---

inputDeviceJoystick.cpp

Go to the documentation of this file.

/********************************************************************
Description: joystick plug-in
part of the 3Dsia project
created: StonedBones, 26.2.2000

History:
    date,   name,       changes,                    in funtion
    260200  StonedBones created source

********************************************************************/



#include "inputDeviceJoystick.h"

#include <unistd.h>
#include <stdio.h>
#include <linux/joystick.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>

int joyHandle;
bool    isPresent;
struct js_event jsEvent;
int intAxes;
int intButtons;
long    intAxis[MAXAXES];
long    maxAxis[MAXAXES];
bool    intButton[MAXBUTTONS];
string  intName;

/*...................................................................
Description: returns the actual plugin
Args: <none>
Returns: plug-in pointer
Created: StonedBones, 26.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

extern "C" {DevicePlugIn* GetDevicePlugIn (void); };

DevicePlugIn* GetDevicePlugIn () {
    return &inputPlugIn;
};

/*...................................................................
Description: opens a joystick device
Args: char* device: device-filename
Returns: true on succes
Created: StonedBones, 26.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

bool openDevice () {
    for (int i = 1; i <= MAXAXES; i++) {
    intAxis[i]=0;
    maxAxis[i]=1;
    };
    
    joyHandle = open ("/dev/js0", O_RDONLY | O_NONBLOCK);
    
    if (joyHandle) {
    isPresent = true;
    } else {
    isPresent = false;
    return false;
    };
    
    char tmp[128];
    
    ioctl (joyHandle, JSIOCGAXES, &intAxes);
    ioctl (joyHandle, JSIOCGBUTTONS, &intButtons);
    ioctl (joyHandle, JSIOCGNAME(128), tmp);
    
    intName.assign (tmp);

    for (int i=0; i < intAxes; i++) {
    intAxis[i]=0;
    };
    for (int i=0; i < intButtons; i++) {
    intButton[i]=false;
    };
    
    update ();
    return true;
};

/*...................................................................
Description: closes device if open
Args: <none>
Returns: <none>
Created: StonedBones, 26.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

void closeDevice () {
    close (joyHandle);
    return;
};

/*...................................................................
Description: updates axis(int nr) and buttonPressed (int nr)
Args:  <none>
Returns: true on success
Created: StonedBones, 26.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

bool update () {
    if (isPresent) {

    read (joyHandle, &jsEvent, sizeof (struct js_event));
    
        switch (jsEvent.type) {
        case 1 : {  if (jsEvent.value == 1) {
                intButton[jsEvent.number]=true;
            } else {
                intButton[jsEvent.number]=false;
            };
            break;
             };
        case 2 : {  intAxis[jsEvent.number] = jsEvent.value;
            break;
             };
        case 129:
        case 130:   break;
        default: {  printf ("unhandled InputDeviceJoystick event: type=%i, number=%i, value=%i\n", jsEvent.type, jsEvent.number, jsEvent.value);
            break;
             };
    };
    return true;
    } else return false;
};

/*...................................................................
Description: returns the joystick name (given by kernel-module)
Args: <none>
Returns: NULL if no joystick was opened
Created: StonedBones, 26.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

string name () {
    if (isPresent) {
    return intName;
    } else return "none found";
};

/*...................................................................
Description: returns the amount of axes
Args: <none>
Returns: 0 if no joystick present
Created: StonedBones, 26.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

int axes () {
    if (isPresent) {
    return intAxes;
    } else return 0;
};

/*...................................................................
Description: returns the amount of buttons
Args: <none>
Returns: 0 if no joystick present
Created: StonedBones, 26.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

int buttons () {
    if (isPresent) {
    return intButtons;
    } else return 0;
};

/*...................................................................
Description: returns the value of axis 'nr'
Args: int nr: axis-number
Returns: axis-value
Created: StonedBones, 26.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

long axis (int nr) {
    if (isPresent) {
    if (nr < intAxes) {
        return (intAxis[nr]);
    } else {
        return 0;
    };
    } else {
    return 0;
    };
};

/*...................................................................
Description: returns if a certain button is pressed
Args: int nr: button-number
Returns: true if pressed
Created: StonedBones, 26.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

bool buttonPressed (int nr) {
    if (isPresent) {
    if (nr < intButtons) {
        return intButton[nr];
    } else {
        return false;
    };
    } else {
    return false;
    };
};

---