| Re: IDLgrWindow zoomIn bug? [message #59766 is a reply to message #59679] |
Tue, 08 April 2008 08:47  |
Rick Towler
Messages: 821
Registered: August 1998
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Senior Member |
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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
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