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## Copyright (C) 2017-2019 Philip Nienhuis
##
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/>.
function [opol, xy_mean, xy_magn] = __dbl2int64__ (inpoly, clippoly=[], xy_mean=[], xy_magn=[])
if (isempty (clippoly))
clippoly = zeros (0, size (inpoly, 2));
endif
if (isempty (xy_mean))
## Convert & scale to int64 (that's what Clipper works with)
## Find (X, Y) translation
xy_mean = mean ([inpoly; clippoly] (isfinite ([inpoly; clippoly](:, 1)), :));
## Find (X, Y) magnitude
xy_magn = max ([inpoly; clippoly] (isfinite ([inpoly; clippoly](:, 1)), :)) ...
- min ([inpoly; clippoly] (isfinite ([inpoly; clippoly](:, 1)), :));
## Apply (X,Y) multiplication (floor (log10 (intmax ("int64"))) = 18)
xy_magn = 10^(17 - ceil (max (log10 (xy_magn))));
endif
## Scale inpoly coordinates to optimally use int64
inpoly(:, 1:2) -= xy_mean;
inpoly *= xy_magn;
idin = [ 0 find(isnan (inpoly (:, 1)))' numel(inpoly (:, 1))+1 ];
## Provisional preallocation. npolx is average nr. of vertices per polygon
npolx = fix (size (inpoly, 1) / numel (idin)-1);
npoly = size (inpoly, 2);
opol = repmat (struct ("x", zeros (npolx, npoly), "y", zeros (npolx, npoly)), ...
1, numel(idin) - 1);
for ii=1:numel (idin) - 1
opol(ii).x = int64 (inpoly(idin(ii)+1:idin(ii+1)-1, 1));
opol(ii).y = int64 (inpoly(idin(ii)+1:idin(ii+1)-1, 2));
endfor
endfunction
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