Specification for the classes:

The Drawable class In lecture we discussed how we can used object-oriented programming concepts to make graphics applications more organized and easier to create. One of the things that well leverage is inheritance, polymorphism, and abstract base classes. Your first task will be to create your own version of the Drawable abstract base class (similar to the one we used in class last week). This class should have the following attributes: position: x and y location for the center of the object visible: - A Boolean variable (True or False) such that if True the object is draw, if False it is not. Although you may not choose to use this attribute, it could be useful. and the following abstract methods: draw: Takes as a parameter a surface to draw on. get_rect - returns a Pygame Rect object that is the bounding rectangle that fits tightly around your object. Feel free to implement constructors, inspector and mutator methods, along with addition attributes and methods as you see fit. Put all this code in a file name Drawable.py The Ball class The Ball class inherits from Drawable and it will draw a circle at its current location. You must implement at the very least, the required methods of the base class (draw and get_rect), as well as a constructor. You may need to implement other methods as part of the public interface. Put all this code in a file name Ball.py

Block class The Block class inherits from Drawable and it will draw a square with a black outline at its current location. You must implement at the very least, the required methods of the base class (draw and get_rect), as well as a constructor. You may need to implement other methods as part of the public interface. Put all this code in a file name Block.py The Text class The Text class inherits from Drawable and it will be used to display the players score. You must implement at the very least, the required methods of the base class (draw and get_rect), as well as a constructor. You may need to implement other methods as part of the public interface. Put all this code in a file name Text.py The main Script Set up the scene In the file hw4.py initialize Pygame and create a window. In this window put a black line (a ground plane) across the window. It might help to make this line a Drawable derived class. Next, add an instance of the Ball class at a starting location of your choice. Finally, create at least 6 instances of the Block class, placed throughout the scene. They are the targets for the ball. In addition, place a Text object at the top of the window to display the score

The animation: Launching the Ball We want to launch our ball by dragging the mouse. The difference in locations between when you start dragging and the stop will determine the velocity and angle of the initial trajectory of the ball. We will use some physics to determine the velocity and angle. Add to your main loop handling for MOUSEBUTTONUP and MOUSEBUTTONDOWN events. When MOUSEBUTTONDOWN or MOUSEBUTTONUP occurs: Store the respective mouse location On MOUSEBUTTONUP o Compute the initial x-velocity, xv, as the difference in the x-coordinates when the mouse was depressed vs released. o Compute the initial y-velocity, yv, as negative one times the difference in the y-coordinates when the mouse was depressed vs released. Remember: The positive yaxis points down in Pygame. After launching the ball (which will initialize xv and yv, as long as |yv| < 0.0001 you should update the balls position at the end of your game loop. But first we must define a few constants: Create a variable, dt, to store the delta time. You can play with this parameter, but as default set it as 0.1 Create a variable g, for gravity. Set it to 6.67 Create a variable R, which is the rebound constant. Set it to 0.7 Create a variable eta, which is the coefficient of friction constant. Set it to 0.5 Now, our update rules for the ball are as follows: The balls x-coordinate should increase by dt xv The balls y-coordinate should decrease by dt yv If the ball is below the ground (y > 400), we want to reverse its y-velocity by some amount and reduce the x-velocity (to account for friction). In particular yv = R yv and xv = eta xv Otherwise (if the ball is above the ground), set yv = yv g dt

the programming language is python