import javafx.scene.paint.Color;
import javafx.scene.canvas.GraphicsContext;
public class Ball implements Drawable
{
    private final double x;
    private final double y;
    private final double radius;
    private final Color color;
    public Ball(double x, double y, double radius, Color color)
    {
        this.x = x;
        this.y = y;
        this.radius = radius;
        this.color = color;
    }
    public void draw(GraphicsContext pen)
    {
        pen.setFill(color);
        pen.fillOval(x - radius, y - radius, 2*radius, 2*radius);
    }
}