On Tue, Sep 16, 2014 at 11:42:19AM +0200, Mathias Müller wrote:
> Honestly, I am kind of distressed. I do exactly the same. The image is
> of cause centered, but when extracting coordinates of the image center
> or the edges than it simple does not fit to what I get in the
> fft-module.
>
> when reading the data point from selection, could there be some wrong usage?
I'm sorry, I didn't work with this part of Gwyddion code for some
time... Selections are *NOT* offset. They have origin in the top-left
corner, like pixel coordinates, just scaled to the physical scale. You
have to add the offsets yourself:
sel[0] += gwy_data_field_get_xoffset(data_field);
sel[1] += gwy_data_field_get_yoffset(data_field);
This is, again, for compatibility reasons because offsets were a kind of
afterthought.
Regards,
Yeti
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