Read controller/joint values in joint control widget

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Original report (archived issue) by Thomas Koletschka (Bitbucket: thomasko).

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Currently Gazebo's joint control widget always displays default values but doesn't read the controller's/joint's values. It also doesn't keep the values you set when you deselect and select the model again but rather goes back to displaying its default values.

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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• set assignee_account_id to "557058:5de38267-b118-494c-aa76-4fab35448816"
• changed assignee from "None (Bitbucket: None)" to "scpeters (Bitbucket: scpeters, GitHub: scpeters)"

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Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• changed state from "new" to "on hold"

Until 2.0

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Original comment by Ian Chen (Bitbucket: Ian Chen, GitHub: iche033).

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• changed state from "on hold" to "open"

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Original comment by Ian Chen (Bitbucket: Ian Chen, GitHub: iche033).

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• changed priority from "major" to "minor"

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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• set component to "gui"

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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@chapulina I started working on this long ago, and I heard you mention it the other day.

• 4f4c344
• ce73ef3
• 94096a3
• 62109fb

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Original comment by Louise Poubel (Bitbucket: chapulina, GitHub: chapulina).

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Thanks for pointing me to this issue, I think there's a lot of room for improvement on the joint control widget. I'll take a look at your commits when I have some time.

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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It was basically just adding an extra publisher/subscriber pair. The physics::JointController got a new publisher with current gain values, and the JointControlWidget got a subscriber.

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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• changed component from "gui" to "common::PID"

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Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• set version to "all"

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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@pchorak this might be an interesting issue to look at

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Original comment by Peter Horak (Bitbucket: pchorak).

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@scpeters I added a service to fix this (pull request #2730)

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Original comment by Peter Horak (Bitbucket: pchorak).

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• changed state from "open" to "resolved"

A service was added in pull request #2730 (merged) so that the joint control widget can query the current joint controller values when it switches between models.