mouse_x(3)                      Allegro manual                      mouse_x(3)



NAME
       mouse_x, mouse_y, mouse_z, mouse_w, mouse_b, mouse_pos - Global
       variable with the mouse position/button state. Allegro game programming
       library.

SYNOPSIS
       #include <allegro.h>


       extern volatile int mouse_x;

       extern volatile int mouse_y;

       extern volatile int mouse_z;

       extern volatile int mouse_w;

       extern volatile int mouse_b;

       extern volatile int mouse_pos;

DESCRIPTION
       Global variables containing the current mouse position and button
       state.  Wherever possible these values will be updated asynchronously,
       but if mouse_needs_poll() returns TRUE, you must manually call
       poll_mouse() to update them with the current input state. The `mouse_x'
       and `mouse_y' positions are integers ranging from zero to the bottom
       right corner of the screen. The `mouse_z' and `mouse_w' variables hold
       the current vertical and horizontal wheel position, when using an input
       driver that supports wheel mice. The `mouse_b' variable is a bitfield
       indicating the state of each button: bit 0 is the left button,  bit 1
       the right, and bit 2 the middle button. Additional non standard mouse
       buttons might be available as higher bits in this variable. Usage
       example:

          if (mouse_b & 1)
             printf("Left button is pressed\n");

          if (!(mouse_b & 2))
             printf("Right button is not pressed\n");

       The `mouse_pos' variable has the current X coordinate in the upper 16
       bits and  the Y in the lower 16 bits. This may be useful in tight
       polling loops where a mouse interrupt could occur between your reading
       of the two separate variables, since you can copy this value into a
       local variable with a single instruction and then split it up at your
       leisure. Example:

          int pos, x, y;

          pos = mouse_pos;
          x = pos >> 16;
          y = pos & 0x0000ffff;




SEE ALSO
       install_mouse(3), poll_mouse(3), mouse_needs_poll(3), exalpha(3),
       exlights(3), exmouse(3), exshade(3), exspline(3), extrans(3)



Allegro                          version 4.2.3                      mouse_x(3)
