L_BM_FOCUSEDZOOM

Send this message to zoom in or zoom out, with the ability to center the display at the current mouse position.

Before sending the L_BM_FOCUSEDZOOM message, your program must declare a LEADBITMAPFOCUSEDZOOM structure and update its required fields. The following table describes the fields in the structure, using MyZoom as the name of the LEADBITMAPFOCUSEDZOOM structure. )

Sample Field Name	Data Type	Description
MyZoom.uStructSize	L_UINT	Size of the LEADBITMAPFOCUSEDZOOM structure. This field allows for compatibility with future enhancements. It can be specified as follows: MyZoom.uStructSize = sizeof(MyZoom);
MyZoom.Factor	L_UINT	The percentage scale factor. A value of 100 means no zooming.
MyZoom.Center	L_BOOL	TRUE for centering on the current mouse position, or FALSE for maintaining the current display offsets.
MyZoom.XFocus	L_INT	The horizontal mouse coordinate.
MyZoom.YFocus	L_INT	The vertical mouse coordinate.

Parameter	Meaning
wParam	Specifies whether the window should be redrawn to reflect the image changes. Use 1 to redraw the window, or 0 not to redraw it.
lParam	Points to the LEADBITMAPFOCUSEDZOOM structure that specifies the zoom information.

SUCCESS	Function was successful.
< 0	An error occurred. Refer to Return Codes.