load_joystick_data(3alleg4) Allegro manual load_joystick_data(3alleg4)NAME
load_joystick_data - Loads joystick calibration data. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int load_joystick_data(const char *filename);
DESCRIPTION
Restores calibration data previously stored by save_joystick_data() or the setup utility. This sets up all aspects of the joystick code:
you don't even need to call install_joystick() if you are using this function. Pass a NULL filename to read the data from the currently
selected configuration file.
RETURN VALUE
Returns zero on success: if it fails the joystick state is undefined and you must reinitialise it from scratch.
SEE ALSO install_joystick(3alleg4), save_joystick_data(3alleg4), set_config_file(3alleg4)Allegro version 4.4.2 load_joystick_data(3alleg4)
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install_joystick(3alleg4) Allegro manual install_joystick(3alleg4)NAME
install_joystick - Initialises the joystick. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int install_joystick(int type);
DESCRIPTION
Installs Allegro's joystick handler, and calibrates the centre position values. The type parameter should usually be JOY_TYPE_AUTODETECT,
or see the platform specific documentation for a list of the available drivers. You must call this routine before using any other joystick
functions, and you should make sure that all joysticks are in the middle position at the time. Example:
textout_centre_ex(screen, font,
"Center the joystick and press a key",
SCREEN_W/2, SCREEN_H/2, red_color, -1);
readkey();
if (install_joystick(JOY_TYPE_AUTODETECT) != 0)
abort_on_error("Error initialising joystick!");
RETURN VALUE
Returns zero on success. As soon as you have installed the joystick module, you will be able to read the button state and digital (on/off
toggle) direction information, which may be enough for some games. If you want to get full analogue input, though, you need to use the cal-
ibrate_joystick() functions to measure the exact range of the inputs: see below.
SEE ALSO remove_joystick(3alleg4), num_joysticks(3alleg4), load_joystick_data(3alleg4), calibrate_joystick(3alleg4), calibrate_joy-
stick_name(3alleg4), poll_joystick(3alleg4), exjoy(3alleg4)Allegro version 4.4.2 install_joystick(3alleg4)
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