1#include <allegro5/allegro.h>
2#include <allegro5/allegro_primitives.h>
3#include <cstdlib>
4#include <iostream>
5#include <stdio.h>
6
7
8class Mouse
9{
10public:
11 bool dragging
;
12 int drag_start_x
;
13 int drag_start_y
;
14 int drag_offset_x
;
15 int drag_offset_y
;
16
17 int x
;
18 int y
;
19
20 Mouse
():dragging
(false), drag_start_x
(0), drag_start_y
(0) {}
21
22 void start_drag
(int x,
int y
)
23 {
24 drag_start_x
= x
;
25 drag_start_y
= y
;
26 this->x
= x
;
27 this->y
= y
;
28 dragging
= true;
29 std::cout
<< "starting drag \n";
30 }
31
32 void end_drag
()
33 {
34 dragging
= false;
35 drag_start_x
= 0;
36 drag_start_y
= 0;
37 std::cout
<< "ending drag \n";
38 }
39};
40
41
42int main
(int argc,
char *argv
[])
43{
44 ALLEGRO_DISPLAY *display
= NULL
;
45 ALLEGRO_EVENT_QUEUE *event_queue
= NULL
;
46 ALLEGRO_TIMER *timer
= NULL
;
47
48 bool done
= false;
49
50 if(!al_init()) {
51 printf("failed to initialize allegro!\n");
52 return -1;
53 }
54
55 al_set_new_display_flags(ALLEGRO_NOFRAME
);
56
57 display
= al_create_display(320,
240);
58 if(!display
) {
59 printf("failed to create display!\n");
60 al_destroy_timer(timer
);
61 return -1;
62 }
63
64 timer
= al_create_timer(1.
0 / 60);
65 if(!timer
) {
66 printf("failed to create timer!\n");
67 return -1;
68 }
69
70 al_set_target_bitmap(al_get_backbuffer(display
));
71
72 if(!al_install_mouse()) {
73 fprintf(stderr,
"failed to initialize the mouse!\n");
74 return -1;
75 }
76
77 event_queue
= al_create_event_queue();
78 if(!event_queue
) {
79 fprintf(stderr,
"failed to create event_queue!\n");
80 al_destroy_display(display
);
81 al_destroy_timer(timer
);
82 return -1;
83 }
84
85 al_register_event_source(event_queue,
al_get_display_event_source(display
));
86 al_register_event_source(event_queue,
al_get_mouse_event_source());
87 al_register_event_source(event_queue,
al_get_timer_event_source(timer
));
88 al_clear_to_color(al_map_rgb(0,
0,
0));
89 al_flip_display();
90 al_start_timer(timer
);
91
92 Mouse mouse
;
93
94 while(!done
)
95 {
96 ALLEGRO_EVENT al_event
;
97 al_wait_for_event(event_queue,
&al_event
);
98
99 switch(al_event.type
)
100 {
101 case ALLEGRO_EVENT_MOUSE_AXES:
102 if (mouse.dragging
)
103 {
104 int x, y
;
105 al_get_window_position(display,
&x,
&y
);
106 al_set_window_position(display, x
+al_event.mouse.dx, y
+al_event.mouse.dy
);
107 al_set_mouse_xy(display, al_event.mouse.x
- al_event.mouse.dx, al_event.mouse.y
- al_event.mouse.dy
);
108 mouse.x
= al_event.mouse.x
- al_event.mouse.dx
;
109 mouse.y
= al_event.mouse.y
- al_event.mouse.dy
;
110 }
111 break;
112 case ALLEGRO_EVENT_MOUSE_BUTTON_DOWN:
113 mouse.start_drag
(al_event.mouse.x, al_event.mouse.y
);
114 break;
115 case ALLEGRO_EVENT_MOUSE_BUTTON_UP:
116 mouse.end_drag
();
117 break;
118 case ALLEGRO_EVENT_KEY_DOWN:
119 done
= true;
120 break;
121 case ALLEGRO_EVENT_TIMER:
122 al_clear_to_color(al_map_rgb(0,
0,
0));
123 al_flip_display();
124 break;
125 default:
126 break;
127 }
128 }
129
130
131 return 0;
132}
..Thanks mate!