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vrml_cyl.m    147 lines (124 with data), 4.0 kB

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## Copyright (C) 2002 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_cyl(x,...)
##
## Makes a cylinder that links x(:,1) to x(:,2)
##
## Options :
##
## "tran", transparency : Transparency default = 0
## "col" , col : Color default = [ 0.3 0.4 0.9 ]
## "rad" , radius : Radius of segments default = 0.05
## "balls" : Add balls to extremities
## "brad" : Radius of balls default = rad
## "emit", bool : Use or not emissiveColor
## "noemit" : Same as emit,0
## "arrow" : Last segment is an arrow
## "hcol", hcol : Set color of the head of the arrow.
## default = col
function s = vrml_cyl (x,varargin) # pos 2.1.39
rad = 0.05 ;
tran = 0 ;
col = [0.3;0.4;0.9] ;
hcol = nan;
brad = nan;
verbose = 0 ;
balls = 0 ;
emit = 0;
noemit = nan;
arrow = 0;
if nargin > 1
op1 = " rad tran col hcol brad emit " ;
op0 = " verbose balls noemit arrow " ;
df = tars (rad, tran, col, hcol, verbose, balls, noemit, arrow, brad, ...
emit);
s = read_options (varargin, "op1",op1,"op0",op0, "default",df); # pos 2.1.39
rad= s.rad;
tran= s.tran;
col= s.col;
hcol= s.hcol;
emit= s.emit;
verbose= s.verbose;
balls= s.balls;
noemit= s.noemit;
arrow= s.arrow;
brad= s.brad;
end
if isnan (brad), brad = rad; end
if !isnan (noemit), emit = ! noemit; end
if !isnan (hcol), arrow = 1; end
s = "" ;
N = columns (x);
# Make col 3xN
if prod (size (col)) == 3, col = col(:); col = col(:, ones(1,N)); end
if emit, emitcol = col; else emitcol = nan(1,N); end
if prod (size (tran)) == 1, tran = tran(ones(1,N)); end
tran(find (tran==0)) = nan ;
for i = 2:N
d = x(:,i)-x(:,i-1) ;
n = norm(d) ;
if n,
d = d/n ;
ax = cross([0,1,0],d') ;
an = norm (ax) ;
if abs(an)>eps, ax = ax/an ; else ax = [1,0,0] ; end
an = acos(d(2)) ;
t = mean (x(:,[i,i-1])')' ;
if ! arrow || i != N
smat = vrml_material (col(:,i-1), emitcol(:,i-1), tran(i-1));
# Do a cylinder
s = [s,sprintf(["Transform {\n",...
" translation %8.3f %8.3f %8.3f\n",...
" children [\n",...
" Transform {\n",...
" rotation %8.3f %8.3f %8.3f %8.3f\n",...
" children [\n",...
" Shape {\n",...
" appearance Appearance {\n",...
" %s",...
" }\n",...
" geometry Cylinder {\n",...
" height %8.3f\n",...
" radius %8.3f\n",...
" }\n",...
" }\n",...
" ]\n",...
" }\n",...
" ]\n",...
"}\n"],...
t,...
ax,an,...
smat,...
n,...
rad)];
else
t = x(:,i-1) ;
if isnan (hcol), hcol = col(:,i); end
arrowcol = [col(:,i) hcol(1:3)(:)];
s = [s,...
vrml_transfo(vrml_arrow ([n,nan,2*rad/n,rad/n],arrowcol,emit),...
t, ax*an)];
end
end
end
if balls,
## "balls on"
s = [s, vrml_points(x,"balls","col",col, "rad",brad,"emit",emit)];
elseif columns(x)>2,
# Make a rounded junction
s = [s, vrml_points(x(:,2:columns(x)-1),"balls","col",col,"rad",rad, ...
"emit", emit)];
end
endfunction