Chart Calculations

Calculate Actual Values of Chart Elements

Aspose.Slides for C++ provides a simple API for getting these properties. This will help you to calculate actual values of chart elements. The actual values include position of elements that implement IActualLayout interface (IActualLayout::get_ActualX(), IActualLayout::get_ActualY(), IActualLayout::get_ActualWidth(), IActualLayout::get_ActualHeight()) and actual axes values (IAxis::get_ActualMaxValue(), IAxis::get_ActualMinValue(), IAxis::get_ActualMajorUnit(), IAxis::get_ActualMinorUnit(), IAxis::get_ActualMajorUnitScale(), IAxis::get_ActualMinorUnitScale()).

auto pres = System::MakeObject<Presentation>(u"test.pptx");
    
auto chart = System::ExplicitCast<Chart>(pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::ClusteredColumn, 100.0f, 100.0f, 500.0f, 350.0f));
chart->ValidateChartLayout();

double x = chart->get_PlotArea()->get_ActualX();
double y = chart->get_PlotArea()->get_ActualY();
double w = chart->get_PlotArea()->get_ActualWidth();
double h = chart->get_PlotArea()->get_ActualHeight();

// Saving presentation
pres->Save(u"Result.pptx", SaveFormat::Pptx);

Calculate Actual Position of Parent Chart Elements

Aspose.Slides for C++ provides a simple API for getting these properties. Methods of IActualLayout provide information about actual position of parent chart element. It is necessary to call method IChart::ValidateChartLayout() previously to fill properties with actual values.

// Creating empty presentation
auto pres = System::MakeObject<Presentation>();

auto chart = System::ExplicitCast<Chart>(pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::ClusteredColumn, 100.0f, 100.0f, 500.0f, 350.0f));
chart->ValidateChartLayout();

double x = chart->get_PlotArea()->get_ActualX();
double y = chart->get_PlotArea()->get_ActualY();
double w = chart->get_PlotArea()->get_ActualWidth();
double h = chart->get_PlotArea()->get_ActualHeight();

Hide Information from Chart

This topic helps you to understand how to hide information from chart. Using Aspose.Slides for C++ you can hide Title, Vertical Axis, Horizontal Axis and Grid Lines from chart. Below code example shows how to use these properties.

// The path to the documents directory.
const String outPath = u"../out/HideInformationFromChart.pptx";
// Load the desired the presentation
SharedPtr<Presentation> pres = MakeObject<Presentation>();
SharedPtr<IChart> chart = pres->get_Slides()->idx_get(0)->get_Shapes()->AddChart(ChartType::LineWithMarkers, 140, 118, 320, 370);
//Hiding chart Title
chart->set_HasTitle(false);
///Hiding Values axis
chart->get_Axes()->get_VerticalAxis()->set_IsVisible(false);
//Category Axis visibility
chart->get_Axes()->get_HorizontalAxis()->set_IsVisible(false);
//Hiding Legend
chart->set_HasLegend(false);
//Hiding MajorGridLines
chart->get_Axes()->get_HorizontalAxis()->get_MajorGridLinesFormat()->get_Line()->get_FillFormat()->set_FillType(FillType::NoFill);
for (int i = 0; i < chart->get_ChartData()->get_Series()->get_Count(); i++)
{
chart->get_ChartData()->get_Series()->RemoveAt(i);
}
SharedPtr<IChartSeries> series = chart->get_ChartData()->get_Series()->idx_get(0);
series->get_Marker()->set_Symbol(MarkerStyleType::Circle);
series->get_Labels()->get_DefaultDataLabelFormat()->set_ShowValue(true);
series->get_Labels()->get_DefaultDataLabelFormat()->set_Position(LegendDataLabelPosition::Top);
series->get_Marker()->set_Size(15);
//Setting series line color
series->get_Format()->get_Line()->get_FillFormat()->set_FillType(FillType::Solid);
series->get_Format()->get_Line()->get_FillFormat()->get_SolidFillColor()->set_Color(Color::get_Magenta());
series->get_Format()->get_Line()->set_DashStyle(LineDashStyle::Solid);
//Write the PPTX to Disk
pres->Save(outPath, Aspose::Slides::Export::SaveFormat::Pptx);

Set Data Range for Chart

Aspose.Slides for C++ has provided the simplest API to set the data range for chart in an easiest way. To set the data range for chart:

  • Open an instance of Presentation class containing chart.
  • Obtain the reference of a slide by using its Index.
  • Traverse through all shapes to find desired chart.
  • Access the chart data and set the range.
  • Save the modified presentation as a PPTX file.

The code examples that follow how to update a chart.

For complete examples and data files, please go to https://github.com/aspose-slides/Aspose.Slides-for-C
// The path to the documents directory.
const String templatePath = u"../templates/ExistingChart.pptx";
const String outPath = u"../out/DataRange_out.pptx";
//Instantiate Presentation class that represents PPTX file
SharedPtr<Presentation> pres = MakeObject<Presentation>(templatePath);
//Access first slide
SharedPtr<ISlide> slide = pres->get_Slides()->idx_get(0);
// Add chart with default data
// SharedPtr<IChart> chart = DynamicCast<Aspose::Slides::Charts::IChart>(slide->get_Shapes()->idx_get(0));
auto chart = DynamicCast<Aspose::Slides::Charts::Chart>(slide->get_Shapes()->idx_get(0));
//Not working
//Set data range
// chart->get_ChartData()->SetRange("Sheet1!A1:B4");
// Write the presentation file to disk
pres->Save(outPath, Aspose::Slides::Export::SaveFormat::Pptx);