Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / vrml-1.0.13 / vrml_Background.m

diff --git a/octave_packages/vrml-1.0.13/vrml_Background.m b/octave_packages/vrml-1.0.13/vrml_Background.m
new file mode 100644 (file)
index 0000000..d57eaee
--- /dev/null
+++ b/octave_packages/vrml-1.0.13/vrml_Background.m
@@ -0,0 +1,84 @@
+## 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_Background (...)   - Vrml Background node
+##  
+##  s is a string of the form :
+##  ------------------------------------------------------------------
+##  Background { 
+##    skyColor          [0 0 0]
+##    skyAngle          [0]   
+##    groundColor       [0 0 0]   
+##    groundangle       [0]   
+##    backUrl           ""
+##    bottomUrl         ""
+##    frontUrl          ""
+##    leftUrl           ""
+##    rightUrl          ""
+##    topUrl            ""
+##  }
+##  ------------------------------------------------------------------
+##
+## Options :
+## All the fields of the node
+##
+## Example : s = vrml_Background ("skyColor",[0 0 1]);
+##
+
+function s = vrml_Background (varargin)
+
+hash = struct(varargin{:});
+
+opts = struct ("skyColor",         3,
+              "groundColor",      3,
+               "skyAngle",         1,
+              "groundAngle",      1,
+              "backUrl",          0,
+              "bottomUrl",        0,
+              "frontUrl",         0,
+              "leftUrl",          0,
+              "rightUrl",         0,
+              "topUrl",           0);
+
+body = "";
+for [val,key] = hash,
+  if isfield (opts, key)
+    n = opts.(key);
+    if (n == 0)
+      if (ischar(val))
+        body = [ body, sprintf('   %-20s   "%s"\n', key, val) ];
+      else
+        error ("vrml_Background: field '%s' expects string", key);
+      endif
+    elseif (n == 1)
+      if (isscalar(val))
+        body = [ body, sprintf('   %-20s   [ %8.3f ]\n', key, val) ];
+      else
+        error ("vrml_Background: field '%s' expects scalar", key);
+      endif
+    else
+      if (isvector(val) && length(val) == 3)
+        body = [body, sprintf('   %-20s   [ %8.3f %8.3f %8.3f ]\n', key, val)];
+      else
+        error ("vrml_Background: field '%s' expects [r g b]", key);
+      endif
+    endif
+  else
+    error ("vrml_Background : unknown field '%s'",key);
+  end
+end
+s = sprintf ("Background { \n%s}\n", body);
+endfunction
+