Re: Customizing Manipulate's Autorun

*To*: mathgroup at smc.vnet.net*Subject*: [mg110632] Re: Customizing Manipulate's Autorun*From*: John Fultz <jfultz at wolfram.com>*Date*: Tue, 29 Jun 2010 08:27:30 -0400 (EDT)*Reply-to*: jfultz at wolfram.com

Two comments... First, did you consider setting bookmarks and animating through them instead of using the autorun functionality? This is well-documented and generally easier to puzzle out than the approach you took, I think. The bookmarks serve as keyframes which you can animate between. Something like this... Manipulate[ Graphics[{color, Disk[{x, y}, 0.1]}, PlotRange -> {{-1.2, 1.2}, {-1.2, 1.2}}], {{color, Black}, {Black -> "Black", Red -> "Red"}}, {{x, 0}, -1, 1}, {{y, 0}, -1, 1}, Bookmarks -> {"frame1" :> (x = 1; y = 0; color = Black), "frame2" :> (x = 0; y = -1; color = Red), "frame3" :> (x = -1; y = 0; color = Red), "frame4" :> (x = 0; y = 1; color = Black), "frame5" :> (x = 1; y = 0; color = Black)}] Then choose "Animate Bookmarks" instead of "Autorun". Second, there is a much easier technique for making a hidden control. Manipulate supports this directly using the ControlType option. E.g., Control[{{t, 0}, 0, 4*Pi, Pi/12, ControlType -> None}] There are several examples in the Manipulate documentation which highlight this usage. Sincerely, John Fultz jfultz at wolfram.com User Interface Group Wolfram Research, Inc. On Tue, 29 Jun 2010 06:58:55 -0400 (EDT), Ingolf Dahl wrote: > I was about to write to MathGroup with a question how to customize the > Autorun feature of Manipulate to stop it from running the controls > sequentially and instead shake them simultaneously. But when I was > preparing the question I found a solution, and since it was nontrivial I > want to share it. The trick was to create a special hidden control, which > manipulates the default values of the other controls dynamically. > > It is in the essence of this kind of solutions that it describes > undocumented, or poorly documented features of Mathematica, and such > features might be changed in future versions. But if the content of this > notebook already was described in the documentation, there was no reason > for me to repeat it. > > Sometimes we might want to control the Autorun feature of a Manipulate > cell. Autorun can be started from the little "+" in a gray circle in the > upper right corner of the Manipulate cell. Let us start with a simple > Manipulate cell. > > Manipulate[ > Graphics[{color, Disk[{x, y}, 0.1]}, > PlotRange -> {{-1.2, 1.2}, {-1.2, 1.2}}], {{color, > Black}, {Black -> "Black", Red -> "Red"}}, {{x, 0}, -1, > 1}, {{y, 0}, -1, 1}] > > Say, that we want the dot going around a circle instead! We add another > control t to fix that, and let that control take over Autorun : > > Manipulate[ > If[t > 0, x = Cos[t]; y = Sin[t]; color = Red, color = Black]; > Graphics[{color, Disk[{x, y}, 0.1]}, > PlotRange -> {{-1.2, 1.2}, {-1.2, 1.2}}], {{color, > Black}, {Black -> "Black", Red -> "Red"}}, {{x, 0}, -1, > 1}, {{y, 0}, -1, 1}, {t, 0, 4*Pi}, AutorunSequencing -> {{4, 10}}] > > If we test the Autorun, we see a jitter in the other controls, since they > are reset to their default whenever they are changed by t. The processor > will be occupied by changing the controls back and forth. Moreover, the > color control is locked up when Autorun is inactive. Can we fix that? > Yes, we might control the other parameters without jitter if we control > their default values dynamically. We might check if we are in the Autorun > mode by testing the variable Typeset`bookmarkMode$$. The variable t has > also been changed to run stepwise. > > Manipulate[ > If[Typeset`bookmarkMode$$ === "Autorun", > If[t < 2*Pi, color1 = Red, color1 = Black]; x1 = Cos[t]; > y1 = Sin[t]]; > Graphics[{color, Disk[{x, y}, 0.1]}, > PlotRange -> {{-1.2, 1.2}, {-1.2, 1.2}}], > Control[{{x, Dynamic[x1], "x"}, -1, 1}], > Control[{{y, Dynamic[y1], "y"}, -1, 1}], > Control[{{color, Dynamic[color1], "color"}, {Black -> "Black", > Red -> "Red"}}], Control[{{t, 0}, 0, 4*Pi, Pi/12}], > AutorunSequencing -> {{4, 10}}, > Initialization :> {color1 = Black; x1 = 0.; y1 = 0.}] > > Can we have the control for t invisible? Note the uncommon programming > construction "If[False,...". In this embedding the control for t will > never show up, but it is anyway found by the AutorunSequencing as the > fourth control. > > Manipulate[ > If[Typeset`bookmarkMode$$ === "Autorun", > If[t < 2*Pi, color1 = Red, color1 = Black]; x1 = Cos[t]; > y1 = Sin[t]]; > Graphics[{color, Disk[{x, y}, 0.1]}, > PlotRange -> {{-1.2, 1.2}, {-1.2, 1.2}}], > Control[{{x, Dynamic[x1], "x"}, -1, 1}], > Control[{{y, Dynamic[y1], "y"}, -1, 1}], > Control[{{color, Dynamic[color1], "color"}, {Black -> "Black", > Red -> "Red"}}], > Dynamic[If[False, Control[{{t, 0}, 0, 4*Pi, Pi/12}], > Pane[" ", {0, 0}]]], AutorunSequencing -> {{4, 10}}, > Initialization :> {color1 = Black; x1 = 0.; y1 = 0.}] > > Please send comments to ingolf.dahl at telia.com. > The corresponding notebook might be available at > http://www.familydahl.se/mathematica/CustomizingManipulatesAutorun.nb > > Best regards > > Ingolf Dahl

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