| IDLgrWindow zoomIn bug? [message #59697] |
Mon, 07 April 2008 04:03  |
![Erik[1] is currently offline](theme/default/images/xoffline.png.pagespeed.ic.XRkd1fkXye.png "Erik[1] is currently offline")
Erik[1]
Messages: 23
Registered: December 2006
|
Junior Member |
|
|
Hi Folks,
I have a problem using the ZoomIn function from the IDLgrWindow object
in IDL 6.3. According to the IDL help file I expected the following to
happen:
---
The IDLgrWindow::ZoomIn procedure method causes the current zoom
factor for this window to be increased (that is, multiplied by the
factor given by the window's ZOOM_BASE property). The current zoom
factor, the virtual canvas dimensions, and the location of the visible
portion of the window are updated to reflect the new zoom factor.
---
I already wrote some code to do the job for me, but what it doesn't do
is update the Roi's in the zoomed area. I thought this function could
help me out, but unfortunately I got some strange results. I use the
following code to zoom at a mouseclick (self.View is added to
self.Window);
self.Window->setProperty, ZOOM_BASE=2.0
self.Window->zoomIn
self.Window->Draw, self.View
self.Window->getProperty, Current_Zoom=cz, ZOOM_NSTEP=nstep
print, nstep
print, cz
What happens is that nstep and cz are updated as expected. On the
first zoom, the coordinates of the drawwidget suddenly changes to 0,0
so the drawwidget moves on my widget to the upper left corner... When
I click once more, the drawwidget jumps back to it's original position
again, and luckily stays there. Very strange... But even worse; there
is absolutely no zoom effect to be found in the drawwidget!
Given the fact this function is introduced in IDL 6.1 I expected it to
be functional in 6.3 (or is this too optimistical? ;-) ). Anyway I
would love to hear that this is my fault and not a bug, because this
function will be very useful!
Regards,
Erik
|
|
|
|
| Re: IDLgrWindow zoomIn bug? [message #59744 is a reply to message #59697] |
Wed, 09 April 2008 03:29  |
Erik[1]
Messages: 23
Registered: December 2006
|
Junior Member |
|
|
On 8 apr, 17:47, Rick Towler <rick.tow...@nomail.noaa.gov> wrote:
> Erik wrote:
>> On 8 apr, 06:02, David Fanning wrote:
>>> I've never used the ZoomIn/ZoomOut features before. But
>>> I just put it into a program that was zooming in a different
>>> way. For me, when I zoom in, the draw widget gets twice its
>>> current size!! Zoom out, it shrinks down again.
>
>>> I don't know about you, but that is not what I expected
>>> at all. (IDL 6.4 on Windows). I was sort of hoping the
>>> view would zoom in and out. Why would you want the draw
>>> widget changing size!?
>> Wow that isn't what I expected either and I was hoping the same thing
>> as you! I can't check it in 6.4, but in 6.3 it didn't work that way.
>> Well, it seems that I have to continue writing my own zoom code and
>> that it wasn't a waste of time writing it. Only some minor issues I
>> have to face (like re-drawing the ROI's in the same proportion as the
>> zoomed image) ;-)
>
> Erik, How are you zooming? I never use ROI's, but I would think that
> if you are zooming by changing your viewplane rectangle that the ROI's
> would "zoom" too. Here's the zoom method from my camera code:
>
> pro Camera::Zoom, zoom
> ; Zoom the camera view by the specified zoom factor.
>
> compile_opt idl2
>
> if (N_ELEMENTS(zoom) eq 1) then begin
> case 1 of
> (zoom lt -1.0) : self.zoom = (-1.0D / zoom)
> (zoom gt 1.0) : self.zoom = zoom
> else : self.zoom = 1.0D
> endcase
>
> viewplaneRect = dblarr(4, /NOZERO)
> viewplaneRect[0:1] = self.viewcoord[0:1] - $
> (self.viewRect[2:3] / (2.0D * self.zoom))
> viewplaneRect[2:3] = self.viewRect[2:3] / self.zoom
>
> self -> IDLgrView::SetProperty, VIEWPLANE_RECT= viewplaneRect
> endif
>
> end
>
> Set up the vars that store the initial state once, after you have set up
> your initial view:
>
> self -> IDLgrView::GetProperty, VIEWPLANE_RECT=viewplaneRect
> self.viewRect = viewplaneRect
> self.viewcoord[0] = ((2. * self.viewRect[0]) + $
> self.viewRect[2]) / 2.
> self.viewcoord[1] = ((2. * self.viewRect[1]) + $
> self.viewRect[3]) / 2.
>
> -Rick
Hi Rick,
Thank you very much! Altering the viewplane_rect property does the
trick for me. Great!
Regards,
Erik
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
