Added dt parameter

Author: tcstewar

nengo_gui/main.py

@@ -51,6 +51,9 @@ def main():
     parser.add_argument(
         '-b', '--backend', metavar='BACKEND',
         default='nengo', type=str, help='default backend to use')
+    parser.add_argument(
+        '--dt', metavar='DT', default=0.001, type=float,
+        help='simulator time step in seconds (default: 0.001)')
     parser.add_argument('--browser', dest='browser', type=str,
         metavar='BROWSER', default=True,
         help=browser_help)
@@ -97,7 +100,8 @@ def main():
                 nengo_gui.__path__[0], 'examples', 'default.py')
         else:
             filename = args.filename
-        page_settings = nengo_gui.page.PageSettings(backend=args.backend)
+        page_settings = nengo_gui.page.PageSettings(backend=args.backend,
+                                                    dt=args.dt)
         s = None
         while s is None:
             try:

nengo_gui/page.py

@@ -16,14 +16,15 @@
 
 
 class PageSettings(object):
-    __slots__ = ['backend', 'editor_class', 'filename_cfg']
+    __slots__ = ['backend', 'editor_class', 'filename_cfg', 'dt']
 
     def __init__(
-            self, filename_cfg=None, backend='nengo',
+            self, filename_cfg=None, backend='nengo', dt=0.001,
             editor_class=nengo_gui.components.AceEditor):
         self.filename_cfg = filename_cfg
         self.backend = backend
         self.editor_class = editor_class
+        self.dt = dt
 
 
 class Page(object):
@@ -461,12 +462,14 @@ def build(self):
                 old_sim.sim = None
                 old_sim.finished = True
 
+            dt = self.settings.dt
+
             exec_env = nengo_gui.exec_env.ExecutionEnvironment(self.filename,
                                                                allow_sim=True)
             # build the simulation
             try:
                 with exec_env:
-                    self.sim = backend.Simulator(self.model)
+                    self.sim = backend.Simulator(self.model, dt=dt)
             except:
                 line = nengo_gui.exec_env.determine_line_number()
                 self.error = dict(trace=traceback.format_exc(), line=line)