MichiRun - SL4A Python script that will be purely awesome helper for kids who are bad at running on PE at school, haha

arcdist.py

# from http://www.johndcook.com/python_longitude_latitude.html
import math

def arc_on_unit_sphere(lat1, long1, lat2, long2):

    # Convert latitude and longitude to 
    # spherical coordinates in radians.
    degrees_to_radians = math.pi/180.0
        
    # phi = 90 - latitude
    phi1 = (90.0 - lat1)*degrees_to_radians
    phi2 = (90.0 - lat2)*degrees_to_radians
        
    # theta = longitude
    theta1 = long1*degrees_to_radians
    theta2 = long2*degrees_to_radians
        
    # Compute spherical distance from spherical coordinates.
        
    # For two locations in spherical coordinates 
    # (1, theta, phi) and (1, theta, phi)
    # cosine( arc length ) = 
    #    sin phi sin phi' cos(theta-theta') + cos phi cos phi'
    # distance = rho * arc length
    
    cos = (math.sin(phi1)*math.sin(phi2)*math.cos(theta1 - theta2) + 
           math.cos(phi1)*math.cos(phi2))
    arc = math.acos( cos )

    # Remember to multiply arc by the radius of the earth 
    # in your favorite set of units to get length.
    return arc

def distance_on_earth_sphere(lat1, long1, lat2, long2):
    arct = arc_on_unit_sphere(lat1, long1, lat2, long2)
    earthradius = 6367.5
    return arct*earthradius

locrot.py

# main file
import android, time, arcdist
droid = android.Android()
droid.startLocating(100, 0.25)
dist = 0
while True:
    time.sleep(1)
    loc = droid.readLocation().result
    if loc != {}:
        try:            
            print("%s %s" % (loc['gps']['latitude'], loc['gps']['longitude']))
            try:
                prevloc
            except NameError:
                prevloc = loc
            newdist = arcdist.distance_on_earth_sphere(loc['gps']['latitude'], loc['gps']['longitude'], prevloc['gps']['latitude'], prevloc['gps']['longitude'])
            print("delta %0.5f km = %0.5f meters" % (newdist, newdist*1000))
            dist = dist + newdist
            print("sum %0.5f km = %0.5f meters" % (dist, dist*1000))
        except KeyError:
            print("Lack of GPS")

Makefile

all: arcdist qloc locrot qrot

arcdist:
	adb push arcdist.py /storage/sdcard0/sl4a/scripts/

qloc:
	adb push qloc.py /storage/sdcard0/sl4a/scripts/

locrot:
	adb push locrot.py /storage/sdcard0/sl4a/scripts/

qrot:
	adb push qrot.py /storage/sdcard0/sl4a/scripts/

qloc.py

# background script to keep GPS running
import android, time
droid = android.Android()
droid.startLocating(100, 0)
while True:
    time.sleep(1)
    loc = droid.readLocation().result

qrot.py

import android, time
droid = android.Android()
droid.startSensingTimed(2, 250)
while True:
    time.sleep(1)
    rot = droid.readAccelerometer().result
    print ("%f %f %f" % (rot[1], rot[2], rot[3]))

I'd recommend to make it sleep 10ms instead of 1 in qloc.py, it'll devour battery otherwise D: