Grafico in Immagine con C++
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Rendering di grafici
Le API di Aspose.Cells supportano la conversione di grafici di Excel in formati immagine senza richiedere strumenti o applicazioni aggiuntive. Per supportare il rendering, la classe Chart ha esposto metodi ToImage con varie sovraccariche per adattarsi meglio ai requisiti dell’applicazione.
Rendering di grafici in immagini
Il metodo Chart.ToImage ha diverse sovraccariche per supportare rendering semplici e avanzati. Se l’esigenza dell’applicazione è di rendere il grafico nelle sue dimensioni predefinite, ti suggeriamo di usare il metodo Chart.ToImage come segue.
#include <iostream>
#include <fstream>
#include "Aspose.Cells.h"
using namespace Aspose::Cells;
using namespace Aspose::Cells::Charts;
using namespace Aspose::Cells::Drawing;
int main()
{
Aspose::Cells::Startup();
// Source directory path
U16String srcDir(u"..\\Data\\01_SourceDirectory\\");
// Output directory path
U16String outDir(u"..\\Data\\02_OutputDirectory\\");
// Create a new workbook
Workbook workbook;
// Add a new worksheet to the workbook
int sheetIndex = workbook.GetWorksheets().Add();
// Obtain the reference of the newly added worksheet
Worksheet worksheet = workbook.GetWorksheets().Get(sheetIndex);
// Add 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);
// Add a chart to the worksheet
int chartIndex = worksheet.GetCharts().Add(ChartType::Column, 5, 0, 15, 5);
// Access the instance of the newly added chart
Chart chart = worksheet.GetCharts().Get(chartIndex);
// Add Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.GetNSeries().Add(u"A1:B3", true);
// Convert chart to image
chart.ToImage(outDir + u"chartEMF_out.emf", ImageType::Emf);
// Convert chart to Bitmap
chart.ToImage(outDir + u"chartBMP_out.bmp", ImageType::Bmp);
std::cout << "Chart converted to images successfully!" << std::endl;
Aspose::Cells::Cleanup();
}
È anche possibile rendere i grafici in immagini con impostazioni avanzate. Le API di Aspose.Cells hanno esposto una versione sovraccaricata del metodo Chart.ToImage che accetta un’istanza di ImageOrPrintOptions, consentendoti di specificare parametri come risoluzione, modalità di smoothing, formato dell’immagine e così via.
#include <iostream>
#include "Aspose.Cells.h"
using namespace Aspose::Cells;
using namespace Aspose::Cells::Charts;
int main()
{
Aspose::Cells::Startup();
// Source directory path
U16String srcDir(u"..\\Data\\01_SourceDirectory\\");
// Output directory path
U16String outDir(u"..\\Data\\02_OutputDirectory\\");
// Create a new workbook
Workbook workbook;
// Add a new worksheet to the workbook
int32_t sheetIndex = workbook.GetWorksheets().Add();
// Get the reference of the newly added worksheet
Worksheet worksheet = workbook.GetWorksheets().Get(sheetIndex);
// Add 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);
// Add a chart to the worksheet
int32_t chartIndex = worksheet.GetCharts().Add(ChartType::Column, 5, 0, 15, 5);
// Get the instance of the newly added chart
Chart chart = worksheet.GetCharts().Get(chartIndex);
// Add Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.GetNSeries().Add(u"A1:B3", true);
// Create an instance of ImageOrPrintOptions and set a few properties
ImageOrPrintOptions options;
options.SetVerticalResolution(300);
options.SetHorizontalResolution(300);
// Convert chart to image with additional settings
chart.ToImage(outDir + u"chartPNG_out.png", options);
std::cout << "Chart converted to image successfully!" << std::endl;
Aspose::Cells::Cleanup();
}
Tipi di grafico supportati per il rendering
Ci sono alcuni tipi di grafico attualmente non supportati per il rendering. Tali tipi di grafico contengono N nella colonna Supportato della tabella sottostante.
| Tipo grafico | Sottotipo grafico | Supportato |
|---|---|---|
| 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 |
Nel caso tu provi a rendere in immagini o PDF i tipi di grafico non supportati, potresti ottenere immagini di dimensione 0 o un PDF vuoto.