BOLA BANG VANDY

package com.billy.accelerator;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

import java.util.Formatter;
import java.util.Random;

public class Ball extends View {

    private int xMin = 0;
    private int xMax;
    private int yMin = 0;
    private int yMax;
    private float ballRadius = 80, ballX = ballRadius + 20, ballY = ballRadius + 20, ballSpeedX = 0, ballSpeedY = 0;
    private RectF ballBounds;
    private Paint paint ;
    public boolean touch = false;

    public float rx, ry, currentX, currentY;

    private Context c;

    private StringBuilder statusMsg = new StringBuilder();
    private Formatter formatter = new Formatter(statusMsg);

    public Ball(Context context) {
        super(context);
        c = context;
        ballBounds = new RectF();
        paint = new Paint();

        paint.setTypeface(Typeface.MONOSPACE);
        paint.setTextSize(50);

        this.setFocusableInTouchMode(true);
    }

    int x = 0, y = 1;

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        ballBounds.set(rx-ballRadius, ry-ballRadius, rx+ballRadius, ry+ballRadius);
        paint.setColor((Color.BLUE));
        canvas.drawOval(ballBounds, paint);

        canvas.drawText(String.valueOf(statusMsg), 0, 50 ,paint);

        MainActivity mc = (MainActivity)c;

        this.ballSpeedX = mc.getX();
        this.ballSpeedY = mc.getY();

        update();

        try{
            Thread.sleep(1);
        }catch (Exception e){
            e.printStackTrace();
        }
        invalidate();

    }

    public void update() {
        rx += ballSpeedX;
        ry += ballSpeedY;

        if (currentX < rx + ballRadius && currentX > rx - ballRadius && touch) {
            ballSpeedX = 0;
        }

        if (currentY< ry + ballRadius && currentY > ry - ballRadius && touch) {
            ballSpeedY = 0;
        }

        if(currentX > rx + ballRadius && touch){
            ballSpeedX = 16;
        }else if(currentX < rx + ballRadius && touch){
            ballSpeedX = -16;
        }

        if(currentY > ry + ballRadius && touch){
            ballSpeedY = 16;
        }else if(currentY < ry + ballRadius && touch){
            ballSpeedY = -16;
        }

        statusMsg.delete(0, statusMsg.length());
        formatter.format("Ball@(%3.0f, %3.0f).Speed=(%2.0f, %2.0f)", rx, rx, ballSpeedX, ballSpeedY);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        currentX = event.getX();
        currentY = event.getY();

        if(event.getAction() == MotionEvent.ACTION_DOWN){
            touch = true;
            if(event.getAction() == MotionEvent.ACTION_MOVE){
                currentX = event.getX();
                currentY = event.getY();
            }
        }

        if(event.getAction() == MotionEvent.ACTION_UP){
            ballSpeedX = 0;
            ballSpeedY = 0;
            touch = false;
        }

        return true;
    }

    @Override
    public void onSizeChanged(int w, int h, int oldW, int oldH) {
        xMax = w - 1;
        yMax = h - 1;

        rx = new Random().nextFloat() * (xMax - ballX) + ballRadius;
        ry = new Random().nextFloat() * (yMax - ballY) + ballRadius;
    }
}