Sprite Rotation

no-reply@allegro.cc (horizon981) — Sat, 12 Aug 2006 19:59:42 +0000

This simple program was meant to draw rotating sprites. However, I don't see any rotation. What's wrong?

1/*Operations on sprites*/
2#include 
3 
4int main()
5{
allegro_init();
install_keyboard();
set_color_depth(desktop_color_depth());
set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);

BITMAP* sprite = load_bitmap("attack_p_0.bmp",NULL);

while(!key[KEY_ESC])
{
for(int i=0; i<255; i++)
{                 
 rotate_sprite(screen, sprite, 0, 0, 200);
}
}

destroy_bitmap(sprite);
allegro_exit();
return 0;
24}
25END_OF_MAIN()

no-reply@allegro.cc (Bernardo Lopes) — Sat, 12 Aug 2006 20:11:39 +0000

Because the 'angle' parameter of the function rotate_sprite is a fixed type. And you're passing an integer.

You should convert the integer with itofix, thus:

rotate_sprite(screen, sprite, 0, 0, itofix(200));

no-reply@allegro.cc (horizon981) — Sat, 12 Aug 2006 20:22:05 +0000

Thanks.:D

1	/Operations on sprites/
2	#include
3
4	int main()
5	{
6	allegro_init();
7	install_keyboard();
8	set_color_depth(desktop_color_depth());
9	set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);
10
11	BITMAP* sprite = load_bitmap("attack_p_0.bmp",NULL);
12
13	while(!key[KEY_ESC])
14	{
15	for(int i=0; i<255; i++)
16	{
17	rotate_sprite(screen, sprite, 0, 0, 200);
18	}
19	}
20
21	destroy_bitmap(sprite);
22	allegro_exit();
23	return 0;
24	}
25	END_OF_MAIN()