Customizing Charts with C++
Creating Custom Charts
So far, when we’ve discussed charts, we’ve looked at standard charts that have their standard formatting settings. We only define the data source, set a few properties, and the chart is created with its default format settings. But Aspose.Cells APIs also support creating custom charts that allow developers to create charts with their own format settings.
Developers can create custom charts at run-time using Aspose.Cells.
A chart is composed of a data series. Each data series in Aspose.Cells is represented by a Series object whereas SeriesCollection object serves as a collection of Series objects. When creating a custom chart, developers have the freedom to use different types of charts for different data series (collected in the SeriesCollection object).
The example code below demonstrates how to create custom charts. In this example, we are going to use a column chart for the first data series and a line chart for the second series. The result is that we add a column chart, combined with a line chart, to the worksheet.
#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
int sheetIndex = workbook.GetWorksheets().Add();
// Obtain the reference of the newly added worksheet by passing its sheet index
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"A4").PutValue(110);
worksheet.GetCells().Get(u"B1").PutValue(260);
worksheet.GetCells().Get(u"B2").PutValue(12);
worksheet.GetCells().Get(u"B3").PutValue(50);
worksheet.GetCells().Get(u"B4").PutValue(100);
// 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 NSeries (chart data source) to the chart ranging from "A1" cell to "B4"
chart.GetNSeries().Add(u"A1:B4", true);
// Set the chart type of 2nd NSeries to display as line chart
chart.GetNSeries().Get(1).SetType(ChartType::Line);
// Save the Excel file
workbook.Save(outDir + u"output.xls");
std::cout << "Chart created successfully!" << std::endl;
Aspose::Cells::Cleanup();
}