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DanRRight
Joined: 10 Mar 2008 Posts: 1618 Location: South Pole, Antarctica

Posted: Sat May 25, 2013 5:28 am Post subject: New LOG slider option 


I'd really like to see in CWP the following option. Consider this example
x=1
winio@('%20sl[LOG]', X, 0.01D0, 100.0D0)
With current linear scale we get initially at X=1 slider being too close to zero and it is impossible to do smooth sliding between 0.01 and 1.
With LOG scale slider would initially stay in the middle which correspond X=1. At 0 and 1/4 of slider length X will be equal 0.01 and 0.1 and at 3/4 and full slider length X=10.0 and 100.0 respectively
This should emulate known tech of LOG variable resistors used everywhere as sound regulators. With current linear slider scale we have to supply additional callback functions which transform linear slider into log 

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PaulLaidler Site Admin
Joined: 21 Feb 2005 Posts: 4997 Location: Salford, UK

Posted: Sat May 25, 2013 6:44 am Post subject: 


I will add this to the wish list.
If you could supply code for the callback then this would clarify what you are asking for. 

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DanRRight
Joined: 10 Mar 2008 Posts: 1618 Location: South Pole, Antarctica

Posted: Sat May 25, 2013 7:05 pm Post subject: 


How we all work with LOG? I'll be more verbose, may be somebody will start using Clearwin/sliders/Simpleplot after that  the more users the more features. We do all manipulations with the exponent Y as in 10^Y or e^Y or other base ( which does not matter, it's just the convenience) instead of the X number itself which is equal 10^Y and when all manipulations with Y (which scales linearly) are done then we turn Y into the final number X=10^Y.
SO i use inside the slider instead of value X as in the example above its exponent Y=log10(X) and instead of mentioned limits 0.01 and 100 their log10(limits) which are 2 and 2. Initial value of slider is also substituted by log10(initialvalue)=log10(1) = 0.
Then inside the code i transform slider value Y to final needed value X just by X=10**Y. The code below demonstrates how difficult to use linear slider for calculating for example the frequency of LC circuit and how nice all goes with LOG one. I took L,C initially =1 and varying C in the mentioned above range. Transformation goes inside the function transfExpToValue
The option LOG (and may be LIN) to the slider looks like natural addition (as always better dynamically updatable). This will simplify integration with %fl%df%rf if they are also duplicating the slider functionality in more complex GUIs
Code: 
WINAPP
INCLUDE <windows.ins>
integer transfExpToValue, SettingXYforPlotting
external transfExpToValue, SettingXYforPlotting
PARAMETER(n=1000)
REAL*8 X(n),Y(n), ExpOfC, C, L
common X, Y, ExpOfC, C, L, kBusyPlotting
kBusyPlotting=0
L=1
ExpOfC=0
i=winio@('%ww%ca[LOG Slider]&')
i=winio@('%`bg[yellow] Log %ta%30^sl log10(C) %5rf %ta%`bg[yellow] C %5rf%ff&', &
ExpOfC, 2d0, 2d0, '+', transfExpToValue, SettingXYforPlotting, ExpOfC, C)
i=winio@('%`bg[gray] Linear %ta%30^sl %3ta%`bg[gray] C %5rf %ff&', C, 0.01d0, 100d0, &
SettingXYforPlotting, C)
i=winio@('%pv%pl[x_array]%ff&',600,400,N,x,y)
i=winio@('%sc&','+',transfExpToValue,SettingXYforPlotting)
i=winio@('%ac[esc]&','exit')
i=winio@('%ff%cn%tt[OK]')
END
!......................................
integer function transfExpToValue ()
PARAMETER(n=1000)
REAL*8 X(n),Y(n), ExpOfC, C, L
common X, Y, ExpOfC, C, L, kBusyPlotting
C = 10.**ExpOfC
transfExpToValue=1
end function
!.......................................
integer function SettingXYforPlotting()
INCLUDE <windows.ins>
PARAMETER(n=1000)
REAL*8 X(n),Y(n), ExpOfC, C, L
common X, Y, ExpOfC, C, L, kBusyPlotting
do i= 1, n
X(i)=i/100.
Y(i)=SIN( X(i)/sqrt(L*C) )
enddo
if(kBusyPlotting.eq.1) goto 1
kBusyPlotting = 1
call simpleplot_redraw@
kBusyPlotting = 0
1 continue
SettingXYforPlotting=1
end function 


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