| Re: Widget to play and pause image stack display [message #80154] |
Thu, 17 May 2012 07:51 |
Russell Ryan
Messages: 122
Registered: May 2012
|
Senior Member |
|
|
On May 11, 10:57 am, Helder <hel...@marchetto.de> wrote:
> On Thursday, May 10, 2012 6:40:11 PM UTC+2, Russell Ryan wrote:
>> On May 10, 12:35 pm, Russell Ryan <rr...@stsci.edu> wrote:
>>> On May 10, 10:24 am, Helder <hel...@marchetto.de> wrote:
>
>>>> Hi,
>>>> I would like to have a base widget with a draw widget where I play a movie (as in displaying a series of images from a stack).
>>>> I would like to have the typical two buttons that start the play of the movie and the pause button.
>>>> I'm not that good with widgets, but I can't thick of how I would be able to interrupt a loop that displays the images.
>>>> I would have had something like:
>
>>>> PauseButtonPressed = 0
>>>> ImgNr = 0
>>>> LoopInterval = 0.2
>>>> WHILE ~PauseButtonPressed THEN
>>>> TV, Image[ImgNr,*,*]
>>>> ImgNr++
>>>> IF ImgNr GT nImages THEN ImgNr = 0
>>>> WAIT, LoopInterval
>>>> ENDWHILE
>
>>>> Is there a way to check if the user has clicked something in the loop?
>
>>>> Thanks,
>>>> Helder
>
>>> Hi Helder
>>> Yeah, there is a way to do this....
>>> Here's a little example:
>
>>> pro timer_event,event
>>> widget_control,event.id,get_uval=uval
>
>>> case uval of
>>> 'START': begin
>>> widget_control,event.top,get_uval=state
>>> (*state).stop=0b
>>> widget_control,(*state).wtime,timer=(*state).time
>>> end
>>> 'RESTART': begin
>>> widget_control,event.top,get_uval=state
>>> (*state).iter=0L
>>> (*state).stop=0b
>>> widget_control,(*state).wtime,timer=(*state).time
>>> end
>>> 'STOP': begin
>>> widget_control,event.top,get_uval=state
>>> (*state).stop=1b
>>> end
>>> 'TIME': begin
>>> widget_control,event.top,get_uval=state
>
>>> ;your movie stuff here:
>>> n=50
>>> x=findgen(n)/(n-1)*2*!PI
>>> x+=(*state).iter*2*!PI/10.
>>> plot,x,sin(x)
>>> ;end of movie stuff
>
>>> ;more to end the loop
>>> if (*state).stop then return
>>> if ++(*state).iter gt (*state).maxiter then return
>>> widget_control,event.id,timer=(*state).time
>>> end
>
>>> 'DRAW':
>>> else:
>>> endcase
>>> end
>
>>> pro timer
>
>>> base=widget_base(/col)
>>> wtime=widget_base(base,uval='TIME')
>>> wdraw=widget_draw(base,xsize=200,ysize=200,uval='DRAW')
>>> wstart=widget_button(base,value='Start',uval='START')
>>> wrestart=widget_button(base,value='Restart',uval='RESTART')
>>> wstop=widget_button(base,value='Stop',uval='STOP')
>
>>> state={wdraw:wdraw,$
>>> wtime:wtime,$
>>> wstart:wstart,$
>>> wstop:wstop,$
>>> time:0.1,$
>>> stop:0b,$
>>> maxiter:100l,$
>>> iter:0l}
>>> state=ptr_new(state,/no_copy)
>>> widget_control,base,/realize,set_uval=state
>>> xmanager,'timer',base,/no_block
>
>>> end
>
>> I should have said, the speed of the animation is set by time (which
>> is in seconds). I set it to 0.1 by default (see the state
>> structure). The looping variable is iter and the maximum size (which
>> you don't necessarily need) is set by maxiter. You could change this
>> to be max runtime and keep track of the length of time the animation
>> has run, but that might get you in to trouble (like if the CPU slows
>> down because you're doing something else). But the magic is in the
>> widget_timer. My organization of the event_handler is probably not
>> ideal, but it is just a get-you-started example.
>
>> Good Luck,
>> Russell
>
> Dear Russell,
> that's great and works just fine for me. I wasn't aware of the keyword uvalue for widgets (well actually I was aware, but I just didn't know what the this was for!).
> I see that this can be set just to manage such loops.
>
> Again, thanks a lot for your help. Really appreciated.
>
> Cheers, Helder
HI Helder,
Yeah, I wasn't sure what the uvalue was useful for on the widgets. I
took this approach after dissecting several GUIs written by ITT/RSI.
Though, after a bit of soul-searching, I wonder if it wouldn't be
better to use the uname keyword for this purpose, since you can set
the uvalue to any datatype and uname can only be a string. That way,
you can actually store some data (such as a structure or pointer) in
the uvalue.... Maybe someone can tell me why that's a foolish thing
to do...
R
PS. The way I organize the event handlers is to have a set of nested
case statements. The first will test which type of event it was:
WIDGET_BUTTON, WIDGET_DRAW, WIDGET_TEXT_DEL, etc. Then process each
widget within that case (with essentially this stuff). I feel like
that will be more efficient, since I find that for certain events
(like WIDGET_TEXT) I'm always needing to do a few things (like get the
state pointer), whereas with WIDGET_DRAW or WIDGET_BUTTON I don't
always need it... Plus, you can easily process things like resizing
the main window or closing the program (by the little red X in Windows
or the red circle in OS X).
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| Re: Widget to play and pause image stack display [message #80185 is a reply to message #80154] |
Fri, 11 May 2012 07:57  |
Helder Marchetto
Messages: 520
Registered: November 2011
|
Senior Member |
|
|
On Thursday, May 10, 2012 6:40:11 PM UTC+2, Russell Ryan wrote:
> On May 10, 12:35 pm, Russell Ryan <rr...@stsci.edu> wrote:
>> On May 10, 10:24 am, Helder <hel...@marchetto.de> wrote:
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>> Hi,
>>> I would like to have a base widget with a draw widget where I play a movie (as in displaying a series of images from a stack).
>>> I would like to have the typical two buttons that start the play of the movie and the pause button.
>>> I'm not that good with widgets, but I can't thick of how I would be able to interrupt a loop that displays the images.
>>> I would have had something like:
>>
>>> PauseButtonPressed = 0
>>> ImgNr = 0
>>> LoopInterval = 0.2
>>> WHILE ~PauseButtonPressed THEN
>>> TV, Image[ImgNr,*,*]
>>> ImgNr++
>>> IF ImgNr GT nImages THEN ImgNr = 0
>>> WAIT, LoopInterval
>>> ENDWHILE
>>
>>> Is there a way to check if the user has clicked something in the loop?
>>
>>> Thanks,
>>> Helder
>>
>> Hi Helder
>> Yeah, there is a way to do this....
>> Here's a little example:
>>
>> pro timer_event,event
>> widget_control,event.id,get_uval=uval
>>
>> case uval of
>> 'START': begin
>> widget_control,event.top,get_uval=state
>> (*state).stop=0b
>> widget_control,(*state).wtime,timer=(*state).time
>> end
>> 'RESTART': begin
>> widget_control,event.top,get_uval=state
>> (*state).iter=0L
>> (*state).stop=0b
>> widget_control,(*state).wtime,timer=(*state).time
>> end
>> 'STOP': begin
>> widget_control,event.top,get_uval=state
>> (*state).stop=1b
>> end
>> 'TIME': begin
>> widget_control,event.top,get_uval=state
>>
>> ;your movie stuff here:
>> n=50
>> x=findgen(n)/(n-1)*2*!PI
>> x+=(*state).iter*2*!PI/10.
>> plot,x,sin(x)
>> ;end of movie stuff
>>
>> ;more to end the loop
>> if (*state).stop then return
>> if ++(*state).iter gt (*state).maxiter then return
>> widget_control,event.id,timer=(*state).time
>> end
>>
>> 'DRAW':
>> else:
>> endcase
>> end
>>
>> pro timer
>>
>> base=widget_base(/col)
>> wtime=widget_base(base,uval='TIME')
>> wdraw=widget_draw(base,xsize=200,ysize=200,uval='DRAW')
>> wstart=widget_button(base,value='Start',uval='START')
>> wrestart=widget_button(base,value='Restart',uval='RESTART')
>> wstop=widget_button(base,value='Stop',uval='STOP')
>>
>> state={wdraw:wdraw,$
>> wtime:wtime,$
>> wstart:wstart,$
>> wstop:wstop,$
>> time:0.1,$
>> stop:0b,$
>> maxiter:100l,$
>> iter:0l}
>> state=ptr_new(state,/no_copy)
>> widget_control,base,/realize,set_uval=state
>> xmanager,'timer',base,/no_block
>>
>> end
>
> I should have said, the speed of the animation is set by time (which
> is in seconds). I set it to 0.1 by default (see the state
> structure). The looping variable is iter and the maximum size (which
> you don't necessarily need) is set by maxiter. You could change this
> to be max runtime and keep track of the length of time the animation
> has run, but that might get you in to trouble (like if the CPU slows
> down because you're doing something else). But the magic is in the
> widget_timer. My organization of the event_handler is probably not
> ideal, but it is just a get-you-started example.
>
> Good Luck,
> Russell
Dear Russell,
that's great and works just fine for me. I wasn't aware of the keyword uvalue for widgets (well actually I was aware, but I just didn't know what the this was for!).
I see that this can be set just to manage such loops.
Again, thanks a lot for your help. Really appreciated.
Cheers, Helder
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| Re: Widget to play and pause image stack display [message #80192 is a reply to message #80185] |
Thu, 10 May 2012 09:40 |
Russell Ryan
Messages: 122
Registered: May 2012
|
Senior Member |
|
|
On May 10, 12:35 pm, Russell Ryan <rr...@stsci.edu> wrote:
> On May 10, 10:24 am, Helder <hel...@marchetto.de> wrote:
>
>
>
>
>
>
>
>
>
>> Hi,
>> I would like to have a base widget with a draw widget where I play a movie (as in displaying a series of images from a stack).
>> I would like to have the typical two buttons that start the play of the movie and the pause button.
>> I'm not that good with widgets, but I can't thick of how I would be able to interrupt a loop that displays the images.
>> I would have had something like:
>
>> PauseButtonPressed = 0
>> ImgNr = 0
>> LoopInterval = 0.2
>> WHILE ~PauseButtonPressed THEN
>> TV, Image[ImgNr,*,*]
>> ImgNr++
>> IF ImgNr GT nImages THEN ImgNr = 0
>> WAIT, LoopInterval
>> ENDWHILE
>
>> Is there a way to check if the user has clicked something in the loop?
>
>> Thanks,
>> Helder
>
> Hi Helder
> Yeah, there is a way to do this....
> Here's a little example:
>
> pro timer_event,event
> widget_control,event.id,get_uval=uval
>
> case uval of
> 'START': begin
> widget_control,event.top,get_uval=state
> (*state).stop=0b
> widget_control,(*state).wtime,timer=(*state).time
> end
> 'RESTART': begin
> widget_control,event.top,get_uval=state
> (*state).iter=0L
> (*state).stop=0b
> widget_control,(*state).wtime,timer=(*state).time
> end
> 'STOP': begin
> widget_control,event.top,get_uval=state
> (*state).stop=1b
> end
> 'TIME': begin
> widget_control,event.top,get_uval=state
>
> ;your movie stuff here:
> n=50
> x=findgen(n)/(n-1)*2*!PI
> x+=(*state).iter*2*!PI/10.
> plot,x,sin(x)
> ;end of movie stuff
>
> ;more to end the loop
> if (*state).stop then return
> if ++(*state).iter gt (*state).maxiter then return
> widget_control,event.id,timer=(*state).time
> end
>
> 'DRAW':
> else:
> endcase
> end
>
> pro timer
>
> base=widget_base(/col)
> wtime=widget_base(base,uval='TIME')
> wdraw=widget_draw(base,xsize=200,ysize=200,uval='DRAW')
> wstart=widget_button(base,value='Start',uval='START')
> wrestart=widget_button(base,value='Restart',uval='RESTART')
> wstop=widget_button(base,value='Stop',uval='STOP')
>
> state={wdraw:wdraw,$
> wtime:wtime,$
> wstart:wstart,$
> wstop:wstop,$
> time:0.1,$
> stop:0b,$
> maxiter:100l,$
> iter:0l}
> state=ptr_new(state,/no_copy)
> widget_control,base,/realize,set_uval=state
> xmanager,'timer',base,/no_block
>
> end
I should have said, the speed of the animation is set by time (which
is in seconds). I set it to 0.1 by default (see the state
structure). The looping variable is iter and the maximum size (which
you don't necessarily need) is set by maxiter. You could change this
to be max runtime and keep track of the length of time the animation
has run, but that might get you in to trouble (like if the CPU slows
down because you're doing something else). But the magic is in the
widget_timer. My organization of the event_handler is probably not
ideal, but it is just a get-you-started example.
Good Luck,
Russell
|
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|
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| Re: Widget to play and pause image stack display [message #80194 is a reply to message #80192] |
Thu, 10 May 2012 09:35 |
Russell Ryan
Messages: 122
Registered: May 2012
|
Senior Member |
|
|
On May 10, 10:24 am, Helder <hel...@marchetto.de> wrote:
> Hi,
> I would like to have a base widget with a draw widget where I play a movie (as in displaying a series of images from a stack).
> I would like to have the typical two buttons that start the play of the movie and the pause button.
> I'm not that good with widgets, but I can't thick of how I would be able to interrupt a loop that displays the images.
> I would have had something like:
>
> PauseButtonPressed = 0
> ImgNr = 0
> LoopInterval = 0.2
> WHILE ~PauseButtonPressed THEN
> TV, Image[ImgNr,*,*]
> ImgNr++
> IF ImgNr GT nImages THEN ImgNr = 0
> WAIT, LoopInterval
> ENDWHILE
>
> Is there a way to check if the user has clicked something in the loop?
>
> Thanks,
> Helder
Hi Helder
Yeah, there is a way to do this....
Here's a little example:
pro timer_event,event
widget_control,event.id,get_uval=uval
case uval of
'START': begin
widget_control,event.top,get_uval=state
(*state).stop=0b
widget_control,(*state).wtime,timer=(*state).time
end
'RESTART': begin
widget_control,event.top,get_uval=state
(*state).iter=0L
(*state).stop=0b
widget_control,(*state).wtime,timer=(*state).time
end
'STOP': begin
widget_control,event.top,get_uval=state
(*state).stop=1b
end
'TIME': begin
widget_control,event.top,get_uval=state
;your movie stuff here:
n=50
x=findgen(n)/(n-1)*2*!PI
x+=(*state).iter*2*!PI/10.
plot,x,sin(x)
;end of movie stuff
;more to end the loop
if (*state).stop then return
if ++(*state).iter gt (*state).maxiter then return
widget_control,event.id,timer=(*state).time
end
'DRAW':
else:
endcase
end
pro timer
base=widget_base(/col)
wtime=widget_base(base,uval='TIME')
wdraw=widget_draw(base,xsize=200,ysize=200,uval='DRAW')
wstart=widget_button(base,value='Start',uval='START')
wrestart=widget_button(base,value='Restart',uval='RESTART')
wstop=widget_button(base,value='Stop',uval='STOP')
state={wdraw:wdraw,$
wtime:wtime,$
wstart:wstart,$
wstop:wstop,$
time:0.1,$
stop:0b,$
maxiter:100l,$
iter:0l}
state=ptr_new(state,/no_copy)
widget_control,base,/realize,set_uval=state
xmanager,'timer',base,/no_block
end
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