Each page has 4 canvasses: an underlay, a visual underlay, an overlay and a visual overlay, all of type Canvas. You draw underneath or on top of a page by adding shapes to one of the 4 layer objects. The layers are non-creatable and retrieved through the [Visual]Underlay and [Visual]Overlay properties of a page object.

For a list of all members of this type, see Canvas Members.

System.Object
   TallComponents.PDF.Shapes.Canvas

Thread Safety

Public static (Shared in Visual Basic) members of this type are safe for multithreaded operations. Instance members are not guaranteed to be thread-safe.

Remarks

The underlay and overlay uses the original coordinate system and doesn't respect page orientation and/or any clipping area. The visual underlay and visual overlay uses a coordinate system that does respect page orientation and/or any clipping area. The visual layer will be placed exact on the resulting visual area shown in a viewer (e.g. Acrobat Reader). Note that if no rotation and/or clipping is available that the visual layer has the same result as the normal layer.

Requirements

Namespace: TallComponents.PDF.Shapes

Assembly: TallComponents.PDF.ReaderControls (in TallComponents.PDF.ReaderControls.dll)

See Also

Canvas Members | TallComponents.PDF.Shapes Namespace

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