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The following tips might come in handy...
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This exercise will introduce the usage of the Eclipse Plugin Development Environment for developing new layout algorithms to be used in Eclipse diagram editors. Replace each <login> by your own login name (e.g. msp), and each <Login> by your login name with capitalized first letter (e.g. Msp). For any questions contact msp.
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Before you can test your layout code, you will have to register your new layout provider with KIML.
- Open the
META-INF/MANIFEST.MF
file again and switch to the Extensions tab. - Add an extension for
de.cau.cs.kieler.kiml.layout.layoutProviders
. - Right-click the extension → New → layoutProviderSet name to <Login> Test Layouter, class to de.cau.cs.rtprak.<login>.tutorial2.<Login>LayoutProviderand click New > layoutAlgorithm.
- Set the name to
Login_name Test Layouter
and the class to your layout provider class name. - Right-click the new layoutProvider → New → knownOption, set option to denew layoutAlgorithm and click New > knownOption. Set option to
de.cau.cs.kieler.spacing
. - Add another knownOption, set to deanother knownOption for
de.cau.cs.kieler.borderSpacing
Run → Run Configurations... → right-click Eclipse Application → New - Name: Layout
- For testing the layouter, a new workspace location will be created; you may configure its destination in Workspace Data → Location
- Add the program arguments
-debug -consoleLog
in the Arguments tab. Go to Plug-ins tab, select Launch with: . - Save the editor.
We will now have to add a new run configuration that will start an Eclipse instance with your layout code loaded into the application, ready to be used.
- Click Run > Debug Configurations...
- Right-click Eclipse Application and click New. Set the configuration's name to
Layout Test
. - In the Arguments tab, make sure the the program arguments include
-debug
and-consoleLog
. - On the Plug-ins tab, set Launch with to plug-ins selected below only. Click Deselect All, activate Workspace checkbox, check the Workspace item in the tree, and click Add Required Plug-ins, Apply, Run.
- Click Apply to save your changes and then Debug to start an Eclipse instance to test with.
Test the layouter in
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your new Eclipse instance:
- Click New → > Project... → General → Project, name test > General > Project and set the project name to something like
Test
. - Right-click test project → New → Other... → KEG Diagram (TODO: if graphs shall be created in another way, describe it here)
- Create a graph using the palette on the right.
- Window → Show View → Other... → KIELER → Layout
- While the graph diagram is open, set Layout Provider or Type in the Layout view to <Login> Test Layouter.
- Open the additional views Layout Graph and Layout Time. Trigger layout with the KIELER Layout button in the toolbar or the new project and click New > Empty KEG Graph. Enter a meaningful name and click Finish.
- Put a few nodes into the diagram. To properly test your code, you will want to vary the sizes of the nodes. It may also be a good idea to get into the habit of giving each node a different name, such as N1, N2, etc. This will help you later if you have to debug your algorithm.
- Open the Layout view through Window > Show View > Other... > KIELER Layout > Layout.
- With your KEG diagram selected, set the Layout Algorithm option in the Layout view to your new algorithm.
- Save your KEG diagram.
- Trigger automatic layout by clicking the layout button in the toolbar, or by hitting Ctrl+R L (first Ctrl+R, then L).See
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output of your algorithm |
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/**
* Route the edges that are connected with the children of the given node.
* @param parentNode the parent node of the input graph
*/
public void routeEdges(final KNode parentNode) {
getMonitor().begin("Edge Routing", 1);
getMonitor().done();
}
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EdgeRouter edgeRouter = new EdgeRouter(); edgeRouter.routeEdges(layoutNode);
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and the time it took to run it through the Layout Graph and Layout Time views. The views are available through the |
Once you're satisfied with your node placement code, it's time to take care of edge routing.
Add a new method that will implement the edge routing using the following skeleton code:
Code Block language java /** * Routes the edges connecting the nodes in the given graph. * * @param parentNode the graph whose edges to route. * @return height used for edge routing. private float routeEdges(final KNode parentNode) { // TODO: Implement edge routing return 0; }
- Add a call to
routeEdges(...)
in yourdoLayout(...)
method and implement the latter.
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Here's a few tips for implementing the edge routing:
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KEdgeLayout edgeLayout = edge.getData(KEdgeLayout.class);
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KPoint point = KLayoutDataFactory.eINSTANCE.createKPoint();
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Once you're done implementing the edge routing code, test it by running your debug configuration again, as before.