The Ring programming language version 1.2 book - Part 35 of 84
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The document discusses using the RingLibSDL library to create games in Ring using SDL, SDL_image, SDL_ttf, and SDL_mixer. It provides examples of how to create a window, display images, switch between images, draw rectangles, use TTF fonts, handle events like closing the window, mouse events, and playing sounds. The examples demonstrate basic 2D game programming tasks like initializing libraries, loading assets, rendering to the screen, getting input, and playing audio.
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The Ring programming language version 1.2 book - Part 35 of 84
- 1. Ring Documentation, Release 1.2 Screen Shot: 43.6 Using Threads In this example we will learn how to use threads from the Allegro library Load "gamelib.ring" o1 = new mythreads Func Main al_init() for k = 1 to 5 al_create_thread("o1.thread1()") al_create_thread("o1.thread2()") al_create_thread("o1.thread3()") next al_rest(2) Class Mythreads cAppName = "Threads Application" 43.6. Using Threads 320
- 2. Ring Documentation, Release 1.2 Func Thread1 for x = 1 to 5 see x + nl next See 'Thread(1) : Application Name : ' + cAppName + nl Func Thread2 for x = 1 to 5 see '*****' + x + nl next See 'Thread(2) : Application Name : ' + cAppName + nl Func Thread3 for x = 1 to 5 see '!!!!' + x + nl next See 'Thread(3) : Application Name : ' + cAppName + nl Output: 1 2 3 4 5 Thread(1) : Application Name : Threads Application *****1 *****2 *****3 *****4 *****5 Thread(2) : Application Name : Threads Application !!!!1 !!!!2 !!!!3 !!!!4 !!!!5 Thread(3) : Application Name : Threads Application 1 2 3 4 5 Thread(1) : Application Name : Threads Application !!!!1 !!!!2 !!!!3 !!!!4 !!!!5 Thread(3) : Application Name : Threads Application *****1 *****2 *****3 *****4 *****5 Thread(2) : Application Name : Threads Application *****1 *****2 43.6. Using Threads 321
- 3. Ring Documentation, Release 1.2 *****3 *****4 *****5 Thread(2) : Application Name : Threads Application !!!!1 !!!!2 !!!!3 !!!!4 !!!!5 Thread(3) : Application Name : Threads Application 1 2 3 4 5 Thread(1) : Application Name : Threads Application *****1 *****2 *****3 *****1 *****4 *****2 !!!!1 *****5 *****3 1 !!!!2 Thread(2) : Application Name : Threads Application 1 *****4 !!!!1 2 !!!!3 !!!!4 *****5 !!!!2 3 2 !!!!5 Thread(2) : Application Name : Threads Application !!!!3 4 3 Thread(3) : Application Name : Threads Application !!!!4 5 4 !!!!5 Thread(1) : Application Name : Threads Application 5 Thread(3) : Application Name : Threads Application Thread(1) : Application Name : Threads Application 43.6. Using Threads 322
- 4. CHAPTER FORTYFOUR USING RINGLIBSDL In this chapter we will learn about using RingLibSDL to create games based on the LibSDL, SDLImage, SDLTTF and SDLMixer libraries. Tip: RingLibSDL is not distributed with the binary releases for desktop which uses RingAllegro Note: To use RingLibSDL, Check ring/android/ringlibsdl folder. 44.1 Create Window Example: Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN) SDL_Delay(2000) SDL_DestroyWindow(win) SDL_Quit() 44.2 Display Image Example: Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN) ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC ) bmp = SDL_LoadBMP("hello.bmp") tex = SDL_CreateTextureFromSurface(ren,bmp) SDL_FreeSurface(bmp) SDL_RenderClear(ren) SDL_RenderCopy2(ren,tex) SDL_RenderPresent(ren) SDL_Delay(2000) SDL_DestroyTexture(tex) SDL_DestroyRenderer(ren) SDL_DestroyWindow(win) SDL_Quit() 323
- 5. Ring Documentation, Release 1.2 44.3 Switch between two images Example: Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN) ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC ) bmp = SDL_LoadBMP("hello.bmp") tex = SDL_CreateTextureFromSurface(ren,bmp) SDL_FreeSurface(bmp) bmp = SDL_LoadBMP("hello2.bmp") tex2 = SDL_CreateTextureFromSurface(ren,bmp) SDL_FreeSurface(bmp) for x = 1 to 10 showtex(tex) showtex(tex2) next SDL_DestroyTexture(tex) SDL_DestroyTexture(tex2) SDL_DestroyRenderer(ren) SDL_DestroyWindow(win) SDL_Quit() func showtex oTex SDL_RenderClear(ren) SDL_RenderCopy2(ren,oTex) SDL_RenderPresent(ren) SDL_Delay(200) 44.4 Draw Rectangle Example: Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN) ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC ) SDL_RenderClear(ren) rect = sdl_new_sdl_rect() sdl_set_sdl_rect_x(rect,10) sdl_set_sdl_rect_y(rect,10) sdl_set_sdl_rect_w(rect,100) sdl_set_sdl_rect_h(rect,100) SDL_SetRenderDrawColor(ren,255,255,255,255) SDL_RenderDrawRect(ren,rect) sdl_destroy_sdl_rect(rect) SDL_RenderPresent(ren) SDL_Delay(2000) SDL_DestroyRenderer(ren) SDL_DestroyWindow(win) SDL_Quit() 44.3. Switch between two images 324
- 6. Ring Documentation, Release 1.2 44.5 Display PNG Images Example: Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN) ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC ) bmp = IMG_Load("hello3.png") tex = SDL_CreateTextureFromSurface(ren,bmp) SDL_FreeSurface(bmp) SDL_RenderClear(ren) SDL_RenderCopy2(ren,tex) SDL_RenderPresent(ren) SDL_Delay(2000) SDL_DestroyTexture(tex) SDL_DestroyRenderer(ren) SDL_DestroyWindow(win) SDL_Quit() 44.6 Use TTF Fonts Example: Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN) ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC ) SDL_RenderClear(ren) TTF_Init() font = TTF_OpenFont("pirulen.ttf", 16) color = sdl_new_sdl_color() sdl_set_sdl_color_r(color,0) sdl_set_sdl_color_g(color,255) sdl_set_sdl_color_b(color,0) text = TTF_RenderText_Solid(font,"Welcome to the Ring language",color) surface = SDL_GetWindowSurface(win) SDL_BlitSurface(text, nullpointer(), surface, nullpointer()) SDL_UpdateWindowSurface(win) SDL_Delay(2000) SDL_Destroy_SDL_Color(color) SDL_FreeSurface(text) TTF_CloseFont(font) SDL_DestroyRenderer(ren) SDL_DestroyWindow(win) SDL_Quit() 44.7 Display Transparent Images Example: 44.5. Display PNG Images 325
- 7. Ring Documentation, Release 1.2 Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) flags = IMG_INIT_JPG | IMG_INIT_PNG IMG_Init(flags) win = SDL_CreateWindow("Hello World!", 100, 100, 800, 600, SDL_WINDOW_SHOWN) ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC ) bmp = IMG_Load("stars.jpg") tex = SDL_CreateTextureFromSurface(ren,bmp) SDL_FreeSurface(bmp) SDL_RenderClear(ren) SDL_RenderCopy(ren,tex,nullpointer(),nullpointer()) SDL_DestroyTexture(tex) bmp = IMG_Load("player.png") # Image - Set Transparent color (white) myformat = sdl_get_sdl_surface_format(bmp) white = SDL_MapRGB(myformat, 255, 255, 255) SDL_SetColorKey(bmp, SDL_True, white) tex = SDL_CreateTextureFromSurface(ren,bmp) SDL_FreeSurface(bmp) rect = sdl_new_sdl_rect() sdl_set_sdl_rect_x(rect,0) sdl_set_sdl_rect_y(rect,0) sdl_set_sdl_rect_w(rect,100) sdl_set_sdl_rect_h(rect,100) SDL_RenderCopy(ren,tex,nullpointer(),rect) SDL_SetTextureBlendMode(tex,2) SDL_SetTextureAlphaMod(tex,255) sdl_set_sdl_rect_x(rect,200) sdl_set_sdl_rect_y(rect,200) sdl_set_sdl_rect_w(rect,100) sdl_set_sdl_rect_h(rect,100) SDL_RenderCopy(ren,tex,nullpointer(),rect) SDL_DestroyTexture(tex) SDL_Destroy_SDL_Rect(rect) SDL_RenderPresent(ren) SDL_Delay(2000) SDL_DestroyRenderer(ren) SDL_DestroyWindow(win) SDL_Quit() 44.8 Close Window Event Example: Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) 44.8. Close Window Event 326
- 8. Ring Documentation, Release 1.2 win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN) myevent = sdl_new_sdl_event() while true thevent = sdl_pollevent(myevent) switch sdl_get_sdl_event_type(myevent) on sdl_get_sdl_quit() exit on sdl_get_sdl_keydown() Key = SDL_GET_SDL_Event_key_keysym_sym(myevent) if key = 27 exit ok off end SDL_DestroyWindow(win) SDL_Quit() 44.9 Mouse Events Example: Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) win = SDL_CreateWindow("Mouse Events ", 100, 100, 640, 480, SDL_WINDOW_SHOWN) TTF_Init() font = TTF_OpenFont("pirulen.ttf", 16) color = sdl_new_sdl_color() sdl_set_sdl_color_r(color,0) sdl_set_sdl_color_g(color,255) sdl_set_sdl_color_b(color,0) surface = SDL_GetWindowSurface(win) myevent = sdl_new_sdl_event() while true cMsg = "" sdl_pollevent(myevent) switch sdl_get_sdl_event_type(myevent) on SDL_QUIT exit on SDL_KEYDOWN Key = SDL_GET_SDL_Event_key_keysym_sym(myevent) if key = 27 exit ok on SDL_MOUSEBUTTONDOWN if sdl_get_Sdl_Event_button_button(myevent) = SDL_BUTTON_LEFT SDL_SETWINDOWTITLE(win, " Button_Left_Down " ) but sdl_get_Sdl_Event_button_button(myevent) = SDL_BUTTON_MIDDLE SDL_SETWINDOWTITLE(win, " Button_Middle_Down " ) but sdl_get_Sdl_Event_button_button(myevent) = SDL_BUTTON_RIGHT SDL_SETWINDOWTITLE(win, " Button_Right_Down " ) ok on SDL_MOUSEMOTION 44.9. Mouse Events 327
- 9. Ring Documentation, Release 1.2 sdl_fillrect(surface,nullpointer(),0) if sdl_get_sdl_event_motion_xrel(myevent) < 0 cMsg += " Left " else cMsg += " Right " ok if sdl_get_sdl_event_motion_yrel(myevent) < 0 cMsg += " Up " else cMsg += " Down " ok cMsg += " x = " + sdl_get_sdl_event_motion_x(myevent) cMsg += " y = " + sdl_get_sdl_event_motion_y(myevent) showmsg(cMsg) off end SDL_Destroy_SDL_Color(Color) TTF_CloseFont(font) SDL_DestroyWindow(win) SDL_Quit() func showmsg mymsg text = TTF_RenderText_Solid(font,mymsg,color) SDL_BlitSurface(text, nullpointer(), surface, nullpointer()) SDL_UpdateWindowSurface(win) SDL_FreeSurface(text) 44.10 Play Sound Example: Load "libsdl.ring" SDL_Init(SDL_INIT_EVERYTHING) win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN) Mix_OpenAudio( 44100, MIX_DEFAULT_FORMAT , 2, 10000) Mix_AllocateChannels(4) sound = Mix_LoadWav( "sound.wav" ) Mix_VolumeChunk(sound,1) Mix_PlayChannel(1,sound,0) myevent = sdl_new_sdl_event() while true thevent = sdl_pollevent(myevent) switch sdl_get_sdl_event_type(myevent) on sdl_get_sdl_quit() exit on sdl_get_sdl_keydown() Key = SDL_GET_SDL_Event_key_keysym_sym(myevent) if key = 27 exit ok off end Mix_FreeChunk( sound ) Mix_CloseAudio() 44.10. Play Sound 328
- 10. Ring Documentation, Release 1.2 Mix_Quit() SDL_DestroyWindow(win) SDL_Quit() 44.10. Play Sound 329