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## Copyright (C) 2012 Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
##
## 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/>.
## -*- texinfo -*-
## @deftypefn {Function File} @var{SVGn} = normalize (@var{SVG})
## normalizes and SVG.
## @end deftypefn
function [SVGn bb] = normalize (obj)
SVGn = obj;
bb = [];
if ! obj.Data.normalized
ids = fieldnames (obj.Path);
npath = numel(ids);
v = zeros(npath,2);
bb = zeros(1,4);
for ip = 1:npath
v(ip,:) = shapeCentroid(obj.Path.(ids{ip}).data);
p = shape2polygon(obj.Path.(ids{ip}).data);
bb = mergeBoxes(bb, [min(p) max(p)]([1 3 2 4]));
end
if npath > 1
v = mean(v)(:);
else
v = v.';
end
## check whether document and bounding box agree.
bbHeight = bb(2)-bb(1);
bbWidth = bb(4)-bb(2);
if obj.Data.height != bbHeight
warning("svg:normalize:Sanitycheck",...
["Height of SVG #g and height boundingbox #g don't match.\n" ...
"Using bounding box.\n"],obj.Data.height,bbHeight)
end
if obj.Data.width != bbWidth
warning("svg:normalize:Sanitycheck",...
["Width of SVG #g and width boundingbox #g don't match.\n" ...
"Using bounding box.\n"],obj.Data.width,bbWidth)
end
## Move paths such that center of SVG is at 0,0
## Put coordinates in the usual frame
## Scale such that diagonal of bounding box is 1
Dnorm = sqrt (bbWidth ^ 2 + bbHeight ^ 2);
S = (1 / Dnorm) * eye (2);
bb = zeros(1,4);
for ip = 1:npath
SVGn.Path.(ids{ip}).data = transformShape(obj.Path.(ids{ip}).data,-v);
# Put to middle
SVGn.Path.(ids{ip}).data = ...
transformShape(SVGn.Path.(ids{ip}).data,[0; -bbHeight/2]);
# Reflect y
SVGn.Path.(ids{ip}).data = ...
transformShape(SVGn.Path.(ids{ip}).data,[1 0;0 -1]);
# Put to bottom
SVGn.Path.(ids{ip}).data = ...
transformShape(SVGn.Path.(ids{ip}).data,[0; bbHeight/2]);
# Scale
SVGn.Path.(ids{ip}).data = ...
transformShape(SVGn.Path.(ids{ip}).data,S);
p = shape2polygon(SVGn.Path.(ids{ip}).data);
bb = mergeBoxes(bb, [min(p) max(p)]([1 3 2 4]));
end
bbHeight = bb(2)-bb(1);
bbWidth = bb(4)-bb(2);
SVGn.Data.height = bbHeight;
SVGn.Data.width = bbWidth;
SVGn.Data.normalized = true;
end
end
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