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Where are the arrow heads? [message #1749619]

Thu, 08 December 2016 17:07

Thomas Johnsson

Messages: 10
Registered: June 2010

Junior Member

How do I get an arrow head for directed edges in my graph application?

I'm using GEF4/Zest 1.0.1.201609060946, (some components have version 1.1.0, but same date).
I notice that when I open the view "GEF4 Zest Graph Example" as deployed, I don't get any arrow heads, whereas in the image in https://wiki.eclipse.org/GEF/GEF4/Zest/Examples there are arrow heads.

Thanks in advance,
Thomas

[Updated on: Thu, 08 December 2016 17:10]

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Re: Where are the arrow heads? [message #1749662 is a reply to message #1749619]

Fri, 09 December 2016 09:57

Matthias Wienand

Messages: 230
Registered: March 2015

Senior Member

Hi Thomas,

thank you for sharing your findings. The arrows vanished when we introduced properties (ZestProperties) for source and target decorations, because the example graph that is displayed by the "Zest Graph Example" does not set these properties. I filed a Bugzilla ticket for the issue [1]. Moreover, the documentation that is available in the Eclipse Wiki is not updated anymore, because it was migrated to GitHub where it is now maintained [2]. However, even there, the images are out-of-date, so I filed another Bugzilla ticket for updating the images in the documentation [3]. Feel free to add a comment to the last ticket if you encounter more inconsistencies w.r.t. the documentation. Also, if you find a bug while playing with the example, feel free to file another Bugzilla ticket [4]. You can subscribe to the tickets to receive notifications when they are updated, but I will also reply again when the arrows are back Smile

[1] Bring back arrows in the Zest Graph Example: https://bugs.eclipse.org/bugs/show_bug.cgi?id=508960
[2] GEF Wiki @ GitHub: https://github.com/eclipse/gef/wiki
[3] Update images in the wiki: https://bugs.eclipse.org/bugs/show_bug.cgi?id=508959
[4] File a Bugzilla ticket for GEF: https://bugs.eclipse.org/bugs/enter_bug.cgi?product=GEF

Best regards,
Matthias

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Re: Where are the arrow heads? [message #1749665 is a reply to message #1749662]

Fri, 09 December 2016 10:32

Thomas Johnsson

Messages: 10
Registered: June 2010

Junior Member

Thanks for the update.
In the mean time, before the arrows are back, could you provide code snippets so it can be done in own code? I.e., Zestproperties plus polygons, or whatever it takes to get it done.
I presume that something in that direction has already been done for the org.eclipse.gef.dot implementation?
Thanks in advance!
Thomas

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Re: Where are the arrow heads? [message #1749669 is a reply to message #1749665]

Fri, 09 December 2016 11:01

Matthias Wienand

Messages: 230
Registered: March 2015

Senior Member

The arrows are back on the master branch. The relevant code is within ZestGraphExample where the example graph is constructed. I added a method e(Node,Node) that creates an edge and sets its target decoration:

	private static Edge e(Node n, Node m) {
		return e(n, m, ZestProperties.TARGET_DECORATION__E, new javafx.scene.shape.Polygon(0, 0, 10, 3, 10, -3),
				ZestProperties.TARGET_DECORATION_CSS_STYLE__E, "-fx-fill: white;");
	}

Best regards,
Matthias

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