Creating a 360 GUI knob

Lane

2018 11 2

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I need to create a GUI to control the direction in which an arrow is facing. The obvious control is the Knob, which conveys direction visually. EXCEPT that the Knob (at least as far as I can tell) has a fixed range from about -160 degrees to +160 degrees (with 0 being vertical). Which leaves me with two options:

Use the range -160 to +160 to allow the user to specify -180 to +180, which has the horrible effect that dial angle and arrow angle are not the same

Use the range -160 to +160 to allow the user to specify -160 to +160, which means my dial angle and my arrow angle are the same but has the horrible effect that the user can never point the arrow straight down!

What I really need is a control that just spins and returns the angle it's pointing at, but short of that is there a way to get the Knob to behave as I need?

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Walter Roberson 2018-11-2

Though you could probably pull in a package such as https://github.com/sojamo/controlp5/blob/master/src/controlP5/Knob.java and put the knob into a JPanel, perhaps using hints from https://undocumentedmatlab.com/blog/customizing-matlab-uipanels

Lane 2018-11-2

编辑：Lane 2018-11-2

Thanks! If the quick-and-dirty tool I am building becomes a workhorse, I may go back and try some customization. For now I'm just going to put in an unintuitive slider and an accompanying figure that shows orientation.

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