AnnDataProvider Object

Summary

Provider for annotations image data.

Syntax
TypeScript
JavaScript
function lt.Annotations.Engine.AnnDataProvider 
class lt.Annotations.Engine.AnnDataProvider() 

Remarks

AnnDataProvider is used to provide support for getting and setting image data when needed in the annotation framework.

AnnRedactionObject and AnnEncryptObject can be used to redact and encrypt an area in the image being annotated. For example the AnnRedactionObject works as follows:

  • Realizing is when the object saves the image data underneath the bounding rectangle and fills it with a black color to hide it from unauthorized users.

  • Restoring is when the saved image data is rendered back into the same rectangle that was erased. Revealing the hidden information back to authorized users.

These operations required the ability to copy image data from and to a particular rectangle in the original image and vice as well as perform simple image processing, in this case, filling with a black color.

These operation are platform and application specific and the image data can be obtained from any type of source and therefore, the generic AnnDataProvider is used.

AnnDataProvider is an abstract class that must be implemented by the application and the following members must be provided:

Member Description
CanWrite
Used by the automation object to detect if this AnnDataProvider supports writing image data.
CanRead
Used by the automation object to detect if this AnnDataProvider supports reading image data.
GetImageData
Returns the image data at the specified location and size.
SetImageData
Sets the image data at the specified location and size.
Fill
Fills with a color the image data at the specified location and size.
Encrypt
Encrypts with a key the image data at the specified location and size.
Decrypt
Decrypts the image data at the specified location and size using a key.

All the Leadtools.Annotations.[Platform] examples projects provide a full implementation of AnnDataProvider for the specific platform. Refer to the source code for an example.

IAnnAutomationControl contains an instance of AnnDataProvider that must be set to provide automation support for the redaction and encryption annotation objects.

The methods of AnnDataProvider are called when:

Requirements

Target Platforms

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Leadtools.Annotations.Engine Assembly