// Tyler Rigsby, CSE 142
// Does an animation of a ball falling down
import java.awt.*;

public class BallDemo {
	public static void main(String[] args) {
		DrawingPanel panel = new DrawingPanel(500, 500);
		Graphics g = panel.getGraphics();
		
		double ball1X = 150.0;
		double ball1Y = 50.0;
		
		double ball1V0 = 15.0;
		double ball1A = 40.0;
		
		for (double t = 0.0; t <= 20.0; t += .05) {
			double ball1Loc = ball1Y + displacement(ball1A, ball1V0, t);
			g.fillOval((int) ball1X, (int) ball1Loc, 30, 30);
			panel.sleep(50);
			panel.clear();
		}
	}
	
	// Returns the displacement of an object given acceleration a, 
	// initial velocity v0, and time t
	public static double displacement(double a, double v0, double t) {
		return 0.5 * a * t * t + v0 * t;
	}
}