Add the ability to read and write the camera pose by coordinates from the GUI

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Original report (archived issue) by Chris Spencer (Bitbucket: chrisspen).

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It would be useful if camera's current x/y/z/r/p/y pose values were visible in the left-hand panel, with the option to set them as you would any other Gazebo variable. Currently, if you want to find the exact camera pose, you have to manually position the camera with the mouse, save the world to a file, and then scrap the coordinates from the file.

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

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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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I've started implementing this in c0833bb (branch issue_1595). There's one thing I'd like to add still: reducing the increment for the roll/pitch/yaw boxes when you use the scroll wheel. Currently the increment is 1.0, which is too big.

@chapulina @iche033 any advice?

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

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Currently all pose properties have a default increment of 1.0. We could update all pose properties or just the camera pose, any preference?

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

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I would like the rotation increment reduced for all pose properties. Is that in a qss somewhere?

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

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I made some changes to set the rpy increment to 0.1 in d57f0b5, feel free to change the value by setting the singleStep attribute

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

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See pull request #1649

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

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• changed state from "new" to "resolved"

pull request #1649

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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 Nate Koenig (Bitbucket: Nathan Koenig).

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• changed state from "resolved" to "closed"