Ink annotation in the Blazor SfPdfViewer component
13 Oct 20255 minutes to read
The Blazor SfPdfViewer component supports adding, editing, and deleting ink annotations.
Adding an ink annotation to the PDF document
Ink annotations can be added using the annotation toolbar.
- Select the Edit Annotation button in the SfPdfViewer toolbar to open the annotation toolbar.
- Choose the Draw Ink button to enable ink mode.
- Draw on any page of the loaded PDF document.
@using Syncfusion.Blazor.Buttons
@using Syncfusion.Blazor.SfPdfViewer
<SfButton OnClick="OnClick">Ink Annotation</SfButton>
<SfPdfViewer2 @ref="viewer" DocumentPath=@DocumentPath Height="100%" Width="100%" ></SfPdfViewer2>
@code {
SfPdfViewer2 viewer;
private string DocumentPath { get; set; } = "wwwroot/Data/PDF_Succinctly.pdf";
public async void OnClick(MouseEventArgs args)
{
await viewer.SetAnnotationModeAsync(AnnotationType.Ink);
}
}Editing the properties of the ink annotation
The stroke color, thickness, and opacity of an ink annotation can be modified using the corresponding tools in the annotation toolbar.
Editing stroke color
Change the stroke color using the color palette available in the Edit Stroke Color tool.
Editing thickness
Adjust the border thickness using the range slider in the Edit Thickness tool.
Editing opacity
Control the transparency using the range slider in the Edit Opacity tool.
Setting default properties during the control initialization
Default properties for ink annotations can be configured before rendering the component using InkAnnotationSettings. After interacting with the toolbar, subsequent annotations will use the most recently selected values.
@using Syncfusion.Blazor.SfPdfViewer
<SfPdfViewer2 @ref="viewer"
DocumentPath=@DocumentPath
Height="100%"
Width="100%"
InkAnnotationSettings="@InkAnnotationSettings">
</SfPdfViewer2>
@code {
SfPdfViewer2 viewer;
private string DocumentPath { get; set; } = "wwwroot/Data/PDF_Succinctly.pdf";
PdfViewerInkAnnotationSettings InkAnnotationSettings = new PdfViewerInkAnnotationSettings
{
Author = "Syncfusion",
StrokeColor = "green",
Thickness = 3,
Opacity = 0.6
};
}Add ink annotation programmatically
The Blazor SfPdfViewer supports programmatically adding ink annotations using the AddAnnotationAsync method. Use the PdfAnnotation model with AnnotationType.Ink and define its Bound and path data.
Below is an example demonstrating how to add an ink annotation to a PDF document:
@using Syncfusion.Blazor.Buttons
@using Syncfusion.Blazor.SfPdfViewer
<SfButton OnClick="@AddInkAnnotationAsync">Add Ink Annotation</SfButton>
<SfPdfViewer2 Width="100%" Height="100%" DocumentPath="@DocumentPath" @ref="@Viewer" />
@code {
SfPdfViewer2 Viewer;
public string DocumentPath { get; set; } = "wwwroot/Data/Ink_Annotation.pdf";
public async void AddInkAnnotationAsync(MouseEventArgs args)
{
PdfAnnotation annotation = new PdfAnnotation();
// Set the annotation type of Ink
annotation.Type = AnnotationType.Ink;
// Set the PageNumber starts from 0. So, if set 0 it repersent the page 1.
annotation.PageNumber = 0;
// Bound of the Ink annotation
annotation.Bound = new Bound();
annotation.Bound.X = 200;
annotation.Bound.Y = 150;
annotation.Bound.Width = 150;
annotation.Bound.Height = 100;
// Ink annotation path data;
annotation.Data = 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// Add Ink annotation
await Viewer.AddAnnotationAsync(annotation);
}
}This code adds an ink annotation to the first page of the PDF document (page indices are zero-based).
View programmatic ink annotation sample on GitHub.
Edit ink annotation programmatically
The Blazor SfPdfViewer supports programmatic editing of ink annotations using the EditAnnotationAsync method. Retrieve annotations with GetAnnotationsAsync and modify properties such as position, size, StrokeColor, and Opacity.
Below is an example demonstrating how to edit an ink annotation programmatically:
@using Syncfusion.Blazor.Buttons
@using Syncfusion.Blazor.SfPdfViewer
<SfButton OnClick="@EditInkAnnotationAsync">Edit Ink Annotation</SfButton>
<SfPdfViewer2 Width="100%" Height="100%" DocumentPath="@DocumentPath" @ref="@Viewer" />
@code {
SfPdfViewer2 Viewer;
public string DocumentPath { get; set; } = "wwwroot/Data/Ink_Annotation.pdf";
public async void EditInkAnnotationAsync(MouseEventArgs args)
{
// Get annotation collection
List<PdfAnnotation> annotationCollection = await Viewer.GetAnnotationsAsync();
// Select the annotation want to edit
PdfAnnotation annotation = annotationCollection[0];
// Change the position of the ink annotation
annotation.Bound.X = 125;
annotation.Bound.Y = 125;
// Change the width and height of the ink annotation
annotation.Bound.Width = 100;
annotation.Bound.Height = 75;
// Change the stroke color of ink annotation
annotation.StrokeColor = "#FFFF00";
// Change the opacity (0 to 1) of ink annotation
annotation.Opacity = 0.5;
// Edit the ink annotation
await Viewer.EditAnnotationAsync(annotation);
}
}This code edits the first available ink annotation programmatically within the SfPdfViewer component.
View programmatic edit sample on GitHub.