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Re: Need Help With Locator in a Manipulate

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  • Subject: [mg132274] Re: Need Help With Locator in a Manipulate
  • From: Gregory Lypny <gregory.lypny at videotron.ca>
  • Date: Tue, 28 Jan 2014 06:16:23 -0500 (EST)
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Thanks again Bob,

Much appreciated as always. I figured out how to stop the jiggle. I put the statement for resetting the locator in the Epilog of the plot in the way I described in my previous email

	Locator[Dynamic[pt2, pt2 = {pt2[[1]], m pt2[[1]] + pt1[[2]] - m*pt1[[1]]}]]

 and in the control section of the Manipulate, I set the Appearance of the locator to None.

	{{pt2, {25, 80}}, Locator, Appearance -> None},

That way the locator is visible only in its reset position. Its pretty smooth now. I'm going to include your tooltips. Nice idea!

Gregory


On Sun, Jan 26, 2014, at 4:55 PM, Bob Hanlon <hanlonr357 at gmail.com> wrote:

> I don't know how to stop the giggle but this adds tooltips over the locators. I also changed the definition of the curve to be a more direct function of x.
>
> Manipulate[
>  Module[
>   {f, b, xmin = 0, xmax = 100},
>   b = pt1[[2]] - m*pt1[[1]];
>   f[{x1_, y1_}, x_] = (x1/x)^(a/(1 - a)) y1;
>   pt2 = {pt2[[1]], m pt2[[1]] + b};
>   Plot[{f[pt1, x], m x + b},
>    {x, 0, 100},
>    Epilog -> {White,
>      Tooltip[Disk[pt1, {1, 2}], StringForm["pt1 = ``", pt1]],
>      Tooltip[Disk[pt2, {1, 2}], StringForm["pt2 = ``", pt2]]},
>    AxesOrigin -> {0, 0},
>    PlotRange -> {{xmin, xmax}, {Automatic, 200}}]],
>  {{a, .5, "Shape (a)"}, .2, .8, .01,
>   Appearance -> "Labeled"},
>  {{m, -1, "Slope (m)"}, -3, -.4, .01,
>   Appearance -> "Labeled"},
>  {{pt1, {10, 80}}, Locator},
>  {{pt2, {50, 40}}, Locator}]
>
>
> Bob Hanlon





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