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Drawing on an image with TikZ
How to create magnified subfigures and corresponding boxes for portions of a large image

I am a beginner in Latex, trying to use it for an industrial document. I need in one case to use the picture of a device, say looking as a round clock. I am looking at a way to add a number of arrows, pointing inside the picture to points ie the figures indicating 1 am, 3 am 5 am, etc, with the arrows placed approximately radially regarding the clock. The end of the arrows that would be outside of the picture would need to be associated to a caption...such as "recommended position B of the indicator..". I thought this would be relatively easy to do with tikz, and nodes, but could not figure a way to locate the nodes inside the picture. The tip of the arrows should be located accurately inside the picture, therefore placing them in a mechanical way driven by a diameter and an angle would not work well. Any suggestions?

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marked as duplicate by Jake, percusse, Stefan Kottwitz Apr 26 '12 at 19:56

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Is the image (the clock in this case) also TikZ-generated? Or is that an external image you are including? –  Roelof Spijker Apr 10 '12 at 18:06
    
It is an external .jpg image of piece of equipment. The clock was just a way to illustrate the problem. Try to figure a square .jpg picture of a round clock... –  Yves Apr 10 '12 at 18:54
    
Have a look at this question then: tex.stackexchange.com/questions/9559/… –  Roelof Spijker Apr 10 '12 at 19:02
    
Please elaborate on what you mean by "placing them in a mechanical way driven by a diameter and an angle would not work well" ? If they are not at specific angles how do you want to specify them. I'd be best to show an example of how you want to be able to specify the begin and end point of the arrow. –  Peter Grill Apr 10 '12 at 19:39
    
Thanks. Borrowing the code from the link below solved my problem. I plan to show a MWE when I am fully done, both for clarifying my initial task, and solving it. tex.stackexchange.com/questions/9559/… –  Yves Apr 11 '12 at 11:04

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