Add files via upload

2019-06-20 03:33:53 +03:00
commit 5b70036f18
27 changed files with 799 additions and 0 deletions
@@ -0,0 +1,128 @@
+package com.example.ex4;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
+
+public class Joystick extends SurfaceView implements SurfaceHolder.Callback, View.OnTouchListener {
+
+    private float centerX;
+    private float centerY;
+    private float baseRadius;
+    private float hatRadius;
+    private JoystickListener joystickCallback;
+    //CTOR
+    public Joystick(Context context, AttributeSet attrs)
+    {
+        super(context, attrs);
+        getHolder().addCallback(this);
+        setOnTouchListener(this);
+        if (context instanceof JoystickListener)
+            joystickCallback = (JoystickListener) context;
+    }
+    //CTOR
+    public Joystick(Context context, AttributeSet attrs, int defStyleAttr)
+    {
+        super(context, attrs, defStyleAttr);
+        getHolder().addCallback(this);
+        setOnTouchListener(this);
+        if (context instanceof JoystickListener)
+            joystickCallback = (JoystickListener) context;
+    }
+    //CTOR
+    public Joystick(Context context)
+    {
+        super(context);
+        getHolder().addCallback(this);
+        setOnTouchListener(this);
+        if (context instanceof JoystickListener)
+            joystickCallback = (JoystickListener) context;
+    }
+    //instantiate dimenstions for drawing the Joystick
+    private void setupDimensions()
+    {
+        centerX = getWidth() / 2;
+        centerY = getHeight() / 2;
+        baseRadius = Math.min(getWidth(), getHeight()) / 3;
+        hatRadius = Math.min(getWidth(), getHeight()) / 5;
+    }
+    //method to be called when Joystick surface is created
+    @Override
+    public void surfaceCreated(SurfaceHolder surfaceHolder)
+    {
+        setupDimensions();
+        drawJoystick(centerX, centerY);
+    }
+    //method to be called when Joystick surface is changed
+    @Override
+    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2)
+    {
+        setupDimensions();
+        drawJoystick(centerX,centerY);
+    }
+    //method to be called when Joystick sutface is destroyed
+    @Override
+    public void surfaceDestroyed(SurfaceHolder surfaceHolder)
+    {
+        UserHandler.getInstance().disconnect();
+    }
+    /*when Joystick is touched, method will be called and will compute values to be sent as
+    * arguments to the JoystickCallBack onJoystickMoved even handler*/
+    @Override
+    public boolean onTouch(View view, MotionEvent event)
+    {
+        if (view.equals(this))
+        {
+            if (event.getAction() != MotionEvent.ACTION_UP)
+            {
+                float displacement = (float) Math.sqrt((Math.pow(event.getX() - centerX, 2)) +
+                        Math.pow(event.getY() - centerY, 2));
+                if (displacement < baseRadius)
+                {
+                    drawJoystick(event.getX(), event.getY());
+                    joystickCallback.onJoystickMoved((centerX - event.getX()) / baseRadius,
+                            (event.getY() - centerY) / baseRadius, getId());
+                }
+                else {
+                    float ratio = baseRadius / displacement;
+                    float constrainedX = centerX + (event.getX() - centerX) * ratio;
+                    float constrainedY = centerY + (event.getY() - centerY) * ratio;
+                    drawJoystick(constrainedX, constrainedY);
+                    joystickCallback.onJoystickMoved((constrainedX - centerX) / baseRadius,
+                            (centerY - constrainedY) / baseRadius, getId());
+                }
+            } else {
+                drawJoystick(centerX, centerY);
+                joystickCallback.onJoystickMoved(0, 0, getId());
+            }
+        }
+        return true;
+    }
+    //draw the Joystick
+    private void drawJoystick(float x, float y)
+    {
+        if (getHolder().getSurface().isValid())
+        {
+            Canvas drawCanvas = this.getHolder().lockCanvas();
+            Paint colors = new Paint();
+            drawCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
+            colors.setARGB(255, 50, 50, 50);
+            drawCanvas.drawCircle(centerX, centerY, baseRadius, colors);
+            colors.setARGB(255, 0, 0, 255);
+            drawCanvas.drawCircle(x, y, hatRadius, colors);
+            getHolder().unlockCanvasAndPost(drawCanvas);
+        }
+    }
+    //inteface defining the onJoystickMoved event handler
+    public interface JoystickListener
+    {
+        void onJoystickMoved(float xPercent, float yPercent, int source);
+    }
+}