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GEF/GEF4/Zest

< GEF‎ | GEF4
Revision as of 11:20, 25 March 2015 by Unnamed Poltroon (Talk) (Remove outdated contents related to Zest 2.x)

Note to non-wiki readers: This documentation is generated from the Eclipse wiki - if you have corrections or additions it would be awesome if you added them in the original wiki page.

Introduction

GEF4 Zest is a graph visualization component that can be used to visualize GEF4 Graph-based graph models, applying automatic layout as provided by GEF4 Layout. It uses JavaFX and GEF4 FX for visualization purposes and is internally based on GEF4 MVC.

Layout Implementations

The GEF4 Layout interfaces are adopted to the GEF4 Graph data model. The layout objects are constructed from a given Graph object.

Properties

The layout objects support a general properties map. The specific properties for which interface methods are defined are implemented using this properties map.

When transferring the graph objects into layout objects, the attributes of the graph objects are examined, altering the layout objects as follows:

  • LABEL
    Contains the label of the node/edge.
  • EDGE_STYLE
    Specifies if the edge should be drawn solid, dashed, or dotted.
  • GRAPH_TYPE
    Specifies whether edges are directed or undirected.

MVC

The GEF4 MVC component is used as the framework for the viewer.

The ContentParts are implemented for the GEF4 Graph data model:

  • GraphContentPart
  • NodeContentPart
  • EdgeContentPart

An ILayoutModel is used to distribute the LayoutContext to all ContentParts. A GraphRootPart is used to construct the LayoutContext and set it on the ILayoutModel.

ILayoutModel

The ILayoutModel holds a LayoutContext.

GraphRootPart

The GraphRootPart stores a LayoutContext in the ILayoutModel. That LayoutContext is created when the viewer's content changes. The GraphRootPart does also listen to viewport changes to trigger a re-layout.

ZestFXExampleView

The ZestFXExampleView is a viewer for an example graph:

ZestFXExampleView

Migration from Zest 1.x to GEF4 Zest

GEF4 Zest was mostly written from scratch, replacing the Zest 1.x API as well as the provisional Zest 2.x API ( Zest 2.0 Layout API) that was developed as an intermediate step.

TODO: Provide detailed information on how to migrate from Zest 1.x to GEF4 Zest, as indicated within bugzilla #441131.

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