Object-Oriented Programming
Role-Playing Game
Winning Nakov's Handshake
Svetlin Nakov
Technical Trainer
www.nakov.com
Software University
http://softuni.bg
Table of Contents
1. What's an RPG game?
2. Game components
 Game Objects
 Game Engine
 Drawing Engine
2
What's a Role-Playing Game?
Role-Playing Game
 A Role-Playing Game (RPG) is a game where the player assumes
control of a character in a fantasy world
 Characters in the world interact with one another in several ways

E.g. talking, fighting, casting spells, doing quests
 There are various other objects such as items, buildings,
computer-controlled units (NPCs)
 Players aim to level up, acquire items, complete quests, etc.
Game Components
Game Object Hierarchy
 Game Object Hierarchy
 A hierarchy that models the object world of the game
 Classes represent game objects

Each object holds its own data and behavior
 Exists independently from any other game components (engine,
UI, Input interface, etc.)
6
Class Structure – Example
7
Game Engine
 The game engine processes the game flow
 What game flow?
 Processing player input
 Creating objects (players, enemies, items, events, etc.)
 Handling object interactions, collision and other game logic
 In order to do all this, the game engine enters the so called
"game loop"

Infinite loop with a set interval between each iteration

Updates the state of the game
8
Drawing Engine (UI)
 Draws graphics to the user interface
 Knows only how to draw on the screen

Adding objects

Removing objects

Redrawing existing objects
 Is not concerned with any game logic
 Called by the game engine when drawing needs to be done
 Collects the user input (mouse / keyboard / joystick / touch)
9
Creating an RPG from Scratch
Live Demo
Role-Playing Game
?
https://softuni.bg/trainings/coursesinstances/details/8
License
 This course (slides, examples, demos, videos, homework, etc.)
is licensed under the "Creative Commons AttributionNonCommercial-ShareAlike 4.0 International" license
 Attribution: this work may contain portions from

"OOP" course by Telerik Academy under CC-BY-NC-SA license
12
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