Draw Basic 2020 Field Spline GUI

Change-Id: I39fe7176b85ca00fb35205e0050f3e8d0d5b5696
diff --git a/frc971/control_loops/python/constants.py b/frc971/control_loops/python/constants.py
index 7b45215..e0b4878 100644
--- a/frc971/control_loops/python/constants.py
+++ b/frc971/control_loops/python/constants.py
@@ -11,18 +11,31 @@
 args = arg_parser.parse_args()
 SCREEN_SIZE = args.size
 
-WIDTH_OF_FIELD_IN_METERS = 8.258302
-
 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
 
-def pxToM(p):
+FIELD = 2020
+
+if FIELD == 2019:
+    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
+
+def pxToM(p, length = False):
+    if(length):
+        return p * LENGTH_OF_FIELD_IN_METERS / (SCREEN_SIZE/2)
     return p * WIDTH_OF_FIELD_IN_METERS / SCREEN_SIZE
 
-def mToPx(m):
+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 inToM(i):
+    return (i*0.0254)