Gosu Basics - Developing Games With Ruby - page 13

private 40

41
42 def current_frame
43 @animation [ @current_frame % @animation . size ]
44 end
45
46 def frame_expired?
47 now = Gosu . milliseconds
48 @last_frame ||= now
49 if (now - @last_frame ) > FRAME_DELAY
50 @last_frame = now
51 end
52 end
53 end
54
55 class GameWindow < Gosu :: Window
56

BACKGROUND = media_path( 'country_field.png' )

57
58 def initialize (width =800 , height =600 , fullscreen = false )
59 super
60 self . caption = 'Hello Animation'
61 @background = Gosu :: Image . new(
62 self , BACKGROUND , false )
63 @animation = Explosion . load_animation( self )
64 @explosions = []
65 end
66
67 def update
68 @explosions . reject!( & :done? )
69 @explosions . map( & :update )
70 end
71
72 def button_down ( id )
73 close if id == Gosu :: KbEscape
74 if id == Gosu :: MsLeft
75 @explosions . push(

Explosion . new(

76

@animation , mouse_x, mouse_y)) 77

78 end
79 end
80
81 def needs_cursor?
82 true
83 end
84
85 def needs_redraw?