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65 lines
2.9 KiB
Matlab
65 lines
2.9 KiB
Matlab
% get_grid returns coordinate system for input shape ish and pixel size px
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%
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% Example:
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% [g1,g2] = get_grid(512, 29e-9);
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% returns an fft-shifted coordinate system of size 512x512 with a pixel size of 29 nm
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%*-----------------------------------------------------------------------*
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%| |
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%| Except where otherwise noted, this work is licensed under a |
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%| Creative Commons Attribution-NonCommercial-ShareAlike 4.0 |
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%| International (CC BY-NC-SA 4.0) license. |
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%| |
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%| Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch) |
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%| |
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%| Author: CXS group, PSI |
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%*-----------------------------------------------------------------------*
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% You may use this code with the following provisions:
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%
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% If the code is fully or partially redistributed, or rewritten in another
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% computing language this notice should be included in the redistribution.
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%
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% If this code, or subfunctions or parts of it, is used for research in a
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% publication or if it is fully or partially rewritten for another
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% computing language the authors and institution should be acknowledged
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% in written form in the publication: “Data processing was carried out
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% using the “cSAXS matlab package” developed by the CXS group,
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% Paul Scherrer Institut, Switzerland.”
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% Variations on the latter text can be incorporated upon discussion with
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% the CXS group if needed to more specifically reflect the use of the package
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% for the published work.
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%
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% A publication that focuses on describing features, or parameters, that
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% are already existing in the code should be first discussed with the
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% authors.
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%
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% This code and subroutines are part of a continuous development, they
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% are provided “as they are” without guarantees or liability on part
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% of PSI or the authors. It is the user responsibility to ensure its
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% proper use and the correctness of the results.
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function [gx,gy] = get_grid(ish, px)
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if length(ish) == 1
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sh = [ish ish];
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elseif length(ish) == 2
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sh = ish;
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else
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error('Input shape has to be 1D or 2D')
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end
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if length(px) == 1
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dx = [px px];
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elseif length(ish) ==2
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dx = px;
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else
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error('Pixel size has to be 1D or 2D')
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end
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x = fftshift(-sh(2)/2:floor((sh(2)-1)/2))*dx(2);
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y = fftshift(-sh(1)/2:floor((sh(1)-1)/2))*dx(1);
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[gx,gy] = meshgrid(x,y);
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end
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