prj/tech/winsrc/input/mousevel.h

   1 #ifndef _MOUSEVEL_H
   2 #define _MOUSEVEL_H
   3
   4 #ifdef __cplusplus
   5 extern "C"  {
   6 #endif  // cplusplus
   7
   8 /*
   9  * $Source: x:/prj/tech/libsrc/input/RCS/mousevel.h $
  10  * $Revision: 1.2 $
  11  * $Author: DAVET $
  12  * $Date: 1996/01/25 14:20:42 $
  13  *
  14  */
  15
  16 // --------------------------------------------------------------
  17 //                MOUSE-LIBRARY SUPPORT FOR MOUSE
  18 //              EMULATION BY VELOCITY-BASED DEVICES
  19 // --------------------------------------------------------------
  20
  21
  22
  23
  24 /* ------------------------------------------------------
  25    These routines allow the client to set a _velocity_ for the mouse
  26    pointer.   The mouse pointer will move at the specified velicity
  27    whenever the mouse's current position is queried.   (Queries include
  28    mouse_get_xy (always) and queue checks (when the queue is empty).)
  29    Mouse velocity is specified in units of pixels per MOUSE_VEL_UNIT ticks,
  30    where ticks are the unit of the mouse library timestamp register.
  31    These routines are intended for use in emulating the mouse with other
  32    non-positional devices.  (keyboard, joystick, cyberbat, etc.)
  33    ------------------------------------------------------ */
  34
  35
  36 #define MOUSE_VEL_UNIT_SHF 16
  37 #define MOUSE_VEL_UNIT (1 << MOUSE_VEL_UNIT_SHF)
  38
  39
  40 errtype mouse_set_velocity_range(int xl, int yl, int xh, int yh);
  41 // Specifies the range of the mouse pointer velocity.
  42 // (xl,yl) is the low end of the range, whereas (xh,yh)
  43 // is the high end.  For most applications xl and xh will have the same
  44 // absolute value, as with yl and yh.
  45
  46 errtype mouse_set_velocity(int x, int y);
  47 // Sets the velocity of the mouse pointer,
  48 // in units of pixels per MOUSE_VEL_UNIT ticks.
  49
  50 errtype mouse_add_velocity(int x, int y);
  51 // Adds x and y to the mouse pointer velocity, constraining it
  52 // to remain withing the range specified by mouse_set_velocity_range()
  53
  54 errtype mouse_get_velocity(int *x, int *y);
  55 // Gets the current value of the mouse pointer velocity, as
  56 // set by mouse_set_velocity and mouse_add_velocity.
  57
  58
  59 #ifdef __cplusplus
  60 }
  61 #endif  // cplusplus
  62
  63 #endif // _MOUSEVEL_H