Graphique vers image

Rendu des graphiques

Les API Aspose.Cells prennent en charge la conversion des graphiques Excel vers des formats d’images sans nécessiter d’outils ou d’applications supplémentaires. Afin de fournir un support de rendu, la classe Chart a exposé ToImage méthodes avec une variété de surcharges pour mieux répondre aux exigences de l’application.

Rendu des graphiques en images

La méthode Chart.ToImage a une variété de surcharges pour prendre en charge un rendu simple ainsi qu’avancé. Si l’exigence de l’application est de rendre le graphique dans ses dimensions par défaut, nous vous suggérons d’utiliser la méthode Chart.ToImage comme suit.

// 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);
// Instantiating a Workbook object
Workbook workbook = new Workbook();
// Adding a new worksheet to the Workbook
int sheetIndex = workbook.Worksheets.Add();
// Obtaining the reference of the newly added worksheet by passing its index to WorksheetCollection
Worksheet worksheet = workbook.Worksheets[sheetIndex];
// Adding sample values to cells
worksheet.Cells["A1"].PutValue(50);
worksheet.Cells["A2"].PutValue(100);
worksheet.Cells["A3"].PutValue(150);
worksheet.Cells["B1"].PutValue(4);
worksheet.Cells["B2"].PutValue(20);
worksheet.Cells["B3"].PutValue(50);
// Adding a chart to the worksheet
int chartIndex = worksheet.Charts.Add(Aspose.Cells.Charts.ChartType.Column, 5, 0, 15, 5);
// Accessing the instance of the newly added chart
Aspose.Cells.Charts.Chart chart = worksheet.Charts[chartIndex];
// Adding Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.NSeries.Add("A1:B3", true);
// Converting chart to image
chart.ToImage(dataDir + "chartEMF_out.emf", ImageType.Emf);
// Converting chart to Bitmap
System.Drawing.Bitmap bitmap = chart.ToImage();
bitmap.Save(dataDir + "chartBMP_out.bmp", System.Drawing.Imaging.ImageFormat.Bmp);

Il est également possible de rendre les graphiques en images avec des paramètres avancés. Les API Aspose.Cells ont exposé une version de surcharge de la méthode Chart.ToImage pouvant accepter une instance de ImageOrPrintOptions, tout en permettant de spécifier des paramètres tels que la résolution, le mode lissage, le format d’image, etc.

// 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);
// Instantiating a Workbook object
Workbook workbook = new Workbook();
// Adding a new worksheet to the Workbook
int sheetIndex = workbook.Worksheets.Add();
// Obtaining the reference of the newly added worksheet by passing its index to WorksheetCollection
Worksheet worksheet = workbook.Worksheets[sheetIndex];
// Adding sample values to cells
worksheet.Cells["A1"].PutValue(50);
worksheet.Cells["A2"].PutValue(100);
worksheet.Cells["A3"].PutValue(150);
worksheet.Cells["B1"].PutValue(4);
worksheet.Cells["B2"].PutValue(20);
worksheet.Cells["B3"].PutValue(50);
// Adding a chart to the worksheet
int chartIndex = worksheet.Charts.Add(Aspose.Cells.Charts.ChartType.Column, 5, 0, 15, 5);
// Accessing the instance of the newly added chart
Aspose.Cells.Charts.Chart chart = worksheet.Charts[chartIndex];
// Adding Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.NSeries.Add("A1:B3", true);
// Create an instance of ImageOrPrintOptions and set a few properties
ImageOrPrintOptions options = new ImageOrPrintOptions()
{
VerticalResolution = 300,
HorizontalResolution = 300,
SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias
};
// Convert chart to image with additional settings
chart.ToImage(dataDir + "chartPNG_out.png", options);

Types de graphiques supportés pour le rendu

Il existe quelques types de graphiques qui ne sont actuellement pas pris en charge pour le rendu. Ces types de graphiques contiennent N dans la colonne Pris en charge du tableau ci-dessous.

Type de graphique Sous-type de graphique Pris en charge
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

Sujets avancés