defined basic models and some low level functions

rowers/courses.py

@@ -0,0 +1,73 @@
+# All the Courses related methods
+
+# Python
+from django.utils import timezone
+from datetime import datetime
+from datetime import timedelta
+import time
+from django.db import IntegrityError
+import uuid
+from django.conf import settings
+
+from utils import myqueue
+
+from matplotlib import path
+
+import django_rq
+queue = django_rq.get_queue('default')
+queuelow = django_rq.get_queue('low')
+queuehigh = django_rq.get_queue('low')
+
+from rowers.models import (
+    Rower, Workout,
+    GeoPoint,GeoPolygon, GeoCourse,
+    )
+
+# low level methods
+class InvalidTrajectoryError(Exception):
+    def __init__(self,value):
+	self.value=value
+
+    def __str__(self):
+	return repr(self.value)
+
+def polygon_to_path(polygon):
+    points = GeoPoint.objects.filter(polygon==polygon).order_by(order_in_polygon)
+    s = []
+    for point in points:
+        s.append([point.latitude,point.longitude])
+
+    p = path.Path(np.array(s))
+
+    return p
+
+def coordinate_in_polygon(latitude,longitude, polygon):
+    p = polygon_to_path(polygon)
+
+    retun p.contains_points([(latitude,longitude)])[0]
+
+
+    
+def time_in_polygon(df,polygon,maxmin='max'):
+    # df has timestamp, latitude, longitude
+    p = polygon_to_path(polygon)
+
+    latitude = df.latitude
+    longitude = df.longitude
+
+    f = lambda x: coordinate_in_polygon(x['latitude'],x['longitude'],polygon)
+    
+    df['inpolygon'] = df.apply(f,axis=1)
+
+    mask = df['inpolygon'] == True
+
+    if df[mask].empty():
+        raise InvalidTrajectoryError
+    
+    if maxmin == 'max':
+        time = df[mask]['time'].max()
+    else:
+        time = df[mask]['time'].min()
+
+    
+    return time