Update a graph using a slider

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Hello,

I am trying to update a graph by choosing the initial and final indices of the data wave using sliders.
I have something like this:
Window graph() : Graph
    Variable start,stop
    PauseUpdate; Silent 1       // building window...
    start = 0
    stop =  DimSize(pos,0)
    display vel[start,stop] vs pos[start,stop]
    ControlBar 42
    Slider slider0 vert=0,proc=SliderProc,limits={0,DimSize(pos,0),0}  
EndMacro

Function SliderProc(ctrlName,sliderValue,event) : SliderControl
    String ctrlName
    Variable sliderValue
    Variable event  // bit field: bit 0: value set, 1: mouse down, 2: mouse up, 3: mouse moved

    if(event %& 0x1)    // bit 0, value set
       
    endif

    return 0
End

How do I proceed to make the graph update based on the values of start, stop?
Thanks
I typically would use a fixed display wave, e.g."root:DisplayData", which is redefined in the control procedure, e.g., by duplicate /O /R(Start,Stop) datawave root:displaywave within your if clause.
(Usually I have a fixed frame size and only use an assignment, but with dynamic ranges overwriting might be better than redefining)

Other opinions?
HJ

July 9, 2015 at 03:32 pm - Permalink

You can use ReplaceWave to replace trace with another that is different only in the subrange. Try it first using the Replace Wave item from the Graph menu to see what the command looks like.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

July 9, 2015 at 04:11 pm - Permalink

You may be doing unnecessary work if Igor's Graph->Packages->Axis Slider is sufficient.

If not, you can look at that code to see how a slider can change a graph's axis range.

Function WMAxisSliderProc(name, value, event)
    String name // name of this slider control
    Variable value  // value of slider
    Variable event  // bit field: bit 0: value set; 1: mouse down, //   2: mouse up, 3: mouse moved

    String dfSav= GetDataFolder(1)
    String grfName= WinName(0, 1)
    SetDataFolder root:Packages:WMAxisSlider:$(grfName)

    NVAR gLeftLim,gRightLim
    SVAR gAxisName
    GetAxis/Q $gAxisName
    Variable dx= (V_max-V_min)/2
    Variable x0= value*(gRightLim-gLeftLim)+gLeftLim
    SetAxis $gAxisName,x0-dx,x0+dx
   
    SetDataFolder dfSav
           
    return 0    // other return values reserved
End


--Jim Prouty
Software Engineer, WaveMetrics, Inc.

July 9, 2015 at 04:49 pm - Permalink

JimProuty wrote:
You may be doing unnecessary work if Igor's Graph->Packages->Axis Slider is sufficient.

If not, you can look at that code to see how a slider can change a graph's axis range.

Function WMAxisSliderProc(name, value, event)
    String name // name of this slider control
    Variable value  // value of slider
    Variable event  // bit field: bit 0: value set; 1: mouse down, //   2: mouse up, 3: mouse moved

    String dfSav= GetDataFolder(1)
    String grfName= WinName(0, 1)
    SetDataFolder root:Packages:WMAxisSlider:$(grfName)

    NVAR gLeftLim,gRightLim
    SVAR gAxisName
    GetAxis/Q $gAxisName
    Variable dx= (V_max-V_min)/2
    Variable x0= value*(gRightLim-gLeftLim)+gLeftLim
    SetAxis $gAxisName,x0-dx,x0+dx
   
    SetDataFolder dfSav
           
    return 0    // other return values reserved
End


--Jim Prouty
Software Engineer, WaveMetrics, Inc.


Unless I misunderstood your solution I don't want to change the axis range but the number of wave data points that are displayed.

July 10, 2015 at 10:56 am - Permalink

johnweeks wrote:
You can use ReplaceWave to replace trace with another that is different only in the subrange. Try it first using the Replace Wave item from the Graph menu to see what the command looks like.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com


Thank you for the suggestion.
Here is what I got:
Window phase_space_graph() : Graph
    Variable/G start,stop
    PauseUpdate; Silent 1       // building window...
    start = 0
    stop =  DimSize(pos,0)
    display vel vs pos
    ControlBar 42
    Slider slider0 vert=0,proc=SliderProc,limits={0,DimSize(pos,0),0},size={300,63},ticks=0, variable=stop
    Slider slider1 vert=0,proc=SliderProc,limits={0,DimSize(pos,0),0},size={300,63},ticks=0, variable=start
EndMacro

Function SliderProc(ctrlName,sliderValue,event) : SliderControl
    String ctrlName
    Variable sliderValue
    Variable event  // bit field: bit 0: value set, 1: mouse down, 2: mouse up, 3: mouse moved
    wave pos,vel
    NVAR start,stop
    if (CmpStr(ctrlName,"slider0"))
        stop = sliderValue
    elseif (CmpStr(ctrlName, "slider1"))
        start = sliderValue
    endif
    if(event %& 0x1)    // bit 0, value set
        ReplaceWave trace= vel, vel[start,stop];DelayUpdate
        ReplaceWave/X trace= vel, pos[start,stop]
    endif
    return 0
End

However, both sliders become coupled for some reason. i.e changing one also changes the other at the same time.

EDIT:
Nevermind, I figured it out. CmpStr returns "False" if the strings are equal.

July 10, 2015 at 11:53 am - Permalink

igornoob12 wrote:

EDIT:
Nevermind, I figured it out. CmpStr returns "False" if the strings are equal.


Technically, CmpStr returns 0 (not "false") if the strings are equal.
It also returns -1 if the first string is lexically "less than" the second, and it returns +1 if greater.

--Jim Prouty
Software Engineer, WaveMetrics, Inc.

July 10, 2015 at 04:04 pm - Permalink

StringMatch has the expected behavior in the above code. The matching criteria is a bit loose, as case sensitivity and such is not included. But by using wildcards one can also write case switches for groups of controls.

July 13, 2015 at 12:20 am - Permalink