可能会得到大小为0的图像或空白PDF。