Updated .gitignore

code/src/Fitbot/.gitignore

@@ -13,3 +13,5 @@
 .externalNativeBuild
 .cxx
 local.properties
+.idea
+.vscode

code/src/Fitbot/app/build.gradle

@@ -35,7 +35,11 @@ dependencies {
     implementation 'com.android.support:cardview-v7:28.0.0'
     implementation 'com.android.support:design:28.0.0'
     implementation 'org.joml:joml:1.10.5'
+    implementation 'com.google.code.gson:gson:2.8.6'
     testImplementation 'junit:junit:4.13.2'
+    testImplementation 'org.junit.jupiter:junit-jupiter'
+    testImplementation 'org.junit.jupiter:junit-jupiter'
+    testImplementation 'org.junit.jupiter:junit-jupiter'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
 	implementation 'com.aldebaran:qisdk:1.7.5'

code/src/Fitbot/app/src/main/AndroidManifest.xml

@@ -15,6 +15,9 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Fitbot" >
+        <activity
+            android:name=".ui.activities.FitnessActivity"
+            android:exported="true" />
         <activity
             android:name=".ui.activities.MainActivity"
             android:exported="true" >

code/src/Fitbot/app/src/main/java/com/example/fitbot/exercise/AbstractExercise.java

@@ -0,0 +1,104 @@
+package com.example.fitbot.exercise;
+
+import android.util.Log;
+
+import com.example.fitbot.util.path.GesturePath;
+import com.example.fitbot.util.server.IWebSocketHandler;
+import com.example.fitbot.util.server.WebSocket;
+
+import java.util.Objects;
+
+public abstract class AbstractExercise implements IWebSocketHandler {
+
+    private EMuscleGroup muscleGroup;
+    private GesturePath path;
+
+    // Static fields.
+    private static WebSocket webSocket;
+    private static AbstractExercise currentExercise = null;
+
+
+    /**
+     * Constructor for the AbstractExercise class.
+     *
+     * @param muscleGroup  The muscle group of the exercise.
+     * @param path         The path of the exercise.
+     */
+    public AbstractExercise(EMuscleGroup muscleGroup,  GesturePath path) {
+        this.muscleGroup = muscleGroup;
+        this.path = path;
+    }
+
+    /**
+     * Start the exercise.
+     * This method starts a WebSocket server
+     */
+    public final void startExercise() {
+
+        // Ensure no other exercise is active.
+        if (currentExercise != null && currentExercise != this) {
+            currentExercise.__stopExercise();
+            Log.i("Exercises", "Another exercise was started when another was still running.");
+        }
+
+        // If a WebSocket server is already running, change the event handler to be this class.
+        if (webSocket != null && webSocket.isConnected()) {
+            webSocket.setEventHandler(this);
+        }
+
+        try {
+            webSocket = WebSocket.createServer();
+            Objects.requireNonNull(webSocket, "WebSocket server could not be created.");
+
+            webSocket.startListening();
+            webSocket.setEventHandler(this);
+            currentExercise = this;
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Method for ending this exercise and returning the grade of the performance
+     * of this activity.
+     */
+    public final double finishExercise() {
+        this.__stopExercise();
+
+        // TODO: Implement grade calculation
+        return 0.0;
+    }
+
+    /**
+     * Stop the exercise.
+     * This method stops the WebSocket server.
+     */
+    private void __stopExercise() {
+        if (webSocket != null && webSocket.isConnected()) {
+            webSocket.stop();
+            webSocket = null;
+        }
+        currentExercise = null;
+    }
+
+    /**
+     * Check if the current exercise is the current activity.
+     */
+    public final boolean isCurrentActivity() {
+        return currentExercise == this;
+    }
+
+    /**
+     * Get the muscle group of the exercise.
+     */
+    public EMuscleGroup getMuscleGroup() {
+        return muscleGroup;
+    }
+
+    /**
+     * Get the path of the exercise.
+     */
+    public GesturePath getPath() {
+        return path;
+    }
+}

code/src/Fitbot/app/src/main/java/com/example/fitbot/exercise/EMuscleGroup.java

@@ -0,0 +1,30 @@
+package com.example.fitbot.exercise;
+
+public enum EMuscleGroup {
+    // TODO: Implement
+
+    TORSO(0),
+    ARMS(1),
+    LEGS(2),
+    BALANCE(3);
+
+    int muscleGroupIdentifier;
+
+    EMuscleGroup(int identifier) {
+        this.muscleGroupIdentifier = identifier;
+    }
+
+    public int getIdentifier() {
+        return this.muscleGroupIdentifier;
+    }
+
+    public static EMuscleGroup parse(int identifier) {
+        for (EMuscleGroup muscleGroup : EMuscleGroup.values()) {
+            if (muscleGroup.getIdentifier() == identifier) {
+                return muscleGroup;
+            }
+        }
+        return null;
+    }
+
+}

code/src/Fitbot/app/src/main/java/com/example/fitbot/exercise/ExerciseUser.java

@@ -0,0 +1,53 @@
+package com.example.fitbot.exercise;
+
+
+/**
+ * The ExerciseUser class represents a user of the exercise application.
+ * This contains all necessary information of the current user.
+ */
+public class ExerciseUser {
+
+    public float upperArmLength;
+    public float lowerArmLength;
+    public float upperLegLength;
+    public float lowerLegLength;
+    public float height;
+
+    /**
+     * Constructor for the ExerciseUser class.
+     * @param upperArmLength The length of the upper arm.
+     * @param lowerArmLength The length of the lower arm.
+     * @param height The height of the user.
+     * @param upperLegLength The length of the upper leg.
+     * @param lowerLegLength The length of the lower leg.
+     */
+    public ExerciseUser(float upperArmLength, float lowerArmLength, float height, float upperLegLength, float lowerLegLength) {
+        this.upperArmLength = upperArmLength;
+        this.lowerArmLength = lowerArmLength;
+        this.upperLegLength = upperLegLength;
+        this.lowerLegLength = lowerLegLength;
+        this.height = height;
+    }
+
+    /**
+     * Constructor for the ExerciseUser class.
+     * @param height The height of the user.
+     */
+    public ExerciseUser(float height) {
+        this.height = height;
+        this.upperArmLength = height * 0.2f;
+        this.lowerArmLength = height * 0.2f;
+        this.upperLegLength = height * 0.3f;
+        this.lowerLegLength = height * 0.3f;
+    }
+
+    /**
+     * Default constructor for the ExerciseUser class.
+     * This sets the default height to 180.0f. (1.80m)
+     */
+    public ExerciseUser() {
+        this(180.0f);
+    }
+
+
+}

code/src/Fitbot/app/src/main/java/com/example/fitbot/exercise/FitnessManager.java

@@ -0,0 +1,113 @@
+package com.example.fitbot.exercise;
+
+import com.example.fitbot.util.path.GesturePath;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+
+import org.joml.Vector3f;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.lang.reflect.Constructor;
+import java.net.URL;
+import java.net.URLConnection;
+
+public class FitnessManager {
+
+    private static final String HOST_ADDRESS = "http://145.92.8.132";
+
+    private static final String PROPERTY_DESC = "description";
+    private static final String PROPERTY_VECTORS = "vector_data";
+    private static final String PROPERTY_NAME = "name";
+    private static final String PROPERTY_MUSCLE_GROUP = "muscle_group";
+
+    private static String sendHTTP(String url, String method, String contentType, String body) {
+        try {
+            URLConnection connection = new URL(url).openConnection();
+            connection.addRequestProperty("Content-Type", contentType);
+            connection.addRequestProperty("Request-Method", method);
+            connection.getOutputStream().write(body.getBytes());
+            connection.connect();
+            InputStream stream = connection.getInputStream();
+            BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
+            StringBuilder builder = new StringBuilder();
+            String line;
+            while ((line = reader.readLine()) != null) {
+                builder.append(line);
+            }
+            return builder.toString();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    /**
+     * Function for retrieving an exercise from the Raspberry Pi Database.
+     *
+     * @param uniqueIdentifier The unique identifier of the exercise
+     * @return The exercise, if it exists on the server. Otherwise null.
+     */
+    public static <T extends AbstractExercise> AbstractExercise acquireExercise(String uniqueIdentifier, Class<T> referenceClass) {
+        String response = sendHTTP(
+                HOST_ADDRESS + "/acquire", "GET", "application/json", "{\"kind\":\"" + uniqueIdentifier + "\"}"
+        );
+        // Validate the response
+        if (response != null) {
+            try {
+                JsonObject content = JsonParser.parseString(response).getAsJsonObject();
+                Constructor<T> constructor = referenceClass.getConstructor(referenceClass);
+                T instance = null;
+                try {
+                    instance = constructor.newInstance(
+                            EMuscleGroup.parse(content.get(PROPERTY_MUSCLE_GROUP).getAsInt()),
+                            gesturePathFromString(content.get(PROPERTY_VECTORS).getAsString())
+                    );
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+                return instance;
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Function for converting a string to a GesturePath object.
+     * The input string bytes will be directly converted into 3d vectors.
+     * Every coordinate is composed of 32 bits, so four characters per coordinate.
+     *
+     * @param input The string to convert
+     * @return The GesturePath object
+     */
+    private static GesturePath gesturePathFromString(String input) {
+        byte[] bytes = input.getBytes();
+
+        // Check if the input string contains a valid amount of bytes (12 bytes per vector)
+        if (input.length() % 12 != 0) {
+            throw new IllegalArgumentException("Invalid input string length");
+        }
+        GesturePath.Builder builder = new GesturePath.Builder();
+
+        float[] xyz = new float[3];
+        for (int i = 0; i < bytes.length; i += 12) {
+            for (int j = 0; j < 3; j++) {
+                xyz[j] = Float.intBitsToFloat(
+                                (bytes[i + j * 4] & 0xFF) << 24 |
+                                (bytes[i + j * 4 + 1] & 0xFF) << 16 |
+                                (bytes[i + j * 4 + 2] & 0xFF) << 8 |
+                                (bytes[i + j * 4 + 3] & 0xFF)
+                );
+            }
+            builder.addVector(new Vector3f(
+                    xyz[0], xyz[1], xyz[2]
+            ));
+        }
+        return builder.build();
+    }
+
+}

code/src/Fitbot/app/src/main/java/com/example/fitbot/sports/ESportType.java

@@ -1,18 +0,0 @@
-package com.example.fitbot.sports;
-
-public enum ESportType {
-
-    FITNESS("Fitness"),
-    POWER("Krachttrening");
-
-    private final String name;
-
-    ESportType(String name) {
-        this.name = name;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-}

code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/activities/MainActivity.java

@@ -1,6 +1,7 @@
 package com.example.fitbot.ui.activities;
 
 import android.annotation.SuppressLint;
+import android.content.Intent;
 import android.os.Bundle;
 import android.support.design.widget.NavigationView;
 import android.support.v4.view.GravityCompat;
@@ -8,6 +9,8 @@ import android.support.v4.widget.DrawerLayout;
 import android.support.v7.app.ActionBarDrawerToggle;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
+import android.util.Log;
+import android.widget.Button;
 
 import com.example.fitbot.R;
 
@@ -17,17 +20,26 @@ public class MainActivity extends AppCompatActivity {
     DrawerLayout drawerLayout;
     NavigationView navigationView;
     Toolbar toolbar;
+    Button startButton;
 
     @SuppressLint("WrongViewCast")
     @Override
     protected void onCreate (Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_main);
+        setContentView(R.layout.activity_main );
 
         /*---Hooks---*/
         drawerLayout = findViewById(R.id.drawer_layout);
         navigationView = findViewById(R.id.nav_view);
         toolbar = findViewById(R.id.toolbar);
+        startButton = findViewById(R.id.startButton);
+
+        startButton.setOnClickListener(v -> {
+            // Switch to fitness activity
+            Log.i("MainActivity", "Switching to FitnessActivity");
+            Intent intent = new Intent(MainActivity.this, FitnessActivity.class);
+            startActivity(intent);
+        });
 
         /*---Tool Bar---*/
 //      setSupportActionBar(toolbar);

code/src/Fitbot/app/src/main/java/com/example/fitbot/ui/components/PersonalMotionPreviewElement.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.Path;
+import android.util.Log;
 import android.view.View;
 
 import com.example.fitbot.util.path.GesturePath;
@@ -24,6 +25,8 @@ public class PersonalMotionPreviewElement extends View {
     private Path referencePath, performingPath;
     private Paint referencePaint, performingPaint;
 
+    private Paint backgroundColor = new Paint();
+
     /**
      * Constants for the preview path projection.
      */
@@ -42,6 +45,9 @@ public class PersonalMotionPreviewElement extends View {
      */
     public PersonalMotionPreviewElement(Context context, GesturePath path) {
         super(context);
+        Log.i("PersonalMotionPreviewElement", "Creating new PersonalMotionPreviewElement.");
+        this.backgroundColor = new Paint();
+        this.backgroundColor.setColor(0xFF000000); // Black
         this.path = path;
         this.motionProcessor = new MotionProcessor();
         this.motionProcessor.startListening();
@@ -158,6 +164,7 @@ public class PersonalMotionPreviewElement extends View {
 
     @Override
     public void onDraw(Canvas canvas) {
+        canvas.drawRect(0, 0, getWidth(), getHeight(), backgroundColor);
         // Draw the sport preview canvas
         canvas.drawPath(referencePath, referencePaint);
         canvas.drawPath(performingPath, performingPaint);

code/src/Fitbot/app/src/main/java/com/example/fitbot/util/path/GesturePath.java

@@ -10,7 +10,6 @@ public class GesturePath {
 
     // The vectors that make up the path.
     private final PathSegment[] segments;
-    private double curvature;
 
     public GesturePath(Vector3f[] vectors) {
         this(vectors, 0.0D);
@@ -27,7 +26,6 @@ public class GesturePath {
         if ( vectors.length < 2)
             throw new IllegalArgumentException("A path must have at least two points.");
 
-        this.curvature = curvature;
         this.segments = new PathSegment[vectors.length - 1];
         for ( int i = 0; i < vectors.length - 1; i++)
             segments[i] = new PathSegment(vectors[i], vectors[i + 1]);
@@ -39,7 +37,6 @@ public class GesturePath {
      */
     public GesturePath(PathSegment... segments) {
         this.segments = segments;
-        this.curvature = 0.0d;
     }
 
     /**

code/src/Fitbot/app/src/main/java/com/example/fitbot/util/path/PathSegment.java

@@ -25,10 +25,9 @@ public class PathSegment {
      * depending on the curvature of the curve. If the curvature is unset, or set to 0
      * then this method will use linear interpolation. Otherwise, it will use a curve.
      *
-     * @param dst The destination vector to interpolate to.
      * @param t   The interpolation value between 0 and 1.
      */
-    public Vector3f interpolate(Vector3f dst, double t) {
+    public Vector3f interpolate(double t) {
         return new Vector3f(this.start)
                 .lerp(this.end, (float) Math.min(1.0F, Math.max(0.0F, t)));
     }

code/src/Fitbot/app/src/main/res/layout/activity_fitness.xml

@@ -1,10 +1,25 @@
-<?xml version="1.0" encoding="utf-8"?>
+<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+xmlns:app="http://schemas.android.com/apk/res-auto"
+xmlns:tools="http://schemas.android.com/tools"
+android:id="@+id/drawer_layout"
+android:layout_width="match_parent"
+android:layout_height="match_parent"
+android:background="#232323"
+android:fitsSystemWindows="true"
+tools:context=".ui.activities.FitnessActivity"
+tools:openDrawer="start">
+
+<LinearLayout
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:orientation="vertical">
 
     <com.example.fitbot.ui.components.PersonalMotionPreviewElement
+        android:id="@+id/personalMotionPreviewElement"
+        android:visibility="visible"
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
 
-</android.support.constraint.ConstraintLayout>
+</LinearLayout>
+
+</android.support.v4.widget.DrawerLayout>

code/src/Fitbot/app/src/test/java/com/example/fitbot/PathSegmentTest.java

@@ -0,0 +1,37 @@
+package com.example.fitbot;
+
+import static org.junit.Assert.assertEquals;
+
+import com.example.fitbot.util.path.GesturePath;
+import com.example.fitbot.util.path.PathSegment;
+
+import org.joml.Vector3f;
+import org.junit.Test;
+
+public class PathSegmentTest {
+
+    @Test
+    public void testPathSegment() {
+        // Test the PathSegment class
+        Vector3f[] vectors = new Vector3f[2];
+        vectors[0] = new Vector3f(0, 0, 0);
+        vectors[1] = new Vector3f(1, 1, 1);
+        GesturePath path = new GesturePath(vectors);
+        PathSegment[] segments = path.getSegments();
+        assertEquals(1, segments.length);
+        assertEquals(new Vector3f(0, 0, 0), segments[0].getStart());
+        assertEquals(new Vector3f(1, 1, 1), segments[0].getEnd());
+        assertEquals(new Vector3f(0.5f, 0.5f, 0.5f), segments[0].interpolate(0.5));
+    }
+
+
+    @Test
+    public void test_pathSegmentInterpolation() {
+        Vector3f start = new Vector3f(0, 0, 0);
+        Vector3f end = new Vector3f(1, 1, 1);
+        PathSegment segment = new PathSegment(start, end);
+        assertEquals(new Vector3f(0.5f, 0.5f, 0.5f), segment.interpolate(0.5));
+    }
+
+
+}