#include "BIDISP.H"
VOID CALLBACK M_CalcRect( int X,
int Y,
LPRECT lpScale,
LPRECT lpOut)
Description
This function should be called in response to the WM_MOUSEMOVE message or whenever one wants to update the magnifying window. This function calling sequence should be:
1, M_CalcRect() calculate area of bitmap to be displayed.
2, M_StretchBitmap() stretch the bitmap into a background bitmap.
3, M_CopyBitmap() copy the bitmap into a magnifying window.
Having three separate function calls for displaying the magnified bitmap will enable us to build custom and more elaborate magnifying windows in the future.
Parameters
|
int |
X |
The magnifying window top left X coordinate in screen coordinate. |
|
int |
Y |
The magnifying window top left Y coordinate in screen coordinate. |
|
LPRECT |
lpScale |
Scaling factor for magnification. For more details on how scaling is computed, see DisplayDIBStart(). |
|
LPRECT |
lpOut |
The newly calculated bitmap area. Use this output value as width and height in M_StretchBitmap() function. |
Return values
None.
Requirements
Header : Declared in BIDisp.h; include BIDisp.h.
Library : Use BIDisp.lib.
DLLs : BIDisp.dll.