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Change code style about code of calorie calculation.

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youtaol
2013-08-20 11:06:37 +08:00
parent cbd6d8158a
commit d16949c139
9 changed files with 78 additions and 49 deletions
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MyTracks/src/com/google/android/apps/mytracks/content/MyTracksProvider.java
+1 -1
View File
@@ -132,7 +132,7 @@ public class MyTracksProvider extends ContentProvider {
}
if (oldVersion <= 22) {
Log.w(TAG, "Upgrade DB: Adding track calories column.");
Log.w(TAG, "Upgrade DB: Adding track calorie column.");
db.execSQL("ALTER TABLE " + TracksColumns.TABLE_NAME + " ADD " + TracksColumns.CALORIE
+ " INTEGER");
}
MyTracks/src/com/google/android/apps/mytracks/stats/TripStatisticsUpdater.java
+4 -1
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@@ -94,6 +94,9 @@ public class TripStatisticsUpdater {
// A buffer of the recent speed readings (m/s) for calculating max speed
private final DoubleBuffer speedBuffer = new DoubleBuffer(SPEED_SMOOTHING_FACTOR);
// Average weight.
private int defaultWeight = 65;
/**
* Creates a new trip statistics updater.
*
@@ -195,7 +198,7 @@ public class TripStatisticsUpdater {
// Update calorie
double calorie = CalorieUtils.getCalories(lastMovingLocation, location,
gradeBuffer.getAverage(), 65, ActivityType.FOOT);
gradeBuffer.getAverage(), defaultWeight, ActivityType.FOOT);
currentSegment.addCalorie(calorie);
lastLocation = location;
MyTracks/src/com/google/android/apps/mytracks/util/CalorieUtils.java
+35 -30
View File
@@ -35,36 +35,35 @@ public class CalorieUtils {
private static final double RESTING_VO2 = 3.5;
/**
* Ratio of change vo2 to kcal/L
* Ratio of change Liter to kcal. In kcal per Liter.
*/
private static final double VO2H_TO_KCAL = 5;
private static final double MILLISECOND_TO_SECOND = 1000.0;
private static final double MILLILITER_TO_LITER = 1000.0;
private static final double SECOND_TO_MINUTE = 60.0;
private static final double L_TO_KCAL = 5;
/**
* Changes 4.5 miles per hour to meters per minutes.
* Critical speed running in meters per minute. Changes 4.5 miles per hour to
* meters per minute.
*/
@VisibleForTesting
static final double CRTICAL_SPEED_RUNNING = 4.5 * UnitConversions.MI_TO_KM * 1000
/ SECOND_TO_MINUTE;
static final double CRTICAL_SPEED_RUNNING = 4.5 * UnitConversions.MI_TO_KM
* UnitConversions.KM_TO_M * UnitConversions.MIN_TO_HR;
public enum ActivityType {
CYCLING, FOOT
}
/**
* Calculates the calorie expenditure of walking. This equation is appropriate
* Calculates the calorie of walking. This equation is appropriate
* for fairly slow speed ranges—from 1.9 to approximately 4 miles per hour
* (mph).
*
* @param speed is calculated in meters per minute (m/min)
* @param speed is calculated in meters per second (m/s)
* @param grade
* @return the VO2 value in ml/kg/min.
*/
@VisibleForTesting
static double calculateWalkingVO2(double speed, double grade) {
// Change meters per second to meters per minute
speed *= UnitConversions.MIN_TO_SECOND;
/*
* 0.1 means oxygen cost per meter of moving each kilogram (kg) of body
* weight while walking (horizontally). 1.8 means oxygen cost per meter of
@@ -74,17 +73,18 @@ public class CalorieUtils {
}
/**
* Calculates the calorie expenditure of running. This equation is appropriate
* Calculates the calorie of running. This equation is appropriate
* for speeds greater than 5.0 mph (or 3.0 mph or greater if the subject is
* truly jogging).
*
* @param speed is calculated in meters per minute (m/min)
* @param speed is calculated in meters per second (m/s)
* @param grade
* @return the VO2 value in ml/kg/min.
*/
@VisibleForTesting
static double calculateRunningVO2(double speed, double grade) {
// Change meters per second to meters per minute
speed *= UnitConversions.MIN_TO_SECOND;
/*
* 0.2 means oxygen cost per meter of moving each kg of body weight while
* running (horizontally). 0.9 means oxygen cost per meter of moving total
@@ -94,7 +94,7 @@ public class CalorieUtils {
}
/**
* Calculates the calorie expenditure of cycling. Use below equation: <br>
* Calculates the calorie of cycling. Use below equation: <br>
* P = g * m * Vg * (K1 + s) + K2 * (Va)^2 * Vg
* <ul>
* <li>P - Power in watts(Joule/second)</li>
@@ -117,8 +117,17 @@ public class CalorieUtils {
*/
@VisibleForTesting
static double calculateCyclingCalories(double speed, double grade, int weight, double timeUsed) {
double earthGravity = 9.8;
// Lumped constant for all frictional losses (tires, bearings, chain)
double K1 = 0.0053;
// Lumped constant for aerodynamic drag
double K2 = 0.185;
// Get the Power
double power = 9.8 * weight * speed * (0.0053 + grade) + 0.185 * (speed * speed * speed);
double power = earthGravity * weight * speed * (K1 + grade) + K2 * (speed * speed * speed);
// Get the calories
return power * timeUsed / UnitConversions.KCAL_TO_J;
}
@@ -135,8 +144,8 @@ public class CalorieUtils {
@VisibleForTesting
static double calculateExpenditureCycling(Location start, Location stop, double grade, int weight) {
// Gets time in seconds
double time = (double) (stop.getTime() - start.getTime()) / MILLISECOND_TO_SECOND;
// Meters per second
double time = (double) (stop.getTime() - start.getTime()) * UnitConversions.MS_TO_S;
// Get speed in meters per second
double speed = (start.getSpeed() + stop.getSpeed()) / 2.0;
if (grade < 0) {
grade = 0.0;
@@ -156,24 +165,20 @@ public class CalorieUtils {
*/
@VisibleForTesting
static double calculateExpenditureFoot(Location start, Location stop, double grade, int weight) {
// Meters per minute
double averageSpeed = (start.getSpeed() + stop.getSpeed()) * SECOND_TO_MINUTE / 2.0;
// Get VO2
// Get speed in meters per second
double averageSpeed = (start.getSpeed() + stop.getSpeed()) / 2.0;
// Get VO2 in mL/kg/min
double VO2 = getVO2(averageSpeed, grade);
// Seconds
double time = (double) (stop.getTime() - start.getTime()) / MILLISECOND_TO_SECOND;
// Change mL/kg/min to mL/kg
double VO2All_mL = VO2 * time / SECOND_TO_MINUTE;
// Change mL/kg to L/kg
double VO2All_L = VO2All_mL / MILLILITER_TO_LITER;
// Get the calorie
return VO2All_L * weight * VO2H_TO_KCAL;
// Minutes
double time = (double) (stop.getTime() - start.getTime()) * UnitConversions.MS_TO_S * UnitConversions.S_TO_MIN;
// Get the calorie. The unit of calorie is kcal which is came from mL/kg/min * min * L/mL * kg * kcal/L
return VO2 * time * UnitConversions.ML_TO_L * weight * L_TO_KCAL;
}
/**
* Gets the VO2 value.
*
* @param speed in meters per minute
* @param speed in meters per second
* @param grade the grade to calculate
* @return the VO2 value.
*/
MyTracks/src/com/google/android/apps/mytracks/util/StatsUtils.java
+4 -1
View File
@@ -40,6 +40,9 @@ public class StatsUtils {
private static final String GRADE_FORMAT = "%1$d";
private static final String CALORIES_FORMAT = "%1$.0f";
private static final String CALORIES_UNIT = "Cal";
private StatsUtils() {}
/**
@@ -331,6 +334,6 @@ public class StatsUtils {
*/
private static void setCalorie(Activity activity, int itemId, int labelId, double calorie) {
setItem(activity, itemId, labelId,
String.format(Locale.getDefault(), CALORIES_FORMAT, calorie), null);
String.format(Locale.getDefault(), CALORIES_FORMAT, calorie), CALORIES_UNIT);
}
}
MyTracks/src/com/google/android/apps/mytracks/util/UnitConversions.java
+17
View File
@@ -22,6 +22,21 @@ package com.google.android.apps.mytracks.util;
*/
public class UnitConversions {
// Milliliter to liter
static final double ML_TO_L = 1 / 1000.0;
// Millisecond to second
static final double MS_TO_S = 1 / 1000.0;
// Minute to second
static final double MIN_TO_SECOND = 60.0;
// Second to minute
static final double S_TO_MIN = 1 / MIN_TO_SECOND;
// Minute to hour
static final double MIN_TO_HR = 1 / 60.0;
private UnitConversions() {}
// multiplication factor to convert kilometers to miles
@@ -39,6 +54,8 @@ public class UnitConversions {
// multiplication factor to convert meters to kilometers
public static final double M_TO_KM = 1 / 1000.0;
public static final double KM_TO_M = 1 / M_TO_KM;
// multiplication factor to convert meters per second to kilometers per hour
public static final double MS_TO_KMH = 3.6;