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Reference Guides
Explore the Extended Definitions, OML Guides, Block Library, API Guide and Glossary.
Function Guide for Twin Activate
Provides information about developing and simulating models through the Twin Activate Application Program Interface.
Block Diagram Editor APIs
Learn about the APIs available for manipulating blocks through the Block Diagram Editor.
Diagram
bdeLockDiagramHistory
Takes diagram and locks the version of the history of the diagram so it can not be changed.

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User Guide
Learn about the features and functionality available in Twin Activate.
Reference Guides
Explore the Extended Definitions, OML Guides, Block Library, API Guide and Glossary.
- Extended Definitions for Advanced Users
  PDF file with in-depth information on key topics in the User's Guide.
- Scripting Guide for OpenMatrix Language
  OpenMatrix is a mathematical scripting language.
- Reference Guide for OpenMatrix Language Functions
  The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
- Block Reference Guide
  Describes all of the blocks in the installed Twin Activate library.
- Function Guide for Twin Activate
  Provides information about developing and simulating models through the Twin Activate Application Program Interface.
  - Block Diagram Editor APIs
    Learn about the APIs available for manipulating blocks through the Block Diagram Editor.
    - Annotations
    - Block Manipulation
    - Block Parameters
    - Dialog
    - Selector Dialog
    - Diagram
      - bdeClearSelection
        Takes diagram and clears any selections that have been made.
      - bdeGetContext
        Takes diagram and returns the context for the diagram. These are the definitions for the variables within the diagram.
      - bdeGetDiagramZoom
        Takes diagram and returns the amount of zoom being used when viewing the diagram.
      - bdeGetItemsInDiagram
        Takes diagram and returns a list of all the items within the diagram.
      - bdeGetSelectedItems
        Takes diagram and returns the selected items within the diagram.
      - bdeLockDiagramHistory
        Takes diagram and locks the version of the history of the diagram so it can not be changed.
      - bdeNoteState
        Takes diagram notes any changes that have occured.
      - bdeRedrawDiagram
        Takes diagram and redraws the diagram. Can be used to redraw the selected blocks from bdeSelectBlocks.
      - bdeRemoveAnnotationFromDiagram
        Deletes a given annotation from a diagram.
      - bdeRemoveBlockFromDiagram
        Removes block from diagram. block is of type hwscpHyperBlock.
      - bdeRemoveLinkFromDiagram
        Removes a link from a diagram.
      - bdeSetContext
        Takes diagram and context and sets the context for the diagram. This is the definitions for the variables within the diagram.
      - bdeSetCurrentDiagram
        Takes diagram and sets it to be the current diagram to be used.
      - bdeSaveDiagramAsImage
        Takes diagram and saves it to filepath as an image. Can use types .png, .jpg, and .jpeg.
      - bdeSetDiagramZoom
        Takes diagram and sets the amount of zoom for the diagram.
    - Editor
    - Links
    - Models
    - Ports
    - Simulation Settings
  - Utility APIs
    Learn about the APIs available for obtaining information from Activate models, for example information about variables and environments.
  - Simulation APIs
    Learn about the APIs available for simulating models.
- Glossary
  Key terms associated with the software.
Frequently Asked Questions
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bdeLockDiagramHistory

Takes diagram and locks the version of the history of the diagram so it can not be changed.

Syntax

locked = bdeLockDiagramHistory(diagram)

Inputs

diagram: Diagram used to get locked history.; Type: diagram

Outputs

locked: The locked history of the diagram.; Type: HistoryLocker

Examples

Lock the history of the diagram:

diagram = bdeGetCurrentDiagram();
        locked = bdeLockDiagramHistory(diagram)

locked = hwHistoryLocker