Nice job Jukka.
We have "New Affine Transformation" plugin, for geometries, that might be
useful to calculate some of the parameters (ex rotations) including scaling
(if we want to explore JAI warp/affine parameters)

Peppe


2013/9/30 <edgar.sol...@web.de>

> On 30.09.2013 15:50, Rahkonen Jukka wrote:
> >
> > edgar.sol...@web.de [mailto:edgar.sol...@web.de]
> >
> >
> >> A. what center is it rotated around?
> >> B. how would i calculate the angle from the WF values? sorry, my
> trigonometry
> >> went to by cigarettes long time ago.
> >
> > Image is rotated around the top left corner of the top left pixel. I
> spent some time with OpenOffice Calc and the result is attached. The spread
> sheet should create a valid world file from parameters and calculate back
> the pixels and rotations in the opposite way. I hope I understood it right.
> I wonder why ESRI has not published something like this. Please check if
> the formulas make sense to you.
> >
>
> nifty... this should at least allow placing from world file w/ rotation
> parameters.
>
> for manual placement via geometry i will probably resort to bruteforce
> warping the picture within it's 4 corners, if i get it to work at all.
> additionally we could use the ImgLayerMgr
>  "Reset Placement" (to original georeference or 0,0 default) and
>  "Place Manually" (bbox or even better 4 coordinates for the corners and
> rotation angle, analogous to wld file data)
> buttons
> the second will be probably some work (gui design, pfhhhh). so i'll
> probably not realize it for now.
>
> thx.. ede
>
>
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