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## Copyright (C) 2010 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_Viewpoint (...) - Vrml Viewpoint node
##
## s is a string of the form :
## ------------------------------------------------------------------
## Viewpoint {
## eventIn SFBool set_bind
## exposedField SFFloat fieldOfView 0.785398 # (0,pi)
## exposedField SFBool jump TRUE
## exposedField SFRotation orientation 0 0 1 0 # [-1,1],(-pi,pi)
## exposedField SFVec3f position 0 0 10 # (-,)
## field SFString description ""
## eventOut SFTime bindTime
## eventOut SFBool isBound
## }
## ------------------------------------------------------------------
##
## Options :
## All the fields of the node
##
## Example : s = vrml_Viewpoint ("location",[0 0 1]);
##
## See also : vrml_DirectionalLight
function s = vrml_Viewpoint (varargin)
if mod(nargin,2) != 0, print_usage; end
h = struct (varargin{:});
tpl = struct ("fieldOfView", "%8.3f",...
"jump", "%s",...
"orientation", "%8.3f %8.3f %8.3f %8.3f",...
"orientation0", "%8.3f %8.3f %8.3f %8.3f",...
"position", "%8.3f %8.3f %8.3f",...
"description", "\"%s\"",...
"DEF", "");
DEF = "";
defaultPos = [0 0 10];
for [val,key] = h
if ! isfield (tpl, key)
error (sprintf ("vrml_Viewpoint : unknown field '%s'",key));
end
end
if isfield (h, "DEF")
DEF = h.DEF;
h = rmfield (h, "DEF");
end
if isfield (h, "orientation0")
o = h.orientation0;
if numel (o) == 3
o = [o(:)'/norm(o), norm(o)];
elseif numel (o) == 4
o(4) = sign(o(4)) * rem (abs (o(4)), pi);
o = [o(1:3)(:)'/norm(o(1:3)), o(4)];
else
error ("Option 'orientation0' has size %i, should be 3 or 4", numel(o));
endif
if isfield (h, "position")
p = h.position(:);
else
p = defaultPos(:);
end
h = rmfield (h, "orientation0");
h.orientation = o;
h.position = rotv (o(1:3), o(4))' * p;
elseif isfield (h, "orientation")
o = h.orientation;
if numel (o) == 3
o = [o(:)'/norm(o), norm(o)];
elseif numel (o) == 4
o(4) = sign(o(4)) * rem (abs (o(4)), pi);
o = [o(1:3)(:)'/norm(o(1:3)), o(4)];
else
error ("Option 'orientation' has size %i, should be 3 or 4", numel(o));
endif
h.orientation = o;
end
if isfield (h, "position") && numel (h.position) != 3
error ("Option 'position' has size %i, should be 3", numel (h.position));
endif
if isfield (h, "jump")
if h.jump
h.jump = "TRUE";
else
h.jump = "FALSE";
endif
endif
body = "";
for [val, key] = h
body = [body,...
sprintf(" %-20s %s\n",key, ...
sprintf (getfield (tpl,key), val))];
end
s = sprintf ("Viewpoint {\n%s}\n", body);
if !isempty (DEF)
s = ["DEF ", DEF," ",s];
end
endfunction
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