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## Copyright (C) 2002-2012 Etienne Grossmann <etienne@egdn.net>
##
## 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/>.
## s = vrml_arrow (sz, col) - Arrow pointing in "y" direction
##
## INPUT :
## -------
## Arguments are optional. NaN's are replaced by default values.
## <default>
## sz = [len, alen, dc, dr] has size 1, 2, 3 or 4, where
##
## len : total length <1>
## alen : If positive: length of cone/total length <1/4>
## If negative: -(length of cone)
## dc : If positive: diameter of cone base/total len <1/16>
## If negative: -(diameter of cone)
## dr : If positive: diameter of rod/total length <min(dc, len/32)>
## If negative: -(diameter of rod)
##
## col : 3 or 3x2 : Color of body and cone <[0.3 0.4 0.9]>
##
## OUTPUT :
## --------
## s : string : vrml representation of an arrow (a rod and a cone)
function v = vrml_arrow (sz, col, emit)
if nargin < 3, emit = 1; end
if nargin<2 || isempty (col), col = [0.3 0.4 0.9;0.3 0.4 0.9];
elseif prod (size (col)) == 3, col = [1;1]*col(:)';
elseif all (size (col) == [3,2]), col = col';
elseif any (size (col) != [2,3]),
error("vrml_arrow : col has size %dx%d (should be 3 or 3x2)\n",size(col));
## keyboard
end
col = col' ;
s0 = [1, 1/4, 1/16, 1/32];
# Get absolute size
if nargin<1 || isempty (sz) || isnan (sz), sz = s0 ;
elseif length (sz) == 4, sz = [sz(1),sz(2),sz(3),sz(4)];
elseif length (sz) == 3, sz = [sz(1),sz(2),sz(3),s0(4)];
elseif length (sz) == 2, sz = [sz(1),sz(2),s0(3),s0(4)];
elseif length (sz) == 1, sz = [sz(1),s0(2),s0(3),s0(4)];
else
error ("vrml_arrow : sz has size %dx%d. (should be in 1-4)\n", size(sz));
## keyboard
end
assert (sz(1) > 0)
if !isempty (tmp = find(isnan(sz))), sz(tmp) = s0(tmp) ; end
for i = 2:4
if sz(i) >= 0
sz(i) *= sz(1);
else
sz(i) = -sz(i);
endif
endfor
# Do material nodes
smat1 = vrml_material (col(:,1), emit);
smat2 = vrml_material (col(:,2), emit);
v = sprintf (["Group {\n",...
" children [\n",...
" Transform {\n",...
" translation %8.3g %8.3g %8.3g\n",...
" children [\n",...
" Shape {\n",...
" appearance Appearance {\n",...
smat1,...
" }\n"...
" geometry Cylinder {\n",...
" radius %8.3g\n",...
" height %8.3g\n",...
" }\n",...
" }\n",...
" ]\n",...
" }\n",...
" Transform {\n",...
" translation %8.3g %8.3g %8.3g\n",...
" children [\n",...
" Shape {\n",...
" appearance Appearance {\n",...
smat2,...
" }\n",...
" geometry Cone { \n",...
" bottomRadius %8.3g \n",...
" height %8.3g\n",...
" }\n",...
" }\n",...
" ]\n",...
" }\n",...
" ]\n",...
"}\n"],...
[0,(sz(1)-sz(2))/2,0],...
sz(4),...
sz(1)-sz(2),...
[0,sz(2)/2+sz(1)-sz(2),0],...
sz(3),...
sz(2));
endfunction
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