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| "Endless" mouse |
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roger levy
Member #2,513
July 2002
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Is it possible to have an "endless" mouse, that isn't constrained to the boundaries of the display? Maybe by warping it every frame? |
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torhu
Member #2,727
September 2002
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Do you mean just having the pointer appear at the opposite side of the screen of where it exits? I suppose you could just call set_mouse_xy. |
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roger levy
Member #2,513
July 2002
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No, I mean, like hiding the cursor, and using the actual movement of the physical mouse which isn't constrained by the display. As you would in an fps. |
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torhu
Member #2,727
September 2002
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Right. Not sure about that |
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Izual
Member #2,756
September 2002
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You can try to emulate it with something like the code below. Its propably not perfect but it works. Use the dx and dy to determine the mouse movements. ( press G to hide / show the mouse cursor ) 1#include <stdbool.h>
2#include <stdio.h>
3
4#include "allegro5/allegro.h"
5
6enum
7 {
8 DISPLAY_W = 1280,
9 DISPLAY_H = 960
10 };
11
12ALLEGRO_DISPLAY *display;
13ALLEGRO_EVENT_QUEUE *event_queue;
14ALLEGRO_EVENT event;
15
16bool repeat;
17bool mouse_hiden;
18
19int main()
20 {
21 al_init();
22 al_install_mouse();
23 al_install_keyboard();
24
25 display = al_create_display( DISPLAY_W, DISPLAY_H );
26 event_queue = al_create_event_queue();
27
28 al_register_event_source( event_queue, al_get_keyboard_event_source() );
29 al_register_event_source( event_queue, al_get_mouse_event_source() );
30
31 mouse_hiden = false;
32 repeat = true;
33
34 while( repeat )
35 {
36 al_wait_for_event( event_queue, &event );
37
38 switch( event.type )
39 {
40 case ALLEGRO_EVENT_MOUSE_AXES:
41 printf( "MOUSE: x=%d, y=%d, z=%d, dx=%d, dy=%d, dz=%d\n",
42 event.mouse.x,
43 event.mouse.y,
44 event.mouse.z,
45 event.mouse.dx,
46 event.mouse.dy,
47 event.mouse.dz );
48
49 if( mouse_hiden )
50 al_set_mouse_xy( display, DISPLAY_W / 2, DISPLAY_H / 2 );
51 break;
52
53 case ALLEGRO_EVENT_KEY_DOWN:
54 if( event.keyboard.keycode == ALLEGRO_KEY_ESCAPE )
55 repeat = false;
56
57 if( event.keyboard.keycode == ALLEGRO_KEY_G )
58 {
59 if( mouse_hiden )
60 {
61 mouse_hiden = false;
62 al_show_mouse_cursor( display );
63 al_ungrab_mouse();
64 }
65 else
66 {
67 mouse_hiden = true;
68 al_grab_mouse( display );
69 al_hide_mouse_cursor( display );
70 al_set_mouse_xy( display, DISPLAY_W / 2, DISPLAY_H / 2 );
71 }
72 }
73 break;
74
75 default:
76 printf( "Unhandled event type %d!\n", event.type );
77 break;
78 }
79 }
80
81 return 0;
82 }
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bamccaig
Member #7,536
July 2006
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Yep, pretty sure FPS's just record the mouse movement and then reset its position to the centre of the screen every frame or thereabouts. Izual's sample code appears to be doing just that. -- acc.js | al4anim - Allegro 4 Animation library | Allegro 5 VS/NuGet Guide | Allegro.cc Mockup | Allegro.cc <code> Tag | Allegro 4 Timer Example (w/ Semaphores) | Allegro 5 "Winpkg" (MSVC readme) | Bambot | Blog | C++ STL Container Flowchart | Castopulence Software | Check Return Values | Derail? | Is This A Discussion? Flow Chart | Filesystem Hierarchy Standard | Clean Code Talks - Global State and Singletons | How To Use Header Files | GNU/Linux (Debian, Fedora, Gentoo) | rot (rot13, rot47, rotN) | Streaming |
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Elias
Member #358
May 2000
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ex_mouse_warp that ships with Allegro also does the same: https://github.com/liballeg/allegro5/blob/master/examples/ex_mouse_warp.c -- |
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