visualpython-users

Re: [Visualpython-users] Keeping labels in one place

[Kadir H. <kha...@ya...>]

I am not sure if I have misunderstood your  requirement with oversimplification, 
or if this helps:

LABEL  object itself should provide what you want.

If you place the  label at pos = scene.center, then mouse operations (zoom, 
rotate, etc.)  will not affect the label position. It will stay at the center of 
the  screen.

You may not wish to have the label at the center, as you  may prefer to have 
your prime object at the center. Then, you can use  xoffset, yoffset parameters 
to shift the label on the screen which are  in pixel coordinates, not in space 
coordinates.

So, pos =  scene.center and the use of xoffset and yoffset serves as positioning  
the label on the screen with absolute pixel coordinates.

For  example, you can try the following simple code:

#  ==============
from visual import *

scene.center = (1,2,3)

plane  = pyramid(pos=(1,1,1), size=(2,1,3))

tlabel =  label(pos=scene.center, xoffset=0, yoffset=-100, line=0, text="TIME")
slabel  = label(pos=scene.center, xoffset=100, yoffset=-100, line=0,  
text="SPEED")
glabel = label(pos=scene.center, xoffset=-100,  yoffset=-100, line=0, 
text="GFORCE")

t = 0
while 1:

     plane.pos -= (plane.pos.x, plane.pos.y, t)
    t += 0.001
     plane.rotate(axis=(0,0,1), angle=pi/64)
    rate(25)



Was this what you needed?

Kadir


________________________________
From: Robert French <rf...@rf...>
To: C Anthony Risinger  <an...@ex...>
Cc: "vis...@li..."  
<vis...@li...>
Sent: Sun, July 18, 2010 2:09:21  AM
Subject: Re:  [Visualpython-users] Keeping labels in one place

Yes, C Anthony is correct. I want it to stay at an absolute pixel  coordinate 
(2-D) in the window. Completely unaffected by any rotations  or zooms.  The 
existing objects all move with the frame. 


I had  thought about the constantly-reposition option but was hoping there was  
something easier.  This seems like it would be a common desire. For  example, to 
put a title or timestamp or something in the display window.

I'll  try those suggestions and see if I can get it to work

BTW, my  application is orbit visualization of spacecraft. I just want the date  
and time to stay in one place.

Thanks.  

On Jul 17, 2010,  at 11:20 AM, C Anthony Risinger <an...@ex...> wrote:

> 
> 
> On Sat, Jul 17, 2010 at 1:07 PM, Bruce Sherwood <bas...@nc...> wrote:
>>  The current version of VPython (5.32) offers a text object as well as a
>>  label object. The label object always faces the viewer, independent of
>>  rotation, whereas the (new) text object is extruded text that behaves  like
>> all other objects. Seems like one of these two should  do what you want. The
>> text object can have zero thickness.
>>  I'm not sure what you mean by a "time" display, but presumably you know
>>  about the graphing option.
>> Bruce Sherwood
> 
> i  think what the OP is looking for is HUD functionality, ie. the
>  "time" display stays locked to the viewport, regardless of zoom or
>  rotation.
> 
> AFIAK this is not currently supported in  vpython.  however, the same
> effect can be achieved by using a  "HUD frame" and constantly
> recomputing it's  position/zoom/rotation as the main frame moves.  the
> other  option is to put your app into a "container" frame, and ensure
>  the main frame never moves... anything added to the main frame is a
>  part of the HUD; i think the issue with this was mouse grabs are sent
>  to the main frame (IIRC).  sorry, i don't have any code examples on
>  hand :-(
> 
> C Anthony
> 
>  
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Re: [Visualpython-users] Keeping labels in one place

[Roberto S. <rsa...@bo...>]

You could also update the text in the titlebar with scene.title.

Rob

Re: [Visualpython-users] Keeping labels in one place

[Robert F. <rf...@rf...>]

Brilliant!  I should've figured that one out myself.  Thanks, it will
handle my needs for now.

Also thanks to Symion for a different approach, which I have also learned
a lot from.

Rob

On Sun, 18 Jul 2010 01:08:02 -0700 (PDT), Kadir Haldenbilen
<kha...@ya...> wrote:
> I am not sure if I have misunderstood your  requirement with
> oversimplification, 
> or if this helps:
> 
> LABEL  object itself should provide what you want.
> 
> If you place the  label at pos = scene.center, then mouse operations
> (zoom, 
> rotate, etc.)  will not affect the label position. It will stay at the
> center of 
> the  screen.
> 
> You may not wish to have the label at the center, as you  may prefer to
> have 
> your prime object at the center. Then, you can use  xoffset, yoffset
> parameters 
> to shift the label on the screen which are  in pixel coordinates, not in
> space 
> coordinates.
> 
> So, pos =  scene.center and the use of xoffset and yoffset serves as
> positioning  
> the label on the screen with absolute pixel coordinates.
> 
> For  example, you can try the following simple code:
> 
> #  ==============
> from visual import *
> 
> scene.center = (1,2,3)
> 
> plane  = pyramid(pos=(1,1,1), size=(2,1,3))
> 
> tlabel =  label(pos=scene.center, xoffset=0, yoffset=-100, line=0,
> text="TIME")
> slabel  = label(pos=scene.center, xoffset=100, yoffset=-100, line=0,  
> text="SPEED")
> glabel = label(pos=scene.center, xoffset=-100,  yoffset=-100, line=0, 
> text="GFORCE")
> 
> t = 0
> while 1:
> 
>      plane.pos -= (plane.pos.x, plane.pos.y, t)
>     t += 0.001
>      plane.rotate(axis=(0,0,1), angle=pi/64)
>     rate(25)
> 
> 
> 
> Was this what you needed?
> 
> Kadir
> 
> 
> ________________________________
> From: Robert French <rf...@rf...>
> To: C Anthony Risinger  <an...@ex...>
> Cc: "vis...@li..."  
> <vis...@li...>
> Sent: Sun, July 18, 2010 2:09:21  AM
> Subject: Re:  [Visualpython-users] Keeping labels in one place
> 
> Yes, C Anthony is correct. I want it to stay at an absolute pixel 
> coordinate 
> (2-D) in the window. Completely unaffected by any rotations  or zooms. 
> The 
> existing objects all move with the frame. 
> 
> 
> I had  thought about the constantly-reposition option but was hoping
there
> was  
> something easier.  This seems like it would be a common desire. For 
> example, to 
> put a title or timestamp or something in the display window.
> 
> I'll  try those suggestions and see if I can get it to work
> 
> BTW, my  application is orbit visualization of spacecraft. I just want
the
> date  
> and time to stay in one place.
> 
> Thanks.  
> 
> On Jul 17, 2010,  at 11:20 AM, C Anthony Risinger <an...@ex...>
wrote:
> 
>> 
>> 
>> On Sat, Jul 17, 2010 at 1:07 PM, Bruce Sherwood <bas...@nc...>
>> wrote:
>>>  The current version of VPython (5.32) offers a text object as well as
a
>>>  label object. The label object always faces the viewer, independent
of
>>>  rotation, whereas the (new) text object is extruded text that behaves

>>>  like
>>> all other objects. Seems like one of these two should  do what you
>>> want. The
>>> text object can have zero thickness.
>>>  I'm not sure what you mean by a "time" display, but presumably you
know
>>>  about the graphing option.
>>> Bruce Sherwood
>> 
>> i  think what the OP is looking for is HUD functionality, ie. the
>>  "time" display stays locked to the viewport, regardless of zoom or
>>  rotation.
>> 
>> AFIAK this is not currently supported in  vpython.  however, the same
>> effect can be achieved by using a  "HUD frame" and constantly
>> recomputing it's  position/zoom/rotation as the main frame moves.  the
>> other  option is to put your app into a "container" frame, and ensure
>>  the main frame never moves... anything added to the main frame is a
>>  part of the HUD; i think the issue with this was mouse grabs are sent
>>  to the main frame (IIRC).  sorry, i don't have any code examples on
>>  hand :-(
>> 
>> C Anthony
>> 
>>  
>
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>> Vis...@li...
>> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>> 
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> 
>
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