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DAv10195
128
java/com/example/ex4/Joystick.java
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128
java/com/example/ex4/Joystick.java
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package com.example.ex4;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.PorterDuff;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.SurfaceHolder;
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import android.view.SurfaceView;
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import android.view.View;
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public class Joystick extends SurfaceView implements SurfaceHolder.Callback, View.OnTouchListener {
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private float centerX;
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private float centerY;
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private float baseRadius;
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private float hatRadius;
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private JoystickListener joystickCallback;
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//CTOR
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public Joystick(Context context, AttributeSet attrs)
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{
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super(context, attrs);
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getHolder().addCallback(this);
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setOnTouchListener(this);
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if (context instanceof JoystickListener)
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joystickCallback = (JoystickListener) context;
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}
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//CTOR
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public Joystick(Context context, AttributeSet attrs, int defStyleAttr)
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{
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super(context, attrs, defStyleAttr);
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getHolder().addCallback(this);
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setOnTouchListener(this);
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if (context instanceof JoystickListener)
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joystickCallback = (JoystickListener) context;
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}
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//CTOR
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public Joystick(Context context)
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{
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super(context);
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getHolder().addCallback(this);
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setOnTouchListener(this);
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if (context instanceof JoystickListener)
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joystickCallback = (JoystickListener) context;
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}
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//instantiate dimenstions for drawing the Joystick
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private void setupDimensions()
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{
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centerX = getWidth() / 2;
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centerY = getHeight() / 2;
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baseRadius = Math.min(getWidth(), getHeight()) / 3;
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hatRadius = Math.min(getWidth(), getHeight()) / 5;
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}
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//method to be called when Joystick surface is created
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@Override
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public void surfaceCreated(SurfaceHolder surfaceHolder)
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{
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setupDimensions();
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drawJoystick(centerX, centerY);
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}
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//method to be called when Joystick surface is changed
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@Override
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public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2)
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{
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setupDimensions();
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drawJoystick(centerX,centerY);
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}
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//method to be called when Joystick sutface is destroyed
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@Override
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public void surfaceDestroyed(SurfaceHolder surfaceHolder)
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{
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UserHandler.getInstance().disconnect();
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}
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/*when Joystick is touched, method will be called and will compute values to be sent as
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* arguments to the JoystickCallBack onJoystickMoved even handler*/
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@Override
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public boolean onTouch(View view, MotionEvent event)
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{
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if (view.equals(this))
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{
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if (event.getAction() != MotionEvent.ACTION_UP)
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{
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float displacement = (float) Math.sqrt((Math.pow(event.getX() - centerX, 2)) +
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Math.pow(event.getY() - centerY, 2));
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if (displacement < baseRadius)
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{
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drawJoystick(event.getX(), event.getY());
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joystickCallback.onJoystickMoved((centerX - event.getX()) / baseRadius,
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(event.getY() - centerY) / baseRadius, getId());
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}
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else {
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float ratio = baseRadius / displacement;
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float constrainedX = centerX + (event.getX() - centerX) * ratio;
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float constrainedY = centerY + (event.getY() - centerY) * ratio;
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drawJoystick(constrainedX, constrainedY);
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joystickCallback.onJoystickMoved((constrainedX - centerX) / baseRadius,
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(centerY - constrainedY) / baseRadius, getId());
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}
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} else {
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drawJoystick(centerX, centerY);
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joystickCallback.onJoystickMoved(0, 0, getId());
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}
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}
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return true;
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}
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//draw the Joystick
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private void drawJoystick(float x, float y)
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{
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if (getHolder().getSurface().isValid())
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{
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Canvas drawCanvas = this.getHolder().lockCanvas();
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Paint colors = new Paint();
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drawCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
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colors.setARGB(255, 50, 50, 50);
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drawCanvas.drawCircle(centerX, centerY, baseRadius, colors);
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colors.setARGB(255, 0, 0, 255);
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drawCanvas.drawCircle(x, y, hatRadius, colors);
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getHolder().unlockCanvasAndPost(drawCanvas);
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}
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}
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//inteface defining the onJoystickMoved event handler
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public interface JoystickListener
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{
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void onJoystickMoved(float xPercent, float yPercent, int source);
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}
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}
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21
java/com/example/ex4/JoystickActivity.java
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21
java/com/example/ex4/JoystickActivity.java
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package com.example.ex4;
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import androidx.appcompat.app.AppCompatActivity;
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import android.os.Bundle;
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public class JoystickActivity extends AppCompatActivity implements Joystick.JoystickListener
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{
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_joystick);
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}
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//method to handle OnJoystickMoved event
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public void onJoystickMoved(float xPercent, float yPercent, int source)
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{
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UserHandler handler = UserHandler.getInstance();
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handler.send_message(true, xPercent); //true is aileron
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handler.send_message(false, yPercent); //false is elevator
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}
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}
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30
java/com/example/ex4/MainActivity.java
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30
java/com/example/ex4/MainActivity.java
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package com.example.ex4;
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import androidx.appcompat.app.AppCompatActivity;
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import android.content.Intent;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.Button;
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import android.widget.EditText;
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public class MainActivity extends AppCompatActivity implements View.OnClickListener
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{
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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//assign the onClick as the one to be executed once the connect button is pressed
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Button connect_button = findViewById(R.id.connect_button);
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connect_button.setOnClickListener(this);
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}
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//onClick method of the connect button
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public void onClick(View view)
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{
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EditText[] values = new EditText[]{findViewById(R.id.ip_val),findViewById(R.id.port_val)};
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UserHandler.getInstance().connect(values[0].getText().toString(),
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Integer.parseInt(values[1].getText().toString()));
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startActivity(new Intent(this, JoystickActivity.class));
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}
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}
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109
java/com/example/ex4/UserHandler.java
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109
java/com/example/ex4/UserHandler.java
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package com.example.ex4;
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import java.io.BufferedWriter;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import java.net.Inet4Address;
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import java.net.InetAddress;
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import java.net.Socket;
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public class UserHandler
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{
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private String aileron_path;
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private String elevator_path;
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private volatile String connection_ip;
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private volatile int connection_port;
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private volatile boolean stop;
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private volatile String message;
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private Thread message_thread;
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//static instance to be returned by getInstance()
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private static UserHandler instance = null;
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//get instance of the this singleton UserHandler
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public static UserHandler getInstance()
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{
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if (instance == null)
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{
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instance = new UserHandler();
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}
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return instance;
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}
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//CTOR
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private UserHandler()
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{
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aileron_path = "/controls/flight/aileron";
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elevator_path = "/controls/flight/elevator";
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connection_ip = null;
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connection_port = 0;
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stop = false;
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message = null;
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message_thread = null;
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}
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//connect to FlightGear simulator
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public void connect(String ip, int port)
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{
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connection_ip = ip;
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connection_port = port;
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message_thread = new Thread(new Runnable()
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{
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@Override
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public void run()
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{
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Socket sock = null;
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PrintWriter writer = null;
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try
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{
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sock = new Socket(InetAddress.getByName(connection_ip), connection_port);
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writer = new PrintWriter(new BufferedWriter((new OutputStreamWriter(sock.getOutputStream()))), true);
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//wait for message to send...
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while (!stop)
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{
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synchronized (this)
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{
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if (message != null) {
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writer.print(message);
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message = null; }
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}
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}
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sock.close();
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sock = null;
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writer.close();
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writer = null;
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}
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catch (Exception e)
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{
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if (sock != null) { try { sock.close(); } catch (Exception ex) { ex.printStackTrace(); }}
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if (writer != null) { writer.close(); }
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e.printStackTrace();
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return;
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}
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}
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});
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message_thread.start();
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}
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//disconnect from FlightGear simulator
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public void disconnect()
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{
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stop = true;
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try
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{
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message_thread.join();
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}
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catch (Exception e)
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{
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e.printStackTrace();
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}
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}
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//send message to FlightGear
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public void send_message(boolean aileron, float val)
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{
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String aileron_or_elevator = elevator_path;
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if (aileron)
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{
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aileron_or_elevator = aileron_path;
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}
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synchronized (this)
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{
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message = "set " + aileron_or_elevator + " " + Float.toString(val) + " \r\n";
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}
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}
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}
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