1#include <stdio.h>
2#include <allegro5/allegro.h>
3
4const float FPS
= 60;
5const int SCREEN_W = 640;
6const int SCREEN_H = 480;
7const int BOUNCER_SIZE
= 32;
8
9int main
(int argc,
char **argv
)
10{
11 ALLEGRO_DISPLAY *display
= NULL
;
12 ALLEGRO_EVENT_QUEUE *event_queue
= NULL
;
13 ALLEGRO_TIMER *timer
= NULL
;
14 ALLEGRO_BITMAP *bouncer
= NULL
;
15 float bouncer_x
= SCREEN_W / 2.
0 - BOUNCER_SIZE
/ 2.
0;
16 float bouncer_y
= SCREEN_H / 2.
0 - BOUNCER_SIZE
/ 2.
0;
17 bool redraw
= true;
18
19 if(!al_init()) {
20 fprintf(stderr,
"failed to initialize allegro!\n");
21 return -1;
22 }
23
24 if(!al_install_mouse()) {
25 fprintf(stderr,
"failed to initialize the mouse!\n");
26 return -1;
27 }
28
29 timer
= al_create_timer(1.
0 / FPS
);
30 if(!timer
) {
31 fprintf(stderr,
"failed to create timer!\n");
32 return -1;
33 }
34
35 display
= al_create_display(SCREEN_W,
SCREEN_H);
36 if(!display
) {
37 fprintf(stderr,
"failed to create display!\n");
38 al_destroy_timer(timer
);
39 return -1;
40 }
41
42 bouncer
= al_create_bitmap(BOUNCER_SIZE, BOUNCER_SIZE
);
43 if(!bouncer
) {
44 fprintf(stderr,
"failed to create bouncer bitmap!\n");
45 al_destroy_display(display
);
46 al_destroy_timer(timer
);
47 return -1;
48 }
49
50 al_set_target_bitmap(bouncer
);
51
52 al_clear_to_color(al_map_rgb(255,
0,
255));
53
54 al_set_target_bitmap(al_get_backbuffer(display
));
55
56 event_queue
= al_create_event_queue();
57 if(!event_queue
) {
58 fprintf(stderr,
"failed to create event_queue!\n");
59 al_destroy_bitmap(bouncer
);
60 al_destroy_display(display
);
61 al_destroy_timer(timer
);
62 return -1;
63 }
64
65 al_register_event_source(event_queue,
al_get_display_event_source(display
));
66
67 al_register_event_source(event_queue,
al_get_timer_event_source(timer
));
68
69 al_register_event_source(event_queue,
al_get_mouse_event_source());
70
71 al_clear_to_color(al_map_rgb(0,
0,
0));
72
73 al_flip_display();
74
75 al_start_timer(timer
);
76
77 while(1)
78 {
79 ALLEGRO_EVENT ev
;
80 al_wait_for_event(event_queue,
&ev
);
81
82 if(ev.type
== ALLEGRO_EVENT_TIMER
) {
83 redraw
= true;
84 }
85 else if(ev.type
== ALLEGRO_EVENT_DISPLAY_CLOSE
) {
86 break;
87 }
88 else if(ev.type
== ALLEGRO_EVENT_MOUSE_AXES
||
89 ev.type
== ALLEGRO_EVENT_MOUSE_ENTER_DISPLAY
) {
90
91 bouncer_x
= ev.mouse.x
;
92 bouncer_y
= ev.mouse.y
;
93 }
94 else if(ev.type
== ALLEGRO_EVENT_MOUSE_BUTTON_UP
) {
95 break;
96 }
97
98 if(redraw
&& al_is_event_queue_empty(event_queue
)) {
99 redraw
= false;
100
101 al_clear_to_color(al_map_rgb(0,
0,
0));
102
103 al_draw_bitmap(bouncer, bouncer_x, bouncer_y,
0);
104
105 al_flip_display();
106 }
107 }
108
109 al_destroy_bitmap(bouncer
);
110 al_destroy_timer(timer
);
111 al_destroy_display(display
);
112 al_destroy_event_queue(event_queue
);
113
114 return 0;
115}