// This program animates a ball moving at a particular angle and with
// a particular velocity.

import java.awt.*;
import java.util.*;

public class Ball2 {
    public static void main(String[] args) {
    
        Scanner console = new Scanner(System.in);
      
	    // get angle and velocity from the user
        System.out.println("Enter Velocity: ");
        double velocity = console.nextDouble();
        System.out.println("Enter Angle: ");
        double angle = console.nextDouble();
        
		// find the xVelocity and yVelocity based on the angle and velocity
        double xVelocity =  velocity * Math.cos(Math.toRadians(angle));
        double yVelocity = -velocity * Math.sin(Math.toRadians(angle));

        int seconds = 100;

        // set up Drawing Panel
        DrawingPanel p = new DrawingPanel(600, 600);
        p.setBackground(Color.CYAN);
        Graphics g = p.getGraphics();

        // draw initial ball
        double x = 300.0;
        double y = 300.0;
        g.fillOval((int) x - 5, (int) y - 5, 10, 10);
		
		//pause two seconds
        p.sleep(2000);


        for (int i = 1; i <= 10 * seconds; i++) {
            // cover old ball with white
            g.setColor(Color.WHITE);
            g.fillOval((int) x - 5, (int) y - 5, 10, 10);
            
            // move ball
            x = x + xVelocity / 10.0;
            y = y + yVelocity / 10.0;
			//bounce ball (change direction if at wall)
            if (x <= 5 || x >= 595) {
                xVelocity = -xVelocity;
            }
            if (y <= 5 || y >= 595) {
                yVelocity = -yVelocity;
            }
            // draw new ball
            g.setColor(Color.BLACK);
            g.fillOval((int) x - 5, (int) y - 5, 10, 10);
            
			//pause .1 seconds
            p.sleep(100);
        }
    }
}