The document discusses using the Allegro game programming library in Ring applications. It provides an example that initializes Allegro, draws and animates objects on screen, and handles input from keyboard and mouse. Key aspects covered include initializing Allegro, drawing bitmaps, clearing the display, flipping display, registering event sources, and handling input events. The example animates a bouncing rectangle that can be controlled with keyboard or mouse.

1. Ring Documentation, Release 1.5.4
### Send URL+Crumb to Yahoo to fetch 1st stock history data,
$url = "https://query1.finance.yahoo.com/v7/finance/download/AMZN?period1=1277856000&period2=
curl_easy_setopt(curl, CURLOPT_URL, $url);
cStr = curl_easy_perform_silent(curl)
See cStr
curl_easy_cleanup(curl) ### REMEMBER to CLOSE CURL
Output:
myCrumb.: |sEEeW97mxvN|
Date,Open,High,Low,Close,Adj Close,Volume
2010-07-05,110.650002,117.480003,109.000000,117.260002,117.260002,21000400
2010-07-12,117.809998,124.879997,117.320000,118.489998,118.489998,29407300
2010-07-19,118.379997,121.250000,105.800003,118.870003,118.870003,74252100
48.5. Get Stock Data From Yahoo 425

2. CHAPTER
FORTYNINE
USING RINGZIP
In this chapter we will learn about using RingZip
49.1 Create Zip File
Example : Create myfile.zip contains 4 files
load "ziplib.ring"
oZip = zip_openfile("myfile.zip",'w')
zip_addfile(oZip,"test.c")
zip_addfile(oZip,"zip.c")
zip_addfile(oZip,"zip.h")
zip_addfile(oZip,"miniz.h")
zip_close(oZip)
49.2 Extract Zip File
Example : Extract myfile.zip to myfolder folder.
load "ziplib.ring"
zip_extract_allfiles("myfile.zip","myfolder")
49.3 Print Files in Zip file
Example : Print file names in the myfile.zip
load "ziplib.ring"
oZip = zip_openfile("myfile.zip",'r')
for x=1 to zip_filescount(oZip)
see zip_getfilenamebyindex(oZip,x) + nl
next
zip_close(oZip)
49.4 Using RingZip Classes
The RingZip library comes with two classes. The Zip class and the ZipEntry class.
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Example (1):
load "ziplib.ring"
new Zip {
setFileName("myfile.zip")
open("w")
newEntry() {
open("test.c")
writefile("test.c")
close()
}
close()
}
Example (2):
load "ziplib.ring"
new Zip {
SetFileName("myfile.zip")
Open("w")
AddFile("test.c")
AddFile("zip.c")
AddFile("zip.h")
AddFile("miniz.h")
Close()
}
Example (3):
load "ziplib.ring"
new zip {
SetFileName("myfile.zip")
ExtractAllFiles("myfolder")
}
Example (4):
load "ziplib.ring"
new Zip {
SetFileName("myfile.zip")
Open("r")
see FilesCount()
Close()
}
Example (5):
load "ziplib.ring"
new Zip {
SetFileName("myfile.zip")
Open("r")
for x = 1 to filescount()
See GetFileNameByIndex(x) + nl
next
Close()
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4. Ring Documentation, Release 1.5.4
}
49.5 Zip Class Reference
Methods:
Method Description/Output
SetFileName(cName) Set the Zip file name
GetFileName() Return the Zip file name
Open(cMode) Open File, cMode = “a”, “w” or “r”
Close() Close the Zip File
AddFile(cFileName) Add file to the Zip file
ExtractAllFiles(cFolder) Extract all files from the Zip file
FilesCount() Return files count in the Zip file
GetFileNameByIndex(nIndex) Return file name in the Zip file by file index
NewEntry() Create new ZipEntry object
49.6 ZipEntry Class Reference
Methods:
Method Description/Output
Open(cFileName) Open new Entry
WriteFile(cFileName) Write File to the Entry
WriteString(cString) Write String to the Entry
Close() Close the Entry
49.5. Zip Class Reference 428

5. CHAPTER
FIFTY
GRAPHICS AND 2D GAMES PROGRAMMING USING RINGALLEGRO
In this chapter we will learn how to use the allegro game programming library in our Ring applications.
We have the file gamelib.ring that load the DLL library that contains wrappers for the Allegro functions
Load "allegro.rh"
Loadlib("ring_allegro.dll")
The file gamelib.ring uses the Load instruction to execute the file allegro.rh which is a ring source code file con-
tains constants to be used in our programs. Then using the function LoadLib() we can load the DLL library
“ring_allegro.dll”.
To write portable code we can change the gamelib.ring to check the platform before loading the DLL/So file.
50.1 Drawing, Animation and Input
The next example uses the Allegro library for drawing, moving objects on the screen and getting input from the
keyboard and the mouse.
Load "gamelib.ring"
al_init()
al_init_image_addon()
display = al_create_display(640,480)
al_show_native_message_box(display, "Hello", "Welcome",
"Using Allegro from the Ring programming language",
"", 0);
al_clear_to_color(al_map_rgb(0,0,255))
BOUNCER_SIZE = 40
bouncer_x = 10
bouncer_y = 20
bouncer = al_create_bitmap(BOUNCER_SIZE, BOUNCER_SIZE)
al_set_target_bitmap(bouncer)
al_clear_to_color(al_map_rgb(255,0,255))
for x = 1 to 30
bouncer_x += x
bouncer_y += x
al_set_target_bitmap(al_get_backbuffer(display))
al_clear_to_color(al_map_rgb(0,0,0))
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6. Ring Documentation, Release 1.5.4
al_draw_bitmap(bouncer, bouncer_x, bouncer_y, 0)
al_draw_bitmap(bouncer, 200+bouncer_x,200+ bouncer_y, 0)
al_flip_display()
al_rest(0.1)
next
al_clear_to_color(al_map_rgb(255,255,255))
image = al_load_bitmap("man2.jpg")
al_draw_bitmap(image,200,200,0)
al_flip_display()
al_rest(2)
event_queue = al_create_event_queue()
al_register_event_source(event_queue, al_get_display_event_source(display))
ev = al_new_allegro_event()
timeout = al_new_allegro_timeout()
al_init_timeout(timeout, 0.06)
FPS = 60
timer = al_create_timer(1.0 / FPS)
al_register_event_source(event_queue, al_get_timer_event_source(timer))
al_start_timer(timer)
redraw = true
SCREEN_W = 640
SCREEN_H = 480
BOUNCER_SIZE = 32
bouncer_x = SCREEN_W / 2.0 - BOUNCER_SIZE / 2.0
bouncer_y = SCREEN_H / 2.0 - BOUNCER_SIZE / 2.0
bouncer_dx = -4.0
bouncer_dy = 4.0
al_install_mouse()
al_register_event_source(event_queue, al_get_mouse_event_source())
al_install_keyboard()
al_register_event_source(event_queue, al_get_keyboard_event_source())
KEY_UP = 1
KEY_DOWN = 2
KEY_LEFT = 3
KEY_RIGHT = 4
Key = [false,false,false,false]
while true
al_wait_for_event_until(event_queue, ev, timeout)
switch al_get_allegro_event_type(ev)
on ALLEGRO_EVENT_DISPLAY_CLOSE
exit
on ALLEGRO_EVENT_TIMER
# Animation
if bouncer_x < 0 or bouncer_x > SCREEN_W - BOUNCER_SIZE
bouncer_dx = -bouncer_dx
ok
if bouncer_y < 0 or bouncer_y > SCREEN_H - BOUNCER_SIZE
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bouncer_dy = -bouncer_dy
ok
bouncer_x += bouncer_dx
bouncer_y += bouncer_dy
# Keyboard
if key[KEY_UP] and bouncer_y >= 4.0
bouncer_y -= 4.0
ok
if key[KEY_DOWN] and bouncer_y <= SCREEN_H - BOUNCER_SIZE - 4.0
bouncer_y += 4.0
ok
if key[KEY_LEFT] and bouncer_x >= 4.0
bouncer_x -= 4.0
ok
if key[KEY_RIGHT] and bouncer_x <= SCREEN_W - BOUNCER_SIZE - 4.0
bouncer_x += 4.0
ok
redraw = true
on ALLEGRO_EVENT_MOUSE_AXES
bouncer_x = al_get_allegro_event_mouse_x(ev)
bouncer_y = al_get_allegro_event_mouse_y(ev)
on ALLEGRO_EVENT_MOUSE_ENTER_DISPLAY
bouncer_x = al_get_allegro_event_mouse_x(ev)
bouncer_y = al_get_allegro_event_mouse_y(ev)
on ALLEGRO_EVENT_MOUSE_BUTTON_UP
exit
on ALLEGRO_EVENT_KEY_DOWN
switch al_get_allegro_event_keyboard_keycode(ev)
on ALLEGRO_KEY_UP
key[KEY_UP] = true
on ALLEGRO_KEY_DOWN
key[KEY_DOWN] = true
on ALLEGRO_KEY_LEFT
key[KEY_LEFT] = true
on ALLEGRO_KEY_RIGHT
key[KEY_RIGHT] = true
off
on ALLEGRO_EVENT_KEY_UP
switch al_get_allegro_event_keyboard_keycode(ev)
on ALLEGRO_KEY_UP
key[KEY_UP] = false
on ALLEGRO_KEY_DOWN
key[KEY_DOWN] = false
on ALLEGRO_KEY_LEFT
key[KEY_LEFT] = false
on ALLEGRO_KEY_RIGHT
key[KEY_RIGHT] = false
on ALLEGRO_KEY_ESCAPE
exit
off
off
if redraw and al_is_event_queue_empty(event_queue)
redraw = false
al_clear_to_color(al_map_rgb(0,0,0))
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al_draw_bitmap(bouncer, bouncer_x, bouncer_y, 0)
al_flip_display()
ok
callgc()
end
al_destroy_timer(timer)
al_destroy_allegro_event(ev)
al_destroy_allegro_timeout(timeout)
al_destroy_event_queue(event_queue)
al_destroy_bitmap(bouncer)
al_destroy_bitmap(image)
al_destroy_display(display)
Note: In the previous example we used the function callgc() which is a Ring function to force calling the Garbage
collector inside the While/End loop.
Program Output:
At first the program display a messagebox
Then we see two rectangles are moving on the screen
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Then we see an image displayed on the screen
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Finally we have one rectangle, and we see it moving all of the time on the screen but we can control it using the Mouse
and/or the Keyborad
50.1. Drawing, Animation and Input 434