SDL::Joystick(3pm)

1SDL::Joystick(3)      User Contributed Perl Documentation     SDL::Joystick(3)
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NAME

6       SDL::Joystick -- SDL Bindings for the Joystick device
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SYNOPSIS

12        use SDL;
13        use SDL::Joystick;
14
15        SDL::init_sub_system(SDL_INIT_JOYSTICK);
16
17        die('no joystick found') unless(SDL::Joystick::num_joysticks());
18
19        my $joystick = SDL::Joystick->new(0);
20

METHODS

22   num_joysticks
23        int SDL::Joystick::num_joysticks( void );
24
25       Counts and returns available joysticks.
26
27   name
28        string SDL::Joystick::name( index );
29
30       Get the implementation dependent name of joystick. The "index"
31       parameter refers to the N'th joystick on the system.
32
33        my $num_joysticks = SDL::Joystick::num_joysticks();
34
35        printf("%d joysticks found\n", $num_joysticks);
36
37        for($i = 0; $i < $num_joysticks; $i++)
38        {
39            printf("%s\n", SDL::Joystick::name($i));
40        }
41
42   new
43        object SDL::Joystick->new( index );
44
45       Opens a joystick for use within SDL. The "index" refers to the N'th
46       joystick in the system.  A joystick must be opened before it can be
47       used.
48
49        # Initialize the joystick subsystem
50        SDL::init_sub_system(SDL_INIT_JOYSTICK);
51
52        # Check for joystick
53        if(SDL::Joystick::num_joysticks() > 0)
54        {
55            # Open joystick
56            my $joystick = SDL::Joystick->new(0);
57
58            if($joystick)
59            {
60                printf("Opened Joystick 0\n");
61                printf("Name: %s\n",              SDL::Joystick::name(0));
62                printf("Number of Axes: %d\n",    SDL::Joystick::num_axes($joystick));
63                printf("Number of Buttons: %d\n", SDL::Joystick::num_buttons($joystick));
64                printf("Number of Balls: %d\n",   SDL::Joystick::num_balls($joystick));
65            }
66            else
67            {
68                printf("Couldn't open Joystick 0\n");
69            }
70
71            # Close if opened
72            SDL::Joystick::close($joystick) if SDL::Joystick::opened(0);
73        }
74
75   opened
76        int SDL::Joystick::opened( index );
77
78       Determines whether a joystick has already been opened within the
79       application. "index" refers to the N'th joystick on the system.
80
81       Returns 1 if the joystick has been opened, or 0 if it has not.
82
83   index
84        int SDL::Joystick::index( object );
85
86       Returns the "index" of a given "SDL_Joystick" structure. See
87       SDL::Joystick::new
88
89   num_axes
90        int SDL::Joystick::num_axes( object );
91
92       Return the number of axes available from a previously opened joystick.
93       See SDL::Joystick::new
94
95   num_balls
96        int SDL::Joystick::num_balls( object );
97
98       Return the number of trackballs available from a previously opened
99       joystick. See SDL::Joystick::new
100
101   num_hats
102        int SDL::Joystick::num_hats( object );
103
104       Gets the number of joystick hats from a previously opened joystick. See
105       SDL::Joystick::new
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107   num_buttons
108        int SDL::Joystick::num_buttons( object );
109
110       Gets the number of joystick buttons from a previously opened joystick.
111       See SDL::Joystick::new
112
113   update
114        void SDL::Joystick::update();
115
116       Updates the state(position, buttons, etc.) of all open joysticks. If
117       joystick events have been enabled with "SDL::Joystick::event_state"
118       then this is called automatically in the event loop.
119
120   get_axis
121       "get_axis" returns the current state of the given axis on the given
122       joystick.
123
124       On most modern joysticks the X axis is usually represented by axis 0
125       and the Y axis by axis 1.  The value returned by "get_axis" is a signed
126       integer (-32768 to 32767) representing the current position of the
127       axis, it may be necessary to impose certain tolerances on these values
128       to account for jitter.
129
130       Note: Some joysticks use axes 2 and 3 for extra buttons.
131
132       Returns a 16-bit signed integer representing the current position of
133       the axis.
134
135        my $joystick = SDL::Joystick->new(0);
136
137        my $x_move   = SDL::Joystick::get_axis($joystick, 0);
138        my $y_move   = SDL::Joystick::get_axis($joystick, 1);
139
140   get_hat
141        int SDL::Joystick::get_hat( object, int );
142
143       "get_hat" returns the current state of the given "hat" on the given
144       "joystick".
145
146       The current state is returned which is an OR'd combination of one or
147       more of the following:
148
149       ·   "SDL_HAT_CENTERED"
150
151       ·   "SDL_HAT_UP"
152
153       ·   "SDL_HAT_RIGHT"
154
155       ·   "SDL_HAT_DOWN"
156
157       ·   "SDL_HAT_LEFT"
158
159       ·   "SDL_HAT_RIGHTUP"
160
161       ·   "SDL_HAT_RIGHTDOWN"
162
163       ·   "SDL_HAT_LEFTUP"
164
165       ·   "SDL_HAT_LEFTDOWN"
166
167        my $joystick = SDL::Joystick->new(0);
168
169        my $position = SDL::Joystick::get_hat($joystick, 0);
170
171        print("hat is in position UP\n") if $position & SDL_HAT_UP;
172
173   get_button
174        int SDL::Joystick::get_button( object, int );
175
176       "get_button" returns the current state of the given button on the given
177       joystick.
178
179       Returns 1 if the button is pressed. Otherwise, 0.
180
181        my $joystick    = SDL::Joystick->new(0);
182
183        my $num_buttons = SDL::Joystick::num_buttons($joystick);
184
185        for(my $i = 0; $i < $num_buttons; $i++)
186        {
187            printf("button %d is %s\n", $i, SDL::Joystick::get_button($joystick, $i) ? 'pressed' : 'not pressed');
188        }
189
190        SDL::Joystick::close($joystick) if SDL::Joystick::opened(0);
191
192   get_ball
193        int SDL::Joystick::get_ball(SDL_Joystick $joystick, int $ball, int $dx, int $dy);
194
195       Get the ball axis change.
196
197       Trackballs can only return relative motion since the last call to
198       SDL::Joystick::get_ball, these motion deltas are placed into "dx" and
199       "dy".
200
201       Returns 0 on success or -1 on failure
202
203        my $delta_x  = 0;
204        my $delta_y  = 0;
205        my $joystick = SDL::Joystick->new(0);
206
207        SDL::Joystick::update();
208
209        printf("TrackBall Read Error!\n") if(SDL::JoystickGetBall($joystick, 0, $delta_x, $delta_y) == -1);
210        printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y);
211
212   close
213        void SDL::Joystick::close( object );
214
215       Closes a previously opened joystick. See SDL::Joystick::new
216
217        SDL::Joystick::close($joystick) if SDL::Joystick::opened(0);
218

AUTHORS

220       See "AUTHORS" in SDL.
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224perl v5.30.1                      2020-01-30                  SDL::Joystick(3)

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AUTHORS