RFR: 7831: Add new view for hierarchical edge bundling [v14]

[Marcus Hirt]

On Fri, 5 Aug 2022 19:04:34 GMT, Brice Dutheil <duke at openjdk.org> wrote:

>> Joint effort with @cimi to provide _hierarchical edge_ visualization to JMC.
>> 
>> ![Hierarchical Edge view](https://user-images.githubusercontent.com/803621/176186654-04f458f5-6f7d-4755-822c-f63e53ccfc31.png)
>> 
>> Here when the mouse hovers `java.util.concurrent` on the bottom right. One can see the relations with other packages.
>> 
>> 
>> Based on the preliminary work of @cimi here : https://observablehq.com/@cimi/jfr-graph-hierarchical-edge-bundling
>
> Brice Dutheil has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add newlines to end of all files

The saturation / contrast in the icons could probably be a bit higher, but it looks great! Well done!

application/org.openjdk.jmc.flightrecorder.dependencyview/src/main/java/org/openjdk/jmc/flightrecorder/dependencyview/DependencyView.java line 197:

> 195: 	private volatile ModelState modelState = ModelState.NONE;
> 196: 	private ModelRebuildRunnable modelRebuildRunnable;
> 197: 	private int packageDepth = 3;

Would it perhaps be better to start with 2 here? The hierarchical edge bundling gets pretty busy with 3.

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Marked as reviewed by hirt (Lead).

PR: https://git.openjdk.org/jmc/pull/405