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#!/usr/bin/env python
from __future__ import division
import sys, os
from random import *
from math import *
from ctypes import *
# Get path to examples data.
p = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "examples"))
from allegro import *
def abort_example(text):
sys.stderr.write(text)
sys.exit(1)
FPS = 60
MAX_SPRITES = 1024
class Sprite:
def __init__(self):
self.x, self.y, self.dx, self.dy = 0, 0, 0, 0
text = [
"Space - toggle use of textures",
"B - toggle alpha blending",
"Left/Right - change bitmap size",
"Up/Down - change bitmap count",
"F1 - toggle help text"
]
class Example:
sprites = [Sprite() for i in range(MAX_SPRITES)]
use_memory_bitmaps = False
blending = False
display = None
mysha = None
bitmap = None
bitmap_size = 0
sprite_count = 0
show_help = True
font = None
mouse_down = False
last_x, last_y = 0, 0
white = None
half_white = None
dark = None
red = None
direct_speed_measure = 1.0
ftpos = 0
frame_times = [0.0] * FPS
example = Example()
def add_time():
example.frame_times[example.ftpos] = al_get_time()
example.ftpos += 1
if example.ftpos >= FPS:
example.ftpos = 0
def get_fps():
prev = FPS - 1
min_dt = 1
max_dt = 1 / 1000000
av = 0
for i in range(FPS):
if i != example.ftpos:
dt = example.frame_times[i] - example.frame_times[prev]
if dt < min_dt and dt > 0:
min_dt = dt
if dt > max_dt:
max_dt = dt
av += dt
prev = i
av /= FPS - 1
average = ceil(1 / av)
d = 1 / min_dt - 1 / max_dt
minmax = floor(d / 2)
return average, minmax
def add_sprite():
if example.sprite_count < MAX_SPRITES:
w = al_get_display_width(example.display)
h = al_get_display_height(example.display)
i = example.sprite_count
example.sprite_count += 1
s = example.sprites[i]
a = randint(0, 359)
s.x = randint(0, w - example.bitmap_size - 1)
s.y = randint(0, h - example.bitmap_size - 1)
s.dx = cos(a) * FPS * 2
s.dy = sin(a) * FPS * 2
def add_sprites(n):
for i in range(n):
add_sprite()
def remove_sprites(n):
example.sprite_count -= n
if example.sprite_count < 0:
example.sprite_count = 0
def change_size(size):
if size < 1:
size = 1
if size > 1024:
size = 1024
if example.bitmap:
al_destroy_bitmap(example.bitmap)
al_set_new_bitmap_flags(
ALLEGRO_MEMORY_BITMAP if example.use_memory_bitmaps else 0)
example.bitmap = al_create_bitmap(size, size)
example.bitmap_size = size
al_set_target_bitmap(example.bitmap)
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_ZERO, example.white)
al_clear_to_color(al_map_rgba_f(0, 0, 0, 0))
bw = al_get_bitmap_width(example.mysha)
bh = al_get_bitmap_height(example.mysha)
al_draw_scaled_bitmap(example.mysha, 0, 0, bw, bh, 0, 0,
size, size, 0)
al_set_target_backbuffer(example.display)
def sprite_update(s):
w = al_get_display_width(example.display)
h = al_get_display_height(example.display)
s.x += s.dx / FPS
s.y += s.dy / FPS
if s.x < 0:
s.x = -s.x
s.dx = -s.dx
if s.x + example.bitmap_size > w:
s.x = -s.x + 2 * (w - example.bitmap_size)
s.dx = -s.dx
if s.y < 0:
s.y = -s.y
s.dy = -s.dy
if s.y + example.bitmap_size > h:
s.y = -s.y + 2 * (h - example.bitmap_size)
s.dy = -s.dy
if example.bitmap_size > w: s.x = w / 2 - example.bitmap_size / 2
if example.bitmap_size > h: s.y = h / 2 - example.bitmap_size / 2
def update():
for i in range(example.sprite_count):
sprite_update(example.sprites[i])
def redraw():
w = al_get_display_width(example.display)
h = al_get_display_height(example.display)
fh = al_get_font_line_height(example.font)
info = ["textures", "memory buffers"]
binfo = ["alpha", "additive", "tinted", "solid"]
tint = example.white
if example.blending == 0:
al_set_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA)
tint = example.half_white
elif example.blending == 1:
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_ONE)
tint = example.dark
elif example.blending == 2:
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_ZERO)
tint = example.red
elif example.blending == 3:
al_set_blender(ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_ZERO, example.white)
for i in range(example.sprite_count):
s = example.sprites[i]
al_draw_tinted_bitmap(example.bitmap, tint, s.x, s.y, 0)
al_set_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA)
if example.show_help:
for i in range(5):
al_draw_text(example.font, example.white, 0, h - 5 * fh + i * fh, 0, text[i])
al_draw_textf(example.font, example.white, 0, 0, 0, "count: %d",
example.sprite_count)
al_draw_textf(example.font, example.white, 0, fh, 0, "size: %d",
example.bitmap_size)
al_draw_textf(example.font, example.white, 0, fh * 2, 0, "%s",
info[example.use_memory_bitmaps].encode("utf8"))
al_draw_textf(example.font, example.white, 0, fh * 3, 0, "%s",
binfo[example.blending].encode("utf8"))
f1, f2 = get_fps()
al_draw_textf(example.font, example.white, w, 0, ALLEGRO_ALIGN_RIGHT, "%s",
("FPS: %4d +- %-4d" % (f1, f2)).encode("utf8"))
al_draw_textf(example.font, example.white, w, fh, ALLEGRO_ALIGN_RIGHT, "%s",
("%4d / sec" % int(1.0 / example.direct_speed_measure)).encode("utf8"))
def main():
w, h = 640, 480
done = False
need_redraw = True
example.show_help = True
if not al_install_system(ALLEGRO_VERSION_INT, None):
abort_example("Failed to init Allegro.\n")
sys.exit(1)
if not al_init_image_addon():
abort_example("Failed to init IIO addon.\n")
sys.exit(1)
al_init_font_addon()
al_get_num_video_adapters()
info = ALLEGRO_MONITOR_INFO()
al_get_monitor_info(0, byref(info))
if info.x2 - info.x1 < w:
w = info.x2 - info.x1
if info.y2 - info.y1 < h:
h = info.y2 - info.y1
example.display = al_create_display(w, h)
if not example.display:
abort_example("Error creating display.\n")
if not al_install_keyboard():
abort_example("Error installing keyboard.\n")
if not al_install_mouse():
abort_example("Error installing mouse.\n")
example.font = al_load_font(p + "/data/fixed_font.tga", 0, 0)
if not example.font:
abort_example("Error loading data/fixed_font.tga\n")
example.mysha = al_load_bitmap(p + "/data/mysha256x256.png")
if not example.mysha:
abort_example("Error loading data/mysha256x256.png\n")
example.white = al_map_rgb_f(1, 1, 1)
example.half_white = al_map_rgba_f(1, 1, 1, 0.5)
example.dark = al_map_rgb(15, 15, 15)
example.red = al_map_rgb_f(1, 0.2, 0.1)
change_size(256)
add_sprite()
add_sprite()
timer = al_create_timer(1.0 / FPS)
queue = al_create_event_queue()
al_register_event_source(queue, al_get_keyboard_event_source())
al_register_event_source(queue, al_get_mouse_event_source())
al_register_event_source(queue, al_get_timer_event_source(timer))
al_register_event_source(queue, al_get_display_event_source(example.display))
al_start_timer(timer)
while not done:
event = ALLEGRO_EVENT()
if need_redraw and al_is_event_queue_empty(queue):
t = -al_get_time()
add_time()
al_clear_to_color(al_map_rgb_f(0, 0, 0))
redraw()
t += al_get_time()
example.direct_speed_measure = t
al_flip_display()
need_redraw = False
al_wait_for_event(queue, byref(event))
if event.type == ALLEGRO_EVENT_KEY_CHAR:
if event.keyboard.keycode == ALLEGRO_KEY_ESCAPE:
done = True
elif event.keyboard.keycode == ALLEGRO_KEY_UP:
add_sprites(1)
elif event.keyboard.keycode == ALLEGRO_KEY_DOWN:
remove_sprites(1)
elif event.keyboard.keycode == ALLEGRO_KEY_LEFT:
change_size(example.bitmap_size - 1)
elif event.keyboard.keycode == ALLEGRO_KEY_RIGHT:
change_size(example.bitmap_size + 1)
elif event.keyboard.keycode == ALLEGRO_KEY_F1:
example.show_help ^= 1
elif event.keyboard.keycode == ALLEGRO_KEY_SPACE:
example.use_memory_bitmaps ^= 1
change_size(example.bitmap_size)
elif event.keyboard.keycode == ALLEGRO_KEY_B:
example.blending += 1
if example.blending == 4:
example.blending = 0
elif event.type == ALLEGRO_EVENT_DISPLAY_CLOSE:
done = True
elif event.type == ALLEGRO_EVENT_TIMER:
update()
need_redraw = True
elif event.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN:
example.mouse_down = True
example.last_x = event.mouse.x
example.last_y = event.mouse.y
elif event.type == ALLEGRO_EVENT_MOUSE_BUTTON_UP:
fh = al_get_font_line_height(example.font)
example.mouse_down = False
if event.mouse.x < 40 and event.mouse.y >= h - fh * 5:
button = (event.mouse.y - (h - fh * 5)) // fh
if button == 0:
example.use_memory_bitmaps ^= 1
change_size(example.bitmap_size)
if button == 1:
example.blending += 1
if example.blending == 4:
example.blending = 0
if button == 4:
example.show_help ^= 1
elif event.type == ALLEGRO_EVENT_MOUSE_AXES:
if example.mouse_down:
dx = event.mouse.x - example.last_x
dy = event.mouse.y - example.last_y
if dy > 4:
add_sprites(int(dy / 4))
if dy < -4:
remove_sprites(-int(dy / 4))
if dx > 4:
change_size(example.bitmap_size + dx - 4)
if dx < -4:
change_size(example.bitmap_size + dx + 4)
example.last_x = event.mouse.x
example.last_y = event.mouse.y
al_destroy_bitmap(example.bitmap)
al_uninstall_system()
al_main(main)
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