Drawing Rectangles with Text and Image Content with RadPdfProcessing

Environment

Version	Product	Author
2025.1.205	RadPdfProcessing	Yoan Karamanov

Description

This article shows how to draw rectangles with formatted text or image content with the FixedContentEditor in the PdfProcessing library.

This knowledge base article also answers the following questions:

• How can I draw a rectangle and style it using RadPdfProcessing?
• How to add centered text within a rectangle in a PDF document?
• How to insert an image and center it within a rectangle using RadPdfProcessing?

Solution

To draw a rectangle with a black stroke and a light blue background, add centered text, and insert a centered image within the rectangle using the RadPdfProcessing library, follow these steps:

1. Draw a rectangle by creating a Path with a RectangleGeometry, defining its dimensions, formatting it, and inserting it in the page.
2. Create a Block of text, format it, and draw it on top of the rectangle with the FixedContentEditor by specifying its Position.
3. Draw a second rectangle at a different position.
4. Create an image Block and draw it on top of the second rectangle with the FixedContentEditor while specifying its Position.
5. Export the RadFixedDocument to PDF.

RadFixedDocument radFixedDocument = new RadFixedDocument();
RadFixedPage radFixedPage = new RadFixedPage();

radFixedPage.Size = new Size(11 * 100, 8.5 * 100);
radFixedDocument.Pages.Add(radFixedPage);

FixedContentEditor fixedContentEditor = new FixedContentEditor(radFixedPage);

int rectangle1X = 400;
int rectangle1Y = 100;
double rectangle1Width = 100;
double rectangle1Height = 300;

int rectangle2X = 700;
int rectangle2Y = 100;
double rectangle2Width = 100;
double rectangle2Height = 300;

// Draw a rectangle
RectangleGeometry rectangleGeometry1 = new RectangleGeometry();
rectangleGeometry1.Rect = new Rect(rectangle1X, rectangle1Y, rectangle1Width, rectangle1Height);

Telerik.Windows.Documents.Fixed.Model.Graphics.Path rectangle1Path = new Telerik.Windows.Documents.Fixed.Model.Graphics.Path();
rectangle1Path.Geometry = rectangleGeometry1;
rectangle1Path.IsFilled = true;
rectangle1Path.IsStroked = true;
rectangle1Path.Fill = new RgbColor(173, 216, 230);
rectangle1Path.Stroke = RgbColors.Black;
rectangle1Path.StrokeThickness = 2;

radFixedPage.Content.Add(rectangle1Path);

// Add formatted text Block on top of the rectangle
Block textBlock = new Block();

textBlock.VerticalAlignment = Telerik.Windows.Documents.Fixed.Model.Editing.Flow.VerticalAlignment.Center;
textBlock.HorizontalAlignment = Telerik.Windows.Documents.Fixed.Model.Editing.Flow.HorizontalAlignment.Center;
textBlock.TextProperties.CharacterSpacing = 5;
textBlock.TextProperties.Font = FontsRepository.TimesBold;
textBlock.TextProperties.FontSize = Unit.PointToDip(12);

textBlock.InsertText("How will this text needs to see how this draws");

fixedContentEditor.Position.Translate(rectangle1X, rectangle1Y);
fixedContentEditor.DrawBlock(textBlock, new Size(rectangle1Width, rectangle1Height));

// Draw a second rectangle
RectangleGeometry rectangleGeometry2 = new RectangleGeometry();
rectangleGeometry2.Rect = new Rect(rectangle2X, rectangle2Y, rectangle2Width, rectangle2Height);

Telerik.Windows.Documents.Fixed.Model.Graphics.Path rectangle2Path = new Telerik.Windows.Documents.Fixed.Model.Graphics.Path();
rectangle2Path.Geometry = rectangleGeometry2;
rectangle2Path.IsFilled = true;
rectangle2Path.IsStroked = true;
rectangle2Path.Fill = new RgbColor(173, 216, 230);
rectangle2Path.Stroke = RgbColors.Black;
rectangle2Path.StrokeThickness = 2;

radFixedPage.Content.Add(rectangle2Path);

// Draw a block with an image on top of the second rectangle
Block imageBlock = new Block();

imageBlock.VerticalAlignment = Telerik.Windows.Documents.Fixed.Model.Editing.Flow.VerticalAlignment.Center;
imageBlock.HorizontalAlignment = Telerik.Windows.Documents.Fixed.Model.Editing.Flow.HorizontalAlignment.Center;

Image image = new Image();
string imageFilePath = "..\\..\\..\\image.png";
FileStream fileStream = new FileStream(imageFilePath, FileMode.Open);

imageBlock.InsertImage(fileStream);

fixedContentEditor.Position.Translate(rectangle2X, rectangle2Y);
fixedContentEditor.DrawBlock(imageBlock, new Size(rectangle2Width, rectangle2Height));

// Export To PDF
string pdfOutputPath = "output.pdf";
PdfFormatProvider PDFProvider = new PdfFormatProvider();
using (FileStream FS = File.OpenWrite(pdfOutputPath))
{
    PDFProvider.Export(radFixedDocument, FS);
}

var psi = new ProcessStartInfo()
{
    FileName = pdfOutputPath,
    UseShellExecute = true
};
Process.Start(psi);

- PdfProcessing Image