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mouse_x - Man Page

Global variable with the mouse position/button state. Allegro game programming library.


#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;


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)

Referenced By

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

The man pages mouse_b(3), mouse_pos(3), mouse_w(3), mouse_y(3) and mouse_z(3) are aliases of mouse_x(3).

version 4.4.3 Allegro manual