The Ring programming language version 1.7 book - Part 53 of 196
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This document provides documentation on Ring's game engine and graphics libraries. It describes: 1) The gl_allegro and gl_libsdl libraries that provide a common interface to Allegro and SDL graphics libraries to allow switching between them. 2) The main classes in the game engine like Game, GameObject, Sprite, Text, Animate, Sound and Map that can be used to build games. 3) How to use the game engine classes through declarative programming to create games, including examples showing text, sound, animation and functions.
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The Ring programming language version 1.7 book - Part 53 of 196
- 1. Ring Documentation, Release 1.7 55.3 Interface to graphics library In this layer we have gl_allegro.ring and gl_libsdl.ring Each library provides the same functions to be used with interacting with the Graphics Library. This layer hides the details and the difference between RingAllegro and RingLibSDL. You have the same functions, Just use it and you can switch between Allegro and LibSDL at anytime. Why ? Allegro is very simple, we can use it to quickly create 2D games for Windows, Linux and MacOS X. In Ring 1.0 we started by supporting Allegro. Also LibSDL is very powerful and popular, very easy to use for Mobile Development. Ring 1.1 comes with support for LibSDL so we can quickly create games for Mobile. Note: We can use just one library for Desktop and Mobile development. • gl_allegro.ring source code : https://github.com/ring-lang/ring/blob/master/ringlibs/gameengine/gl_allegro.ring • gl_libsdl.ring source code : https://github.com/ring-lang/ring/blob/master/ringlibs/gameengine/gl_libsdl.ring 55.4 Game Engine Classes The Engine comes with the next classes • GameBase class • Resources class • Game class • GameObject class • Sprite class • Text class • Animate class • Sound class • Map class • Source Code : https://github.com/ring-lang/ring/blob/master/ringlibs/gameengine/gameengine.ring 55.5 Games Layer In this layer we create our games using the Game Engine classes The classes are designed to be used through Declarative Programming. In our games we will use the next classes • Game class • Sprite class 55.3. Interface to graphics library 492
- 2. Ring Documentation, Release 1.7 • Text class • Animate class • Sound class • Map class Note: Other classes in the engine are for internal use by the engine. We will introduce some examples and three simple games :- • Stars Fighter Game • Flappy Bird 3000 Game • Super Man 2016 Game 55.6 Game Class The next table present the class attributes. Attributes Description FPS Number determines how many times the draw() method will be called per second. FixedFPS Number determines how many times the animate() method will be called per second. Title String determines the window title of the game. aObjects List contains all objects in the game shutdown True/False value to end the game loop The next table present the class methods. Method Description refresh() Delete objects. settitle(cTitle) Set the window title using a string parameter. shutdown() Close the application. The next table present a group of keywords defined by the class. Keyword Description sprite Create new Sprite object and add it to the game objects. text Create new Text object and add it to the game objects. animate Create new Animate object and add it to the game objects. sound Create new Sound object and add it to the game objects. map Create new Map object and add it ot the game objects. 55.7 GameObject Class The next table present the class attributes. 55.6. Game Class 493
- 3. Ring Documentation, Release 1.7 Attributes Description enabled True/False determine the state of the object (Active/Not Active) x Number determine the x position of the object. y Number determine the y position of the object. width Number determine the width of the object. height Number determine the height of the object. nIndex Number determine the index of the object in objects list. animate True/False to animate the object or not. move True/False to move the object using the keyboard or not. Scaled True/False to scale the object image or not. draw Function to be called when drawing the object. state Function to be called for object animation. keypress Function to be called when a key is pressed. mouse Function to be called when a mouse event happens. The next table present the class methods. Method Description keyboard(oGame,nkey) Check Keyboard Events mouse(oGame,nType,aMouseList) Check Mouse Events rgb(r,g,b) Return new color using the RGB (Red, Green and Blue) Values. 55.8 Sprite Class Parent Class : GameObject Class The next table present the class attributes. Attributes Description image String determine the image file name. point Number determine the limit of automatic movement of the object. direction Number determine the direction of movement. nstep Number determine the increment/decrement during movement. type Number determine the object type in the game (Optional). transparent True/False value determine if the image is transparent. The next table present the class methods. Method Description Draw(oGame) Draw the object 55.9 Text Class Parent Class : Sprite Class The next table present the class attributes. Attributes Description size Number determine the font size font String determine the font file name text String determine the text to be displayed color Number determine the color The next table present the class methods. 55.8. Sprite Class 494
- 4. Ring Documentation, Release 1.7 Method Description Draw(oGame) Draw the object 55.10 Animate Class Parent Class : Sprite Class The next table present the class attributes. Attributes Description frames Number determine the number of frames frame Number determine the active frame framewidth Number determine the frame width. animate True/False determine using animate or not. scaled True/False determine scaling image or not. The next table present the class methods. Method Description Draw(oGame) Draw the object 55.11 Sound Class Parent Class : GameObject Class The next table present the class attributes. Attributes Description file String determine the sound file name. once True/False determine to play the file one time or not (loop). The next table present the class methods. Method Description playsound() Play the sound file 55.12 Map Class Parent Class : Sprite Class The next table present the class attributes. Attributes Description aMap List determine the map content using numbers. aImages List determine the image used for each number in the map. BlockWidth Number determine the block width (default = 32). BlockHeight Number determine the block height (default = 32). Animate True/False determine the animation status. The next table present the class methods. Method Description getvalue(x,y) Return the item value in the Map according to the visible part 55.10. Animate Class 495
- 5. Ring Documentation, Release 1.7 55.13 Using the Game Engine - Creating the Game Window Load "gameengine.ring" # Give Control to the Game Engine func main # Called by the Game Engine oGame = New Game # Create the Game Object { title = "My First Game" } # Start the Events Loop Note: if you want to define global variables, this must be before load “gameengine.ring” because this instruction will give the control to the game engine. Screen Shot: 55.14 Using the Game Engine - Drawing Text Load "gameengine.ring" # Give Control to the Game Engine func main # Called by the Game Engine 55.13. Using the Game Engine - Creating the Game Window 496
- 6. Ring Documentation, Release 1.7 oGame = New Game # Create the Game Object { title = "My First Game" text { x = 10 y=50 animate = false size = 20 file = "fonts/pirulen.ttf" text = "game development using ring is very fun!" color = rgb(0,0,0) } } # Start the Events Loop Screen Shot: 55.15 Using the Game Engine - Moving Text Load "gameengine.ring" # Give Control to the Game Engine func main # Called by the Game Engine oGame = New Game # Create the Game Object 55.15. Using the Game Engine - Moving Text 497
- 7. Ring Documentation, Release 1.7 { title = "My First Game" text { x = 10 y=50 animate = false size = 20 file = "fonts/pirulen.ttf" text = "game development using ring is very fun!" color = rgb(0,0,0) # Color = black } text { x = 10 y=150 # Animation Part ===================================== animate = true # Use Animation direction = GE_DIRECTION_INCVERTICAL # Increase y point = 400 # Continue until y=400 nStep = 3 # Each time y+= 3 #===================================================== size = 20 file = "fonts/pirulen.ttf" text = "welcome to the real world!" color = rgb(0,0,255) # Color = Blue } } # Start the Events Loop Screen Shot: 55.15. Using the Game Engine - Moving Text 498
- 8. Ring Documentation, Release 1.7 55.16 Using the Game Engine - Playing Sound Load "gameengine.ring" # Give Control to the Game Engine func main # Called by the Game Engine oGame = New Game # Create the Game Object { title = "My First Game" text { x = 10 y=50 animate = false size = 20 file = "fonts/pirulen.ttf" text = "game development using ring is very fun!" color = rgb(0,0,0) # Color = black } text { x = 10 y=150 # Animation Part ====================================== animate = true # Use Animation direction = GE_DIRECTION_INCVERTICAL # Increase y 55.16. Using the Game Engine - Playing Sound 499
- 9. Ring Documentation, Release 1.7 point = 400 # Continue until y=400 nStep = 3 # Each time y+= 3 #====================================================== size = 20 file = "fonts/pirulen.ttf" text = "welcome to the real world!" color = rgb(0,0,255) # Color = Blue } Sound { # Play Sound file = "sound/music1.wav" # Sound File Name } } # Start the Events Loop 55.17 Using the Game Engine - Animation Load "gameengine.ring" # Give Control to the Game Engine func main # Called by the Game Engine oGame = New Game # Create the Game Object { title = "My First Game" animate { file = "images/fire.png" x = 100 y = 200 framewidth = 40 height = 42 nStep = 3 # Used for delay transparent = true state = func oGame,oSelf { # Called by engine each frame oSelf { nStep-- if nStep = 0 nStep = 3 if frame < 13 # we have 13 frames in animation frame++ # move to next frame else oGame.remove(oself.nIndex) # remove object ok ok } } } } # Start the Events Loop 55.17. Using the Game Engine - Animation 500
- 10. Ring Documentation, Release 1.7 55.18 Using the Game Engine - Animation and Functions Load "gameengine.ring" # Give Control to the Game Engine func main # Called by the Game Engine oGame = New Game # Create the Game Object { title = "My First Game" for x = 70 to 700 step 50 for y = 70 to 500 step 50 showfire(oGame,x,y) next next } # Start the Events Loop func showfire oGame,nX,nY oGame { animate { file = "images/fire.png" x = nX 55.18. Using the Game Engine - Animation and Functions 501