This is part of Family API which allow to create dual-os version of program runs under OS/2 and DOS

Note: This is legacy API call. It is recommended to use 32-bit equivalent

MouSetScaleFact

This call assigns to the current mouse device driver a new pair of 1-word scaling factors.

Syntax

MouSetScaleFact (ScaleStruct, DeviceHandle)

Parameters

ScaleStruct (PSCALEFACT) - input : Address of the control block structure that contains the current row and column coordinate scaling factors.

DeviceHandle (HMOU) - input : Handle of the mouse device from a previous MouOpen.

Return Code

rc (USHORT) - return:Return code descriptions are:

0 NO_ERROR

385 ERROR_MOUSE_NO_DEVICE

387 ERROR_MOUSE_INV_PARMS

466 ERROR_MOU_DETACHED

501 ERROR_MOUSE_NO_CONSOLE

505 ERROR_MOU_EXTENDED_SG

Remarks

MouSetScaleFact sets the mickey-to-pixel ratio for mouse motion. The row scale and column scale ratios specify a number of mickeys for each 8 pixels. The default value for the row scale is 16 mickeys for each 8 pixels. The default value for the column scale is 8 mickeys to 8 pixels.

The number of pixels moved does not have to correspond 1-to-1 with the number of mickeys the mouse moves. The scaling factor defines a sensitivity for the mouse that is a ratio of the number of mickeys required to move the cursor 8 pixels on the screen. The sensitivity determines at what rate the cursor moves on the screen.

Bindings

C

typedef struct _SCALEFACT { /* mousc */ USHORT rowScale; /* row scaling factor */ USHORT colScale; /* column coordinate scaling factor */ } SCALEFACT; #define INCL_MOU USHORT rc = MouSetScaleFact(ScaleStruct, DeviceHandle); PSCALEFACT ScaleStruct; /* 2-word structure */ HMOU DeviceHandle; /* Mouse device handle */ USHORT rc; /* return code */

MASM

SCALEFACT struc mousc_rowScale dw ? ;row scaling factor mousc_colScale dw ? ;column coordinate scaling factor SCALEFACT ends EXTRN MouSetScaleFact:FAR INCL_MOU EQU 1 PUSH@ OTHER ScaleStruct ;2-word structure PUSH WORD DeviceHandle ;Mouse device handle CALL MouSetScaleFact Returns WORD