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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.