Add Curve Object to PDF file

Add Curve object

A graph Curve is a connected union of projective lines, each line meeting three others in ordinary double points.

B├ęzier curves are widely used in computer graphics to model smooth curves. The curve is completely contained in the convex hull of its control points, the points may be graphically displayed and used to manipulate the curve intuitively. The entire curve is contained in the quadrilateral whose corners are the four given points (their convex hull).

In this article, we will investigate simply graph curves, and filled curves, that you can create in your PDF document.

Follow the steps below:

  1. Create Document instance

  2. Create Drawing object with certain dimensions

  3. Set Border for Drawing object

  4. Add Graph object to paragraphs collection of page

  5. Save our PDF file

void ExampleCurve() {

    // Create Document instance
    String _dataDir("C:\\Samples\\");
    // Create Document instance
    auto document = MakeObject<Document>();

    // Add page to pages collection of PDF file
    auto page = document->get_Pages()->Add();

    // Create Drawing object with certain dimensions
    auto graph = MakeObject<Aspose::Pdf::Drawing::Graph>(400, 200);
    
    // Set border for Drawing object
    auto borderInfo = MakeObject<BorderInfo>(BorderSide::All, Color::get_Green());
    graph->set_Border(borderInfo);

    auto curve1 = MakeObject<Aspose::Pdf::Drawing::Curve>(MakeArray<double> ({ 10, 10, 50, 60, 70, 10, 100, 120}));
    curve1->get_GraphInfo()->set_Color(Color::get_GreenYellow());
    graph->get_Shapes()->Add(curve1);

    // Add Graph object to paragraphs collection of page
    page->get_Paragraphs()->Add(graph);

    // Save PDF file
    document->Save(_dataDir + u"DrawingCurve1_out.pdf");
}

The following picture shows the result executed with our code snippet:

Drawing Curve

Create Filled Curve Object

This example shows how to add a Curve object that is filled with color.

void ExampleFilledCurve() {

    // Create Document instance
    String _dataDir("C:\\Samples\\");
    // Create Document instance
    auto document = MakeObject<Document>();

    // Add page to pages collection of PDF file
    auto page = document->get_Pages()->Add();

    // Create Drawing object with certain dimensions
    auto graph = MakeObject<Aspose::Pdf::Drawing::Graph>(400, 200);
    
    // Set border for Drawing object
    auto borderInfo = MakeObject<BorderInfo>(BorderSide::All, Color::get_Green());
    graph->set_Border(borderInfo);

    auto curve1 = MakeObject<Aspose::Pdf::Drawing::Curve>(MakeArray<double>({ 10, 10, 50, 60, 70, 10, 100, 120}));
    curve1->get_GraphInfo()->set_FillColor(Color::get_GreenYellow());
    graph->get_Shapes()->Add(curve1);

    // Add Graph object to paragraphs collection of page
    page->get_Paragraphs()->Add(graph);

    // Save PDF file
    document->Save(_dataDir + u"DrawingCurve2_out.pdf");
}

Look at the result of adding a filled Curve:

Filled Curve