Update origin location on Spline GUI

Still plenty of other work that needs to be done on the spline gui, but
at least update things so that (0, 0) is at the center of the field
again.

Change-Id: I5ff552588ab76d83a3c85600089b4558281f36b3
diff --git a/frc971/control_loops/python/constants.py b/frc971/control_loops/python/constants.py
index e0b4878..4a74b4a 100644
--- a/frc971/control_loops/python/constants.py
+++ b/frc971/control_loops/python/constants.py
@@ -1,41 +1,39 @@
 import argparse
 
 arg_parser = argparse.ArgumentParser(description='spline_editor')
-arg_parser.add_argument(
-    'size',
-    metavar='N',
-    default=800,
-    type=int,
-    nargs='?',
-    help="size of the screen")
+arg_parser.add_argument('size',
+                        metavar='N',
+                        default=800,
+                        type=int,
+                        nargs='?',
+                        help="size of the screen")
 args = arg_parser.parse_args()
 SCREEN_SIZE = args.size
 
 WIDTH_OF_ROBOT = 0.65
 LENGTH_OF_ROBOT = 0.8
 
-ROBOT_SIDE_TO_BALL_CENTER = 0.15 # Placeholder value
+ROBOT_SIDE_TO_BALL_CENTER = 0.15  # Placeholder value
 BALL_RADIUS = 0.165
-ROBOT_SIDE_TO_HATCH_PANEL = 0.1 # Placeholder value
+ROBOT_SIDE_TO_HATCH_PANEL = 0.1  # Placeholder value
 HATCH_PANEL_WIDTH = 0.4826
 
 FIELD = 2020
 
 if FIELD == 2019:
-    WIDTH_OF_FIELD_IN_METERS = 8.258302 # Half Field
+    WIDTH_OF_FIELD_IN_METERS = 8.258302  # Half Field
 elif FIELD == 2020:
-    WIDTH_OF_FIELD_IN_METERS = 15.98295 # Full Field
-    LENGTH_OF_FIELD_IN_METERS = 8.21055 # Full Field
+    WIDTH_OF_FIELD_IN_METERS = 15.98295  # Full Field
+    LENGTH_OF_FIELD_IN_METERS = 8.21055  # Full Field
 
-def pxToM(p, length = False):
-    if(length):
-        return p * LENGTH_OF_FIELD_IN_METERS / (SCREEN_SIZE/2)
+
+def pxToM(p):
     return p * WIDTH_OF_FIELD_IN_METERS / SCREEN_SIZE
 
-def mToPx(m, length = False):
-    if(length):
-        return (m*(SCREEN_SIZE/2)/LENGTH_OF_FIELD_IN_METERS)
-    return (m*SCREEN_SIZE/WIDTH_OF_FIELD_IN_METERS)
+
+def mToPx(m):
+    return (m * SCREEN_SIZE / WIDTH_OF_FIELD_IN_METERS)
+
 
 def inToM(i):
-    return (i*0.0254)
+    return (i * 0.0254)