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bounce_parrot_logo.pir
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bounce_parrot_logo.pir
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=head1 TITLE
bounce_parrot_logo.pir - bounce a Parrot logo with the SDL Parrot bindings
=head1 SYNOPSIS
To run this file, run the following command from the Parrot directory:
$ parrot examples/sdl/bounce_parrot_logo.pir
$
You'll see the happy Parrot logo in the middle of a new SDL window. Use the
cursor keys to apply velocity in the appropriate directions. Watch it bounce!
Use the Escape key or close the window when you've had enough.
=cut
.sub _main :main
load_bytecode "SDL/App.pir"
load_bytecode "SDL/Color.pir"
load_bytecode "SDL/Rect.pir"
load_bytecode "SDL/Image.pir"
load_bytecode "SDL/Sprite.pir"
load_bytecode "SDL/EventHandler.pir"
load_bytecode "SDL/Event.pir"
.local pmc app
app = new ['SDL'; 'App']
app.'init'( 'width' => 640, 'height' => 480, 'bpp' => 0, 'flags' => 0 )
.local pmc main_screen
main_screen = app.'surface'()
.local pmc black
black = new ['SDL'; 'Color']
black.'init'( 'r' => 0, 'g' => 0, 'b' => 0 )
.local pmc image
image = new ['SDL'; 'Image']
image.'init'( 'examples/sdl/parrot_small.png' )
.local pmc sprite
sprite = new ['SDL'; 'Sprite']
sprite.'init'( 'surface' => image, 'source_x' => 0, 'source_y' => 0, 'dest_x' => 270, 'dest_y' => 212, 'bgcolor' => black )
_main_loop( main_screen, sprite )
end
.end
.sub _main_loop
.param pmc main_screen
.param pmc sprite
.local pmc parent_class
.local pmc class_type
get_class parent_class, ['SDL'; 'EventHandler']
subclass class_type, parent_class, 'MoveLogo::EventHandler'
.local pmc event_handler
event_handler = new 'MoveLogo::EventHandler'
.local pmc event
event = new ['SDL'; 'Event']
event.'init'()
.local pmc handler_args
handler_args = new 'Hash'
handler_args[ 'screen' ] = main_screen
handler_args[ 'sprite' ] = sprite
.local num last_time
last_time = time
.local num counter
counter = 0
.local num current_time
current_time = 0
.local int frame_count
frame_count = 1
.local int updated
event_handler.'draw_screen'( main_screen, sprite )
loop:
last_time = current_time
updated = event_handler.'update_position'( sprite, frame_count )
if updated == 0 goto increase_count
event_handler.'draw_screen'( main_screen, sprite )
increase_count:
inc frame_count
if frame_count < 6 goto get_event
frame_count = 0
get_event:
event.'handle_event'( event_handler, handler_args )
current_time = time
counter = current_time - last_time
if counter < 0.016 goto get_event
goto loop
.end
.namespace [ 'MoveLogo::EventHandler' ]
.sub update_position :method
.param pmc sprite
.param int frame_count
.local int updated
updated = 0
.local int x_velocity
.local int y_velocity
x_velocity = sprite.'x_velocity'()
y_velocity = sprite.'y_velocity'()
.local int abs_velocity
.local int delta
check_x_update:
if x_velocity == 0 goto check_y_update
abs abs_velocity, x_velocity
set delta, frame_count
sub delta, abs_velocity
if delta > 0 goto check_y_update
updated = 1
if x_velocity < 0 goto neg_x_dir
self.'move_sprite_x'( sprite, 1 )
goto check_y_update
neg_x_dir:
self.'move_sprite_x'( sprite, -1 )
check_y_update:
if y_velocity == 0 goto return
abs abs_velocity, y_velocity
set delta, frame_count
sub delta, abs_velocity
if delta > 0 goto return
updated = 1
if y_velocity < 0 goto neg_y_dir
self.'move_sprite_y'( sprite, 1 )
goto return
neg_y_dir:
self.'move_sprite_y'( sprite, -1 )
return:
.return( updated )
.end
.sub draw_screen :method
.param pmc screen
.param pmc sprite
.local pmc prev_rect
.local pmc rect
.local pmc rect_array
rect_array = new 'ResizablePMCArray'
set rect_array, 2
(prev_rect, rect) = sprite.'draw_undraw'( screen )
set rect_array[ 0 ], prev_rect
set rect_array[ 1 ], rect
screen.'update_rects'( rect_array )
# screen.'update_rect'( rect )
.end
.sub move_sprite_x :method
.param pmc sprite
.param int direction
.local int x
x = sprite.'x'()
add x, direction
if x >= 0 goto check_x_max
x = 0
goto x_bounce
check_x_max:
if x < 540 goto x_update
x = 540
x_bounce:
.local int x_velocity
x_velocity = sprite.'x_velocity'()
x_velocity = -x_velocity
sprite.'x_velocity'( x_velocity )
x_update:
sprite.'x'( x )
.end
.sub move_sprite_y :method
.param pmc sprite
.param int direction
.local int y
y = sprite.'y'()
add y, direction
if y >= 0 goto check_y_max
y = 0
goto y_bounce
check_y_max:
if y < 424 goto y_update
y = 424
y_bounce:
.local int y_velocity
y_velocity = sprite.'y_velocity'()
y_velocity = -y_velocity
sprite.'y_velocity'( y_velocity )
y_update:
sprite.'y'( y )
.end
.sub key_down_down :method
.param pmc event_args
.local pmc screen
.local pmc sprite
screen = event_args[ 'screen' ]
sprite = event_args[ 'sprite' ]
.local int y_vel
y_vel = sprite.'y_velocity'()
if y_vel == 5 goto return
inc y_vel
sprite.'y_velocity'( y_vel )
return:
.end
.sub key_down_up :method
.param pmc event_args
.local pmc screen
.local pmc sprite
screen = event_args[ 'screen' ]
sprite = event_args[ 'sprite' ]
.local int y_vel
y_vel = sprite.'y_velocity'()
if y_vel == -5 goto return
dec y_vel
sprite.'y_velocity'( y_vel )
return:
.end
.sub key_down_left :method
.param pmc event_args
.local pmc screen
.local pmc sprite
screen = event_args[ 'screen' ]
sprite = event_args[ 'sprite' ]
.local int x_vel
x_vel = sprite.'x_velocity'()
if x_vel == -5 goto return
dec x_vel
sprite.'x_velocity'( x_vel )
return:
.end
.sub key_down_right :method
.param pmc event_args
.local pmc screen
.local pmc sprite
screen = event_args[ 'screen' ]
sprite = event_args[ 'sprite' ]
.local int x_vel
x_vel = sprite.'x_velocity'()
if x_vel == 5 goto return
inc x_vel
sprite.'x_velocity'( x_vel )
return:
.end
.sub key_down_escape :method
.param pmc event_args
# XXX: a silly way to quit
end
.end
=head1 AUTHOR
chromatic, E<lt>chromatic at wgz dot orgE<gt>.
=head1 COPYRIGHT
Copyright (C) 2004-2008, Parrot Foundation.
=cut
# Local Variables:
# mode: pir
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4 ft=pir: