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https://issues.apache.org/jira/browse/EDGENT-179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15526708#comment-15526708
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Queenie Ma commented on EDGENT-179:
-----------------------------------
I will be opening a PR with the following changes:
* I looked at the existing defined oplets, updated the current list, and
assigned static colors
* For non-org.apache.edgent defined oplets, generate a random color that is
perceptually different than all assigned colors:
*# Convert the assigned oplet colors from Hex to RGB to XYZ to LAB
*# Generate a random color using the golden ratio conjugate in the RGB color
space (use bright, saturated colors for non-org.apache.edgent defined oplets)
*# Convert RGB to XYZ
*# Convert XYZ to LAB
*# For each assigned oplet color, compute Delta E between the two LAB colors
(new and assigned)
*# If Delta E >= 15 for all pairs of colors, consider the color to be different
enough from the other colors
A few resources that I referenced:
*
http://martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically/
* http://zschuessler.github.io/DeltaE/learn/
* http://www.easyrgb.com/?X=MATH
> console: oplet coloring gradients "too close"
> ---------------------------------------------
>
> Key: EDGENT-179
> URL: https://issues.apache.org/jira/browse/EDGENT-179
> Project: Edgent
> Issue Type: Bug
> Components: Console
> Reporter: Dale LaBossiere
> Assignee: Queenie Ma
> Priority: Minor
> Attachments: EDGENT-179_oplet_colors.png, Screen Shot 2016-09-19 at
> 2.22.00 PM.png
>
>
> The oplet color generator ends up yielding two light purple-ish colors for
> two different kinds of (adjacent) oplets and one can't tell them apart. One
> is a Sink the other is a subtype of Peek - a StreamScope.
> I was seeing this in a ParallelBalancedRecipe app of mine. I can provide it
> if really necessary to repro/improve this.
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