Working with Layers
3 Sep 2020 / 24 minutes to read
Layers, also known as Option Content refers to sections of content in a PDF document that can be selectively viewed or hidden by document authors or consumers. This capability is useful in items such as CAD drawings, layered artwork, maps, and multi-language documents.
Essential PDF provides support to create, add and merge the layers into PDF document.
Adding Layers in a PDF document
Essential PDF allows the users to create a layer in a PDF page using PdfPageLayer class. The below code snippet illustrates how to add the multiple layers in a new PDF document.
//Create PDF document.
PdfDocument document = new PdfDocument();
PdfPage page = document.Pages.Add();
//Add the first layer.
PdfPageLayer layer = page.Layers.Add("Layer1");
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw arc.
PdfPen pen = new PdfPen(System.Drawing.Color.Red, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page.
PdfPageLayer layer2 = page.Layers.Add("Layer2");
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
//Save the document.
document.Save("Sample.pdf");
//Close the document
document.Close(true);'Create PDF document.
Dim document As New PdfDocument()
Dim page As PdfPage = document.Pages.Add()
'Add the first layer.
Dim layer As PdfPageLayer = page.Layers.Add("Layer1")
Dim graphics As PdfGraphics = layer.Graphics
graphics.TranslateTransform(100, 60)
'Draw arc.
Dim pen As New PdfPen(System.Drawing.Color.Red, 50)
Dim bounds As New RectangleF(0, 0, 50, 50)
graphics.DrawArc(pen, bounds, 360, 360)
'Add another layer on the page.
Dim layer2 As PdfPageLayer = page.Layers.Add("Layer2")
graphics = layer2.Graphics
graphics.TranslateTransform(100, 180)
'Draw ellipse.
graphics.DrawEllipse(pen, bounds)
'Save the document.
document.Save("Sample.pdf")
'Close the document
document.Close(True)//Create PDF document.
PdfDocument document = new PdfDocument();
PdfPage page = document.Pages.Add();
//Add the first layer.
PdfPageLayer layer = page.Layers.Add("Layer1");
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw arc.
PdfPen pen = new PdfPen(new PdfColor(255, 0, 0), 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page.
PdfPageLayer layer2 = page.Layers.Add("Layer2");
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
MemoryStream memoryStream = new MemoryStream();
//Save the document.
await document.SaveAsync(memoryStream);
//Close the documents.
document.Close(true);
//Save the stream as PDF document file in local machine. Refer to PDF/UWP section for respected code samples.
Save(memoryStream, "Sample.pdf");//Create PDF document.
PdfDocument document = new PdfDocument();
PdfPage page = document.Pages.Add();
//Add the first layer.
PdfPageLayer layer = page.Layers.Add("Layer1");
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw arc.
PdfPen pen = new PdfPen(Syncfusion.Drawing.Color.Red, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page.
PdfPageLayer layer2 = page.Layers.Add("Layer2");
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
//Save and close the document
MemoryStream stream = new MemoryStream();
document.Save(stream);
stream.Position = 0;
//Close the document.
document.Close(true);
//Defining the ContentType for pdf file.
string contentType = "application/pdf";
//Define the file name.
string fileName = "Output.pdf";
//Creates a FileContentResult object by using the file contents, content type, and file name.
return File(stream, contentType, fileName);//Create PDF document.
PdfDocument document = new PdfDocument();
PdfPage page = document.Pages.Add();
//Add the first layer.
PdfPageLayer layer = page.Layers.Add("Layer1");
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw arc.
PdfPen pen = new PdfPen(Syncfusion.Drawing.Color.Red, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page.
PdfPageLayer layer2 = page.Layers.Add("Layer2");
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
//Save the document into stream.
MemoryStream stream = new MemoryStream();
document.Save(stream);
//Close the document.
document.Close(true);
//Save the stream into pdf file
//The operation in Save under Xamarin varies between Windows Phone, Android and iOS platforms. Please refer PDF/Xamarin section for respective code samples.
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
{
Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Sample.pdf", "application/pdf", stream);
}
else
{
Xamarin.Forms.DependencyService.Get<ISave>().Save("Sample.pdf", "application/pdf", stream);
}The below code illustrates how to add the multiple layers in an existing PDF document.
//Load the existing PDF document.
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(fileName);
PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
//Add the first layer.
PdfPageLayer layer = loadedPage.Layers.Add("Layer1");
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw arc.
PdfPen pen = new PdfPen(System.Drawing.Color.Gray, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page.
PdfPageLayer layer2 = loadedPage.Layers.Add("Layer2");
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
//Save the document.
loadedDocument.Save("Output.pdf");
//Close the document
loadedDocument.Close(true);'Load the existing PDF document.
Dim loadedDocument As New PdfLoadedDocument(fileName)
Dim loadedPage As PdfLoadedPage = TryCast(loadedDocument.Pages(0), PdfLoadedPage)
'Add the first layer.
Dim layer As PdfPageLayer = loadedPage.Layers.Add("Layer1")
Dim graphics As PdfGraphics = layer.Graphics
graphics.TranslateTransform(100, 60)
'Draw arc.
Dim pen As New PdfPen(System.Drawing.Color.Gray, 50)
Dim bounds As New RectangleF(0, 0, 50, 50)
graphics.DrawArc(pen, bounds, 360, 360)
'Add another layer on the page.
Dim layer2 As PdfPageLayer = loadedPage.Layers.Add("Layer2")
graphics = layer2.Graphics
graphics.TranslateTransform(100, 180)
'Draw ellipse.
graphics.DrawEllipse(pen, bounds)
'Save the document.
loadedDocument.Save("Output.pdf")
'Close the document
loadedDocument.Close(True)//Create the file open picker
var picker = new FileOpenPicker();
picker.FileTypeFilter.Add(".pdf");
//Browse and chose the file
StorageFile file = await picker.PickSingleFileAsync();
//Creates an empty PDF loaded document instance
PdfLoadedDocument loadedDocument = new PdfLoadedDocument();
//Loads or opens an existing PDF document through Open method of PdfLoadedDocument class
await loadedDocument.OpenAsync(file);
PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
//Add the first layer.
PdfPageLayer layer = loadedPage.Layers.Add("Layer1");
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw arc.
PdfPen pen = new PdfPen(new PdfColor(255, 0, 0), 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page.
PdfPageLayer layer2 = loadedPage.Layers.Add("Layer2");
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
MemoryStream memoryStream = new MemoryStream();
//Save the document.
await loadedDocument.SaveAsync(memoryStream);
//Close the documents.
loadedDocument.Close(true);
//Save the stream as PDF document file in local machine. Refer to PDF/UWP section for respected code samples.
Save(memoryStream, "Sample.pdf");//Load the PDF document
FileStream docStream = new FileStream("Input.pdf", FileMode.Open, FileAccess.Read);
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
//Add the first layer.
PdfPageLayer layer = loadedPage.Layers.Add("Layer1");
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw arc.
PdfPen pen = new PdfPen(Syncfusion.Drawing.Color.Gray, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page.
PdfPageLayer layer2 = loadedPage.Layers.Add("Layer2");
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
//Save and close the document
MemoryStream stream = new MemoryStream();
loadedDocument.Save(stream);
stream.Position = 0;
//Close the document.
loadedDocument.Close(true);
//Defining the ContentType for pdf file.
string contentType = "application/pdf";
//Define the file name.
string fileName = "Output.pdf";
//Creates a FileContentResult object by using the file contents, content type, and file name.
return File(stream, contentType, fileName);//Load the file as stream
Stream docStream = typeof(App).GetTypeInfo().Assembly.GetManifestResourceStream("Sample.Assets.Sample.pdf");
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
//Add the first layer.
PdfPageLayer layer = loadedPage.Layers.Add("Layer1");
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw arc.
PdfPen pen = new PdfPen(Syncfusion.Drawing.Color.Gray, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page.
PdfPageLayer layer2 = loadedPage.Layers.Add("Layer2");
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
//Save the document into stream.
MemoryStream stream = new MemoryStream();
loadedDocument.Save(stream);
//Close the document.
loadedDocument.Close(true);
//Save the stream into pdf file
//The operation in Save under Xamarin varies between Windows Phone, Android and iOS platforms. Please refer PDF/Xamarin section for respective code samples.
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
{
Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Sample.pdf", "application/pdf", stream);
}
else
{
Xamarin.Forms.DependencyService.Get<ISave>().Save("Sample.pdf", "application/pdf", stream);
}Adding annotation to layer
Essential PDF allows the users to add Annotation to layers in the PDF document. Refer to the following code snippet.
//Create new PDF document
PdfDocument document = new PdfDocument();
//Add page
PdfPage page = document.Pages.Add();
//Add the layer
PdfLayer layer = document.Layers.Add("Layer");
//Create graphics for layer
PdfGraphics graphics = layer.CreateGraphics(page);
//Draw ellipse
graphics.DrawEllipse(PdfPens.Red, new RectangleF(50, 50, 40, 40));
//Create square annotation
PdfSquareAnnotation annotation = new PdfSquareAnnotation(new RectangleF(200, 260, 50, 50), "Square annotation");
annotation.Color = new PdfColor(Color. Red);
//Set layer to annotation
annotation.Layer = layer;
//Add annotation to the created page
page.Annotations.Add(annotation);
//Save the document
document.Save("Output.pdf");
//Close the document
document.Close(true);'Create new PDF document
Dim document As New PdfDocument()
'Add page
Dim page As PdfPage = document.Pages.Add()
'Add the layer
Dim Layer As PdfLayer = document.Layers.Add("Layer")
'Create graphics for layer
Dim graphics As PdfGraphics = Layer.CreateGraphics(page)
'Draw ellipse
graphics.DrawEllipse(PdfPens.Red, New RectangleF(50, 50, 40, 40))
'Create square annotation
Dim annotation As New PdfSquareAnnotation(New RectangleF(200, 260, 50, 50), "Square annotation")
annotation.Color = New PdfColor(Color.Red)
'Set layer to annotation
annotation.Layer = Layer
'Add annotation to the created page
page.Annotations.Add(annotation)
'Save the document
document.Save("Output.pdf")
'Close the document
document.Close(True)//Create new PDF document
PdfDocument document = new PdfDocument();
//Add page
PdfPage page = document.Pages.Add();
//Add the layer
PdfLayer layer = document.Layers.Add("Layer");
//Create graphics for layer
PdfGraphics graphics = layer.CreateGraphics(page);
//Draw ellipse
graphics.DrawEllipse(PdfPens.Red, new RectangleF(50, 50, 40, 40));
//Create square annotation
PdfSquareAnnotation annotation = new PdfSquareAnnotation(new RectangleF(200, 260, 50, 50), "Square annotation");
annotation.Color = new PdfColor(Color.FromArgb(0,255,0,0));
//Set layer to annotation
annotation.Layer = layer;
//Add annotation to the created page
page.Annotations.Add(annotation);
MemoryStream memoryStream = new MemoryStream();
//Save the document.
await document.SaveAsync(memoryStream);
//Close the documents.
document.Close(true);
//Save the stream as PDF document file in local machine. Refer to PDF/UWP section for respected code samples.
Save(memoryStream, "Sample.pdf");//Create new PDF document
PdfDocument document = new PdfDocument();
//Add page
PdfPage page = document.Pages.Add();
//Add the layer
PdfLayer layer = document.Layers.Add("Layer");
//Create graphics for layer
PdfGraphics graphics = layer.CreateGraphics(page);
//Draw ellipse
graphics.DrawEllipse(PdfPens.Red, new RectangleF(50, 50, 40, 40));
//Create square annotation
PdfSquareAnnotation annotation = new PdfSquareAnnotation(new RectangleF(200, 260, 50, 50), "Square annotation");
annotation.Color = new PdfColor(Syncfusion.Drawing.Color.Red);
//Set layer to annotation
annotation.Layer = layer;
//Add annotation to the created page
page.Annotations.Add(annotation);
//Save and close the document
MemoryStream stream = new MemoryStream();
document.Save(stream);
stream.Position = 0;
//Close the document.
document.Close(true);
//Defining the ContentType for pdf file.
string contentType = "application/pdf";
//Define the file name.
string fileName = "Output.pdf";
//Creates a FileContentResult object by using the file contents, content type, and file name.
return File(stream, contentType, fileName);//Create new PDF document
PdfDocument document = new PdfDocument();
//Add page
PdfPage page = document.Pages.Add();
//Add the layer
PdfLayer layer = document.Layers.Add("Layer");
//Create graphics for layer
PdfGraphics graphics = layer.CreateGraphics(page);
//Draw ellipse
graphics.DrawEllipse(PdfPens.Red, new RectangleF(50, 50, 40, 40));
//Create square annotation
PdfSquareAnnotation annotation = new PdfSquareAnnotation(new RectangleF(200, 260, 50, 50), "Square annotation");
annotation.Color = new PdfColor(Syncfusion.Drawing.Color.Red);
//Set layer to annotation
annotation.Layer = layer;
//Add annotation to the created page
page.Annotations.Add(annotation);
//Save the document into stream.
MemoryStream stream = new MemoryStream();
document.Save(stream);
//Close the document.
document.Close(true);
//Save the stream into pdf file
//The operation in Save under Xamarin varies between Windows Phone, Android and iOS platforms. Please refer PDF/Xamarin section for respective code samples.
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
{
Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Sample.pdf", "application/pdf", stream);
}
else
{
Xamarin.Forms.DependencyService.Get<ISave>().Save("Sample.pdf", "application/pdf", stream);
}The following code illustrates how to add annotation to the layers in an existing PDF document.
//Load the existing PDF document
PdfLoadedDocument loadedDocument = new PdfLoadedDocument("Input.pdf");
//Gets the first page from the document
PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
//Add the layer
PdfLayer Layer = loadedDocument.Layers.Add("Layer");
//Create graphics for layer
PdfGraphics graphics = Layer.CreateGraphics(loadedPage);
//Draw ellipse
graphics.DrawEllipse(PdfPens.Red, new RectangleF(50, 50, 40, 40));
//Create square annotation
PdfSquareAnnotation annotation = new PdfSquareAnnotation(new RectangleF(200, 260, 50, 50), "Square annotation");
annotation.Color = new PdfColor(Color.Red);
//Set layer to annotation
annotation.Layer = Layer;
//Add annotation to the created page
loadedPage.Annotations.Add(annotation);
//Save the document
loadedDocument.Save("Output.pdf");
//Close the document
loadedDocument.Close(true);'Load the existing PDF document
Dim loadedDocument As New PdfLoadedDocument("Input.pdf")
'Gets the first page from the document
Dim loadedPage As PdfLoadedPage = TryCast(loadedDocument.Pages(0), PdfLoadedPage)
'Add the layer
Dim Layer As PdfLayer = loadedDocument.Layers.Add("Layer")
'Create graphics for layer
Dim graphics As PdfGraphics = Layer.CreateGraphics(loadedPage)
'Draw ellipse
graphics.DrawEllipse(PdfPens.Red, New RectangleF(50, 50, 40, 40))
'Create square annotation
Dim annotation As New PdfSquareAnnotation(New RectangleF(200, 260, 50, 50), "Square annotation")
annotation.Color = New PdfColor(Color.Red)
'Set layer to annotation
annotation.Layer = Layer
'Add annotation to the created page
loadedPage.Annotations.Add(annotation)
'Save the document
loadedDocument.Save("Output.pdf")
'Close the document
loadedDocument.Close(True)//Create the file open picker
var picker = new FileOpenPicker();
picker.FileTypeFilter.Add(".pdf");
//Browse and chose the file
StorageFile file = await picker.PickSingleFileAsync();
//Creates an empty PDF loaded document instance
PdfLoadedDocument loadedDocument = new PdfLoadedDocument();
//Loads or opens an existing PDF document through Open method of PdfLoadedDocument class
await loadedDocument.OpenAsync(file);
//Gets the first page from the document
PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
//Add the layer
PdfLayer Layer = loadedDocument.Layers.Add("Layer");
//Create graphics for layer
PdfGraphics graphics = Layer.CreateGraphics(loadedPage);
//Draw ellipse
graphics.DrawEllipse(PdfPens.Red, new RectangleF(50, 50, 40, 40));
//Create square annotation
PdfSquareAnnotation annotation = new PdfSquareAnnotation(new RectangleF(200, 260, 50, 50), "Square annotation");
annotation.Color = new PdfColor(Color.FromArgb(0,255,0,0));
//Set layer to annotation
annotation.Layer = Layer;
//Add annotation to the created page
loadedPage.Annotations.Add(annotation);
MemoryStream memoryStream = new MemoryStream();
//Save the document.
await loadedDocument.SaveAsync(memoryStream);
//Close the documents.
loadedDocument.Close(true);
//Save the stream as PDF document file in local machine. Refer to PDF/UWP section for respected code samples.
Save(memoryStream, "Sample.pdf");//Load the PDF document
FileStream docStream = new FileStream("Input.pdf", FileMode.Open, FileAccess.Read);
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
//Gets the first page from the document
PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
//Add the layer
PdfLayer Layer = loadedDocument.Layers.Add("Layer");
//Create graphics for layer
PdfGraphics graphics = Layer.CreateGraphics(loadedPage);
//Draw ellipse
graphics.DrawEllipse(PdfPens.Red, new RectangleF(50, 50, 40, 40));
//Create square annotation
PdfSquareAnnotation annotation = new PdfSquareAnnotation(new RectangleF(200, 260, 50, 50), "Square annotation");
annotation.Color = new PdfColor(Syncfusion.Drawing.Color.Red);
//Set layer to annotation
annotation.Layer = Layer;
//Add annotation to the created page
loadedPage.Annotations.Add(annotation);
//Save and close the document
MemoryStream stream = new MemoryStream();
loadedDocument.Save(stream);
stream.Position = 0;
//Close the document.
loadedDocument.Close(true);
//Defining the ContentType for pdf file.
string contentType = "application/pdf";
//Define the file name.
string fileName = "Output.pdf";
//Creates a FileContentResult object by using the file contents, content type, and file name.
return File(stream, contentType, fileName);//Load the file as stream
Stream docStream = typeof(App).GetTypeInfo().Assembly.GetManifestResourceStream("Sample.Assets.Sample.pdf");
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
//Gets the first page from the document
PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
//Add the layer
PdfLayer Layer = loadedDocument.Layers.Add("Layer");
//Create graphics for layer
PdfGraphics graphics = Layer.CreateGraphics(loadedPage);
//Draw ellipse
graphics.DrawEllipse(PdfPens.Red, new RectangleF(50, 50, 40, 40));
//Create square annotation
PdfSquareAnnotation annotation = new PdfSquareAnnotation(new RectangleF(200, 260, 50, 50), "Square annotation");
annotation.Color = new PdfColor(Syncfusion.Drawing.Color.Red);
//Set layer to annotation
annotation.Layer = Layer;
//Add annotation to the created page
loadedPage.Annotations.Add(annotation);
//Save the document into stream.
MemoryStream stream = new MemoryStream();
loadedDocument.Save(stream);
//Close the document.
loadedDocument.Close(true);
//Save the stream into pdf file
//The operation in Save under Xamarin varies between Windows Phone, Android and iOS platforms. Please refer PDF/Xamarin section for respective code samples.
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
{
Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Sample.pdf", "application/pdf", stream);
}
else
{
Xamarin.Forms.DependencyService.Get<ISave>().Save("Sample.pdf", "application/pdf", stream);
}Nested Layers
Essential PDF allows users to add nested layers in the PDF document. Refer to the following code snippet.
//Create the PDF document
PdfDocument document = new PdfDocument();
PdfPage page = document.Pages.Add();
//Add the parent layer
PdfLayer layer = document.Layers.Add("Layer1");
PdfGraphics graphics = layer.CreateGraphics(page);
graphics.TranslateTransform(100, 60);
//Draw an arc
PdfPen pen = new PdfPen(Color.Red, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add the child layer
PdfLayer layer2 = layer.Layers.Add("Layer2");
graphics = layer2.CreateGraphics(page);
graphics.TranslateTransform(100, 180);
//Draw an ellipse
graphics.DrawEllipse(pen, bounds);
//Save the document
document.Save("Output.pdf");
//Close the document
document.Close(true);'Create the PDF document
Dim document As New PdfDocument()
Dim page As PdfPage = document.Pages.Add()
'Add the parent layer
Dim layer As PdfLayer = document.Layers.Add("Layer1")
Dim graphics As PdfGraphics = layer.CreateGraphics(page)
graphics.TranslateTransform(100, 60)
'Draw an arc
Dim pen As New PdfPen(Color.Red, 50)
Dim bounds As New RectangleF(0, 0, 50, 50)
graphics.DrawArc(pen, bounds, 360, 360)
'Add the child layer
Dim layer2 As PdfLayer = layer.Layers.Add("Layer2")
graphics = layer2.CreateGraphics(page)
graphics.TranslateTransform(100, 180)
'Draw an ellipse
graphics.DrawEllipse(pen, bounds)
'Save the document
document.Save("Output.pdf")
'Close the document
document.Close(True)//Create the PDF document
PdfDocument document = new PdfDocument();
PdfPage page = document.Pages.Add();
//Add the parent layer
PdfLayer layer = document.Layers.Add("Layer1");
PdfGraphics graphics = layer.CreateGraphics(page);
graphics.TranslateTransform(100, 60);
//Draw an arc
PdfPen pen = new PdfPen(new PdfColor(255,0,0), 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add the child layer
PdfLayer layer2 = layer.Layers.Add("Layer2");
graphics = layer2.CreateGraphics(page);
graphics.TranslateTransform(100, 180);
//Draw an ellipse
graphics.DrawEllipse(pen, bounds);
//Save the document as stream
MemoryStream stream = new MemoryStream();
await document.SaveAsync(stream);
//Close the document instances
document.Close(true);
//Save the stream as PDF document file in local machine. Refer to the PDF/UWP section for respective code samples
Save(stream, "Output.pdf");//Create the PDF document
PdfDocument document = new PdfDocument();
PdfPage page = document.Pages.Add();
//Add the parent layer
PdfLayer layer = document.Layers.Add("Layer1");
PdfGraphics graphics = layer.CreateGraphics(page);
graphics.TranslateTransform(100, 60);
//Draw an arc
PdfPen pen = new PdfPen(Color.Red, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add the child layer
PdfLayer layer2 = layer.Layers.Add("Layer2");
graphics = layer2.CreateGraphics(page);
graphics.TranslateTransform(100, 180);
//Draw an ellipse
graphics.DrawEllipse(pen, bounds);
//Creating the stream object
MemoryStream stream = new MemoryStream();
//Save the document as stream
document.Save(stream);
//If the position is not set to '0', the PDF will be empty
stream.Position = 0;
//Close the document
document.Close(true);
//Defining the ContentType for PDF file
string contentType = "application/pdf";
//Define the file name
string fileName = "Output.pdf";
//Creates a FileContentResult object by using the file contents, content type, and file name
return File(stream, contentType, fileName);//Create the PDF document
PdfDocument document = new PdfDocument();
PdfPage page = document.Pages.Add();
//Add the parent layer
PdfLayer layer = document.Layers.Add("Layer1");
PdfGraphics graphics = layer.CreateGraphics(page);
graphics.TranslateTransform(100, 60);
//Draw an arc
PdfPen pen = new PdfPen(Syncfusion.Drawing.Color.Red, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add the child layer
PdfLayer layer2 = layer.Layers.Add("Layer2");
graphics = layer2.CreateGraphics(page);
graphics.TranslateTransform(100, 180);
//Draw an ellipse
graphics.DrawEllipse(pen, bounds);
//Save the document as stream
MemoryStream stream = new MemoryStream();
document.Save(stream);
//Close the document instances
document.Close(true);
//Save the stream into PDF file
//The operation in Save under Xamarin varies between Windows Phone, Android, and iOS platforms. Refer to the PDF/Xamarin section for respective code samples
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
{
Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Output.pdf", "application/pdf", stream);
}
else
{
Xamarin.Forms.DependencyService.Get<ISave>().Save("Output.pdf", "application/pdf", stream);
}Removing layers from an existing PDF document
You can remove the layers from layer collection, represented by the PdfPageLayerCollection of the loaded page. This is illustrated in the following code sample.
//Load the existing PDF document
PdfLoadedDocument document = new PdfLoadedDocument("Input.pdf");
//Gets the first page from the document
PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
//Get the layer collection
PdfPageLayerCollection layers = loadedPage.Layers;
//Remove the layer
layers.RemoveAt(0);
//Save the document
document.Save("Output.pdf");
//Close the document
document.Close(true);'Load the existing PDF document
Dim document As PdfLoadedDocument = New PdfLoadedDocument("Input.pdf")
'Gets the first page from the document
Dim loadedPage As PdfLoadedPage = TryCast(document.Pages(0), PdfLoadedPage)
'Get the layer collection
Dim layers As PdfPageLayerCollection = loadedPage.Layers
'Remove the layer.
layers.RemoveAt(0)
'Save the document.
document.Save("Output.pdf")
'Close the document.
document.Close(True)//Create the file open picker
var picker = new FileOpenPicker();
picker.FileTypeFilter.Add(".pdf");
//Browse and chose the file
StorageFile file = await picker.PickSingleFileAsync();
//Creates an empty PDF loaded document instance
PdfLoadedDocument document = new PdfLoadedDocument();
//Loads or opens an existing PDF document through Open method of PdfLoadedDocument class
await document.OpenAsync(file);
//Gets the first page from the document
PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
//Get the layer collection
PdfPageLayerCollection layers = loadedPage.Layers;
//Remove the layer
layers.RemoveAt(0);
MemoryStream memoryStream = new MemoryStream();
//Save the document.
await document.SaveAsync(memoryStream);
//Close the documents.
document.Close(true);
//Save the stream as PDF document file in local machine. Refer to PDF/UWP section for respected code samples.
Save(memoryStream, "Output.pdf");//Load the PDF document
FileStream docStream = new FileStream("Input.pdf", FileMode.Open, FileAccess.Read);
PdfLoadedDocument document = new PdfLoadedDocument(docStream);
//Gets the first page from the document
PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
//Get the layer collection
PdfPageLayerCollection layers = loadedPage.Layers;
//Remove the layer
layers.RemoveAt(0);
//Save and close the document
MemoryStream stream = new MemoryStream();
document.Save(stream);
stream.Position = 0;
//Close the document.
document.Close(true);
//Defining the ContentType for pdf file.
string contentType = "application/pdf";
//Define the file name.
string fileName = "Output.pdf";
//Creates a FileContentResult object by using the file contents, content type, and file name.
return File(stream, contentType, fileName);//Load the file as stream
Stream docStream = typeof(App).GetTypeInfo().Assembly.GetManifestResourceStream("Sample.Assets.Input.pdf");
PdfLoadedDocument document = new PdfLoadedDocument(docStream);
//Gets the first page from the document
PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
//Get the layer collection
PdfPageLayerCollection layers = loadedPage.Layers;
//Remove the layer
document.Layers.RemoveAt(0);
//Save the document into stream.
MemoryStream memoryStream = new MemoryStream();
document.Save(memoryStream);
//Close the documents.
document.Close(true);
//Save the stream into pdf file
//The operation in Save under Xamarin varies between Windows Phone, Android and iOS platforms. Please refer PDF/Xamarin section for respective code samples.
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
{
Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Output.pdf", "application/pdf", memoryStream);
}
else
{
Xamarin.Forms.DependencyService.Get<ISave>().Save("Output.pdf", "application/pdf", memoryStream);
}Flattening the layers in an existing PDF document
You can flatten a layer in a PDF document by removing it from the PdfDocumentLayerCollection. The following code snippet explains this.
//Load the existing PDF document
PdfLoadedDocument loadedDocument = new PdfLoadedDocument("Layers.pdf");
//Get the layer collection
PdfDocumentLayerCollection layers = loadedDocument.Layers;
//Flatten a layer in the PDF document
layers.RemoveAt(0);
//Save the PDF document
loadedDocument.Save("Output.pdf");
//Close the instance of PdfLoadedDocument
loadedDocument.Close(true);'Load the existing PDF document
Dim loadedDocument As PdfLoadedDocument = New PdfLoadedDocument("Layers.pdf")
'Get the layer collection
Dim layers As PdfDocumentLayerCollection = loadedDocument.Layers
'Flatten a layer in the PDF document
layers.RemoveAt(0)
'Save the PDF document
loadedDocument.Save("Output.pdf")
'Close the instance of PdfLoadedDocument
loadedDocument.Close(True)//Load the existing PDF document
Stream inputStream = typeof(App).GetTypeInfo().Assembly.GetManifestResourceStream("Sample.Assets.Layers.pdf");
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(inputStream);
//Get the layer collection
PdfDocumentLayerCollection layers = loadedDocument.Layers;
//Flatten a layer in the PDF document
layers.RemoveAt(0);
//Create memory stream
MemoryStream stream = new MemoryStream();
//Open the document in browser after saving it
loadedDocument.Save(stream);
//Close the instance of PdfLoadedDocument
loadedDocument.Close(true);
//Save the stream as PDF document file in local machine. Refer to the PDF/UWP section for respective code samples
Save(stream, "Output.pdf");//Load the existing PDF document
FileStream inputStream = new FileStream("Layers.pdf", FileMode.Open);
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(inputStream);
//Get the layer collection
PdfDocumentLayerCollection layers = loadedDocument.Layers;
//Flatten a layer in the PDF document
layers.RemoveAt(0);
//Saving the PDF to the MemoryStream
MemoryStream stream = new MemoryStream();
loadedDocument.Save(stream);
//Set the position as '0'
stream.Position = 0;
//Download the PDF document in the browser
FileStreamResult fileStreamResult = new FileStreamResult(stream, "application/pdf");
fileStreamResult.FileDownloadName = "Output.pdf";
return fileStreamResult;//Load the existing PDF document
Stream inputStream = typeof(App).GetTypeInfo().Assembly.GetManifestResourceStream("Sample.Assets.Layers.pdf");
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(inputStream);
//Get the layer collection
PdfDocumentLayerCollection layers = loadedDocument.Layers;
//Flatten a layer in the PDF document
layers.RemoveAt(0);
//Save the document to the stream
MemoryStream stream = new MemoryStream();
loadedDocument.Save(stream);
//Close the document
loadedDocument.Close(true);
//Save the stream into PDF file
//The operation in Save under Xamarin varies between Windows Phone, Android, and iOS platforms. Refer to the PDF/Xamarin section for respective code samples
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
{
Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Output.pdf", "application/pdf", stream);
}
else
{
Xamarin.Forms.DependencyService.Get<ISave>().Save("Output.pdf", "application/pdf", stream);
}Toggling the visibility of layers
The visibility of a layer can be mentioned while creating a new page layer.
The below code illustrates how to toggle the visibility of layers in new PDF document.
//Create the document
PdfDocument document = new PdfDocument();
//Create a page
PdfPage page = document.Pages.Add();
//Add the first layer and enable the visibility.
PdfPageLayer layer = page.Layers.Add("Layer1",true);
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw Arc.
PdfPen pen = new PdfPen(System.Drawing.Color.Red, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page and disable the visibility.
PdfPageLayer layer2 = page.Layers.Add("Layer2",false);
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
//Save the document.
document.Save("Sample.pdf");
//close the document
document.Close(true);'Create the document
Dim document As New PdfDocument()
'Create a page
Dim page As PdfPage = document.Pages.Add()
'Add the first layer and enable the visibility.
Dim layer As PdfPageLayer = page.Layers.Add("Layer1", True)
Dim graphics As PdfGraphics = layer.Graphics
graphics.TranslateTransform(100, 60)
'Draw Arc.
Dim pen As New PdfPen(System.Drawing.Color.Red, 50)
Dim bounds As New RectangleF(0, 0, 50, 50)
graphics.DrawArc(pen, bounds, 360, 360)
'Add another layer on the page and disable the visibility.
Dim layer2 As PdfPageLayer = page.Layers.Add("Layer2", False)
graphics = layer2.Graphics
graphics.TranslateTransform(100, 180)
'Draw ellipse.
graphics.DrawEllipse(pen, bounds)
'Save the document.
document.Save("Sample.pdf")
'close the document
document.Close(True)//Create the document
PdfDocument document = new PdfDocument();
//Create a page
PdfPage page = document.Pages.Add();
//Add the first layer and enable the visibility.
PdfPageLayer layer = page.Layers.Add("Layer1", true);
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw Arc.
PdfPen pen = new PdfPen(new PdfColor(255, 0, 0), 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page and disable the visibility.
PdfPageLayer layer2 = page.Layers.Add("Layer2", false);
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
MemoryStream memoryStream = new MemoryStream();
//Save the document.
await document.SaveAsync(memoryStream);
//Close the documents.
document.Close(true);
//Save the stream as PDF document file in local machine. Refer to PDF/UWP section for respected code samples.
Save(memoryStream, "Output.pdf");//Create the document
PdfDocument document = new PdfDocument();
//Create a page
PdfPage page = document.Pages.Add();
//Add the first layer and enable the visibility.
PdfPageLayer layer = page.Layers.Add("Layer1", true);
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw Arc.
PdfPen pen = new PdfPen(Syncfusion.Drawing.Color.Red, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page and disable the visibility.
PdfPageLayer layer2 = page.Layers.Add("Layer2", false);
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Draw ellipse.
graphics.DrawEllipse(pen, bounds);
//Save and close the document
MemoryStream stream = new MemoryStream();
document.Save(stream);
stream.Position = 0;
//Close the document.
document.Close(true);
//Defining the ContentType for pdf file.
string contentType = "application/pdf";
//Define the file name.
string fileName = "Output.pdf";
//Creates a FileContentResult object by using the file contents, content type, and file name.
return File(stream, contentType, fileName);//Create the document
PdfDocument document = new PdfDocument();
//Create a page
PdfPage page = document.Pages.Add();
//Add the first layer and enable the visibility.
PdfPageLayer layer = page.Layers.Add("Layer1", true);
PdfGraphics graphics = layer.Graphics;
graphics.TranslateTransform(100, 60);
//Draw Arc.
PdfPen pen = new PdfPen(Syncfusion.Drawing.Color.Red, 50);
RectangleF bounds = new RectangleF(0, 0, 50, 50);
graphics.DrawArc(pen, bounds, 360, 360);
//Add another layer on the page and disable the visibility.
PdfPageLayer layer2 = page.Layers.Add("Layer2", false);
graphics = layer2.Graphics;
graphics.TranslateTransform(100, 180);
//Save the document into stream.
MemoryStream stream = new MemoryStream();
document.Save(stream);
//Close the document.
document.Close(true);
//Save the stream into pdf file
//The operation in Save under Xamarin varies between Windows Phone, Android and iOS platforms. Please refer PDF/Xamarin section for respective code samples.
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
{
Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Sample.pdf", "application/pdf", stream);
}
else
{
Xamarin.Forms.DependencyService.Get<ISave>().Save("Sample.pdf", "application/pdf", stream);
}The following code illustrates how to toggle the visibility of layers in an existing PDF document by disabling the Visible property of PdfLayer.
//Load the existing PDF document
PdfLoadedDocument document = new PdfLoadedDocument("Input.pdf");
//Gets the first layer from the layer collection
PdfLayer layer = document.Layers[0];
//Disable the visibility
layer.Visible = false;
//Save the document
document.Save("Output.pdf");
//Close the document
document.Close(true);'Load the existing PDF document
Dim document As PdfLoadedDocument = New PdfLoadedDocument("Input.pdf")
'Get the first layer from the layer collection
Dim layer As PdfLayer = document.Layers(0)
'Disable the visibility
layer.Visible = False
'Save the document
document.Save("Output.pdf")
'Close the document
document.Close(True)//Load the PDF document as stream
Stream pdfStream = typeof(MainPage).GetTypeInfo().Assembly.GetManifestResourceStream("Sample.Assets.Input.pdf");
//Creates an empty PDF loaded document instance
PdfLoadedDocument document = new PdfLoadedDocument();
//Loads or opens an existing PDF document through Open method of PdfLoadedDocument class
await document.OpenAsync(pdfStream);
//Gets the first layer from the layer collection
PdfLayer layer = document.Layers[0];
//Disable the visibility
layer.Visible = false;
MemoryStream memoryStream = new MemoryStream();
//Save the document.
await document.SaveAsync(memoryStream);
//Close the documents.
document.Close(true);
//Save the stream as PDF document file in local machine. Refer to PDF/UWP section for respected code samples.
Save(memoryStream, "Output.pdf");//Load the PDF document
FileStream docStream = new FileStream("Input.pdf", FileMode.Open, FileAccess.Read);
PdfLoadedDocument document = new PdfLoadedDocument(docStream);
//Gets the first layer from the layer collection
PdfLayer layer = document.Layers[0];
//Disable the visibility
layer.Visible = false;
//Save and close the document
MemoryStream stream = new MemoryStream();
document.Save(stream);
stream.Position = 0;
//Close the document.
document.Close(true);
//Defining the ContentType for pdf file.
string contentType = "application/pdf";
//Define the file name.
string fileName = "Output.pdf";
//Creates a FileContentResult object by using the file contents, content type, and file name.
return File(stream, contentType, fileName);//Load the file as stream
Stream docStream = typeof(App).GetTypeInfo().Assembly.GetManifestResourceStream("Sample.Assets.Input.pdf");
PdfLoadedDocument document = new PdfLoadedDocument(docStream);
//Gets the first layer from the layer collection
PdfLayer layer = document.Layers[0];
//Disable the visibility
layer.Visible = false;
//Save the document into stream.
MemoryStream memoryStream = new MemoryStream();
document.Save(memoryStream);
//Close the documents.
document.Close(true);
//Save the stream into pdf file
//The operation in Save under Xamarin varies between Windows Phone, Android and iOS platforms. Please refer PDF/Xamarin section for respective code samples.
if (Device.OS == TargetPlatform.WinPhone || Device.OS == TargetPlatform.Windows)
{
Xamarin.Forms.DependencyService.Get<ISaveWindowsPhone>().Save("Output.pdf", "application/pdf", memoryStream);
}
else
{
Xamarin.Forms.DependencyService.Get<ISave>().Save("Output.pdf", "application/pdf", memoryStream);
}
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