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Locator appearance

Posted 12 years ago
Even though Locators are used in Graphics, it seems that the appearance of a locator has to be text!
Is there any way to provide a graphic instead, so one could do precise positioning of the locator?
POSTED BY: Luc Barthelet
2 Replies
Patrick,
You are correct. I was confused by the construct Locator[ Dynamic, "x"] for example. I assumed that the graphics code was using the display of the element inside locator to know if the user was clicking on the locator or not. I was trying to put the Dynamic[Point] inside the Locator parameters. Obviously from your example it is not the way to do it. 

This was very useful, it helped me fix my code.

Thank you,
Luc
POSTED BY: Luc Barthelet
I'm afraid I don't understand what exactly you mean. A Locator doesn't has to have an appearance at all and you can use of course graphical primitives to display them. What about this here? It uses a small point and shows you the exact location in the graphics:

With[{lines = {Line[#], Line[Transpose[#]]} &@
    Table[{x, y}, {y, 0, 1, .1}, {x, 0, 1, .1}]},
 Deploy[DynamicModule[{p = {.5, .5}},
   Graphics[{lines, PointSize[.015], Red, Dynamic[Point[p]],
     Locator[Dynamic[p], None], Dynamic[Text[p, {.5, 1.1}]]}
    , Axes -> True
    ]
]]]

POSTED BY: Patrick Scheibe
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