Section:

Rectangle Annotations

Rectangle annotations are one of the basic shapes for annotating. You can use this to box certain areas on a document to bring attention to them.

Rectangle annotations can have both a fill and stroke color. The stroke or border style can also be changed between a solid, dashed, or cloudy style.

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Instantiation

1WebViewer(...)
2  .then(instance => {
3    const { documentViewer, annotationManager, Annotations } = instance.Core;
4
5    documentViewer.addEventListener('annotationsLoaded', () => {
6      const annot = new Annotations.RectangleAnnotation({
7        PageNumber: 1,
8        X: 100,
9        Y: 50,
10        Width: 150,
11        Height: 25,
12        StrokeColor: new Annotations.Color(0, 255, 0, 1), 
13      });
14
15      annotationManager.addAnnotation(annot);
16      annotationManager.redrawAnnotation(annot);
17    });
18  });

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Element name: square

sh

1<square page="0" rect="252.100,604.080,331.510,659" color="#E44234" flags="print" name="7103e3a5-515e-9e61-007e-b595d3c754ce" title="Guest" subject="Rectangle" date="D:20220601141141-07'00'" creationdate="D:20220601141116-07'00'"/>

Required properties

PageNumber

Gets or sets the page number of a document that the annotation appears on.

X

Gets or sets the annotation's x-axis position.

Y

Gets or sets the annotation's y-axis position.

Height

Gets or sets the height of the annotation.

Width

Gets or sets the width of the annotation.

Notable properties

For the full list of properties, please visit the annotation's API docs.

FillColor

Gets or sets the color of the annotation's interior.

StrokeColor

Gets or sets the color of the annotation's stroke.

StrokeThickness

Gets or sets the width of the annotation's stroke outline.

Style

Gets or sets the border style of an annotation. Possible styles include:

  • solid
  • dash
  • cloudy

Dashes

Gets or sets the border dash style of an annotation. This expects a string representing the length of dashes and spacing inbetween, delimited by commas (ex. 3, 3). You can specify any amount of lengths but, an odd number of values will be made even by cloning it as a second set. To understand further, you can read more about the setLineDash API.

Intensity

Describes intensity of cloudy style effect. Use 0 for no effect.

Author

The author of the annotation.

Color

Gets or sets the annotation's stroke color.

Hidden

Gets or sets whether the annotation is hidden.

Invisible

Gets or sets whether the annotation is invisible, only if it is an unknown annotation type. Generally for hiding annotations you should use "Hidden".

IsClickableOutsideRect

Gets or sets whether any parts of the annotation drawn outside of the rect are clickable.

Listable

Gets or sets whether the annotation should be listed in annotation lists. If set to false, the annotation will also become unselectable.

Locked

Gets or sets whether the annotation is locked or not. If it's locked it can't be edited or deleted, but the note can be edited.

LockedContents

Gets or sets whether the annotation contents are locked or not. If the contents are locked then note can't be edited but the annotation can be edited or deleted.

NoDelete

Gets or sets if this annotation can be deleted.

NoMove

Gets or sets whether or not the annotation can be moved.

NoResize

Gets or sets if this annotation can be resized by the user.

NoRotate

Gets or sets if this annotation can be rotated.

NoView

Gets or sets whether the annotation is visible on the screen. Differs from Hidden in that it can still be printed if the print flag is set.

NoZoom

Gets or sets if this annotation scales with the page.

Opacity

Gets or sets the opacity of the annotation.

Printable

Gets or sets whether the annotation should be displayed when printing the page.

ReadOnly

Gets or sets whether the annotation is readonly or not. If it's readonly both the annotation itself and its note can't be edited or deleted.

ToggleNoView

Gets or sets whether the ToggleNoView flag is set on the annotation.

Useful methods

setRect

Although rectangle annotations have both move and resize APIs, it also provides a setRect API which effectively does both which makes it worthy to note.

1WebViewer(...)
2  .then(instance => {
3    const { annotationManager, Annotations } = instance.Core;
4
5    annotationManager.addEventListener('annotationChanged', (annotations, action) => {
6      if (action === 'add') {
7        annotations.forEach(annot => {
8          if (annot instanceof Annotations.RectangleAnnotation) {
9            const rect = annot.getRect();
10            rect.X = Math.round(rect.X);
11            rect.Y = Math.round(rect.Y);
12            rect.Width = Math.round(rect.Width);
13            rect.Height = Math.round(rect.Height);
14
15            annot.setRect(rect);
16          }
17        });
18      }
19    });
20  });

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Alternative use cases

Rectangle annotations can be used as placeholders to be replaced with something else. In WebViewer, the form builder uses rectangles to represent certain forms fields, and swapping them out for the actual form field widget annotations after pressing Apply Fields.

To check whether an annotation is a form field placeholder, you can check with the isFormFieldPlaceholder API.

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