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Dynamic Module with Trigger

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96671] Dynamic Module with Trigger
  • From: Hugh Goyder <h.g.d.goyder at cranfield.ac.uk>
  • Date: Fri, 20 Feb 2009 05:45:50 -0500 (EST)

In the toy DynamicModule below pressing the trigger makes an existing
line longer. The initial length of the line is controlled by a slider.
The module works but I want to add the feature that when I move the
slider the trigger resets itself and the now changed initial line is
drawn. Is it possible to do this?

Thanks
Hugh Goyder

DynamicModule[
 {a = 3, b},
 b = 2;
 Column[{
   Slider[Dynamic[a], {0, 10, 1}],
   Trigger[Dynamic[b, (b = #; b = b + a) &], {0, 25}],
   Row[{Dynamic[{a, b}]}],
   Graphics[{Dynamic[Line[{{0, 0}, {b, 0}}]]},
    PlotRange -> {{0, 40}, {-10, 10}}, Frame -> True,
    ImageSize -> 72 6]
   }]
 ]


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