Class: DXRubySDL::Window::FPSTimer

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/dxruby_sdl/window/fpstimer.rb

Overview

FPSTimer is copied from www.kmc.gr.jp/~ohai/fpstimer.rb.

Constant Summary collapse

FPS_COUNT = 
10

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(fps = 60, accurary = 10, skip_limit = 15) ⇒ FPSTimer

fps is the number of frames per second that you want to keep, accurary is the accurary of sleep/SDL.delay in milisecond



18
19
20
21
22
 
# File 'lib/dxruby_sdl/window/fpstimer.rb', line 18

def initialize(fps = 60, accurary = 10, skip_limit = 15)
  @fps = fps
  @accurary = accurary / 1000.0
  @skip_limit = skip_limit
end

Instance Attribute Details

#count_sleep ⇒ Object (readonly)

Returns the value of attribute count_sleep.



15
16
17
 
# File 'lib/dxruby_sdl/window/fpstimer.rb', line 15

def count_sleep
  @count_sleep
end

#fps ⇒ Object

Returns the value of attribute fps.



13
14
15
 
# File 'lib/dxruby_sdl/window/fpstimer.rb', line 13

def fps
  @fps
end

#real_fps ⇒ Object (readonly)

Returns the value of attribute real_fps.



14
15
16
 
# File 'lib/dxruby_sdl/window/fpstimer.rb', line 14

def real_fps
  @real_fps
end

#total_skip ⇒ Object (readonly)

Returns the value of attribute total_skip.



14
15
16
 
# File 'lib/dxruby_sdl/window/fpstimer.rb', line 14

def total_skip
  @total_skip
end

Instance Method Details

#reset ⇒ Object

reset timer, you should call just before starting loop



25
26
27
28
29
30
31
32
33
 
# File 'lib/dxruby_sdl/window/fpstimer.rb', line 25

def reset
  @old = get_ticks
  @skip = 0
  @real_fps = @fps
  @frame_count = 0
  @fps_old = @old
  @count_sleep = 0
  @total_skip = 0
end

#wait_frame ⇒ Object

execute given block and wait



36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
 
# File 'lib/dxruby_sdl/window/fpstimer.rb', line 36

def wait_frame
  now = get_ticks
  nxt = @old + (1.0 / @fps)
  if nxt > now
    yield
    @skip = 0
    wait(nxt)
    @old = nxt
  elsif @skip > @skip_limit
    # :nocov:
    yield
    @skip = 0
    @old = get_ticks
    # :nocov:
  else
    # :nocov:
    @skip += 1
    @total_skip += 1
    @old = nxt
    # :nocov:
  end

  calc_real_fps
end