JoyStick（PS5）の左ジョイスティックをマウスカーソルと連動させる練習用プログラム

joy2cursor.cpp

#include <iostream>
#include <fcntl.h>
#include <unistd.h>

#include <X11/Xlib.h>
// #include <X11/Xutil.h>

#include <linux/joystick.h>

#define JOY_DEV "/dev/input/js0"

int open_joy()
{
    int fd = open(JOY_DEV, O_RDONLY);
    if (fd < 0)
    {
        perror("error opening joystick");
        exit(1);
    }
    return fd;
}

long int map(int value, int min, int max, int min_out, int max_out)
{
    return (value - min) * (max_out - min_out) / (max - min) + min_out;
}

int main(void)
{
    struct js_event e;
    int raw_joy_x, raw_joy_y;
    int raw_joy_x_buf, raw_joy_y_buf = 0;
    int cursor_x, cursor_y;
    int joy_x, joy_y;
    int height, width;

    Display *display = XOpenDisplay(NULL);
    XEvent event = {0x00};
    int scr = XDefaultScreen(display);
    Window root_window = XRootWindow(display, scr);

    height = DisplayHeight(display, scr);
    width = DisplayWidth(display, scr);
    std::cout << "width: " << width << " height: " << height << std::endl;

    int fd = open_joy();

    while (read(fd, &e, sizeof(e)) > 0)
    {
        if (e.type & JS_EVENT_AXIS)
        {
            if (e.number == 0)
            {
                raw_joy_x = e.value;
                raw_joy_x_buf = raw_joy_x;
            }
            else if (e.number == 1)
            {
                raw_joy_y = e.value;
                raw_joy_y_buf = raw_joy_y;
            }
        }
        // not working ... :(
        // if (e.type & JS_EVENT_BUTTON)
        // {
        //     // cross button -> click pointer
        //     if (e.value == 1)
        //     {
        //         event.type = ButtonPress;
        //         event.xbutton.button = 1;

        //         XSendEvent(display, root_window, True, 0xfff, &event);
        //         // XFlush(display);
        //         usleep(100);
        //         std::cout << "click" << std::endl;
        //         // left click
        //         event.type = ButtonRelease;
        //         event.xbutton.state = 0x100;
        //         XSendEvent(display, root_window, True, 0xfff, &event);
        //         // XFlush(display);

        //     }
        // }

        std::cout << "raw_x: " << raw_joy_x << " raw_y: " << raw_joy_y << std::endl;
        joy_x = map(raw_joy_x, -32767, 32767, -100, 100);
        joy_y = map(raw_joy_y, -32767, 32767, -100, 100);

        if (abs(joy_x) > 10)
            cursor_x += (int)joy_x / 10;
        if (abs(joy_y) > 10)
            cursor_y += (int)joy_y / 10;

        // max=display_width
        if (cursor_x > width)   cursor_x = width;
        if (cursor_x < 0)       cursor_x = 0;
        if (cursor_y > height)  cursor_y = height;
        if (cursor_y < 0)       cursor_y = 0;

        std::cout << "joy_x: " << joy_x << " joy_y: " << joy_y << " cursor_x: " << cursor_x << " cursor_y: " << cursor_y << std::endl;

        XWarpPointer(display, None, root_window, 0, 0, 0, 0, cursor_x, cursor_y);
        XFlush(display);
        // usleep(100);
    }
    return 0;
}
// g++ joy2cursor.cpp -o joy2cursor -lX11