BOOL ScaleWindowExtEx(hdc, Xnum, Xdenom, Ynum, Ydenom, lpSize) | |||||
HDC hdc; | /* handle of device context | */ | |||
int Xnum; | /* horizontal multiplicand | */ | |||
int Xdenom; | /* horizontal divisor | */ | |||
int Ynum; | /* vertical multiplicand | */ | |||
int Ydenom; | /* vertical divisor | */ | |||
LPSIZE lpSize; | /* address of previous window extents | */ |
The ScaleViewportExtEx function modifies the window for the given device context using the ratios formed by the given multiplicands and divisors.
hdc
Identifies the device context.
Xnum
Specifies the amount by which to multiply the current horizontal extent.
Xdenom
Specifies the amount by which to divide the current horizontal extent.
Ynum
Specifies the amount by which to multiply the current vertical extent.
Ydenom
Specifies the amount by which to divide the current vertical extent.
lpSize
Points to a SIZE structure. The previous window extents (in logical units) are placed in this structure. If lpSize is NULL, nothing is returned. The SIZE structure has the following format:
typedef struct tagSIZE { /* siz */
LONG cx;
LONG cy;
} SIZE;
The return value is TRUE if the function is successful. Otherwise, it is FALSE.
The window extents are modified as shown:
xNewWE = (xOldWE * Xnum) / Xdenom
yNewWE = (yOldWE * Ynum) / Ydenom
GetWindowExtEx, SIZE