Introduction

public static void ModifyPaths()
{
  Console.WriteLine( "=== MODIFY PATHS ===" );
  var filename = "DocumentWithPaths.pdf";
  var outputFileName = "ModifyPaths.pdf";
  var outputPath = PathsSample.PathsSampleOutputDirectory + outputFileName;

  // Load a PdfDocument.
  using( var pdfDoc = PdfDocument.Load( PathsSample.PathsSampleResourcesDirectory + filename ) )
  {
    // Gets the first Page.
    var page1 = pdfDoc.Pages.First();

    // Gets the first path from the first page.
    var blueRect = page1.Paths[ 0 ];

    // Modify the blueRect Pen Paint(to red), position(to 360,360) and size(to 100x100).
    blueRect.Pen = blueRect.Pen.SetPaint( new RGBPaint( Color.Red ) );
    blueRect.Bounds = new Rectangle( 360, 360, 100, 100 );

    var pinkRect = page1.Paths[ 1 ];
    // Modify the pinkRect Fill Brush(to Orange) and position(to 72,360).
    pinkRect.Brush = Brushes.Orange;
    pinkRect.Bounds = new Rectangle( 72, 360, pinkRect.Bounds.Width, pinkRect.Bounds.Height );

    // Saves the output document.
    pdfDoc.SaveAs( outputPath );
    Console.WriteLine( $"Info exported to path: {outputFileName}" );
  }
}