don't run gtk's "main_iteration" more than once per second (improves performance)

fixed typo
fixed another floating point inaccuracy issue
replaced full function definitions for "ceil", "sqrt" and "number" with lambda inline functions


git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@723 bbaffbd6-741e-11dd-a85d-61de82d9cad9

src/pycam/Geometry/utils.py

@@ -30,25 +30,22 @@ epsilon = 0.00001
 _use_precision = False
 
 
-def sqrt(value):
-    # support precision libraries like "decimal" (built-in)
-    if -epsilon < value <= 0:
-        # compensate slightly negative values (due to float inaccuracies)
-        return 0
-    if hasattr(value, "sqrt"):
-        return value.sqrt()
-    else:
-        return math.sqrt(value)
-
-def ceil(value):
-    if hasattr(value, "next_minus"):
-        return int((value + number(1).next_minus()) // 1)
-    else:
-        return int(math.ceil(value))
-
-def number(value):
-    if _use_precision:
-        return decimal.Decimal(str(value))
-    else:
-        return float(value)
+# the lambda functions below are more efficient than function definitions
+
+if _use_precision:
+    ceil = lambda value: int((value + number(1).next_minus()) // 1)
+else:
+    ceil = lambda value: int(math.ceil(value))
+
+# return "0" for "-epsilon < value < 0" (to work around floating inaccuracies)
+# otherwise: return the sqrt function of the current type (could even raise exceptions)
+if _use_precision:
+    sqrt = lambda value: (((value < -epsilon) or (value > 0)) and value.sqrt()) or 0
+else:
+    sqrt = lambda value: (((value < -epsilon) or (value > 0)) and math.sqrt(value)) or 0
+
+if _use_precision:
+    number = lambda value: decimal.Decimal(str(value))
+else:
+    number = lambda value: value
 

src/pycam/Gui/Project.py

@@ -174,6 +174,7 @@ class ProjectGui:
         self._batch_queue = []
         self._progress_running = False
         self._progress_cancel_requested = False
+        self._last_gtk_events_time = None
         self.gui = gtk.Builder()
         gtk_build_file = get_data_file_location(GTKBUILD_FILE)
         if gtk_build_file is None:
@@ -2621,8 +2622,15 @@ class ProjectGui:
             lines.append(eta_text)
         self.progress_bar.set_text(os.linesep.join(lines))
         # update the GUI
+        current_time = time.time()
+        # Don't update the GUI more often than once per second.
+        # This restriction improves performance and reduces the
+        # "snappiness" of the GUI.
+        if (self._last_gtk_events_time is None) \
+                or (self._last_gtk_events_time + 1 < current_time):
             while gtk.events_pending():
                 gtk.main_iteration()
+            self._last_gtk_events_time = current_time
         # return if the user requested a break
         return self._progress_cancel_requested
 
@@ -2897,7 +2905,7 @@ class ProjectGui:
         if filename_templates is None:
             valid_templates = []
         else:
-            valid_templates = [t for t in filename_templates if one_template]
+            valid_templates = [t for t in filename_templates if t]
         if valid_templates:
             filename_template = valid_templates[0]
             # remove the extension

src/pycam/PathGenerators/ContourFollow.py

@@ -206,7 +206,7 @@ class ContourFollow:
         # collision handling function
         for z in z_steps:
             # update the progress bar and check, if we should cancel the process
-            if draw_callback and draw_callback(text="PushCutter: processing" \
+            if draw_callback and draw_callback(text="ContourFollow: processing" \
                         + " layer %d/%d" % (current_layer + 1, num_of_layers)):
                 # cancel immediately
                 break
@@ -353,6 +353,9 @@ class ContourFollow:
                         # This is just an accuracy issue (see the
                         # "triangle.minz >= z" statement above).
                         outer_edges = []
+                    elif not [p for p in triangle.get_points() if p.z > z + epsilon]:
+                        # same as above: fix for inaccurate floating calculations
+                        outer_edges = []
                     else:
                         # this should not happen
                         raise ValueError(("Could not find a waterline, but " \