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This check includes the player’s height and the value of b to ensure the rectangle stops at the correct position (See figure 6 for an explanation).

Line 19 - A similar check to line 14 but checks if the player has reached the bottom of the screen instead.

Line 16 - Reset the player’s y position to value of b to prevent it from moving any further toward the top of the screen.

Or in other words, if the player has reached its boundary at the top of the screen.

Line 14 - The first line checks if the player’s y position is less than the value of b which was used to define the boundaries of the player’s movement.

Line 10 - This line will increase the player’s y position if the value of ydir is positive and decreases the player’s y position if the value of ydir is negative.

Its behavior can be described as follows:

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The getter method for the direction will allow the direction to be set on an object outside the class, and the setter methods for position, height, and width will allow these properties to be read on an object outside the class (see the implementation in figure 4).įigure 5: Shows the implementation of the player’s update method. This will ensure player objects do not refer to the same PVector object in memory which could have been the case if several player objects were given the same PVector object on instantiation. The constructor’s argument is designed with floats to represent the start position which within the constructor is used to create an instance of a new PVector object for the player’s position. The Player class also needs a constructor to set the initial values of the position and direction on the y-axis. getWidth()- A getter method that returns the player object’s width.getHeight() - A getter method that returns the player object’s height.getPosition() - A getter method that returns the player object’s position.setDirection(yDir) - A setter method that is used to update the player object’s direction on the y-axis.update() - A void method that is used to update the behavior of the player related to movement, boundaries check, and drawing of the visual object.The class also requires five methods (see figure 1), and each of these properties has the following purpose: For those of you never heard of a UML class diagram, it is simply a diagram with a system’s classes, properties, methods, and relations (Wikipedia, 2022b).įigure 3: Shows the implementation of properties in the player class. Figure 1 shows a UML class diagram containing the two classes. The game will contain two different classes, one to represent a player object, and another to represent the ball object. The first player should be controlled by the keyboard and the second player by the computer.

A player gets a point whenever the ball moves out of the screen on the opposite side.The ball object’s position and direction should be reset if it moves out of the screen on the x-axis.The ball object should change its direction on the y axis to the opposite if it moves out of the screen on the y-axis.The ball object should change its direction on the x-axis to the opposite if it overlaps with a player object.The ball object should be able to move on the x-, and y-axis.The player object should only be able to move on the y-axis.The game should contain two text elements showing each player’s score.The ball object should be represented by a circle.The player object should be represented by a rectangle.

The second part describes the functional requirements of how the different objects and the application should behave. The first part describes the visual requirements related to representing the players, ball, and environment. The requirements of the game are presented in two different parts. Processing provides a graphical library and an integrated development environment (IDE) and it uses the programming language Java (Wikipedia, 2022a).

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To download Processing go to /download and choose the version matching the preferred platform.

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I have also written another article on how to recreate the classic snake game if you want to create another game. Public static int heal = rand.A GIF showing the Ping-pong game from this article.Īre you looking for a tutorial explaining how to recreate the classic Ping-pong game? Then, look no further, this article focuses on recreating the game using the Processing library and Java. Public static int dam = rand.nextInt(6) + 1 Static Scanner UI = new Scanner(System.in)

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However, this code seems a little clunky and I'm pretty sure there is a better way of doing most things in the code. I'm trying to make a text-based game and I think I've got a good start.