This document discusses using the RingLibSDL library to create games in Ring using the SDL, SDL_image, SDL_ttf, and SDL_mixer libraries. It provides examples of how to create a window, display images, switch between images, draw rectangles, display PNGs, use TTF fonts, display transparent images, handle window close events, mouse events, and play sounds.
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The Ring programming language version 1.7 book - Part 51 of 196
1. Ring Documentation, Release 1.7
52.5 Display Transparent Image
The next example display image with white background on another image
Load "gamelib.ring"
al_init()
al_init_image_addon()
display = al_create_display(640,480)
imageback = al_load_bitmap("palace.jpg")
al_draw_bitmap(imageback,0,0,0)
image = al_load_bitmap("man4.png")
al_convert_mask_to_alpha(image,al_map_rgb(255,255,255))
al_draw_bitmap(image,0,0,0)
al_flip_display()
al_rest(10)
al_destroy_bitmap(image)
al_destroy_display(display)
52.5. Display Transparent Image 472
2. Ring Documentation, Release 1.7
Screen Shot:
52.6 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"
52.6. Using Threads 473
3. Ring Documentation, Release 1.7
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
52.6. Using Threads 474