store avatar position and yaw in file to restore on relaunch

interface/src/Avatar.cpp

@@ -1539,3 +1539,23 @@ glm::vec3 Avatar::getGravity(glm::vec3 pos) {
         return glm::vec3(0.f, 0.f, 0.f);
     }
 }
+
+const char AVATAR_DATA_FILENAME[] = "avatar.ifd";
+
+void Avatar::writeAvatarDataToFile() {
+    // write the avatar position and yaw to a local file
+    FILE* avatarFile = fopen(AVATAR_DATA_FILENAME, "w");
+    
+    if (avatarFile) {
+        fprintf(avatarFile, "%f,%f,%f %f", _position.x, _position.y, _position.z, _bodyYaw);
+        fclose(avatarFile);
+    }
+}
+
+void Avatar::readAvatarDataFromFile() {
+    FILE* avatarFile = fopen(AVATAR_DATA_FILENAME, "r");
+    
+    if (avatarFile) {
+        fscanf(avatarFile, "%f,%f,%f %f", &_position.x, &_position.y, &_position.z, &_bodyYaw);
+    }
+}

interface/src/Avatar.h

@@ -145,6 +145,9 @@ public:
     
     //  Find out what the local gravity vector is at this location
     glm::vec3 getGravity(glm::vec3 pos);
+    
+    void writeAvatarDataToFile();
+    void readAvatarDataFromFile();
 
 private:
 

interface/src/main.cpp

@@ -344,7 +344,9 @@ void init(void)
 
 void terminate () {
     // Close serial port
-    //close(serial_fd);
+    // close(serial_fd);
+    
+    myAvatar.writeAvatarDataToFile();    
 
     #ifndef _WIN32
     audio.terminate();
@@ -1944,6 +1946,8 @@ int main(int argc, const char * argv[])
         printLog("Network receive thread created.\n"); 
     }
     
+    myAvatar.readAvatarDataFromFile();
+    
     glutTimerFunc(1000, Timer, 0);
     glutMainLoop();