MouSetScaleFact

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:
• 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.

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