Does Locator Have an Option to Constrain its Movement

Questions
, ,
1

Hello everyone,

I’d like to constrain a locator’s movement to integer increments. I know how to do that by resetting its position using Dynamic but was wondering whether the Locator function has such an option like Slider2D does.

Gregory

2

I think you have to use the method relying on re-setting the position (using Round), as in the example under Applications in the documentation page of Locator.

3

Much obliged, Szabolcs.

Gregory

4

A special feature of Round is that the second argument can also be a list. This makes it easy to round a 2D-point with different granularity along the first and second dimensions. For example, Round[{3.1, 6.5}, {2, 1}] gives {4,6}.

5

I didn’t know that. Excellent. Thanks!

Gregory

6

Good evening. You say you know how to do that by resetting its position using Dynamic to constrain a locator’s movement to integer increments. Can you tell me how? if you is so kind. My idea is to include in Manipulate.

Thank in advance

7

A Manipulate example:

Manipulate[
 	p = Round[p];
 	Graphics[PlotRange -> 10, Axes -> True, PlotLabel -> p],
 	{p, ContinuousAction -> False, Locator}
 ]
8

Thank you so much.