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Index › Programming Questions & Help › Other Libraries › how to snap controlP5 values
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how to snap controlP5 values (Read 433 times)
Eric F.
how to snap controlP5 values
Jan 25th, 2009, 3:28am  
how can I snap, for example, a slider to 0.1 increments?  i can change the value after the fact but the control doesn't display the corrected value.  i can't set the correct value from the control function because that's recursive.

Code:

void Waves(float _W) {
  // ** this snaps the value to 0.1 increments but the control doesn't reflect that **
  W = round(_W*10.0)/10.0; 
}
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Eric F.
Re: how to snap controlP5 values
Reply #1 - Jan 27th, 2009, 11:01pm  
to put this question another way:

how can you set the value of a controller without having it call the controller function?  this is necessary to avoid recursion.  
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Eric F.
Re: how to snap controlP5 values
Reply #2 - Jan 27th, 2009, 11:15pm  
or, if nobody has the answer to that either, how about this:

how can you format the controller value so it displays one decimal point instead of two?  e.g. 1.0 instead of 1.02.  i know about using nf(), but not sure how to overwrite/extend controller appearance.  
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Eric F.
Re: how to snap controlP5 values
Reply #3 - Feb 9th, 2009, 5:10am  
decimal places: new version of controlP5 has function setDecimalPrecision().

snapping to increments: might come in future version, until then, here's a workaround - you can use a "cheat" function called setValueLabel().   not pretty but it works.  

Code:

void sliderTest(int _x) {
  // snap to increments of 10
  // x is the real var, _x is what slider passes in
  x = (_x/10)*10; 
  controlP5.controller("sliderTest").setValueLabel(str(x));
}
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