MouSetScaleFact

Bindings: C, MASM

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

MouSetScaleFact (ScaleStruct, DeviceHandle)

ScaleStruct (PSCALEFACT) - input Address of the control block structure that contains the current row and column coordinate scaling factors. The scaling factors must be greater than or equal to 1 and less than or equal to (32K - 1).

rowscale (USHORT) Row scaling factor.

colscale (USHORT) Column scaling factor.

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

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.